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AS2916

PWM Controller

Pin Function Description

Pin Number

Function

Description

12

CMPA

This is the Auxiliary convertor error amplifier compensation pin

or if secondary controller is desired, the Auxiliary control input

pin. A simple capacitor to ground is the only circuitry expected.

Note: There is no external connection for voltage feedback.

Voltage sensing is provided internally in such a way that VCC

is

not loaded until it reaches predefined threshold. If secondary

control is required, it can be forced into the CMPA pin.

13

SNSA

This is the Auxiliary convertor current sense pin. An external

RC filter from the Auxiliary power FET and slope compensation

resistor from the RAMP pin is all the expected external cir-

cuitry.

14

OUTA

This is the gate drive output for the Auxiliary FET. The totem

pole output has equivalent of an extra 33

Ω resistor to limit the

FET turn on speed and a pull down resistor to ensure the FET

gate is never open. No external circuitry except for the FET is

expected on this pin. The largest FET expected to be driven is

IRF820. If a larger power FET is used, a buffer might be

required.

15

GND

Signal ground.

16

PGND

Power ground.

Absolute Maximum Ratings

Parameter

Symbol

Rating

Unit

Reference Current

IREF

200

mA

Output Current

IOUT

1A

Supply Voltage

VCC

20

V

Output Voltage

VOUT

20

V

Continuous Power

PD

500

mW

Junction Temperature

TJ

150

°C

Storage Temperature

TSTG

–60 to +150

°C

Lead Temperature (Soldering, 10 seconds)

TL

300

°C