AMC3202DMF

BLOCK DIAGRAM AND PI N CONFIGURATION

PIN DESCRIPTION

Pin No.

Pin Name

Pin Function

1

COMP

Loop compensation pin. This pin is the output of the error amplifier and

is used for loop compensation.Loop compensation can be implemented

by a simple RC network.

2

FB

Feedback pin. Sense the output voltage and referenced to 1.276V.

When

the

voltage

at

this

pin

falls

below

0.4V,chip

switching-frequency reduces to a much lower frequency.

3

NC

No connection.Keep floating.

4

EN

Enable pin. A TTL low will shut down the chip and high enable the

chip. This pin may also be used to synchronize the part to nearly

twice the base frequency. If synchronization is not used, this pin

should be either tied high or left floating for normal operation.

5

Vcc

Input power supply pin. Supply power to the IC and should have a

bypass capacitor connected to AGND

6

AGND

Analog ground. Provide a clean ground for the controller circuitry

and should not be in the path of large currents.This pin is connected

to the IC substrate.

7

PGND

Power ground. This pin is the ground connection for the emitter of

the power switching transistor.Connection to a good ground plane is

essential.

8

Vsw

High current switch pin. Connect to the collector of the internal

power switch. The open voltage across the power switch can be as

high as 40V. To minimize radiation, use a trace as short as practical.

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