CALLM FA7617CP, FA7612CN, FA7610CP, FA7610CN, FA7617CN Datasheet

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

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
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

µ

A

Item Symbol Test condition FA7610C FA7612C/17C Unit

Min. Typ. Max. Min. Typ. Max.

H-level output voltage (Pin 4) VOH RL = 10kΩ 3.54.0 ———V
L-level output voltage (Pin 4) VOL Output sink 0.25 0.65 0.9 1.5 V

Output source current (Pin 4) ISOURCE Pin 4 = 0V 8 11 14 ———mA

current = 20mA

Overall device

Item Symbol Test condition FA7610C FA7612C/17C Unit

Min. Typ. Max. Min. Typ. Max.

Supply current ICC LA Latch mode 1.6 2.2 1.5 2.2 mA
Operating-state supply current ICC AV RL = ∞ 2.6 3.8 1.8 3.0 mA

Duty cycle = 50%

4

FA7610CP(N)/FA7612CP(N)/FA7617CP(N)

■ Characteristic curves (Ta = 25°C)

Oscillation frequency(fOSC) vs. Output duty cycle vs. CS terminal voltage(VCS)
timing capacitor capacitance(C

Output source current (Isource) vs. L-level output voltage(VOL) vs. output sink current
supply voltage(V

CC)(ISINK)

T)

Supply current(ICC) vs. supply voltage(VCC) Error amplifier frequency(f) vs. voltage gain(AV) / phase (θ)

5

FA7610CP(N)/FA7612CP(N)/FA7617CP(N)

■ Application circuit
Á FA7610CP(N)

Flyback-transformer type converter circuit

Á FA7612CP(N)

Chopper type buck converter circuit

6

Á FA7617CP(N)

Flyback-transformer type converter circuit

FA7610CP(N)/FA7612CP(N)/FA7617CP(N)

VCC

0.52V

2.5V

0.01µ

VREF

U.V.L.O

36k

87

OSC.

+

ER.

AMP

12

0.01µ

330k

1000p

+
+

+

+

PWM

6

S.C.P

3

2.2k

180k

30µA

OFF

OFF

4.7µ

+

L.O

VCC

R2

+

3

R

5

TR

4

1k

Q1

+5V

+

–5V

+

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 0.01µF to 0.1µF,
between VCC and REF terminals in order to prevent from irregular
output pulse at start up.

18.75k

7