FA7701V Datasheet PDF & Specifications

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FA7700V ETC

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Manufacturer or author: Provided By www.digicamel.com(FREE DATASHEET DOWNLOAD SITE)
PDF pages: 13

Technical content

FA7700V, FA7701V I Block diagram

FA7700V ● FA7701V FA7700V, FA7701V I Dimensions, mm
TSSOP-8 ±0.24.4 ±0.36.4 10 to 0˚ ±0.33.1 ±0.10.15 ±0.050.1 1.30 max ±0.10.22 ±0.20.50.65 0.575 typ I Description FA7700V/FA7701V are the PWM type DC to DC converter control ICs with 1ch output that can directly drive power MOSFETs. CMOS devices with high breakdown voltage are used in these ICs and low power consumption is achieved. These ICs have not only the functions equivalent to those of FA76XX series but also the functions of directly driving Nch/Pch MOSFETs, lower power consumption, higher frequency operation, and less external components. I Features
Wide range of supply voltage: VCC =2.5 to 20V
FA7700V: For boost, flyback converter (Maximum output duty cycle is 80%)
FA7701V: For buck converter (Maximum output duty cycle is 100%)
Output stage consist of CMOS push-pull circuit, and achieves a high speed switching of external MOSFETs. (FA7700V: For Nch-MOSFET driving, FA7701V: For Pch-MOSFET driving)
High accuracy reference voltage (Error amplifier): 0.88V±2%
Soft start function
Adjustable built-in timer latch for short-circuit protection
Output ON/OFF control function
Less external discrete components needed (2 components less than conventional version of the equivalent products)
Low power consumption Stand-by current: 40µA typ. Operating current: 1.2mA typ. (Including error amplifier output current and oscillator current)
High frequency operation: 50kHz to 1MHz
Package: TSSOP-8, thin and small Pin No. Pin symbol Description

1 RT Oscillator timing resistor

2 REF Internal bias voltage

3 IN (–) Error amplifier inverting input

4 FB Error amplifier output

5 GND Ground

6 OUT Output for driving switching device

7 VCC Power supply

8 CS ON/OFF , soft start, timer latched short

5.5V OFF 4FB IN– PWM ON/OFF S.C.DET 0.3V 1.5V 1.5V S.C.P 2.2V VREF Power Good Signal ON/OFF CS VCC OUT GND 0.88V ER.AMP 2.2V PWM– ER.AMP ON/OFF VREF OSC BIAS UVLO 5.5V ON/OFF S.C.DET 0.3V 1.5V 1.5V S.C.P 2.2V OFF RT REF 4FB IN– CS VCC OUT GND 0.88V Power Good Signal VREF 2.2V CMOS IC For Switching Power Supply Control

FA7700V, FA7701V I Absolute maximum ratings Maximum power dissipation curve Item Symbol Rating Unit Power supply voltage Vcc 20 V REF terminal output current I REF 2m A OUT terminal source current I SO peak –400 (peak) mA ISO cont –50 (continuos) OUT terminal sink current I SI peak +150 (peak) mA ISI cont +50 (continuos) RT, REF , IN–, FB terminal voltage V RT , VREF +2.5 (max.) V VIN–, VFB –0.3 (min.) CS terminal voltage V CS Self limiting/H113405.5 (max.) V –0.3 (min.) CS terminal sink current I CS 200 µA Power dissipation Pd 250 (Ta /H1101725˚C) mW Operating ambient temperature Ta –30 to +85 ˚C Operating junction temperature Tj +125 ˚C Storage temperature T stg –40 to +150 ˚C –30 30 90600 125 150 Ambient temperature [˚C] Max. power dissipation [mW]50 100 150 200 250 300 I Recommended operating condition Item Symbol Min. Typ. Max. Unit Supply voltage V CC 2.5 6 18 V DC feedback resistor of error amplifier R NF 100 k Ω VCC terminal capacitance C VCC 0.1 µF REF terminal capacitance C REF 0.047 0.1 1 µF CS terminal capacitance C S 0.01 10 µF CS terminal sink current I csin 1* 50 µA Oscillation frequency f osc 50 1000 kHz * Lower limit of ICSIN does not include leak current “IL” for capacitor Cs. Set a resistor “R CS [MΩ ]” connected between VCC terminal and CS terminal to satisfy the equation. VCC – 1.5/H11021 RCS [MΩ ] /H11021VCC – 1.5 50µA + IL 1µA + IL

FA7700V, FA7701V Pulse width modulation (PWM) section (FB terminal voltage and duty cycle) Item Symbol Test condition Min. Typ. Max. Unit FB 0% threshold V FB0 Duty cycle = 0% 0.560 0.660 0.760 V FB 50% threshold V FB50 Duty cycle = 50% 0.880 V Maximum duty cycle FA7700 D MAX1 R T=100kΩ , f=50kHz 85 90 95 % D MAX2 R T=22kΩ , f/H11340185kHz 83 88 93 % D MAX3 R T=3kΩ , f/H113401MHz 80 86 92 % FA7701 D MAX 100 % Error amplifier section (IN- terminal, FB terminal) Item Symbol Test condition Min. Typ. Max. Unit Reference voltage V B IN- terminal, FB terminal: 0.863 0.880 0.897 V Shorted (voltage follower) Input current I IN– -500 +500 nA VB line regulation V BLINE Vcc=2.5 to 20V ±1 ±5m V VB variation with temperature V BTC1 Ta=–30 to 25°C ±0.3 % VBTC2 Ta=25 to 85°C ±0.3 % Open loop gain A VO 70 dB Unity gain bandwidth f T 1.5 MHz Output current Source I OHE FB terminal=VREF – 0.5V –220 –160 –100 µA Sink I OLE FB terminal=0.5V 3 6 12 mA Oscillator section (Frequency set by RT terminal) Item Symbol Test condition Min. Typ. Max. Unit Oscillation frequency f osc R T=22kΩ 155 185 215 kHz Line regulation f LINE Vcc=2.5 to 20V ±0.1 % Variation with temperature f TC1 Ta=–30 to 25°C, 50k to 1MHz ±2% fTC2 Ta=25 to 85°C, 50k to 1MHz ±3% I Electrical characteristics (Ta=25˚C, VCC =6V, RT=22kΩ ) Internal bias section (REF terminal voltage) Item Symbol Test condition Min. Typ. Max. Unit Output voltage V REF REF terminal source current 2.16 2.23 2.30 V IREF =0mA Line regulation V LINE Vcc=2.5 to 20V, IREF =0mA ±2 ±14 mV Load regulation V LOAD IREF =0 to 2mA ±2 ±12 mV Variation with temperature V TC1 Ta=–30 to 25°C ±0.3 % VTC2 Ta=25 to 85°C ±0.3 % Undervoltage lock-out section (VCC terminal voltage) Item Symbol Test condition Min. Typ. Max. Unit ON threshold V CCON 2.07 2.30 V OFF threshold V CCOF 1.60 1.93 V Hysteresis voltage V CCHY 0.04 0.14 0.24 V Variation with temperature V CCHY Ta= –30 to 25°C +0.2 mV/ °C Ta= 25 to 85°C –0.2 mV/ °C

FA7700V, FA7701V Soft start section (CS terminal voltage) Item Symbol Test condition Min. Typ. Max. Unit Threshold voltage 1 V CS0 Duty cycle=0% 0.560 0.660 0.760 V Threshold voltage 2 V CS50 Duty cycle=50% 0.880 V ON/OFF section (CS terminal voltage) Item Symbol Test condition Min. Typ. Max. Unit ON/OFF threshold V ONOF 0.150 0.300 0.450 V Threshold variation with temperature V ONTC Ta = –30 to 85°C +0.5 mV/ °C Timer latched short circuit protection section (FB terminal, CS terminal) Item Symbol Test condition Min. Typ. Max. Unit Short detection threshold voltage V FBTH FB terminal voltage 1.350 1.500 1.650 V Latched mode threshold voltage V CSTH CS terminal voltage 2.050 2.200 2.350 V Latched mode reset voltage V CSRE CS terminal voltage 1.700 2.030 2.300 V Latched mode hysteresis V CSHY CS terminal voltage 50 170 350 mV CS terminal clamped voltage V CSCL1 FB terminal<1.35V, CS sink current= +1µA 1.400 1.500 1.600 V VCSCL2 FB terminal>1.65V, CS sink current= +150µA 4.500 5.500 6.500 V Overall section (Supply current to VCC terminal) Item Symbol Test condition Min. Typ. Max. Unit OFF mode supply current I CCST1 CS terminal=0V 40 100 µA Operating mode supply current I CC0 Duty cycle=0%, OUT:Open, IN–=0V, FB:Open 0.9 1.5 mA ICC1 Duty cycle=50%, OUT:Open, IN–, FB:Shorted 1.2 2.0 mA Latched mode supply current I CCLAT CS terminal >2.35V, IN–=0V, FB:Open 0.9 1.5 mA Output stage section (OUT terminal) Item Symbol Test condition Min. Typ. Max. Unit High side on resistance R ONH VCC=6V, source current= –50mA 10 20 Ω R ONH VCC=2.5V, source current= –50mA 18 36 Ω Low side on resistance R ONL VCC=6V, sink current= +50mA 5 10 Ω R ONL VCC=2.5V, sink current= +50mA 5 10 Ω Rise time FA7700 tr 330pF load to GND terminal 20 ns FA7701 330pF load to VCC terminal 25 ns Fall time FA7700 tf 330pF load to GND terminal 45 ns FA7701 330pF load to VCC terminal 40 ns

FA7700V, FA7701V I Characteristic curves Oscillation frequency (fOSC ) vs. Oscillation frequency (f OSC ) vs. ambient temperature timing resistor resistance (RT) Duty cycle vs. FB terminal voltage Duty cycle vs. CS terminal voltage FA7700 FA7700 Duty cycle vs. FB terminal voltage Duty cycle vs. CS terminal voltage FA7701 FA7701 11 0 100 100 1000 10000 Timing resisitor RT [kΩ ] Oscillation frequency [kHz] Ambient temperature Ta [˚C] Oscillation frequency variation [%] –40 –20 0 20 40 60 80 100–5 fosc=1MHz fosc=50kHz fosc=185kHz FB terminal voltage [V] Duty cycle [%] 100 fosc=1MHz fosc=185kHz CS terminal voltage [V] Duty cycle [%] 100 fosc=1MHz fosc=185kHz Duty cycle [%] 100 FB terminal voltage [V] fosc=1MHz fosc=185kHz Duty cycle [%] 100 CS terminal voltage [V] fosc=1MHz fosc=185kHz

FA7700V, FA7701V Maximum duty cycle vs. ambient temperature Error amp. reference voltage vs. ambient temperature FA7700 Internal bias voltage vs. ambient temperature Undervoltage lock-out vs. ambient temperarure CS terminal ON/OFF threshold vs. CS terminal voltage vs. CS terminal sink current ambient temperature –40 –20 0 20 40 60 80 100 Ambient temperature Ta [˚C] Max. duty cycle [%] fosc=1MHz fosc=50kHz fosc=185kHz 0.86 –40 –20 0 20 40 60 80 100 Ambient temperature Ta [˚C] Reference voltage [V] 0.87 0.88 0.89 0.90 2.18 –20–40 0 20 40 60 80 100 Ambient temperature Ta [˚C] Internal bias voltage [V] 2.20 2.22 2.24 2.26 2.28 Vcc ON Vcc OFF 1.80 –20–40 0 20 40 60 80 100 Ambient temperature Ta [˚C] Vcc terminal ON/OFF threshold 1.85 1.90 1.95 2.00 2.20 2.15 2.10 2.05 0.15 –20–40 0 20 40 60 80 100 Ambient temperature Ta [˚C] CS terminal ON/OFF threshold0.20 0.25 0.30 0.35 0.40 0 123 4 5 6 7 CS terminal voltage [V] 100 120 140 160 180 200 CS terminal sink current [ A] –30˚C Ta=–30˚C Ta=25˚C Ta=25˚C 85˚C Ta=85˚C FB >1.65V FB <1.35V

FA7700V, FA7701V Operating mode supply current vs. VCC Operating mode supply current vs. VCC OFF mode supply current vs. temperature Operating mode supply current vs. temperature Latched mode supply current vs. temperature Oscillation frequency vs. operating mode supply current Vcc [V] Operating mode supply current [mA] fosc=185kHz fosc=1MHz Duty=50% IN(–)–FB:shorted 0.5 1 1.5 2 2.5 3 1.5 0.5 fosc=185kHz fosc=1MHz Duty=50% IN(–)–FB:shorted Vcc [V] Operating mode supply current [mA] 6 8 10 12 14 16 2.5 1.5 0 18 20 0.5 CS=0V Vcc=20V Vcc=6V –40 Temperature Ta [˚C] –20 0 20 40 60 80 100 OFF mode supply current [ A] R T=22kΩ Vcc=20V (Duty=50%) Vcc=6V (Duty=50%) Vcc=6V (Duty=0%) 1.2 Operating mode supply current [mA] 1.1 0.9 0.6 0.8 0.7 –40 Temperature Ta [˚C] –20 0 20 40 60 80 100 1.3 1.4 1.5 Vcc=6V R T=22kΩ CS > 2.35V 0.85 Operating mode supply current [mA] 0.8 0.75 0.7 –40 Temperature Ta [˚C] –20 0 20 40 60 80 100 0.9 0.95 Vcc=6V Duty=50% 1.5Operating mode supply current [mA] 0.5 Oscillation frequency [kHz] 10 100 1000 2.5

FA7700V, FA7701V OUT terminal source current vs. OUT terminal voltage OUT terminal sink current vs. OUT terminal voltage Error amplifier gain and phase vs. frequency OUT terminal voltage [V] 300 5 10 15 20 25 250 200 150 100 OUT terminal source current [mA] 350 400 450 Vcc=12V Vcc=20V Vcc=6V Vcc=2.5V OUT terminal voltage [V] 0.5 1 1.5 OUT terminal source current [mA] 100 150 200 1M Ω 390Ω Frequency [Hz] 1k 10k 100k 1M 10M 80 180 –20 Gain [dB] Gain Phase Phase [deg] 3 6 3 6 3 6 3 6 3 6 160 140 120 100

FA7700V, FA7701V I Description of each circuit 1. Reference voltage circuit This circuit consists of the reference voltage circuit using band gap reference, and also serves as the power supply of the internal circuit. The precision of output is 2.23V±3%. It is stabilized under the supply voltage of 2.5V or over. The precision of reference voltage of error amplifier circuit is 0.88V±2%, and the reference voltage circuit is connected to the non-inverting input of the error amplifier circuit. 2. Oscillator The oscillator generates a triangular waveform by charging and discharging the built-in capacitor. A desired oscillation frequency can be determined by the value of the resistor “R connected to the RT terminal (Fig. 1). The built-in capacitor voltage oscillates between approximately 0.66V and 1.1V with almost the same charging and discharging gradients. Y ou can set the desired oscillation frequency by changing the gradients using the resistor connected to the RT terminal. (Large R T: Low frequency, small RT: High frequency) The oscillator waveform cannot be observed from the outside because a terminal for this purpose is not provided. The oscillator output is connected to the PWM comparator. 3. Error amplifier circuit The IN(–) terminal (Pin 3) is an inverting input terminal. The non-inverting input is internally connected to the reference voltage (0.88V±2%; 25˚C). The FB terminal (Pin 4) is the output of the error amplifier. Gain setting and phase compensation setting is done by connecting a capacitance and a resistor between the FB terminal and the IN(–) terminal. Vout which is the output voltage of DC to DC converter can be calculated by: Gain A V between the Vout and the FB terminal can be calculated by: Vout = VB /H11003 R1 + R2 AV = – R NF Fig. 1 Fig. 2 OSC RT 0.66V 1.1V RT value: small RT value: large PMW output /L54706 Oscillation output /L54707 CS terminal voltage /L54708 Error amplifier output /L54709 DT voltage VB RNFVout IN(–) PWM FB Er. AMP (0.88V) Fig. 3 Fig. 4 Fig. 5 PWM output pulse /L54706 Oscillation output /L54708 Error amplifier output /L54707 CS terminal voltage /L54709 DT voltage 4. PWM comparator The PWM comparator has 4 input terminals. (Fig. 4) The oscillator output /L54706 is compared with the CS terminal voltage /L54707, and the error amplifier voltage /L54708, then, the lower voltage between /L54707 and /L54708 is preferred. While the preferred voltage is lower than the oscillator output, the PWM comparator output is Low. While the preferred voltage is higher than the oscillator output, the PWM comparator output is High (Fig. 5). When the IC starts, the capacitor connected to the CS terminal is charged through the resistor connected to the power supply, and then the output pulses begin to widen gradually as the operation of soft start. In steady operation, the pulse width is determined based on the voltage of the error amplifier /L54708, and then the output voltage is stabilized. The Dead Time control voltage (/L54709 DT voltage) of FA7700 and FA7701 has different characteristics to adjust the ICs to various types of power supply circuits being controlled and also to reduce external discrete components as many as possible. FA7700 is developed for fly-back circuits, and boost circuits, and the DT voltage is set in the IC so that the maximum output duty cycle is fixed to 80% min.. (Maximum output duty cycle changes according to operation frequencies. ––See page 6 “Maximum output duty vs. temperature”.) It prevents magnetic saturation of the transformer or the like when a short-circuit in the output circuit occurs. FA7701 is developed for buck circuits, and it is designed for the maximum output duty cycle of 100%. The timing chart of PWM comparator is described in Fig. 5.

FA7700V, FA7701V tp [ms] /H11340 Cs /H11003 RCS /H11003 1n Vcc – 1.5 Vcc – 2.2() Fig. 8 Time tp Soft start Start-up Lower value of either 5.5V or Vcc terminal voltage CS terminal voltage [V] Momentary short circuit Short circuit protection Short circuit 2.2V 1.5V Vcc – 1.5 /H11021 Rcs [MΩ ] /H11021Vcc – 1.5 50µA + IL 1µA + IL VCC VCC – 0.88() 5. Soft start function As described in Fig. 6, RCS is connected between CS terminal and VCC terminal, and Cs is connected between CS terminal and GND. The voltage of CS terminal rises when starting the power supply, because Cs is charged by Vcc through Rcs. The soft start function starts by charging a capacitor Cs connected to PWM comparator. To estimate the soft start period, the time (ts) between the start and the moment when the width of output pulse reaches 50% is calculated by: ts [ms] /H11340 Cs /H11003 R CS /H11003 1n Cs : Capacity of Cs [µF] Rcs : Resistance of Rcs [kΩ ] Vcc : Supply voltage [V] The maximum current flowing in Rcs should be within the recommended value (50µA max.). (IL: leak current of capacitor Cs) Note: This IC operates ON/OFF function by the CS terminal (CS < 0.3V typ. : OFF), then it turns off the internal bias voltage VREF (off mode). Therefore, you can not connect the resistor “Rcs” between CS terminal and REF terminal, and can connect the resistor only to VCC terminal. 6. ON/OFF circuit The ON/OFF function can be controlled by external signal to the CS terminal, the IC becomes off mode. When the CS terminal voltage is below 0.30V(typ.), the output of ON/OFF comparator C3 is set to LOW, and the internal power source V REF is shut off, then the IC is switched to the off mode. The power consumption in the off mode is 40µA(typ.). A sample circuit is given in Fig. 7. 7. Timer latch short-circuit protection circuit The short-circuit protection circuit consists of two comparators C1, C2 (Fig. 6). In steady operation, the output of S.C.DET comparator C2 is set to High, and the CS terminal is clamped by the 1.5V Zener diode, because the output of error amplifier is about 1V. If the converter output voltage drops due to a short-circuit, when the output voltage of error amplifier rises excesses 1.5V, the output of S.C.DET comparator C2 is set to low, and then the clamp of Zener diode is turned off. As a result, the voltage of CS terminal rises up to the lower value of either 5.5 V or the voltage of VCC terminal. If the voltage of CS terminal excesses 2.2V , the output of S.C.P comparator C1 is set to high, and the circuit shuts down the output circuit of the IC. When it occurs, the current consumption of the IC is 0.9mA (typ.) because the IC is set to OFF latch mode. The period (tp) between the occurrence of a short-circuit in the converter output and the triggering of the short-circuit protection function can be calculated by the following expression: Cs : Capacitance of Cs [µF] Rcs : Resistance of Rcs [kΩ ] Vcc : Supply voltage [V] Note: When the IC is used in a product with low VCC voltage, the period (tp) of the triggering of the short-circuit protection described above fluctuates significantly. Therefore, sufficient care should be taken in such cases. Example When Rcs=750k Ω , Cs=0.1µF: Vcc=2.5V: tp /H11340 90ms Vcc=3.6V: tp /H11340 30ms Fig. 7 Output off FB 1.5V 2.2V 1.5V5.5V CS RCC Cs Rcs S.C.P S.C.DET 0.3 V REF OFF ON/OFF Fig. 6 CS Cs ON/OFF Vcc

FA7700V, FA7701V Y ou can reset the off latch mode operation of the short-circuit protection by either of the following ways: lowering the CS voltage below 2.03V (typ.); lowering the Vcc voltage below the Off threshold voltage of undervoltage lock out; 1.93V (typ.); lowering the voltage of FB terminal below 1.5V (typ.) The off latch mode action cannot be triggered by externally applying voltage of over 2.2V forcibly to the CS terminal (1.5V, ZD clamped). Characteristics of the current and the voltage of CS terminal is shown in the characteristic curve (CS terminal voltage vs. CS terminal sink current) on page 6. Be sure to use the IC up to the recommended CS terminal current of 50µA. 8. Output circuit The IC contains a push-pull output stage and can directly drive MOSFETs (FA7700: N ch, FA7701: P ch). The maximum peak current of the output stage is a sink current of +150mA, and a source current of –400mA. The IC can also drive NPN, and PNP transistors. The maximum peak current in such cases is ±50mA. Be sure to design the output current considering the rating of power dissipation. 9. Power good signal circuit/ Undervoltage lockout circuit The IC contains a protection circuit against undervoltage malfunctions to protect the circuit from the damage caused by malfunctions when the supply voltage drops. When the supply voltage rises from 0V, the circuit starts to operate at VCC of 2.07V (typ.) and outputs generate pulses. If a drop of the supply voltage occurs, it stops output at VCC of 1.93V (typ.). when it occurs, the CS terminal is turned to Low level and then it is reset. The power good signal circuit monitors the voltage of REF terminal, and stops output until the voltage of REF terminal excesses approximately 2V to prevent malfunctions. I Design advice 1. Setting the oscillation frequency As described in item 2 “Oscillator” of “Description of each circuit”, a desired oscillation frequency can be determined by the value of the resistor connected to the RT terminal. When designing an oscillation frequency, you can set any frequency between 50kHz and 1MHz. Y ou can roughly obtain the oscillation frequency from the characteristic curve “Oscillation frequency (fosc) vs. timing resistor resistance(R T)” or the value can be calculated by the following expression. fOSC : Oscillation frequency [kHz] RT: Timing resistor [kΩ ] This expression, however, can be used for rough calculation, the value obtained is not guaranteed. The operation frequency varies due to the conditions such as tolerance of the characteristics of the ICs, influence of noises, or external discrete components. When determining the values, be sure to verify the effectiveness of the values of the components in an actual circuit. 2. Operation around the maximum or the minimum output duties As described in characteristic curves on page 5, “output duty cycle vs. FB terminal voltage (V FB )” and “output duty cycle vs. CS terminal voltage (Vcs)”, the linearity of the output duty of this IC drops around the minimum output duty and the maximum output duty (FA7701 only). This phenomena are conspicuous when operating in a high frequency (when the pulse width is narrow). Therefore be careful when using high frequency. 3. Restriction of external discrete components To achieve a stable operation of the ICs, the value of external discrete components connected to Vcc, R EF , CS, FB terminals should be within the recommended operational conditions. 4. Loss calculation Since it is difficult to measure IC loss directly, the calculation to obtain the approximate loss of the IC connected directly to a MOSFET is described below. When the supply voltage is Vcc, the current consumption of the IC is Icc, the total input gate charge of the driven MOSFET is Qg, the switching frequency is fsw, the total loss Pd of the IC can be calculated by: Pd /H11340 Vcc /H11003 (Icc + Qg /H11003 fsw). The values in this expression is influenced by the effects of the dependency of supply voltage, the characteristics of temperature, or tolerance. Therefore, be sure to verify appropriateness of the value considering the factors above under all applicable conditions. Example: When V CC = 6V, in the case of a typical IC, from the characteristic curve, Icc=1.2mA. When operating in Qg = 6nC, fsw = 500kHz, Pd should be: Pd /H11340 6 /H11003 (1.2mA + 6nC /H11003 500kHz) /H11340 25.2mW f OSC = 3000 /H11003 RT –0.9 RT = 3000 1.11 fOSC()

FA7700V, FA7701V I Application circuit

FA7700 ON /OFF FA7700 RT REF IN- FB 1 2 3 4 8 7 6 5 GNDOUTVCCCS Vout 12V/0.2A Vin 2.5~11V ON /OFF FA7700 RT REF IN- FB 1 2 3 4 8 7 65 GNDOUTVCCCS VoutVin

FA7700V, FA7701V I Application circuit

FA7701 Parts tolerances characteristics are not defined in the circuit design sample shown above. When designing an actual circuit for a product, you must determine parts tolerances and characteristics for safe and economical operation. FA7701 RT REF IN- FB 1 2 3 4 8 7 65 GNDOUTVCCCS ON /OFF Vin 7~18V Vout 5V/0.5A

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Overview

FA7701V is listed in the Interface category. Available datasheets include documents from Fuji Electric. DigiCamel provides a local PDF and searchable HTML technical text for online reference.

Summary

For Switching Power Supply Control

Description

FA7700V/FA7701V are the PWM type DC to DC converter control ICs with 1ch output that can directly drive power MOSFETs. CMOS devices with high breakdown voltage are used in these ICs and low power consumption is achieved. These ICs have the many functions equivalent to those which our conventional version bipolar ICs – FA76XX series- have,and have merits of output ON/OFF control function,directly driving Nch/Pch MOSFETs,low power consumption , higher frequency operation, and less external discrete components.

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