L8532

Preliminary

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

3 of 8

www.unisonic.com.tw

QW-R125-041..a

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PIN CONFIGURATION

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PIN DESCRIPTION

PIN NO.

PIN NAME

DESCRIPTION

1

MFP

The multi-function pin is connected to the internal error amplifier. By pulling this pin below

comparator which will disable the controller in the event of a fault.

2

COMP

The COMP pin is the output of the internal error amplifier. A compensation network is

connected between this pin and ground to set the loop bandwidth. Normally this

bandwidth is set at a low frequency (typically 10Hz~20Hz) to achieve high power factor

and low total harmonic distortion (THD).

3

CT

end of the on time cycle.

4

CS

The CS input is used to sense the instantaneous switch current in the external MOSFET.

This signal is filtered by an internal leading edge blanking circuit.

5

ZCD

The voltage of an auxiliary zero current detection winding is sensed at this pin. When the

ZCD control block circuit detects that the winding has been demagnetized, a control

signal is sent to the gate drive block to turn on the external MOSFET.

6

GND

This is the analog ground for the device. All bypassing components should be connected

to the GND pin with a short trace length.

7

DRV

The high current capability of the totem pole gate drive (+0.5/-0.8 A) makes it suitable to

effectively drive high gate charge power MOSFETs. The driver stage provides both

passive and active pull down circuits that force the output to a voltage less than the

8

After startup, the operating range is 10.2V up to 20V.