Datasheet FA5301BP, FA5301BN Datasheet (CALLM)

FA5301BP(N)

1

FA5301BP(N)

■ Description

The FA5301BP(N) is a bipolar IC containing basic circuits
necessary for PWM-type switching power supply control.
This IC switches an external transistor according to external

synchronizing pulses.

■ Features

• External synchronization input terminal

• Wide supply voltage range (V

CC =7 to 22V)

• Open-collector output

• Soft-start from standby mode

• Double protection of output transistor by overcurrent limiting
and cutoff functions

• Output ON/OFF control function

• Not many external discrete components needed

■ Applications

• Switching power supply for general equipment
(Optimum for TV, display, and other monitor devices)

■ Dimensions, mm

Á SOP-16

Á DIP-16

■ Block diagram

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

Bipolar IC

For Switching Power Supply Control

1

8

9

16

0.65

0.33

0~8˚

1.27

±0.2

6.0

±0.2

3.9

±0.1

1.65

±0.1

0.18

±0.07

0.42

±0.07

9.9

±0.1

0.2

Pin Pin Description
No. symbol

1 IN (–) Inverting input to error amplifier
2 IN (+) Non-inverting input to error

amplifier

3 ER.OUT Error amplifier output
4 FB Feedback input
5 IS Overcurrent detection
6 CD Overcurrent cutoff delay

capacitor

7 GND Ground
8 ON/OFF Output ON/OFF control
9 OUT Output
10 DT Dead time adjustment
11 CT Oscillator timing capacitor
12 CSY External synchronizing signal

detection capacitor

13 SYNC External synchronization input
14 CSO PWM soft-start capacitor
15 REF Reference voltage output (5V)
16 VCC Power supply

FA5301BP(N)

2

■ Absolute maximum ratings

Item Symbol Rating Unit

VCC 22 V
VO 22 V
IOM 5mA

VI 5V

VIS 20 V
VFB 20 V

VON/OFF 6V
VSYNC 6V
Pd 1000 (DIP-16) *

1

mW

400 (SOP-16) *

2

Topr –20 to +85 °C
Tstg –40 to +150 °C

Supply voltage
Output voltage
Error amplifier output

current
Error amplifier input

voltage
Overcurrent detection

terminal input voltage
Feedback terminal input voltage
Output ON/OFF terminal

input voltage
Synchronizing terminal

input voltage
Total power dissipation

Operating temperature
Storage temperature

Notes:
*

1 Derating factor Ta > 25°C : 10.0mW/°C (on PC board)

*

2 Derating factor Ta > 25°C : 4.0mW/°C (on PC board)

■ Recommended operating conditions

Item Symbol Min. Max. Unit

Supply voltage VCC 720 V
Error amplifier input voltage VI 0 VREF-2 V
Output current IO 20 mA
Error amplifier feedback resistor

RNF 33 kΩ

Oscillator timing capacitor CT 100 10,000 pF
Oscillator timing resistor RT 8.2 220 kΩ
Free run oscillation frequency fOSC 1 200 kHz
Synchronized frequency fSYNC 1 200 kHz
Frequency ratio CSY=OV –35 –5 %

fOSC – fSYNC *

3

fSYNC

–30 +10 %

CSY:

Capacitor

is connected
to GND

*

3 Consider the tolerance of

fosc – f

SYNC

fSYNC

■ Electrical characteristics (Ta = 25°C, VCC = 9V, RT = 47kΩ, CT = 1000pF)
Reference voltage section

Item Symbol Test condition Min. Typ. Max. Unit

Output voltage VREF IOR = 1mA 4.75 5.00 5.25 V
Line regulation LINE VCC = 8 to 20V 10 25 mV
Load current regulation LOAD IOR = 0.1 to 2mA 10 25 mV
Output voltage variation by temperature fluctuation VTC1 Ta = –20 to +25°C1%

VTC2 Ta = +25 to +85°C1%

Output current at output short-circuit IOS 25 mA

Oscillator section

Item Symbol Test condition Min. Typ. Max. Unit

Oscillation frequency fOSC CT = 1,000pF, RT = 47kΩ 20 21 22 kHz
Frequency variation by line voltage fluctuation fdV VCC = 8 to 20V 2 %
Frequency variation by temperature fluctuation fdt1 Ta = +25 to –20°C–2 +2%

fdt2 Ta = +25 to +85°C–2 +2%

Input current to synchronizing signal terminal ISYNC1 VSYNC = 1V 300 600

µ

A

ISYNC2 VSYNC = –0.5V –60 –300

µ

A

Input current to synchronizing signal detection terminal ICSY1 Pin 12 = 0V, VSYNC = –0.5V –65 –130 –260

µ

A

ICSY2 Pin 12 = 1V, VSYNC = 1V 200 400

µ

A

Threshold voltage of synchronizing signal detection terminal VTH CSY 0.7 1.0 V

Error amplifier section

Item Symbol Test condition Min. Typ. Max. Unit

Input offset voltage VIO –10 10 mV
Input bias current II 1

µ

A

Common-mode input voltage VCM 0 VREF–2 V
Open-loop voltage gain AV 70 95 dB
Unity-gain bandwidth GB 0.8 MHz
Common-mode signal rejection ratio CMRR 80 dB
Maximum output voltage VOM+ IOM = –50µA4V

VOM– IOM = 50

µ

A 0.5 V

Output sink current IOM– VOM = 1V 170 240

µ

A

FA5301BP(N)

3

PWM comparator section

Item Symbol Test condition Min. Typ. Max. Unit

Input bias current (Pin 4) IBFB VFB = 1V –2.0 –10.0µA
Input threshold voltage (Pin 4) VTH0 Duty cycle = 0% 3.3 V

VTH100 Duty cycle = 100% 0.2 V

Soft-start signal pin input current ICSO Pin 14 = 3V, VFB = 0V 2.0 10.0

µ

A

Dead time adjustment circuit section

Item Symbol Test condition Min. Typ. Max. Unit

Input bias current IBDT Pin 10 = 1V –0.5 –5

µ

A

Input threshold voltage VTH DT0 Duty cycle = 0% 3.2 V

VTH DT100 Duty cycle = 100% 0.1 V

Reset saturation voltage VSAT RS Pin 10 = –100µA 0.25 0.8 V

Overcurrent limiting circuit section

Item Symbol Test condition Min. Typ. Max. Unit

Input bias current (Pin 5) IBIS VIS = 0.3V –1

µ

A

Input threshold voltage (Pin 5) VTH IS 0.5 0.6 0.7 V
Source current of overcurrent cutoff terminal IO CD Pin 6 = 0V, VIS = 1V –450 –700

µ

A

Latch-mode threshold voltage VTH LA 1.8 2.2 2.6 V
Reset saturation voltage (Pin 6) VSAT RS Pin 6 = 100µA, VIS = 0V 0.75 1.0 V

Output section

Item Symbol Test condition Min. Typ. Max. Unit

Output leakage current ILEAK VO = 22V, output OFF 10

µ

A

L-level output voltage VOL IO = 10mA 0.4 0.7 V
Output sink current limit ISINK VO = 3V 25 40 55 mA

Output ON/OFF control circuit section

Item Symbol Test condition Min. Typ. Max. Unit

Input bias current (Pin 8) IBON Pin 8 = 0V –60 –300

µ

A

OFF-to-ON threshold voltage VTH ON OFF→ON 2.13 2.50 2.87 V
ON-to-OFF threshold voltage VTH OFF ON→OFF 1.96 2.30 2.64 V
Voltage hysteresis VHYS 0.2 V

Overall device

Item Symbol Test condition Min. Typ. Max. Unit

Supply current ICC LA RT = 47kΩ, latch mode 8.0 12.0 mA
Operating-state supply current ICC AV

R

T

= 47kΩ, duty cycle = 50%

6.5 9.8 mA

FA5301BP(N)

4

■ Characteristic curves (Ta = 25°C)

Oscillation frequency (fOSC) vs. timing Output duty cycle vs. DT terminal voltage (VDT)
resistor resistance (R

T)

1

710 20 50

RT [kΩ]

100 200 500

2200pF

1500pF

1000pF

680pF

470pF

CT=100pF

10

5

100

50

fosc [kHz]

1000

500

Output duty cycle vs. FB terminal voltage (VFB) L-level output voltage vs. output sink current

(ISINK)

Supply current (ICC) vs. supply voltage (VCC)

Error amplifier frequency (f) vs.voltage gain(Av)/ phase (θ)

FA5301BP(N)

5

■ Application circuit

Á Switching power supply (primary current control and insulated output type)

This circuit uses the following functions.

• Horizontal synchronizing function

• Overcurrent limiting function

• Overcurrent cutoff function

• Undervoltage input cutoff function

• Soft-start function

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.