R1230D R1230D001G/H 001G/H LQH3C100K54 ECSTOJX106R C3216JB0J106M R1230D181E - Datasheet Archive

 

PWM/VFM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER R1230D SERIES OUTLINE The R1230D Series are CMOS-based PWM step-down

 

R1230D R1230D_E.doc/2003/12/03 PWM/VFM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER R1230D R1230D SERIES OUTLINE The R1230D R1230D Series are CMOS-based PWM step-down DC/DC Converters with synchronous rectifier, low supply current. Each of these ICs consists of an oscillator, a PWM control circuit, a reference voltage unit, an error amplifier, a soft-start circuit, protection circuits, a protection against miss operation under low voltage (UVLO), PWM/VFM alternative circuit, a chip enable circuit, and a driver transistor. A low ripple, high efficiency step-down DC/DC converter can be easily composed of this IC with only a few kinds of external components, or an inductor and capacitors. (As for R1230D001G/H R1230D001G/H types, divider resistors are also necessary.) In terms of Output Voltage, it is fixed internally in the R1230Dxx1E/F types. While in the R1230D001G/H R1230D001G/H types, Output Voltage is adjustable with external divider resistors. PWM/VFM alternative circuit is active with Mode Pin of the R1230D R1230D Series. Thus, when the load current is small, the operation can be switching into the VFM operation from PWM operation by the logic of MODE pin and the efficiency at small load current can be improved. As protection circuits, Current Limit circuit which limits peak current of Lx at each clock cycle, and Latch type protection circuit which works if the term of Over-current condition keeps on a certain time in PWM mode exist. Latch-type protection circuit works to latch an internal driver with keeping it disable. To release the condition of protection, after disable this IC with a chip enable circuit, enable it again, or restart this IC with power-on or make the supply voltage at UVLO detector threshold level or lower than UVLO. FEATURES · Built-in Driver ON Resistance . P-channel 0.35, N-channel 0.45 (at VIN=3V) · Built-in Soft-start Function (Typ. 1.5ms), and Latch-type Protection Function (Delay Time; Typ. 1.5ms) · Two choices of Oscillator Frequency. 500kHz, 800kHz · PWM/VFM alternative with MODE pin . PWM operation; MODE pin at "L", VFM operation; MODE pin at "H" · High Efficiency . Typ. 90% · Output Voltage . Stepwise Setting with a step of 0.1V in the range of 1.2V ~ 3.3V (xx1E/F Type) or adjustable in the range of 0.8V to VIN (001G/H 001G/H Type) · High Accuracy Output Voltage . ±2.0% (xx1E/F Type) · Package. SON8 (Max height 0.9mm, thin type) 1 R1230D R1230D APPLICATIONS · Power source for portable equipment. BLOCK DIAGRAM · R1230Dxx1E/F 3 VDD MODE 6 "L" PWM "H" VFM VIN 1 OSC PWM/VFM CONTROL LX VOUT Phase Compensation + OUTPUT CONTROL 8 5 Vref + Current Protection UVLO CE Soft Start "H" Active Chip Enable 2 CE 7 PGND 4 AGND · R1230D001G/H R1230D001G/H 3 VDD 6 MODE "L" PWM "H" VFM VIN 1 OSC PWM/VFM CONTROL OUTPUT CONTROL 8 VFB Phase Compensation + LX 5 + Vref Current Protection UVLO Soft Start Chip Enable 2 2 7 PGND AGND "H" Active 4 CE R1230D R1230D SELECTION GUIDE In the R1230D R1230D Series, the output voltage, the oscillator frequency, and the taping type for the ICs can be selected at the user's request. The selection can be made with designating the part number as shown below; R1230Dxxxx-xx Part Number a bc d Code Contents Setting Output Voltage(VOUT): a Stepwise setting with a step of 0.1V in the range of 1.2V to 3.3V is possible for E/F version. "00" is for Output Voltage Adjustable G/H version (0.8V ~ ) b 1 : fixed Designation of Optional Function E : 500kHz, Fixed Output Voltage c F : 800kHz, Fixed Output Voltage G : 500kHz, Adjustable Output Voltage H : 800kHz, Adjustable Output Voltage d Designation of Taping Type; (Refer to Taping Specification) "TR" is prescribed as a standard. PIN CONFIGURATION SON-8 8 7 6 5 1 2 3 4 3 R1230D R1230D PIN DESCRIPTION Pin No. Symbol Description 1 VIN 2 PGND 3 VDD Voltage Supply Pin 4 CE Chip Enable Pin (active with "H") 5 VOUT/VFB 6 MODE Mode changer Pin (PWM mode at "L", VFM mode at "H".) 7 AGND Ground Pin 8 LX Voltage Supply Pin Ground Pin Output/Feedback Pin LX Pin ABSOLUTE MAXIMUM RATINGS AGND=PGND=0V Symbol Item Rating Unit VIN VIN Supply Voltage 6.5 V VDD VDD Pin Voltage 6.5 V VLX LX Pin Voltage -0.3 ~ VIN +0.3 V VCE CE Pin Input Voltage -0.3 ~ VIN +0.3 V MODE Pin Input Voltage -0.3 ~ VIN +0.3 V VFB VFB Pin Input Voltage -0.3 ~ VIN +0.3 V ILX LX Pin Output Current -0.8 A PD Power Dissipation 250 mW -40 ~ +85 °C -55 ~ +125 °C VMODE Topt Tstg 4 Operating Temperature Range Storage Temperature Range R1230D R1230D ELECTRICAL CHARACTERISTICS · R1230Dxx1E/F Topt=25°C Symbol VIN VOUT VOUT/ T Item Conditions Operating Input Voltage Step-down Output Voltage Step-down Output Voltage Temperature Coefficient Min. Typ. VIN=VCE=VSET+1.5V, Typ.× VMODE=0V, IOUT=10mA 0.980 -40°C Topt 85°C VSET Unit 5.5 2.4 Max. V Typ.× 1.020 V ppm/ ±150 °C fosc Oscillator Frequency (xx1E) VIN=VCE=VSET+1.5V 425 500 575 kHz fosc Oscillator Frequency (xx1F) VIN=VCE=VSET+1.5V 680 800 920 kHz 230 350 µA 250 400 µA 0 5 µA IDD Supply Current (xx1E) IDD Supply Current (xx1F) Istb Standby Current RONP RONN ILXleak IVOUT ICE ON Resistance of Pch Transistor ON Resistance of Nch Transistor LX Leakage Current VOUT Leakage Current CE Input Current VIN=VCE=VSET+1.5V, VOUT=VMODE=0V VIN=VCE=VSET+1.5V, VOUT=VMODE=0V VIN=5.5V, VCE=VOUT=0V VIN=5.0V 0.20 0.35 0.60 VIN=5.0V 0.20 0.45 0.70 -0.1 0.0 0.1 µA -0.1 0.0 0.1 µA -0.1 0.0 0.1 µA VIN=5.5V, VCE=0V, VLX=0V/5.5V VIN=5.5V, VCE=0V, VLX=0V/5.5V VIN=5.5V, VMODE=0V, VCE=5.5V/0V VCEH CE "H" Input Voltage VIN=5.5V, VOUT=0V VCEL CE "L" Input Voltage VIN=2.4V, VOUT=0V Maxdty VLX Oscillator Maximum Duty Cycle LX Limit Voltage 1.5 V 0.3 VMODE=0V 100 VMODE=VOUT=0V, VIN- VIN- VIN- VIN=VCE=3.0V 0.15 0.35 0.55 V % V 5 R1230D R1230D Topt=25°C Symbol Tstart Tprot Item Conditions Delay Time by Soft-Start at no load, function VIN=VCE=VSET+1.5V Delay Time for protection cir- VIN=VCE=VSET+1.5V, VMODE=0V cuit VIN=VCE=2.5V 1.5V, VUVLO1 UVLO Threshold Voltage VUVLO2 UVLO Released Voltage IMODE MODE Pin Input Current VMODEH MODE "H" Input Voltage VIN=VCE=5.5V, VOUT=0V VMODEL MODE "L" Input Voltage Min. Typ. Max. Unit 0.5 1.5 2.5 ms 0.5 1.5 2.5 ms 1.8 2.1 2.2 V 1.9 2.2 2.3 V 0.1 µA VIN=VCE=2.4V, VOUT=0V VFMdty VFM Duty Cycle VOUT=0V VIN=VCE=1. 5V 2.5V, VOUT=0V VIN=5.5V, VCE=0V, VMODE=5.5V/0V VIN=VCE= VMODE=2.4V, VOUT=0V -0.1 1.5 V 0.3 55 65 V 85 % · R1230D001G/H R1230D001G/H Topt=25°C Symbol Item VIN Operating Input Voltage VFB Feedback Voltage VFB/ Feedback Voltage Conditions T Temperature Coefficient Min. Typ. VIN=VCE=VSET+1.5V, VMODE=0V, IOUT=10mA 0.776 -40°C Topt 85°C 0.800 Unit 5.5 2.4 Max. V 0.824 V ppm/ ±150 °C fosc Oscillator Frequency (xx1G) VIN=VCE=VSET+1.5V 425 500 575 kHz fosc Oscillator Frequency (xx1H) VIN=VCE=VSET+1.5V 680 800 920 kHz IDD Supply Current (xx1G) VIN=VCE=5.5V, VFB=VMODE=0V 230 300 µA IDD Supply Current (xx1H) VIN=VCE=5.5V, VFB=VMODE=0V 250 350 µA Istb Standby Current VIN=5.5V, VCE=VFB=0V 0 5 µA RONP RONN 6 ON Resistance of Pch Transistor ON Resistance of Nch Transistor VIN=5.0V 0.20 0.35 0.60 VIN=5.0V 0.20 0.45 0.70 R1230D R1230D Topt=25°C Symbol Item ILXleak LX Leakage Current IVFB VFB Leakage Current ICE CE Input Current Conditions VIN=5.5V, VCE=0V, VLX=0V/5.5V VIN=5.5V, VCE=0V, VFB=0V/5.5V VIN=5.5V, VMODE=0V, VCE=5.5V/0V VCEH CE "H" Input Voltage VIN=5.5V, VFB=0V VCEL CE "L" Input Voltage Min. Typ. Max. Unit -0.1 0.0 0.1 µA -0.1 0.0 0.1 µA -0.1 0.0 0.1 µA VIN=2.4V, VFB=0V maxdty VLX Tstart Tprot Oscillator Maximum Duty Cycle LX Limit Voltage 0.3 100 VIN=VCE=3.0V, VMODE=0V, VIN- VIN- VIN- VFB=0V 0.15 0.35 0.55 0.5 1.5 2.5 at no load, function VIN=VCE=VSET+1.5V cuit V VMODE=0V Delay Time by Soft-Start Delay Time for protection cir- 1.5 VIN=VCE=3.6V, VMODE=0V VIN=VCE=2.5V 1.5V, VUVLO1 UVLO Threshold Voltage VUVLO2 UVLO Released Voltage IMODE MODE Pin Input Current VMODEH MODE "H" Input Voltage VIN=VCE=5.5V, VFB=0V VMODEL MODE "L" Input Voltage VFM Duty Cycle VIN=VCE=VMODE=2.4V, VFB=0V % 1.5 VFMdty VIN=VCE=1.5V 2.5V, VFB=0V VIN=5.5V, VMODE=5.5V/0V, VCE=0V V ms ms 1.8 2.1 2.2 V 1.9 2.2 2.3 V 0.1 µA VIN=VCE=2.4V, VFB=0V VFB=0V V -0.1 1.5 V 0.3 55 65 V 85 % 7 R1230D R1230D TEST CIRCUITS LX VIN VIN LX OSCILLOSCOPE VDD VDD CE CE VOUT VOUT AGND AGND A PGND MODE PGND MODE Test Circuit for Input Current and Leakage Current Test Circuit for Input Voltage and UVLO voltage OSCILLOSCOPE VIN VOUT LX L VDD CE 10µF VOUT AGND PGND MODE Test Circuit for Output Voltage, Oscillator Frequency, Soft-Starting Time OSCILLOSCOPE VIN A LX VIN LX VDD VDD CE CE A VOUT VOUT AGND AGND PGND MODE PGND MODE Test Circuit for Supply Current and Standby Current Test Circuit for ON resistance of LX, Limit Voltage, Delay Time of Protection Circuit The bypass capacitor between power supply and GND is a ceramic capacitor 10µF. 8 R1230D R1230D TYPICAL APPLICATION AND TECHNICAL NOTES 1) Fixed Output Voltage Type VOUT VIN LX L CIN PGND AGND LOAD VDD CE L MODE VOUT COUT : 10µH LQH3C100K54 LQH3C100K54 (Murata) COUT : 10µF ECSTOJX106R ECSTOJX106R (Panasonic) CIN : 10µF C3216JB0J106M C3216JB0J106M (TDK) VFM mode may work with a parasitic diode, but we recommend that VFM mode used with an external diode in between LX and GND. As for PWM mode, an external diode is not necessary. 2) Adjustable Output Voltage Type L VIN VOUT LX CIN PGND AGND LOAD Cb VDD CE MODE COUT VFB Rb L R1 R2 : 10µH LQH3C100K54 LQH3C100K54 (Murata) COUT : 10µF ECSTOJX106R ECSTOJX106R (Panasonic) CIN : 10µF C3216JB0J106M C3216JB0J106M (TDK) VFM mode may work with a parasitic diode, but we recommend that VFM mode used with an external diode in between LX and GND. As for PWM mode, an external diode is not necessary. As for how to choose Cb, Rb, R1, and R2 values, refer to the technical notes. 9 R1230D R1230D When you use these ICs, consider the following issues; · Input same voltage into the power supply pins, VIN and VDD. Set the same level as AGND and PGND. · When you control the CE pin and MODE pin by another power supply, do not make its "H" level more than the voltage level of VIN / VDD pin. · Set external components such as an inductor, CIN, COUT as close as possible to the IC, in particular, minimize the wiring to VIN pin and PGND pin. · At stand by mode, (CE="L"), the LX output is Hi-Z, or both P-channel transistor and N-channel transistor of L X pin turn off. · Use an external capacitor COUT with a capacity of 10µF or more, and with good high frequency characteristics such as tantalum capacitors. · At VFM mode, (MODE="H"), Latch protection circuit does not operate. · If the mode is switched over into PWM mode from VFM mode during the operation, change the mode at light load current. If the load current us large, output voltage may decline. · Reinforce the VIN, PGND, and VOUT lines sufficiently. Large switching current may flow in these lines. If the impedance of VIN and PGND lines is too large, the internal voltage level in this IC may shift caused by the switching current, and the operation might be unstable. The performance of power source circuits using these ICs extremely depends upon the peripheral circuits. Pay attention in the selection of the peripheral circuits. In particular, design the peripheral circuits in a way that the values such as voltage, current, and power of each component, PCB patterns and the IC do not exceed their respected rated values. 10 R1230D R1230D OPERATION of step-down DC/DC converter and Output Current The step-down DC/DC converter charges energy in the inductor when LX transistor is ON, and discharges the energy from the inductor when LX transistor is OFF and controls with less energy loss, so that a lower output voltage than the input voltage is obtained. The operation will be explained with reference to the following diagrams: IL i1 ILmax ILmin topen IOUT Pch Tr L VOUT VIN i2 Nch Tr CL ton toff T=1/fosc Step 1: P-channel Tr. turns on and current IL (=i1) flows, and energy is charged into CL. At this moment, IL increases from Ilmin (=0) to reach ILmax in proportion to the on-time period (ton) of P-channel Tr. Step 2: When P-channel Tr. turns off, Synchronous rectifier N-channel Tr. turns on in order that L maintains IL at ILmax, and current IL (=i2) flows. Step 3: IL (=i2) decreases gradually and reaches IL=ILmin=0 after a time period of topen, and N-channel Tr. Turns off. Provided that in the continuous mode, next cycle starts before IL becomes to 0 because toff time is not enough. In this case, IL value increases from this Ilmin (>0). In the case of PWM control system, the output voltage is maintained by controlling the on-time period (ton), with the oscillator frequency (fosc) being maintained constant. · Discontinuous Conduction Mode and Continuous Conduction Mode The maximum value (ILmax) and the minimum value (ILmin) of the current flowing through the inductor are the same as those when P-channel Tr. turns on and off. The difference between ILmax and ILmin, which is represented by I; I = ILmax - ILmin = VOUT × topen / L = (VIN - VOUT) × ton / L . Equation 1 Wherein T = 1 / fosc = ton + toff duty (%) = ton / T × 100 = ton × fosc × 100 topen toff In Equation 1, VOUT × topen/L and (VIN - VOUT) × ton/L respectively show the change of the current at "ON", and the change of the current at "OFF". 11 R1230D R1230D When the output current (IOUT) is relatively small, topen < toff as illustrated in the above diagram. In this case, the energy is charged in the inductor during the time period of ton and is discharged in its entirely during the time period of toff, therefore ILmin becomes to zero (ILmin = 0). When IOUT is gradually increased, eventually, topen becomes to toff (topen = toff), and when IOUT is further increased, ILmin becomes larger than zero (ILmin > 0). The former mode is referred to as the discontinuous mode and the latter mode is referred to as continuous mode. In the continuous mode, when Equation 1 is solved for ton and assumed that the solution is tonc, tonc = T × VIN / VOUT .Equation 2 When ton < tonc, the mode is the discontinuous mode, and when ton = tonc, the mode is the continuous mode. OUTPUT CURRENT AND SELECTION OF EXTERNAL COMPONENTS When P-channel Tr. of LX is ON: (Wherein, Ripple Current P-P value is described as IRP, ON resistance of P-channel Tr. and N-channel Tr. of LX are respectively described as Ronp and Ronn, and the DC resistor of the inductor is described as RL.) VIN = VOUT + (Ronp + RL) × IOUT + L × IRP / ton. Equation 3 When P-channel Tr. of LX is "OFF"(N-channel Tr. is "ON"): L × IRP / toff = RL × IOUT + VOUT + Ronn × IOUT. Equation 4 Put Equation 4 to Equation 3 and solve for ON duty of P-channel transistor, ton / (toff + ton) = DON, DON = (VOUT ­ Ronn × IOUT + RL × IOUT) / (VIN + Ronn × IOUT ­ Ronp × IOUT) .Equation 5 Ripple Current is as follows; IRP = (VIN ­ VOUT ­ Ronp × IOUT ­ RL × IOUT) × DON / fosc / L. Equation 6 wherein, peak current that flows through L, and LX Tr. is as follows; ILmax = IOUT + IRP/2. Equation 7 Consider ILmax, condition of input and output and select external components. 5The above explanation is directed to the calculation in an ideal case in continuous mode. 12 R1230D R1230D How to Adjust Output Voltage and about Phase Compensation As for Adjustable Output type, feedback pin (VFB) voltage is controlled to maintain 0.8V. Output Voltage, VOUT is as following equation; VOUT: R1+R2 = VFB: R2 VOUT = VFB × (R1 + R2)/R2 Thus, with changing the value of R1 and R2, output voltage can be set in the specified range. In the DC/DC converter, with the load current and external components such as L and C, phase might be behind 180 degree. In this case, the phase margin of the system will be less and stability will be worse. To prevent this, phase margin should be secured with proceeding the phase. A pole is formed with external components L and COUT. Fpole ~ 1/2 LCOUT A zero (signal back to zero) is formed with R1 and Cb. Fzero ~ 1/(2×R1×Cb) First, choose the appropriate value of R1, R2 and Cb. Set R1+R2 value 100k or less. For example, if L = 10µH, COUT = 10µF, the cut off frequency of the pole is approximately 16kHz. To make the cut off frequency of the pole higher than 16kHz, set R1 = 42k and Cb = 100pF. If VOUT is set at 1.5V, R2 = 48k is appropriate. If a ceramic capacitor is desirable as COUT in your application, nonetheless of the usage of both the fixed output voltage type and adjustable output type, add 0.2 or more resistance to compensate the ESR. Further, if a ceramic capacitor is desirable to use as COUT without adding another resister to compensate the ESR, phase should be back drastically. To make it, R2 value should be smaller compared to R1. As a result, the set output voltage may be large. For example, to make VOUT = 1.5V, constants are R1 = 42k, R2 = 48k, and Cb = 100pF. If the ceramic capacitor is used, under the heavy load condition, oscillation may be result. On the other hand, if R2 = 12k and VOUT = 3.6V, phase back becomes also large, and even if the device is used with a heavy load, the operation will be stable. Rb is effective for reducing the noise on VFB, however, it is not always necessary. If it is necessary, use as much as 30k as Rb. 13 R1230D R1230D External Components 1. Inductor Select an inductor that peak current does not exceed ILmax. If larger current than allowable current flows, magnetic saturation occurs and make transform efficiency worse. Supposed that the load current is at the same, the smaller value of L is used, the larger the ripple current is. Provided that the allowable current is large in that case and DC current is small, therefore, for large output current, efficiency is better than using an inductor with a large value of L and vice versa. 2. Capacitor As for CIN, use a capacitor with low ESR (Equivalent Series Resistance) Ceramic type of a capacity at least 10µF for stable operation. COUT can reduce ripple of Output Voltage, therefore as much as 10µF tantalum type is recommended. 3. Diode If VFM mode is chosen at light load, use a Schottky diode with small VF. A diode with small VF makes the efficiency of the circuit improved. Small reverse direction current, IR is an important factor, however, VF has more important priority than IR. TIMING CHART Output Short Internal Opertional Internal Soft-start Amplifier Output Set Voltage CE pin Voltage Output Short Internal Oscillator Waveform Lx Pin Output Latched Soft-start Time Stable Delay Time of Protection The timing chart as shown above describes the waveforms starting from the IC is enabled with CE and latched with protection. During the soft-start time, until the level is rising up to the internal soft-start set voltage, the duty cycle of LX is gradually wider and wider to prevent the over-shoot of the voltage. During the term, the output of amplifier is "H", then after the output voltage reaches the set output voltage, they are balanced with the stable state. Herein, if the output pin would be short circuit, the output of amplifier would become "H" again, and the condition would continue for 1.5ms (Typ.), latch circuit would work and the output of LX would be latched with "OFF". (Output ="High-Z") If the output short is released before the latch circuit works (within 1.5ms after output shorted), the output of amplifier is balanced in the stable state again. Once the IC is latched, to release the protection, input "L" with CE pin, or make the supply voltage at UVLO level or less. 14 R1230D R1230D TYPICAL CHARACTERISTICS Output Voltage vs. Output Current R1230D181E R1230D181E Output Voltage(V) 1.9 1.85 1.8 VIN=3.3V PWM VIN=3.3V VFM VIN=5.0V PWM VIN=5.0V VFM 1.75 1.7 1 10 100 1000 Output Current(mA) R1230D181F R1230D181F Output Voltage(V) 1.9 1.85 1.8 VIN=3.3V PWM VIN=3.3V VFM VIN=5.0V PWM VIN=5.0V VFM 1.75 1.7 1 10 100 1000 100 1000 Output Current(mA) R1230D331F R1230D331F 3.4 Output Voltage(V) 1) 3.35 3.3 VIN=5.0V PWM VIN=5.0V VFM 3.25 3.2 1 10 Output Current(mA) 15 R1230D R1230D 2) Efficiency vs. Output Current R1230D181E R1230D181E 100 Efficiency(%) 80 60 40 VIN=3.3V PWM VIN=3.3V VFM VIN=5.0V PWM VIN=5.0V VFM 20 0 1 10 100 1000 Output Current(mA) R1230D181F R1230D181F 100 90 Efficiency(%) 80 70 60 50 40 VIN=3.3V PWM VIN=3.3V VFM VIN=5.0V PWM VIN=5.0V VFM 30 20 10 0 1 10 100 1000 Output Current(mA) R1230D331F R1230D331F 100 Efficiency(%) 80 60 40 VIN=5.0V PWM VIN=5.0V VFM 20 0 1 10 100 Output Current(mA) 16 1000 R1230D R1230D Ripple Voltage vs. Output Current R1230D181E R1230D181E Output Ripple Voltage Vripple(V) COUT=10µF Tantalum Capacitor ESR=400m PWM Mode VIN=5.0V, IOUT=200mA 0.06 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -1.00E-06 00E-06 0.00E+00 1.00E-06 00E-06 2.00E-06 00E-06 3.00E-06 00E-06 4.00E-06 00E-06 5.00E-06 00E-06 6.00E-06 00E-06 7.00E-06 00E-06 8.00E-06 00E-06 Time(sec) R1230D181F R1230D181F Output Ripple Voltage Vripple(V) COUT=10µF, Tantalum Capacitor, ESR=400m 80 70 VIN=5.0V 60 50 VIN=3.3V 40 30 20 10 0 0 50 100 150 200 250 300 350 400 450 500 Output Current IOUT(mA) R1230D181F R1230D181F COUT=10µF Ceramic Capacitor ESR=220m PWM Mode VIN=5.0V, IOUT=200mA Output Ripple Voltage Vripple(V) 3) 0.04 0.03 0.02 0.01 0 -0.01 -0.02 -0.03 -0.04 -1.00E-06 00E-06 0.00E+00 1.00E-06 00E-06 2.00E-06 00E-06 3.00E-06 00E-06 4.00E-06 00E-06 5.00E-06 00E-06 6.00E-06 00E-06 7.00E-06 00E-06 8.00E-06 00E-06 Time(sec) 17 R1230D R1230D 4) Output Waveform R1230D181F R1230D181F COUT=10µF Tantalum Capacitor ESR=400m PWM Mode VIN=5.0V, IOUT=10mA Output Ripple Voltage VAC(V) 0.05 0.04 0.03 0.02 0.01 0 -0.01 -0.02 -0.03 -0.04 -4.00E-06 00E-06 -3.00E-06 00E-06 -2.00E-06 00E-06 -1.00E-06 00E-06 0.00E+00 1.00E-06 00E-06 2.00E-06 00E-06 3.00E-06 00E-06 4.00E-06 00E-06 Time(sec) R1230D181F R1230D181F COUT=10µF Tantalum Capacitor ESR=400m PWM Mode VIN=5.0V, IOUT=100mA AC Output Voltage VAC(V) 0.04 0.03 0.02 0.01 0 -0.01 -0.02 -0.03 -0.04 -0.05 -0.06 -4.00E-06 00E-06 -3.00E-06 00E-06 -2.00E-06 00E-06 -1.00E-06 00E-06 0.00E+00 1.00E-06 00E-06 2.00E-06 00E-06 3.00E-06 00E-06 4.00E-06 00E-06 Time(sec) 5) Output Voltage vs. Input Voltage R1230D181F R1230D181F IOUT=20mA Output Voltage VOUT(V) 1.90 1.85 VFM 1.80 PWM 1.75 1.70 2 2.5 3 3.5 4 4.5 Input Voltage VIN(V) 18 5 5.5 6 R1230D R1230D 6) Output Voltage vs. Temperature R1230D181F R1230D181F IOUT=100mA 1.9 Output Voltage VOUT(V) 1.88 1.86 1.84 1.82 1.8 1.78 1.76 1.74 1.72 1.7 -60 -40 -20 0 20 40 60 80 100 Temperature Topt(°C) R1230D001G/H R1230D001G/H IOUT=100mA Output Voltage VOUT(V) 0.90 0.85 0.80 0.75 0.70 -60 -40 -20 0 20 40 60 80 100 Temperature Topt(°C) Oscillator Frequency vs. Temperature VIN=VOUT+1.5V 1000 900 Frequency fOSC(kHz) 7) 800 700 600 500 400 300 -60 -40 -20 0 20 40 60 80 100 Temperature Topt(°C) 19 R1230D R1230D 8) Supply Current vs. Temperature VIN=5.5V Supply Current ISS(µA) 450 380 310 800kHz 240 500kHz 170 100 -60 -40 -20 0 20 40 60 80 100 Temperature Topt(°C) 9) Soft-start time vs. Temperature R1230D181F R1230D181F VIN=3.3V Soft-start Time Tsoft(ms) 3.0 2.4 1.8 800kHz 1.2 500kHz 0.6 0 -60 -40 -20 0 20 40 60 80 100 60 80 100 Temperature Topt(°C) 10) Delay Time for protection vs. Temperature R1230D181F R1230D181F Delay Time for Protection Circuit Tpre(ms) 3.0 2.4 1.8 1.2 0.6 0 -60 -40 -20 0 20 40 Temperature Topt(°C) 20 R1230D R1230D 11) UVLO Threshold/Released Voltage vs. Temperature 2.3 UVLO Released Voltage VDD Voltage Level(V) 2.25 2.2 2.15 2.1 UVLO Detector Threshold 2.05 2 1.95 1.9 1.85 1.8 -60 -40 -20 0 20 40 60 80 100 Temperature Topt(°C) 12) CE Pin Input Voltage vs. Temperature 1.6 Input Voltage VCE(V) 1.4 1.2 1.0 CEH 0.8 CEL 0.6 0.4 0.2 0 -60 -40 -20 0 20 40 60 80 100 Temperature Topt(°C) 13) Mode Pin Input Voltage vs. Temperature 1.6 MODE Input Voltage VMODE(V) 1.4 1.2 1.0 MODEH 0.8 MODEL 0.6 0.4 0.2 0 -60 -40 -20 0 20 40 60 80 100 Temperature Topt(°C) 21 R1230D R1230D 14) Duty Cycle at VFM Mode vs. Temperature Duty Cycle at VFM Mode(%) 80 75 70 65 60 55 50 -60 -40 -20 0 20 40 60 80 100 Temperature Topt(°C) 15) Lx Transistor on Resistance vs. Temperature VIN=3.0V ON Resistance Ron() 1.00 0.75 NchTr. On Resistance 0.50 0.25 PchTr. On Resistance 0 -60 -40 -20 0 20 40 60 80 100 60 80 100 Temperature Topt(°C) 16) Limit Voltage vs. Temperature 0.50 Limit Voltage Vlimit(V) 0.45 0.40 0.35 0.30 0.25 0.20 0.15 0.10 -60 -40 -20 0 20 40 Temperature Topt(°C) 22 R1230D R1230D 17) Load Transient Response R1230D181F R1230D181F VIN=5.0V PWM 0.5 0.4 IOUT=0A 0.3 0.2 0.1 0 -0.1 -0.2 AC Output Voltage VAC(V) Load Current 100mA/div 0.6 IOUT=100mA -0.3 -4.00E-05 00E-05 -2.00E-05 00E-05 0.00E+00 2.00E-05 00E-05 4.00E-05 00E-05 6.00E-05 00E-05 8.00E-05 00E-05 1.00E-04 00E-04 1.20E-04 20E-04 1.40E-04 40E-04 Time(sec) R1230D181F R1230D181F VIN=5.0V PWM 0.6 0.5 0.4 IOUT=0A 0.3 0.2 0.1 0 -0.1 Output Voltage VAC(V) Load Current 100mA/div IOUT=200mA -0.2 -0.3 -4.00E-05 00E-05 -2.00E-05 00E-05 0.00E+00 2.00E-05 00E-05 4.00E-05 00E-05 6.00E-05 00E-05 8.00E-05 00E-05 1.00E-04 00E-04 1.20E-04 20E-04 1.40E-04 40E-04 Time(sec) R1230D181F R1230D181F VIN=5.0V PWM 0.5 IOUT=0A 0.4 0.3 0.2 0.1 0 -0.1 -0.2 AC Output Voltage VAC(V) Load Current 100mA/div 0.6 IOUT=100mA -0.3 -4.00E-06 00E-06 -1.00E-06 00E-06 6.00E-06 00E-06 1.10E-05 10E-05 1.60E-05 60E-05 2.10E-05 10E-05 2.60E-05 60E-05 3.10E-05 10E-05 3.60E-05 60E-05 Time(sec) 23 R1230D R1230D R1230D181F R1230D181F VIN=5.0V PWM IOUT=100mA 0.5 IOUT=2mA 0.4 0.3 0.2 0.1 0 -0.1 -0.2 AC Output Voltage VAC(V) Load Current 100mA/div 0.6 -0.3 -0.0002 -0.0001 0 0.0001 0.0002 0.0003 0.0004 0.0005 0.0006 0.0007 0.0008 Time(sec) R1230D181F R1230D181F VIN=5.0V PWM Load Current 100mA/div 0.5 0.4 IOUT=0A 0.3 0.2 0.1 0 -0.1 -0.2 AC Output Voltage VAC(V) 0.6 IOUT=200mA -0.3 -4.00E-06 00E-06 -1.00E-06 00E-06 6.00E-06 00E-06 1.10E-05 10E-05 1.60E-05 60E-05 2.10E-05 10E-05 2.60E-05 60E-05 3.10E-05 10E-05 3.60E-05 60E-05 Time(sec) R1230D181F R1230D181F VIN=5.0V PWM 0.5 IOUT=200mA IOUT=2mA 0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0.0002 -0.0001 0 -0.3 0.0001 0.0002 0.0003 0.0004 0.0005 0.0006 0.0007 0.0008 Time(sec) 24 AC Output Voltage VAC(V) Load Current 100mA/div 0.6 R1230D R1230D 18) Turn-on Waveform R1230D181F R1230D181F PWM Mode IOUT=0A VIN=5.0V 4 2 4 CE 0 3 -2 2 -4 VOUT 1 -6 0 -1 -0.0004 -8 CE Input Voltage VCE(V) Output Voltage VOUT(V) 5 -10 0 0.0004 0.0008 0.0012 0.0016 0.002 0.0024 0.0028 Time(sec) R1230D181F R1230D181F PWM Mode IOUT=50mA VIN=5.0V 4 2 4 CE 0 3 -2 2 VOUT 1 -6 0 -1 -0.0004 -4 -8 CE Input Voltage VCE(V) Output Voltage VOUT(V) 5 -10 0 0.0004 0.0008 0.0012 0.0016 0.002 0.0024 0.0028 Time(sec) R1230D181F R1230D181F PWM Mode IOUT=200mA VIN=5.0V 4 2 4 CE 0 3 -2 2 VOUT 1 -6 0 -1 -0.0004 -4 -8 CE Input Voltage VCE(V) Output Voltage VOUT(V) 5 -10 0 0.0004 0.0008 0.0012 0.0016 0.002 0.0024 0.0028 Time(sec) 25 R1230D R1230D R1230D181F R1230D181F VFM Mode IOUT=0A VIN=5.0V 4 2 4 CE 0 3 -2 2 -4 VOUT 1 -6 0 -1 -0.0004 -8 CE Input Voltage VCE(V) Output Voltage VOUT(V) 5 -10 0 0.0004 0.0008 0.0012 0.0016 0.002 0.0024 0.0028 Time(sec) R1230D181F R1230D181F VFM Mode IOUT=50mA VIN=5.0V 4 2 4 CE -2 2 -4 VOUT 1 -6 0 -1 -0.0004 -8 -10 0 0.0004 0.0008 0.0012 0.0016 Time(sec) 26 0 3 0.002 0.0024 0.0028 CE Input Voltage VCE(V) Output Voltage VOUT(V) 5