KA3511BS

4

Pin Number

Pin Name

Pin Function Descrition

°C at test.

2COMP

Error amplifier output. It is connect to non-inverting input of pulse width modulator

comparator.

3

E/A(-)

Error amplifier inverting input. Its reference voltage is always 1.25V.

4E/A(+)

Error amplifier non-inverting input feedback voltage.This pin may be used to sense

power supply output voltage.

5TREM

Remote on/off delay. Ton/Toff=8ms/24ms (Typ.) with C=0.1uF. Its high/low threshold

voltage is 1.8V/0.6V.

6REM

Remote on/off input. It is TTL operation and its threshold voltage is 1.4V. Voltage at

this pin can reach normal 4.6V, with absolutely maximum voltage, 5.25V. If REM =

“Low”,

PWM = “Low”. That means the main SMPS is operational. When REM = “High”, then

PWM = “High” and the main SMPS is turned-off.

7

RT

Ω)

8

CT

9

DET

Under-voltage detect pin. Its threshold voltage is 1.25V Typ.

10

0.6V and the voltage of Pin10 is clamped at 2.9V for noise margin.

11

PG

Power good output signal. PG = “High” means that the power is “Good” for operation

and PG = “Low” means “Power fail”.

14

Vref

Precision voltage reference trimmed to 2%. (Typical Value = 5.03V)

15

V3.3

Over voltage protection for output 3.3V. (Typical Value = 4.1V)

16

V5

Over voltage protection for output 5V. (Typical Value = 6.2V)

17

V12

Over voltage protection for output 12V. (Typical Value = 14.2V)

18

PT

This is prepared for an extra OVP input or another protection signal.

(Typical Value = 1.25V)

19

Timing pin for under voltage protection blank-out time. Its threshold voltage is 1.8V

and clamped at 2.9V after full charging. Target of delay time is 250ms and it is

realized through external (C=2.2uF).

20

GND

Signal ground.

21

DTC

Deadtime control input. The dead-time control comparator has an effective 120mV

input offset which limits the minimum output dead time. Dead time may be imposed

on the output by setting the dead time control input to a fixed voltage, ranging

between 0V to 3.3V.

22

C2

Output drive pin for push-pull operation.

23

E

Power ground.

24

C1

Output drive pin for push-pull operation.