BIPOLAR Switching Regulator Controller Channels plus High-Pr

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BIPOLAR Switching Regulator Controller Channels plus High-Pr

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DS04-27208-1E
BIPOLAR
Switching Regulator Controller
Channels plus High-Precision, High-Frequency Capabilities)
MB3785A
DESCRIPTION
MB3785A PWM-based 4-channel switching regulator controller featuring high-precision, high-frequency capabilities. four channels circuits allow their outputs three modes: step-down, step-up, inverted. third fourth channels suited motor speed control. triangular-wave oscillation circuit accepts ceramic resonator, addition standard method oscillation using network.
FEATURES
Wide range operating power supply voltages: current consumption: [TYP] when operating10 less during standby Built-in high-precision reference voltage generator: 2.50 V±1% Oscillation circuit Capable high-frequency oscillation: Also accepts ceramic resonator. Wide input range error amplifier: -0.2 VCC-1.8 Built-in timer/latch-actuated short-circuiting detection circuit
(Continued)
PACKAGE
48-pin, Plastic LQFP
(FPT-48P-M05)
MB3785A
(Continued) Output circuit drive output transistors totem-pole type allowing on-current off-current values independently. Adjustable dead time over entire duty ratio range Built-in standby output control functions High-density mounting possible: 48-pin LQFP package
ASSIGNMENT
(TOP VIEW)
OUT1
OUT2
OUT3
VCC2
OUT4
DTC1 -IN1 +IN1 -IN1 DTC2 -IN2 +IN2
DTC4 -IN4 +IN4 -IN4 DTC3 -IN3 +IN3
-IN2
(FPT-48P-M05)
Each alphabet parentheses following symbol indicates input next circuit. denotes comparator. denotes error amplifier.
-IN3
CTL1
OSCIN
OSCOUT
CTL2
CTL3
VCC1
VREF
MB3785A
DESCRIPTION
Symbol +IN1(E) -IN1(E) -IN1(C) DTC1 OUT1 +IN2(E) -IN2(E) -IN2(C) DTC2 OUT2 +IN3(E) -IN3(E) -IN3(C) DTC3 OUT3 +IN4(E) -IN4(E) -IN4(C) Description output transistor OFF-current setting pin. Insert capacitor between pins, then output transistor OFF-current. error non-inverted input pin. error inverted input pin. error output pin. comparator inverted input pin. dead time control pin. output current setting pin. totem-pole output pin. output transistor OFF-current setting pin. Insert capacitor between pins, then output transistor OFF-current. error non-inverted input pin. error inverted input pin. error output pin. comparator inverted input pin. dead time control pin. output current setting pin. totem-pole output pin. output transistor OFF-current setting pin. Insert capacitor between pins, then output transistor OFF-current. error non-inverted input pin. error inverted input pin. error output pin. comparator inverted input pin. dead time control pin. output current setting pin. totem-pole output pin. output transistor OFF-current setting pin. Insert capacitor between pins, then output transistor OFF-current. error non-inverted input pin. error inverted input pin. error output pin. comparator inverted input pin.
(Continued)
MB3785A
(Continued)
Triangular-Wave Oscillator Circuit Symbol DTC4 OUT4 OSCIN OSCOUT VCC1 VCC2 VREF CTL1 This connects ceramic resonator. dead time control pin. output current setting pin. totem-pole output pin. Description
This connects resistor setting triangular-wave frequency. This connects capacitor setting triangular-wave frequency. Power supply reference power supply control circuit. Power supply output circuit. pin. Reference voltage output pin. This connects capacitor short-circuit protection circuit. Power supply circuit first-channel control pin. When this High, power supply circuit first channel active state. When this Low, power supply circuit first channel standby state.
Control Circuit
Power Supply Circuitt
CTL2
Second-channel control pin. While CTL1 High When this High, second channel active state. When this Low, second channel inactive state.
CTL3
Third fourth-channel control pin. While CTL1 High When this High, third fourth channels active state. When this Low, third fourth channels inactive state.
MB3785A
BLOCK DIAGRAM
Error
+IN1 -IN1 -IN1 DTC1
VREF
comparator
Comparator
VREF
Current Setting
VCC2
Comparator
OUT1
Error
+IN2 -IN2 -IN2 DTC2
VREF
comparator
Comparator
VREF
Current Setting
Comparator
OUT2
Error
+IN3 -IN3 -IN3 DTC3
Comparator
comparator
Current Setting
OUT3
Error
+IN4 -IN4 -IN4 DTC4
Comparator
comparator
Current Setting
OUT4
Comparator
CTL2 CTL3
Comparator
-1.9 -1.3
Ref. Power Supply Vol. Circuit Channel Circuit Control
VCC1 CTL1
VREF Latch
Under Voltage Lock-out Protection Circuit Triangular-Wave Oscillator Circuit
OSCIN
VREF
OSCOUT Ceramic Resonator
MB3785A
FUNCTIONAL DESCRIPTION
Switching Regulator Function
Reference voltage circuit reference voltage circuit generates temperature-compensated reference voltage 2.50 using voltage supplied from power supply terminal (pin 18). This voltage used operating power supply internal circuits reference voltage also supplied external device from VREF terminal (pin 19). Triangular-wave oscillator circuit connecting timing capacitor resistor (pin (pin terminals, possible generate desired triangular oscillation waveform. oscillation also obtained using ceramic resonator connected pins This waveform amplitude input internal comparator same time, also supplied external device from terminal (pin 17). Error amplifier This amplifier detects output voltage switching regulator outputs control signal accordingly. wide common-mode input voltage range from -0.2 -1.8 allows easy setting from external power supply, making system suitable motor speed control. connecting feedback resistor capacitor from error amplifier output inverted input pin, form desired loop gain, stable phase compensation. comparator comparators these channels voltage comparator with inverted input non-inverted input, that voltage-pulse width converter control output pulse on-time according input voltage. turns output transistor when triangular wave from oscillator higher than both error amplifier output DTC-pin voltages. comparators these channels voltage comparator with inverted input non-inverted inputs, that voltage-pulse width converter control output pulse on-time according input voltage. turns output transistor when triangular wave from oscillator lower than both error amplifier output DTC-pin voltages. These four channels provided with soft start function using pin. Output circuit output circuit comprised totem-pole configuration drive transistor max.)
MB3785A
Channel Control Function
MB3785A allows four channels power supply circuits controlled independently. voltage levels CTL1 (pin 20), CTL2 (pin 21), CTL3 (pin terminals turn circuit each channel "ON" "OFF", listed below. Table Channel Channel On/Off Setting Conditions. voltage level CTL1 CTL2 CTL3 Standby state* Power supply circuit On/Off state channel First channel Second channel channels
power supply current value during standby less.
Protective Functions
Timer/latch-actuated short-circuiting protection circuit comparator checks output voltage each comparator which used detect short-circuiting output. When these comparators have output voltage greater than equal timer circuit activated protection enable capacitor externally fitted terminal (pin begins charge. comparator's output voltage restored normal voltage level time capacitor voltage risen base-emitter junction voltage transistor, i.e., 0.65 latch circuit activated turn output transistor while same time setting duty (OFF) When actuated, this protection circuit reset turning power supply again. Under voltage lockout protection circuit transient state power-on momentary drop power supply voltage causes control malfunction, resulting system breakdown deterioration. detecting internal reference voltage with respect power supply voltage, this protection circuit resets latch circuit turn output transistor duty (OFF) while same time holding terminal (pin "L". reset cleared when power supply voltage becomes greater than equal threshold voltage level this protection circuit.
MB3785A
ABSOLUTE MAXIMUM RAGINGS (See WARNING)
+25°C) Parameter Power supply voltage Control input voltage Power dissipation Operating ambient temperature Storage temperature Symbol VICTL Tstg Conditions +25°C Rating 550* Unit
packages mounted epoxy board cm). WARNING: Permanent device damage occur above Absolute Maximum Ratings exceeded. Functional operation should restricted conditions detailed operational sections this data sheet. Exposure absolute maximum rating conditions extended periods affect device reliability.
RECOMMENDED OPERATING CONDITIONS
+25°C) Parameter Power supply voltage* Error amp. input voltage Comparator input voltage Control input voltage Output current Timing capacitance Timing resistance Oscillation frequency Operating ambient temperature Symbol VICTL fOSC Conditions Value Min. -0.2 -0.2 -0.2 Typ. Max. -0.8 1500 1000 Unit
minimum value recommended supply voltage except when device operates with constant output sink current.
MB3785A
ELECTRICAL CHARACTERISTICS
(VCC +25°C) Parameter Reference voltage Reference voltage block Rate changed output voltage Temperature Input stability Load stability Sort-circuit output current Under voltage lockout protection circuit (U.V.L.O) Threshold voltage Hysteresis width Reset voltage (VCC) Input threshold voltage Input bias current Input voltage range Input offset voltage Input bias current Common mode input voltage range Threshold voltage Input standby voltage Input latch voltage Input source current Oscillation frequency Frequency stability (VCC) Symbol VREF VREF /VREF Line Load VHYS VICM VtPC VSTB Ilbpc fOSC f/fdv f/fdT Conditions -30°C +85°C -0.1 VREF Value Min. 2.475 2.45 -200 -0.2 0.58 -200 -0.2 0.60 -1.4 Typ. 2.500 ±0.2 2.72 2.60 2.50 -100 0.65 -100 0.65 -1.0 Max. 2.525 2.55 0.72 VCC-1.8 0.70 -0.6 Unit
Short-circuit detection comparator Short circuit detection block
Triangular waveform oscillator block
CH/4
CH/2
Frequency stability (Ta)
-30°C +85°C
(Continued)
MB3785A
(Continued)
(VCC +25°C) Parameter Input offset voltage Error amplifier Input bias current Common mode input voltage range Voltage gain Frequency bandwidth CH/2 dead time control circuit Input threshold voltage Input bias current Latch mode source current Latch input voltage Input threshold voltage Input bias current Latch mode source current Latch input voltage Threshold voltage Input current Source current Output block Sink current Output leakage current Standby current Supply current when output Symbol VICM Vt100 IIbdt IIdt VIdt Vt100 IIbdt IIdt VIdt ICC0 VCTL VCTL Duty cycle Duty cycle Duty cycle Duty cycle Conditions Value Min. -200 -0.2 1.05 VREF- 1.05 Typ. -100 -500 Max. VCC-1.8 2.25 2.25 Unit
General
Channel control block
CH/4 dead time control circuit
MB3785A
TYPICAL CHARACTERISTIC CURVES
Supply current Supply voltage Reference voltage Supply voltage
Supply current (mA)
+25°C
Reference voltage VREF
+25°C
CTL1, CTL1,
CTL1
Supply voltage
Supply voltage
Reference voltage Output current setting voltage Supply voltage
Reference voltage VREF
Reference voltage Ambient temperature
Voltage Output Current Setting
2.56 2.54
Reference voltage VREF
+25°C
VCTL1,
VREF
2.52 2.50 2.48 2.46 2.44
Supply voltage
Ambient temperature (°C)
Reference voltage Control voltage
+25°C
Control current ICTL1 (µA)
Control current Control voltage
+25°C
Reference voltage VREF
Control voltage VCTL1
Control voltage VCTL1
(Continued)
MB3785A
(Continued)
Triangular wave maximum amplitude voltage Timing capacitance
Triangular wave maximum amplitude voltage VMAX Triangular wave frequency fOSC (Hz)
Triangular wave frequency Timing resistance
+25°C
+25°C
15000
103104
104105
Timing capacitance (pF)
1500
K100
Triangular wave cycle Timing capacitance
Triangular wave cycle TOSC (µsec)
Timing resistance
+25°C
Duty
Duty Triangular wave frequency
1.60 +25°C
Timing capacitance (pF)
Triangular wave frequency (Hz)
Rate change triangular wave frequency Ambient temperature (Not using ceramic resonator)
Rate change triangular Wave frequency
Rate change triangular wave frequency Ambient temperature (Using ceramic resonator)
Rate change triangular Wave frequency
fOSC
fOSC
Ambient temperature (°C)
Ambient temperature (°C)
(Continued)
MB3785A
(Continued)
Gain Frequency Phase Frequency
+25°C
Error maximum output voltage Frequency
Error maximum output voltage amplitude
Frequency (Hz)
+25°C
Phase (deg)
Gain (dB)
-180
Triangular wave frequency fOSC (Hz)
[Measuring Circuit]
Error
Power dissipation Ambient temperature
1000 Power dissipation (mW) LQFP
Ambient temperature (°C)
MB3785A
METHODS SETTING OUTPUT VOLTAGE
Method Connecting Channels When Output Voltage (VO) Positive
VREF VOUT+
VREF
Method Connecting Channels When Output Voltage (VO) Negative
VREF VREF VREF
VOUT-
MB3785A
Method Connecting Channels When Output Voltage (VO) Positive
VREF VOUT
VREF
Method Connecting Channels When Output Voltage (VO) Negative
VREF VREF VREF
VOUT-
MB3785A
METHOD SETTING OUTPUT CURRENT
output circuit comprised totem-pole configuration. output current waveform such that ON-current value constant current OFF-current value time constant shown Figure These output currents using equations below. ON-current 2.5/RE (Voltage output current-setting OFF-current time constant proportional value
Figure Output Circuit
Drive transistor
Figure Output Current Waveform
ON-current
OFF-current OFF-current setting block
Output current
OFF-current
ON-current
Figure Voltage Current Waveforms Output (CH1)
Figure Measuring Circuit Diagram
1000
MB3785A
(mA)
(µS)
MB3785A
METHOD SETTING TIME CONSTANT TIMER/LATCH-ACTUATED SHORTCIRCUTING PROTECTION CIRCUIT
Figure schematically shows protection latch circuit. outputs from output-shorting detection comparators respectively connected inverted inputs comparator. These inputs always compared with reference voltage approximately which non-inverted input comparator. While switching regulator load conditions stable, there changes outputs comparators that short-circuit protection control keeps equilibrium state. this time, voltage terminal (pin held approximately When load conditions change rapidly short-circuiting load, example, output voltage comparator relevant channel goes (2.1 more). Consequently, comparator outputs "L", causing transistor turn off, short-circuit protection capacitor (externally fitted terminal) begins charge. 10-6/CPE 0.65 10-6/CPE tPE/0.6 (sec) When external capacitor charged approximately 0.65 latch output drive transistor turned off. Simultaneously, dead time extended 100% output voltage terminal (pin held "L". result, latch input closed discharged.
Figure Protection Latch Circuit
Comparator Comparator Comparator Comparator
comparator
Latch
U.V.L.O
MB3785A
TREATMENT WHEN USING
When timer/latch-actuated short-circuiting protection circuit, connect terminal (pin with shortest distance possible. Also, connect comparator's input terminal each channel VCC1 terminal (pin 18).
Figure Treatment When Using
VCC1
-IN1
-IN2
-IN3
-IN4
MB3785A
METHOD SETTING TRIANGULAR-WAVE OSCILLATOR CIRCUIT
When Using Ceramic Resonator
Connect OSCIN terminal (pin leave OSCOUT terminal (pin open. This makes possible oscillation frequency with only
Figure When Using Ceramic Resonator
OSCIN
OSCOUT
Open
When Using Ceramic Resonator
connecting ceramic resonator between OSCIN OSCOUT shown below, oscillation frequency. this case, too, required. Determine values that oscillation frequency this network about 5-10% lower than that ceramic resonator.
Figure When Using Ceramic Resonator
OSCIN Ceramic resonator
OSCOUT
MB3785A
<Precautions> When oscillation rise time power switch-on compared between ceramic crystal resonator, known that crystal resonator about times slower rise than ceramic resonator. Therefore, when crystal resonator used, system operation switching regulator power switch-on becomes unstable. avoid this problem, recommended that ceramic oscillator because short rise time and, hence, ensures stable operation.
Crystal Resonator Turn-on Characteristic
(msec)
Ceramic Resonator Turn-on Characteristic
(msec)
MB3785A
METHOD SETTING DEAD TIME SOFT START
Dead Time
When device step-up inverted output based flyback method, output transistor fixed full-on state (ON-duty power switch-on. prevent this problem, determine voltages terminals (pins from VREF voltage easily output transistor's dead time (maximum ON-duty) independently each channel shown below. Channels When voltage terminals (pins higher than triangular-wave output voltage from oscillator, output transistor turns off. dead time calculation formula assuming that triangular-wave amplitude triangular-wave minimum voltage given below. Duty (OFF) [%], VREF
When these terminals, connect them GND.
Figure When Using Dead Time
Figure When Using
VREF
DTC1 (DTC2)
DTC1 (DTC2)
Channels When voltage terminals (pins lower than triangular-wave output voltage from oscillator, output transistor turns off. dead time calculation formula assuming that traingular-wave amplitude triangular-wave maximum voltage given below. Duty (OFF) -Vdt [%], VREF
When these terminals, connect them VREF.
MB3785A
Figure When Using Dead Time
Figure When Using
VREF
VREF
DTC3 (DTC4)
DTC3 (DTC4)
<Precautions> When ceramic resonator, attention when setting dead time because triangular-wave amplitude determined values
Soft Start
prevent inrush current power switch-on, device soft start using terminals (pins 33). diagrams below show set.
Figure Setting Soft Start
Figure Setting Soft Start
VREF DTC1 (DTC2)
VREF
DTC3 (DTC4)
MB3785A
also possible soft start simultaneously with dead time configuring terminals shown below.
Figure Setting Dead Time Soft Start
Figure Setting Dead Time Soft Start
VREF DTC1 (DTC2)
VREF
DTC3 (DTC4)
MB3785A
EQUIVALENT SERIES RESISTOR STABILITY SMOOTHING CAPACITOR
equivalent series resistance (ESR) smoothing capacitor DC/DC converter greatly affects phase characteristics loop depending value. System stability improved because causes phase lead that ideal capacitor high-frequency regions. (See Figures 19.) Conversely, low-ESR smoothing capacitor used, system stability deteriorates. Therefore, low-ESR semiconductor electrolytic capacitors CON) tantalum capacitors calls careful attention.
Figure Basic Circuit Stepdown DC/DC Converter
Figure Gain-Frequency Characteristic
Figure Phase-Frequency Characteristic
Phase (deg)
Gain (dB)
Frequency (Hz)
-180
Frequency (Hz)
MB3785A
(Reference Data)
phase margin halved changing smoothing capacitor from aluminum electrolytic capacitor small-ESR semiconductor electrolytic capacitor CON; (See Figure 22.)
Figure DC/DC Converter Characteristic Measuring Circuit
VOUT
characteristic between this interval
VREF/2 Error
Figure Gain-Frequency Characteristic
Gain frequency phase frequency characteristics electrolytic capacitor (DC/DC converter output)
Gain (dB)
Phase (deg)
electrolytic capacitor FOSC
Frequency (Hz)
-180
Figure Phase-Frequency Characteristic
Gain frequency phase frequency characteristics (DC/DC converter output)
Gain (dB) -180 Phase (deg) fOSC
Frequency (Hz)
MB3785A
EXAMPLE APPLICATION CIRCUIT
1000
1000
1000
1000
1000 Motor Control Signal
motor
1000
Motor Control Signal
1000
motor
1000
VREF Ceramic Resonator Output Control Signals CTL1 CTL2 CTL3
MB3785A
PRECAUTIONS USING DEVICE
input voltages greater than maximum rating.
Inputting voltages greater than maximum rating damage device.
Always device under recommended operating conditions.
voltage greater than maximum value input device, electrical characteristics guaranteed. Similarly, inputting voltage below minimum value cause device operation become unstable.
grounding printed circuit board, wide ground lines possible prevent high-frequency noise.
Because device uses high frequencies, tends generate high-frequency noise.
Take following measures protection against static charge:
containing semiconductor devices, antistatic conductive container. When storing transporting device-mounted circuit boards, conductive container. Ground workbenches, tools, measuring equipment earth. Make sure that operators wear wrist straps other appropriate fittings grounded earth resistance ohms placed series between human body earth.
ORDERING INFORMATION
Part number MB3785APFV Package 48-pin plastic LQFP (FPT-48P-M05) Remarks
MB3785A
PACKAGE DIMENSION
48-pin Plastic LQFP (FPT-48P-M05)
9.00±0.20(.354±.008)SQ 7.00±0.10(.276±.004)SQ
1.50 0.10 .059 .004
+0.20 +.008
(MOUNTING HEIGHT)
5.50 (.217) INDEX
8.00 (.315)
Details part
+0.08 0.03 +.003 .001
LEAD 0.50±0.08 (.0197±.0031) 0.18 .007
0.127 0.02 .005 .001
+0.05 +.002
0.10±0.10 (STAND OFF) (.004±.004)
0.50±0.20 (.020±.008) 0.10(.004)
1995 FUJITSU LIMITED F48013S-2C-5
Dimensions (inches)
MB3785A
FUJITSU LIMITED
further information please contact:
Japan FUJITSU LIMITED Corporate Global Business Support Division Electronic Devices KAWASAKI PLANT, 4-1-1, Kamikodanaka Nakahara-ku, Kawasaki-shi Kanagawa 211-8588, Japan Tel: (044) 754-3763 Fax: (044) 754-3329
Rights Reserved. contents this document subject change without notice. Customers advised consult with FUJITSU sales representatives before ordering. information circuit diagrams this document presented examples semiconductor device applications, intended incorporated devices actual use. Also, FUJITSU unable assume responsibility infringement patent rights other rights third parties arising from this information circuit diagrams. FUJITSU semiconductor devices intended standard applications (computers, office automation other office equipment, industrial, communications, measurement equipment, personal household devices, etc.). CAUTION: Customers considering products special applications where failure abnormal operation directly affect human lives cause physical injury property damage, where extremely high levels reliability demanded (such aerospace systems, atomic energy controls, floor repeaters, vehicle operating controls, medical devices life support, etc.) requested consult with FUJITSU sales representatives before such use. company will responsible damages arising from such without prior approval. semiconductor devices have inherently certain rate failure. must protect against injury, damage loss from such failures incorporating safety design measures into your facility equipment such redundancy, fire protection, prevention over-current levels other abnormal operating conditions. products described this document represent goods technologies subject certain restrictions export under Foreign Exchange Foreign Trade Control Japan, prior authorization Japanese government should required export those products from Japan.
http://www.fujitsu.co.jp/
North South America FUJITSU MICROELECTRONICS, INC. Semiconductor Division 3545 North First Street Jose, 95134-1804, Tel: (408) 922-9000 Fax: (408) 922-9179 Customer Response Center Mon. Fri.: (PST) Tel: (800) 866-8608 Fax: (408) 922-9179
http://www.fujitsumicro.com/
Europe FUJITSU MIKROELEKTRONIK GmbH Siebenstein 6-10 D-63303 Dreieich-Buchschlag Germany Tel: (06103) 690-0 Fax: (06103) 690-122
http://www.fujitsu-ede.com/
Asia Pacific FUJITSU MICROELECTRONICS ASIA #05-08, Lorong Chuan Tech Park Singapore 556741 Tel: (65) 281-0770 Fax: (65) 281-0220
http://www.fmap.com.sg/
F9803 FUJITSU LIMITED Printed Japan

BIPOLAR Switching Regulator Controller Channels plus High-Pr

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