Datasheet FA7613CE, FA7613CP Datasheet (CALLM)

FA7613CP(E)

1

■ Description

The FA7613CP(E) is a bipolar IC containing basic circuit
necessary for PWM-type switching power supply control. The
supply voltage range is from 2.5V.

■ Features

• Low-voltage operation (VCC = 2.5 to 22V)

• Open collector output

• Latch-mode short-circuit protection function (no malfunction
due to electrical noise)

• Soft-strat function

• Output ON/OFF control function

• Low standby current (Max. 10µA)

• Not many external discrete components needed

■ Applications

• Battery power supply for portable equipment

■ Dimensions, mm

Á SSOP-16

1

8

9

16

0.6

0~10˚

0.65

7.9

±0.3

5.3

6.2

0.1

±0.1

0.2

+0.1

–0.05

0.3

2.1max

Á DIP-16

Bipolar IC

For Switching Power Supply Control

■ Block diagram

FA7613CP(E)

Pin Pin Description
No. symbol

1 NC —
2 REF Reference voltage

output(1.25V)

3 IN (+) Non-inverting input to error

amplifier

4 IN (–) Inverting input to error amplifier
5 FB Error amplifier output
6 DT Dead time adjustment
7 GND Ground
8 NC —
9 NC —
10 OUT Output
11 VCC Power supply
12 SCP Capacitor for short-circuit

protection and delay

13 CT Oscillator timing capacitor
14 RT Oscillator timing resistance
15 ON/OFF Output ON/OFF control
16 NC —

1

16

9

8

19.4

6.5

7.6

3.4

4.3max

1.5

0.81

3.1min

0.2min

0~15˚

0~15˚

0.5

±0.1

2.54

±0.25

0.3

+0.1

–0.05

FA7613CP(E)

2

■ Electrical characteristics (Ta = 25°C, VCC = 5V, fOSC = 100kHz)
Reference voltage section

Item Symbol Test condition Min. Typ. Max. Unit

Output voltage VREF IOR = 1mA 1.210 1.235 1.260 V
Line regulation LINE VCC = 2.5 to 20V 1 5 mV
Load regulation LOAD IOR = 0.1 to 1mA 5 10 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

Item Symbol Test condition Min. Typ. Max. Unit

Oscillation frequency fOSC CT = 1000pF, RT = 4.7kΩ 120 140 160 kHz
Frequency variation 1 (due to supply voltage change) fdV VCC = 2.5 to 20V 2 %
Frequency variation 2 (due to temperature change) fdT Ta = –20 to +85°C4%

Error amplifier section

Item Symbol Test condition Min. Typ. Max. Unit

Input bias current IB+ Pin 3 = 1.25V 0.1 1.0

µ

A

IB– Pin 4 = 1.25V 0.1 1.0

µ

A

Open-loop voltage gain AV 70 dB
Unity-gain bandwidth GB 1.0 MHz
Maximum output voltage (Pin 5) VOM+ RNF = 200kΩ 4.8 V

VOM– RNF = 200kΩ 200 mV

Output source current (Pin 5) IOM+ VOM = 1V 25 50 100

µ

A

PWM comparator section

Item Symbol Test condition Min. Typ. Max. Unit

Input threshold voltage (Pin 5) VTH0 Duty cycle = 0% 0.80 0.90 V
Input threshold voltage (Pin 5) VTH50 Duty cycle = 50% 1.13 V

■ Absolute maximum ratings

Item Symbol Rating Unit

Supply voltage VCC 22 V
Reference voltage output current

IOR 5mA

Output sink current ISINK 50 mA
Total power dissipation Pd 400 mW
Operating temperature Topr –20 to +85 °C
Storage temperature Tstg –40 to +150 °C

■ Recommended operating conditions

Item Symbol Min. Max. Unit

Supply voltage VCC 2.5 20 V
Feedback resistance RNF 100 kΩ
Oscillator timing capacitor CT 220 22,000 pF
Oscillator timing resistance RT 4.7 100 kΩ
Oscillation frequency fOSC 10 500 kHz

FA7613CP(E)

3

Dead time adjustment circuit section

Item Symbol Test condition Min. Typ. Max. Unit

Input bias current(Pin 6) IBDT 0.3 1.0

µ

A

Input threshold voltage (Pin 6) VTH DT0 Duty cycle = 0% 0.10 0.20 V
Input threshold voltage (Pin 6) VTH DT50 Duty cycle = 50% 0.47 V

Short-circuit protection circuit section

Item Symbol Test condition Min. Typ. Max. Unit

Input threshold voltage (Pin 5) VTH PC 2.05 2.35 2.65 V
Charge current (Pin 12) ICHG

Pin 12 = 0V, Pin 6, Pin 5 = 2V

15 35 55

µ

A

Latch-mode threshold voltage (Pin 12) V L 0.90 1.20 1.50 V

Output section

Item Symbol Test condition Min. Typ. Max. Unit

L-level output voltage (Pin 10) VOL

Output sink current = 20mA

1.0 1.5 V

Output ON/OFF circuit section

Item Symbol Test condition Min. Typ. Max. Unit

Input current (Pin 15) ION/OFF Pin 15 = 5V 0.5 1.0 2.0 mA
OFF-to-ON threshold voltage (Pin 15) VTH ON 0.6 0.8 1.0 V

Overall device

Item Symbol Test condition Min. Typ. Max. Unit

Standby current ICC ST Pin 15 = 0V 0.5 10

µ

A

Supply current ICC LA Latch mode 1.5 2.5 mA
Operating-state supply current ICC AV RL = ∞ Duty cycle = 50% 2.0 4.0 mA

■ Characteristic curves (Ta = 25°C)

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

T)

CT [pF] VDT [V]

Output duty cycle [%]

f

OSC

(kHz)

FA7613CP(E)

4

Output duty cycle vs. FB terminal voltage (VFB)

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

Output ON/OFF control terminal input current (ION/OFF) vs. voltage(VON/OFF)

L-level output voltage (V

OL) vs. output sink current (ISINK)

ION/OFF

[mA]

VON/OFF [V]

V

OL

[V]

FA7613CP(E)

5

■ Application circuit

Á Flyback-transformer type converter circuit

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.