`99.12.8 Step-down DC/DC Converter with Voltage Detector R12
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OUTLINE
`99.12.8
Step-down DC/DC Converter with Voltage Detector
R1221N Series
R1221N Series step-down DC/DC Converter controllers embedded with voltage detector, with supply current CMOS process. Each step-down DC/DC converter these consists oscillator, control circuit, reference voltage unit, error amplifier, soft-start circuit, protection circuit, PWM/VFM alternative circuit, chip enable circuit, resistors voltage detection. ripple, high efficiency step-down DC/DC converter composed this with only four external components, power-transistor, inductor, diode capacitor. output voltage DC/DC converter supervised built-in voltage detector. With PWM/VFM alternative circuit, when load current small, operation turns into oscillator from oscillator automatically, therefore efficiency small load current improved. PWM/VFM alternative circuit option, terms version version, circuit included. term maximum duty cycle keeps certain time, embedded protection circuit works. There types protection function. latch-type protection circuit, works latch external Power with keeping disable. release condition protection, after disable this with chip enable circuit, enable again, restart this with power-on. other Reset-type protection circuit, works restart operation with soft-start repeat this operation until maximum duty cycle condition released. Either these protection circuits designated users' request.
FEATURES
Wide Range Input Voltage 2.3V 13.2V Built-in Soft-start Function choices Protection Function(Latch-type Reset-type) choices Oscillator Frequency 300kHz, 500kHz High Efficiency TYP. Standby Current TYP. Setting Output Voltage Stepwise setting with step 0.1V range 1.5V 5.0V High Accuracy Output Voltage ±2.0% Setting Detector Threshold Voltage Stepwise setting with step 0.1V range 1.2V 4.5V High Accuracy Detector Threshold ±2.0% Temperature-Drift Coefficient Output Voltage TYP. ±100ppm/°C
APPLICATIONS
Power source hand-held communication equipment, cameras, video instruments such VCRs, camcorders. Power source battery-powered equipment. Power source household electrical appliances.
Rev. 1.11
BLOCK DIAGRAM
VOUT
Vref
PWM/VFM CONTROL Protection Soft Start Chip Enable
Vref
VDOUT
SELECTION GUIDE
R1221N Series, output voltage, detector threshold, oscillator frequency, optional function, taping type selected user's request. selection made designating part number shown below;
R1221NXXXX-TR
Code Contents Setting Output Voltage(VOUT): Stepwise setting with step 0.1V range 1.5V 5.0V possible. Setting Detector Threshold(-VDET) Stepwise setting with step 0.1V range 1.2V 4.5V possible. A:3.0V Designation Oscillator Frequency Optional Function A:300kHz, with PWM/VFM alternative circuit, Latch-type protection B:500kHz, with PWM/VFM alternative circuit, Latch-type protection C:300kHz, without PWM/VFM alternative circuit, Latch-type protection D:500kHz, without PWM/VFM alternative circuit, Latch-type protection E:300kHz, with PWM/VFM alternative circuit, Reset-type protection F:500kHz, with PWM/VFM alternative circuit, Reset-type protection G:300kHz, without PWM/VFM alternative circuit, Reset-type protection H:500kHz, without PWM/VFM alternative circuit, Reset-type protection
Rev. 1.11
CONFIGURATION
SOT-23-6W
VOUT
(mark side) VDOUT
DESCRIPTION
Symbol VDOUT VOUT Description External Transistor Drive (Output Type CMOS) Voltage Detector Output (Output Type Open Drain Power Supply Chip Enable Ground Monitoring Output Voltage
ABSOLUTE MAXIMUM RATING
Symbol VEXT VDOUT VOUT IEXT Topt Tstg Item Supply Voltage Output Voltage Input Voltage VDOUT Output Voltage VOUT Input Voltage Inductor Drive Output Current Power Dissipation Operating Temperature Range Storage Temperature Range Rating -0.3~VIN+0.3 -0.3~VIN+0.3 -0.3~15 -0.3~VIN+0.3 -40~+85 -55~+125 Unit
Rev. 1.11
ELECTRICAL CHARACTERISTICS
lR1221N***A(C,E,G) Output Voltage Detector Threshold Symbol VOUT Item Operating Input Voltage Step-down Output Voltage VIN=VCE=Vo+1.2V, IOUT=-10mA Conditions (Topt=25°C) MIN. TYP. MAX. Note* Unit 0.98 DVOUT/ fosc DfOSC/ IDD1 Istb IEXTH IEXTL ICEH ICEL VCEH VCEL Maxdty VFMdty Tstart Step-down Output Voltage Temperature Coefficient Oscillator Frequency Frequency Temperature Coefficient Supply Current1 Standby Current Output Current Output Current Input Current Input Current Input Voltage Input Voltage Oscillator Maximum Duty Cycle Duty Cycle Delay Time Soft-Start function Tprot IVDLK IVDL -VDET Applied versions only VIN=Vo+1.2V,VCE=0V®Vo+1.2V rising 1.02 VIN=13.2V,VCE=13.2V,VOUT=13.2V VIN=13.2V,VCE=0V,VOUT=0V VIN=8V,VEXT=7.9V,VOUT=8V,VCE=8V VIN=8V,VEXT=0.1V,VOUT=0V,VCE=0V VIN=13.2V,VCE=13.2V,VOUT=13.2V VIN=13.2V,VCE=0V,VOUT=13.2V VIN=8V,VCE=0V®1.5V VIN=8V,VCE=1.5V®0V -0.5 VIN=VCE=Vo+1.2V, IOUT=-100mA -40°C Topt 85°C ±0.3 -40°C Topt 85°C ±100 13.2 1.02 ppm/
Delay Time protection circuit VIN=Vo+1.2V,VCE=Vo+1.2V®0V VDOUT Output Leakage Current VIN=VOUT=VCE=VDOUT=8V VDOUT Output Current Detector Threshold
VIN=VOUT=2.3V, VCE=0V, VDOUT=0.1V VIN=6V, VCE=6V, 0.98
tVDET
Output Delay Time Released VIN=6V, VCE=6V, Voltage rising VIN=6V, VCE=6V, -40°C Topt 85°C
VHYS
Detector Threshold Hysteresis
0.01
0.03 ±100
0.05
D-VDET/
Detector Threshold
ppm/
Temperature Coefficient Note: Refer Test Circuits
Rev. 1.11
lR1221N***B(D,F,H) Output Voltage Detector Threshold Symbol VOUT Item Operating Input Voltage Step-down Output Voltage VIN=VCE=Vo+1.2V, IOUT=-10mA Conditions
(Topt=25°C) MIN. TYP. MAX. Note* Unit 0.98 13.2 1.02 ±100 ppm/
DVOUT/ fosc DfOSC/ IDD1 Istb IEXTH IEXTL ICEH ICEL VCEH VCEL Maxdty VFMdty Tstart
Step-down Output Voltage Temperature Coefficient Oscillator Frequency Frequency Temperature Coefficient Supply Current1 Standby Current Output Current Output Current Input Current Input Current Input Voltage Input Voltage Oscillator Maximum Duty Cycle Duty Cycle Delay Time Soft-Start function
-40°C Topt 85°C
VIN=VCE=Vo+1.2V, IOUT=-100mA -40°C Topt 85°C
±0.3
VIN=13.2V,VCE=13.2V,VOUT=13.2V VIN=13.2V,VCE=0V,VOUT=0V VIN=8V,VEXT=7.9V,VOUT=8V,VCE=8V VIN=8V,VEXT=0.1V,VOUT=0V,VCE=0V VIN=13.2V,VCE=13.2V,VOUT=13.2V VIN=13.2V,VCE=0V,VOUT=13.2V VIN=8V,VCE=0V®1.5V VIN=8V,VCE=1.5V®0V Applied versions only VIN=Vo+1.2V,VCE=0V®Vo+1.2V rising -0.5
Tprot IVDLK IVDL -VDET
Delay Time protection circuit VIN=Vo+1.2V,VCE=Vo+1.2V®0V VDOUT Output Leakage Current VIN=VOUT=VCE=VDOUT=8V VDOUT Output Current Detector Threshold VIN=VOUT=2.3V,VCE=0V, VDOUT=0.1V VIN=6V, VCE=6V,
0.98
1.02
tVDET
Output Delay Time Released VIN=6V, VCE=6V, Voltage rising VIN=6V, VCE=6V, -40°C Topt 85°C
VHYS
Detector Threshold Hysteresis
0.01
0.03 ±100
0.05
D-VDET/
Detector Threshold
ppm/
Temperature Coefficient Note: Refer Test Circuits
Rev. 1.11
TEST CIRCUITS
PMOS
PMOS
OSCILLOSCOPE OSCILLOSCOPE
OSCILLOSCOPE
VOUT
VOUT
VEXT
VOUT
VDOUT
VOUT
OSCILLOSCOPE
Inductor 27mH(Sumida Electronic, CD104) Capacitor 47mF(Tantalum type) Power PMOS HAT1020R(Hitachi)
Diode RB491D (Rohm, Schottky type) 22mF(Tantalum type) Resistor 100kW
Rev. 1.11
TYPICAL APPLICATIONS APPLICATION HINTS
PMOS VDOUT VOUT COUT
Reset/
CONTROL
PMOS: HAT1020R (Hitachi), Si3443DV (Siliconix) RB491D (Rohm) :10mF(Tantalum Type) CD105(Sumida, 27mH) COUT 47mF(Tantalum Type) 100kW
When these ICs, consider following issues; shown block diagram, parasitic diode formed each terminal, each these diodes formed load current, therefore such way. When control another power supply, make level more than voltage level pin. Detector threshold hysteresis percent detector threshold voltage. (Min. percent, Max. percent) Setting Detector threshold voltage range depends Output voltage DC/DC converter. Release Voltage from Reset condition must more than Output voltage DC/DC converter. (Detector Threshold Output Voltage DC/DC When R1221NXXXX stand-by mode, output voltage VDOUT level, therefore pull-up resistor VDOUT pulled another power supply, certain amount current loading through resistor. operation Latch-type protection circuit follows; When maximum duty cycle continues longer than delay time protection circuit, (Refer Electrical Characteristics) protection circuit works shut-down external Power with latching operation. Therefore when input/output voltage difference small, protection circuit work even small load current. release protection state, after disable this with chip enable circuit, enable again, restart this with power-on. However, case restarting this with power-on, after power supply turned off, certain amount charge remains CIN, some voltage forced from CIN, this might restarted even after power-on. rising transition speed supply voltage slow, time which required voltage reach Output Voltage DC/DC converter longer than soft-starting time plus delay time protection circuit, protection circuit works before voltage reaches Output Voltage DC/DC converter. avoid this condition, make this disable(CE="L") first, then force voltage, after voltage becomes equal more than VOUT, make this enable(CE="H"). external components close possible minimize connection between components particular, capacitor should connected VOUT with minimum connection. make sufficient grounding reinforce supplying. large switching current flows through connection power supply, inductor connection VOUT. impedance power supply line high, voltage level power supply fluctuates with switching current. This cause unstable operation
Rev. 1.11
capacitors with capacity 22mF more VOUT Pin, with good high frequency characteristics such tantalum capacitors. recommend capacitors with allowable voltage which least twice much setting output voltage. This because there case where spike-shaped high voltage generated inductor when external transistor off. Choose inductor that sufficiently small D.C. resistance large allowable current hard reach magnetic saturation. value inductance inductor extremely small, exceed absolute maximum rating maximum loading. inductor with appropriate inductance. diode Schottky type with high switching speed, also attention current capacity. this under condition voltage less than minimum operating voltage. performance power source circuits using these extremely depends upon peripheral circuits. attention selection peripheral circuits. particular, design peripheral circuits that values such voltage, current, power each component, patterns exceed their respected rated values.
OPERATION step-down DC/DC converter Output Current
step-down DC/DC converter charges energy inductor when transistor discharges energy from inductor when transistor controls with less energy loss, that lower output voltage than input voltage obtained. operation will explained with reference following diagrams <Basic Circuit> <Current through
IOUT VOUT ILmin
ILmax topen
toff T=1/fosc
Step LxTr turns current IL(=i1) flows, energy charged into this moment, increases from ILmin(=0) reach ILmax proportion on-time period(ton) LXTr. Step When LxTr turns off, Schottky diode(SD) turns order that maintains ILmax, current IL(=i2) flows. Step decreases gradually reaches ILmin after time period topen, turns off, provided that continuous mode, next cycle starts before becomes because toff time enough. this case, value from this ILmin(>0). case control system, output voltage maintained controlling on-time period(ton), sith oscillator frequency(fosc) being maintained constant. Discontinuous Conduction Mode Continuous Conduction Mode maximum value(ILmax) minimum value(ILmin) current which flows through inductor same those when LxTr when OFF. difference between ILmax ILmin, which represented =ILmax -ILmin wherein T=1/fosc=ton+toff
Rev. 1.11
Equation respectively show change current change current OFF. When output current(IOUT) relatively small, topen<toff illustrated above diagram. this case, energy charged inductor during time period discharged entirely during time period toff, therefore ILmin becomes zero(ILmin=0). When Iout gradually increased, eventually, topen becomes toff (topen toff), when IOUT further increased, ILmin becomes larger than zero(ILmin>0). former mode referred discontinuous mode latter mode referred continuous mode.
continuous mode, when Equation solved assumed that solution tonc, tonc Equation When ton<tonc, mode discontinuous mode, when tonc, mode continuous mode.
OUTPUT CURRENT SELECTION EXTERNAL COMPONENTS
When LxTr (Wherein, Ripple Current value described IRP, resistance LXTr described direct current inductor described RL.) VIN=VOUT+(Rp When LxTr OFF: toff
Equation Equation solve duty, ton/(toff+ton)=DON, Ripple Current follows; wherein, peak current that flows through LxTr, follows; ILmax=IOUT+IRP/2
Consider ILmax, condition input output select external components. HThe above explanation directed calculation ideal case continuous mode.
External Components
Inductor Select inductor that peak current does exceed ILmax. larger current than allowable current flows, magnetic saturation occurs make transform efficiency worse. When load current same, smaller value larger ripple current. Provided that allowable current large that case current small, therefore, large output current, efficiency better than using inductor with large value vice versa, Diode diode with (Schottky type recommended.) high switching speed. Reverse voltage rating should more than current rating should equal more than ILmax.
Rev. 1.11
Capacitor CIN, capacitor with ESR(Equivalent Series Resistance) capacity least 10mF stable operation. COUT reduce ripple Output Voltage, therefore 47mF 100mF tantalum type recommended. Transistor Power required this breakdown voltage between gate source should volt higher than Input Voltage. case Input Voltage low, turn completely, select with threshold voltage. large load current necessary your application important, choose with resistance good efficiency. small load current mainly necessary your application, choose with gate capacity good efficiency. Maximum continuous drain current should larger than peak current, ILmax.
Rev. 1.11
TYPICAL CHARACTERISTCS
Output Voltage Output Current
R1221N33AH 3.400 3.380 3.360 3.340 3.320 3.300 3.280 3.260 3.240 3.220 3.200
L=27uH
1.520
R1221N15XH
L=27uH
Output Voltage VOUT(V)
Output Voltage VOUT(V)
1.515 1.510 1.505 1.500 1.495 1.490 1.485 1.480
13.2V 2.3V
4.5V
1E-05 0.0001 0.001 0.01 Output Current IOUT(A)
Efficiency Output Current
1E-05 0.0001 0.001 0.01 Output Current IOUT(A)
R1221N33AA(VIN=4.5V)
CD104-27uH Si3443DV
R1221N33AA(VIN=12V)Si3443DV Output Current IOUT(mA)
CD104-27uH
Efficiency
Efficiency
Output Current IOUT(mA) R1221N33AC(VIN=4.5V)
1000
1000
CD104-27uH Si3443DV
R1221N33AB(VIN=12V)Si3443DV Efficiency
CD104-27uH
Efficiency Output Current IOUT(mA) 1000
Output Current IOUT(mA)
1000
Rev. 1.11
R1221N33AC(VIN=4.5V) Si3443DV Efficiency Output Current IOUT(mA)
CD104-27uH
R1221N33AC(VIN=12V)Si3443DV Efficiency
CD104-27uH
1000
Output Current IOUT(mA)
1000
R1221N50XA(VIN=6.0V) Efficiency
CD104-27uH Si3443DV
R1221N50XA(VIN=12V) Si3443DV Efficiency
CD104-27uH
Output Current IOUT(mA) 1000
1000
Output Current IOUT(mA)
R1221N50XB(VIN=6.0V) Efficiency
CD104-27uH Si3443DV
R1221N50XB(VIN=12V) Si3443DV Efficiency
CD104-27uH
Output Current IOUT(mA) 1000
Output Current IOUT(mA)
1000
Rev. 1.11
R1221N50XC(VIN=6.0V) Si3443DV Efficiency Output Current IOUT(mA)
CD104-27uH
R1221N50XC(VIN=12V) Si3443DV Efficiency
CD104-27uH
1000
Output Current IOUT(mA)
1000
Ripple Voltage Output Current R1221N33AA Ripple Voltage Vrpp(mV)
VIN4.5V VIN8V VIN12V L=27uH C=47uF(Ta)
R1221N50XA Ripple Voltage Vrpp(mV)
L=27uH C=47uF(Ta)
VIN6V VIN8V VIN12V
Output Current IOUT(mA)
1000
Output Current IOUT(mA)
1000
R1221N33AB Ripple Voltage Vrpp(mV)
VIN4.5V VIN8V VIN12V
L=27uH C=47uF(Ta)
R1221N50XB Ripple Voltage Vrpp(mV)
VIN6V VIN8V VIN12V
L=27uH C=47uF(Ta)
1000
Output Current IOUT(mA)
Output Current IOUT(mA)
1000
Rev. 1.11
R1221N33AC
VIN4.5V VIN8V VIN12V
L=27uH C=47uF(Ta)
R1221N50XC
L=27uH C=47uF(Ta)
Ripple Voltage Vrpp(mV)
Ripple Voltage Vrpp(mV)
VIN6V VIN8V VIN12V
Output Current IOUT(mA)
1000
Output Current IOUT(mA)
1000
Oscillator Frequency Input Voltage
Oscillator Frequency fosc(kHz)
R1221N15XB
L=27uH
R1221N15XA Oscillator Frequency fosc(kHz)
L=27uH
Input Voltage VIN(V)
Input Voltage VIN(V)
Output Voltage Input Voltage
R1221N15XB 1.53 Output Voltage Vout(V) 1.52 1.51 1.50 1.49 1.48 1.47 Input Voltage VIN(V)
L=27uH
R1221N15XA 1.53 Output Voltage Vout(V) 1.52 1.51 1.50 1.49 1.48 1.47 Input Voltage VIN(V)
L=27uH
Rev. 1.11
R1221N33AB 3.36 Output Voltage Vout(V)
L=27uH
R1221N33AA 3.36 Output Voltage Vout(V) 3.34 3.32 3.30 3.28 3.26 3.24
L=27uH
3.34 3.32 3.30 3.28 3.26 3.24 Input Voltage VIN(V)
Input Voltage VIN(V)
Output Voltage Temperature
R1221N33AH 3.31 Output Voltage VOUT(V) 3.30 3.29 3.28 3.27
L=27uH
R1221N15XB 1.51 Output Voltage VOUT(V)
L=27uH
1.50
1.49
1.48
1.47 Temperature Topt (°C) Temperature Topt(°C)
Detector Threshold Temperature
R1221N25XA(VD=2.0V) VIN=6V 2.01 Detector Threshold VDOUT(V) Detector Threshold VDOUT(V) 1.22
R1221N15XB(VD=1.2V)
2.00
1.21
1.99
1.20
1.98
1.19
1.97 Temperature Topt(°C)
1.18 Temperature Topt (°C)
Rev. 1.11
R1221N33AB(VD=3.0V) 3.06 Detector Threshold VDOUT(V) 3.04 3.02 3.00 2.98 2.96 2.94
VIN=6V
Temperature Topt(°C)
Oscillator Frequency Temperature
R1221N33AB Oscillator Frequency fosc(kHz)
L=27uH VIN=4.5V
R1221N25XA Oscillator Frequency fosc(kHz)
L=27uH VIN=3.7V
Temperature Topt (°C)
Temperature Topt(°C)
Supply Current Temperature R1221N33AH Supply Current1(uA) Temperature Topt(°C) Temperature Topt(°C)
VIN15V VIN13.2V VIN8V
R1221N33AG
VIN15V VIN13.2V VIN8V
Rev. 1.11
Supply Current1(uA)
Soft-start Time Temperature R1221N33AB Soft-start Time(msec) Temperature Topt(°C) Soft-start Time (msec)
L=27uH VIN=4.5V
R1221N25XA
L=27uH VIN=3.7V
Temperature Topt (°C)
Delay Time Latch-type Protection Temperature R1221N33AB Delay Time Latch-type Protection(msec) Delay Time Latch-type Protection(msec) Temperature Topt(°C)
VIN=4.5V
R1221N25XA
VIN=3.7V
Temperature Topt(°C)
Delay Time Reset-type Protection Temperature R1221N33AH Delay Time Reset-type Protection(msec) Delay Time Reset-type Protection(msec) (°C) Temperature Topt
VIN=4.5V
R1221N33AG
VIN=4.5V
Temperature Topt (°C)
Rev. 1.11
Output Delay Time Temperature R1221N33AB
Output Delay Time (msec) VIN=8.0V
R1221N25XA Output Delay Time(msec)
VIN=8.0V
Temperature Topt(°C)
Temperature Topt(°C)
EXT"H" Output Current Temperature R1221N33AB EXT"H" Output Current(mA) Temperature Topt (°C)
Output Current Temperature R1221N33AB EXT"L"Output Current(mA) Temperature Topt(°C)
Rev. 1.11
VDOUT Output Current Temperature
R1221N33AD VDLC(mA) Temperature Topt (°C)
Load Transient Response
R1221N33AA 0.0005 Time (sec)
VIN=5V L=27uH
R1221N33AA 0.05 Time (sec)
VIN=5V L=27uH
Output Voltage VOUT(V)
Output Current IOUT(mA)
Output Voltage VOUT(V)
0.001
Output Current IOUT(mA)
R1221N33AB 0.0005 Time (sec)
VIN=5V L=27uH
R1221N33AB 0.05 Time (sec)
VIN=5V L=27uH
Output Voltage VOUT(V)
Output Voltage VOUT(V)
Output Current IOUT(mA)
Output Current IOUT(mA)
0.001
Rev. 1.11
R1221N33AC 0.0005 Time (sec)
VIN=5V L=27uH
R1221N33AC 0.05 Time (sec)
VIN=5V L=27uH
Output Voltage VOUT(V)
Output Voltage VOUT(V)
Output Current IOUT(mA)
IOUT(mA)
0.001
R1221N33AD 0.0005 Time (sec)
VIN=5V L=27uH
R1221N33AD 0.05 Time (sec)
VIN=5V L=27uH
Output Voltage VOUT(V)
Output Voltage VOUT(V)
IOUT(mA)
Output Current IOUT(mA)
0.001
Turn-on Waveform R1221N33AA(VIN=10V,IOUT=0mA) L=27uH -0.5 -1.5 -2.5 -3.5 -0.01 R1221N33AA(VIN=5V,IOUT=0mA) L=27uH -0.5 -1.5 -2.5 -3.5 -0.01
Output Voltage VOUT(V)
Voltage(V)
Output Voltage VOUT(V)
Voltage(V)
0.02
0.02
0.01 Time (sec)
0.01 Time (sec)
Rev. 1.11
R1221N33AB(VIN=10V,IOUT=0mA) L=27uH -0.5 -1.5 -2.5 -3.5 -0.01 0.01 Time (sec)
R1221N33AB(VIN=5V,IOUT=0mA) L=27uH -0.5 -1.5 -2.5 -3.5 -0.01
Output Voltage VOUT(V)
Output Voltage VOUT(V)
Voltage(V)
Voltage(V
0.02
0.02
0.01 Time (sec)
R1221N33AA(VIN=10V,IOUT=100mA)
L=27uH
R1221N33AA(VIN=5V,IOUT=100mA)
L=27uH
-0.5 -1.5 -2.5 -3.5 -0.01
Voltage(V)
0.02
-0.5 -1.5 -2.5 -3.5 -0.01 0.01 Time (sec)
Output Voltage VOUT(V)
Output Voltage VOUT(V)
Voltage(V)
0.02
0.01 Time (sec)
R1221N33AB(VIN=10V,IOUT=100mA)
L=27uH
R1221N33AB(VIN=5V,IOUT=100mA)
L=27uH
-0.5 -1.5 -2.5 -3.5 -0.01 0.01 Time (sec)
0.02
-0.5 -1.5 -2.5 -3.5 -0.01 0.01 Time (sec)
Output Voltage VOUT(V)
Output Voltage VOUT(V)
Voltage(V)
Voltage(V)
0.02
Rev. 1.11
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