FA7610CN

FA7610CP FUJI | Alldatasheet

Document overview

• Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 7

Technical content

FA7610CP(N)/FA7612CP(N)/FA7617CP(N) n Description The FA7610CP(N), 7612CP(N) and 7617CP(N) are bipolar ICs containing basic circuits necessary for PWM-type switching power supply control. To minimize the number of external discrete components, the FA7610CP(N) is provided for a flyback or step-up power- supply circuit, the FA7612CP(N) for a step-down power-supply circuit and FA7617CP(N) for a flyback power supply circuit. n Features FA7610CP(N)

• For flyback transformer-type or step-up power-supply circuit (maximum output duty = 64% typical)
• Totem-pole predriver
• PWM-type switching power supply control
• Low-voltage operation (V CC = 3.6 to 22V)
• Latch-mode short-circuit protection function (no malfunction by noise)
• Soft-start function
• Undervoltage lockout function
• One capacitor shared for short circuit protection and for soft- start to minimize the number of external discrete components FA7612CP(N)
• For step-down power-supply circuit (maximum output duty = up to 100%)
• Open collector output
• PWM-type switching power supply control
• Low-voltage operation (V CC = 3.6 to 22V)
• Latch-mode short-circuit protection function (no malfunction by noise)
• Soft-start function
• Undervoltage lockout function
• One capacitor shared for short circuit protection and for soft- start to minimize the number of external discrete components FA7617CP(N)
• For flyback transformer-type power-supply circuit (maximum output duty = 67% typical)
• Open collector output
• PWM-type switching power supply control
• Low-voltage operation (V CC = 3.6 to 22V)
• Latch-mode short-circuit protection function (no malfunction by noise)
• Soft-start function
• Undervoltage lockout function
• One capacitor shared for short circuit protection and for soft- start to minimize the number of external discrete components n Applications
• Battery power supply for portable equipment n Dimensions, mm \ SOP-8 4.9 3.9 6.0–0.2 0.4–0.1 1.27–0.2 0.20 +0.1 –0.05 0~8 1 4 8 5 1.7max \ DIP-8 Bipolar IC For Switching Power Supply ControlFA7610CP(N)/12CP(N)/17CP(N) 8 5 49.3 6.5 7.6 3.4 4.5max 1.5 3.0min 0.3 +0.1 –0.05

FA7610CP(N)/FA7612CP(N)/FA7617CP(N) n Block diagram \ FA7610CP(N) \ FA7612CP(N) \` FA7617CP(N) Pin Pin Description No. symbol

1 IN (–) Inverting input to error amplifier

2 FB Error amplifier output

3 GND Ground

4 OUT Output

5 VCC Power supply

6 CS Capacitor for soft-start, short-circuit protection and delay

7 CT Oscillator timing capacitor

8 REF Reference voltage output (2.5V) Pin Pin Description No. symbol 8 REF Reference voltage output (2.5V) Pin Pin Description No. symbol 8 REF Reference voltage output (2.5V)

FA7610CP(N)/FA7612CP(N)/FA7617CP(N) n Absolute maximum ratings (Ta = 25°C) Item Symbol Rating Unit FA7610C FA7612C/17C Supply voltage VCC 22 22 V Reference voltage output current IOR 55m A Output current IO –50 80 mA Total power dissipation Pd 400 400 mW Operating temperature Topr –20 to +85 –20 to +85 °C Storage temperature Tstg –40 to +150 –40 to +150 °C n Recommended operating conditions Item Symbol FA7610C FA7612/17C Unit Min. Max. Min. Max. Supply voltage VCC 3.6 20 3.6 20 V Feedback resistance R NF 100 100 k W Oscillator timing capacitor C T 220 22,000 220 22,000 pF Oscillator timing resistance R T 10 100 10 100 k W Oscillation frequency fOSC 5 200 5 500 kHz n Electrical characteristics (Ta = 25°C, VCC = 6V, RT = 33kW , CT = 1000pF) Reference voltage section Common to FA7610C/12C/17C Item Symbol Test condition Min. Typ. Max. Unit Output voltage VREF IOR = 1mA 2.528 2.580 2.632 V Line regulation LINE VCC = 3.6 to 20V, IOR = 1mA 4 12 mV Load regulation LOAD IOR = 0.1 to 1mA 1 6 mV Output voltage variation due to temperature changeVTC1 Ta = –20 to +25°C– 1 1 % VTC2 Ta = +25 to +85°C– 1 1 % Oscillator sectionCommon to FA7610C/12C/17C Item Symbol Test condition Min. Typ. Max. Unit Oscillation frequency fOSC C T = 1000pF, R T = 33kW 100 111 122 kHz Frequency variation 1 (due to supply voltage change)fdV VCC = 3.6 to 20V 1 % Frequency variation 2 (due to temperature change) fdT Ta = –20 to +85°C5 % Error amplifier sectionCommon to FA7610C/12C/17C Item Symbol Test condition Min. Typ. Max. Unit Reference voltage VB 0.515 0.525 0.535 V Input bias current IB 5 100 nA Open-loop voltage gain AV 70 dB Unity-gain bandwidth G B 0.6 MHz Maximam output voltage (Pin 2) VOM+ R NF = 100kW VREF –0.2 V VOM– R NF = 100kW 200 mV Output source current (Pin 2) IOM+ VOM = 1V 40 85 200 mA PWM comparator section Item Symbol Test condition FA7610C FA7612C FA7617C Unit Input threshold voltage (pin 2)VTH50 Duty cycle = 50% 1.1 1.1 1.1 V Maximum duty cycle a M (Pin 2 = 1.2V) 58 64 75 100 63 67 71 %

FA7610CP(N)/FA7612CP(N)/FA7617CP(N) Soft-start circuit section Common to FA7610C/12C/17C Item Symbol Test condition Min. Typ. Max. Unit Input bias current (Pin 6) IBCS 80 300 nA Input threshold voltage (Pin 6) VTH CS0 Duty cycle = 0% 0.22 0.32 V Input threshold voltage (Pin 6) VTH CS50 Duty cycle = 50% 0.46 V Short-circuit protection circuit section Common to FA7610C/12C/17C Item Symbol Test condition Min. Typ. Max. Unit Input threshold voltage (Pin 2) VTH PC 1.20 1.50 1.80 V Charge current (Pin 6) ICHG Pin 6 = 0V, Pin 2 = 2V 20 30 40 mA Latch-mode threshold voltage (Pin 6) VTH LA 1.20 1.50 1.80 V Undervoltage lockout circuit section Common to FA7610C/12C/17C Item Symbol Test condition Min. Typ. Max. Unit OFF-to-ON threshold voltage VTH ON 2.70 V ON-to-OFF threshold voltage VTH OFF 2.52 V Voltage hysteresis VHYS 60 180 mV Output section Item Symbol Test condition FA7610C FA7612C/17C Unit H-level output voltage (Pin 4) VOH R L = 10kW 3 . 5 4 . 0 ———V L-level output voltage (Pin 4) VOL Output sink 0.25 0.65 0.9 1.5 V current = 20mA Output source current (Pin 4) ISOURCE Pin 4 = 0V 8 11 14 ———m A Overall device Item Symbol Test condition FA7610C FA7612C/17C Unit Supply current ICC LA Latch mode 1.6 2.2 1.5 2.2 mA Operating-state supply current ICC AV R L = ¥ 2.6 3.8 1.8 3.0 mA Duty cycle = 50%

FA7610CP(N)/FA7612CP(N)/FA7617CP(N) n Characteristic curves (Ta = 25°C) Oscillation frequency(fOSC ) vs. Output duty cycle vs. CS terminal voltage(V CS ) timing capacitor capacitance(CT) Output source current (Isource) vs. L-level output voltage(V OL ) vs. output sink current supply voltage(VCC )( I SINK ) Supply current(ICC ) vs. supply voltage(VCC ) Error amplifier frequency(f) vs. voltage gain(AV) / phase ( q)

FA7610CP(N)/FA7612CP(N)/FA7617CP(N) n Application circuit \ FA7610CP(N) Flyback-transformer type converter circuit \ FA7612CP(N) Chopper type buck converter circuit

FA7610CP(N)/FA7612CP(N)/FA7617CP(N) \` FA7617CP(N) Flyback-transformer type converter circuit VCC VREF ER. AMP PWM OFF OFF 30µA 4.7µ S.C.P L.O R 3 Q 1 R 2 2.2k 18.75k –5V +5V TR VCC 0.01µ U.V.L.O OSC. 36k 330k 180k2.5V 1000p 87 6 5 12 3 4 0.01µ 0.52V 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. Please connect a capacitor, which the value is about 0.01mF to 0.1mF, between VCC and REF terminals in order to prevent from irregular output pulse at start up.