LD7592

06/05/2017

12

Leadtrend Technology Corporation

www.leadtrend.com.tw

LD7592-DS-00 June 2017

VCSA

t

t

OUT

IL

t

ZCD

SNS

CSA

I

R

V



ON

ON

OFF

OFF

ZCD

ZCD

Fig. 15

Fault Protection

There are several critical protections integrated in the

LD7592 to prevent the power supply or adapter from

being damaged. Those damages usually come from open

or short condition on the pins of LD7592.

Under the conditions listed below, the gate output will turn

off immediately to protect the power circuit:

1.

Ramp pin short to ground

2.

Ramp pin floating

3.

CS pin floating

GND Layout Suggestion

LD7592 GND layout suggestion is shown in Fig.16.

The LD7592 current sense loop is very important for the

stable operation.

The following are GND layout suggestion for LD7592:

1.

The current sense loop path should be minimized, as

shown in Fig.16 (red line loop).

2.

The current sense resistor RCS should be placed

close to IC GND.

3.

The VCC capacitor CVCC should be placed close to

VCC pin.

4.

Signal ground will be separated, as shown in Fig.16

(green area).

RCS

LD7592

VCC

OUT

GND

OVP

CS

COMP

RAMP

INV

RSNS

AC

Input

EMI

Filter

CVCC

Fig. 16