CALLM FA7617CP, FA7612CN, FA7610CP, FA7610CN, FA7617CN Datasheet
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F A7610CP(N)/12CP(N)/17CP(N)
FA7610CP(N)/FA7612CP(N)/FA7617CP(N)
Bipolar IC
For Switching Power Supply Control
■ 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 powersupply circuit, the FA7612CP(N) for a step-down power-supply
circuit and FA7617CP(N) for a flyback power supply circuit.
■ 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
• 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 softstart 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
• 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 softstart to minimize the number of external discrete components
CC = 3.6 to 22V)
CC = 3.6 to 22V)
■ Dimensions, mm
Á SOP-8
4.9
1.27
5
4
±0.2
0.4
8
1
±0.1
Á DIP-8
±0.25
9.3
1.5
0.5
5
4
±0.1
8
1
2.54
3.9
6.5
3.4
±0.2
6.0
+0.1
0~8°
4.5max
3.0min
0~15˚
–0.05
0.20
7.6
0~15˚
0.3
+0.1
–0.05
1.7max
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 softstart to minimize the number of external discrete components
■ Applications
• Battery power supply for portable equipment
1
FA7610CP(N)/FA7612CP(N)/FA7617CP(N)
■ Block diagram
Á FA7610CP(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
7 CT Oscillator timing capacitor
8 REF Reference voltage output (2.5V)
Capacitor for soft-start, short-circuit protection and delay
Á FA7612CP(N)
Á 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
7 CT Oscillator timing capacitor
8 REF Reference voltage output (2.5V)
Capacitor for soft-start, short-circuit protection and delay
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
7 CT Oscillator timing capacitor
8 REF Reference voltage output (2.5V)
Capacitor for soft-start, short-circuit protection and delay
2
FA7610CP(N)/FA7612CP(N)/FA7617CP(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 55mA
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
■ 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 RNF 100 100 kΩ
Oscillator timing capacitor CT 220 22,000 220 22,000 pF
Oscillator timing resistance RT 10 100 10 100 kΩ
Oscillation frequency fOSC 5 200 5 500 kHz
■ Electrical characteristics (Ta = 25°C, VCC = 6V, RT = 33kΩ, 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 change VTC1 Ta = –20 to +25°C–1 1%
VTC2 Ta = +25 to +85°C–1 1%
Oscillator section Common to FA7610C/12C/17C
Item Symbol Test condition Min. Typ. Max. Unit
Oscillation frequency fOSC CT = 1000pF, RT = 33kΩ 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 section Common 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 GB 0.6 MHz
Maximam output voltage (Pin 2) VOM+ RNF = 100kΩ
VOM– RNF = 100kΩ 200 mV
Output source current (Pin 2) IOM+ VOM = 1V 40 85 200
V
REF
–0.2
V
µ
A
PWM comparator section
Item Symbol Test condition FA7610C FA7612C FA7617C Unit
Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.
Input threshold voltage (pin 2) VTH0 Duty cycle = 0% 0.85 0.95 0.85 0.95 0.85 0.95 V
Input threshold voltage (pin 2) VTH50 Duty cycle = 50% 1.1 1.1 1.1 V
Maximum duty cycle αM (Pin 2 = 1.2V) 58 64 75 100 63 67 71 %
3
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