LD5537

09/07/2015

2

Leadtrend Technology Corporation

www.leadtrend.com.tw

LD5537-DS-01 September 2015

Pin Configuration

SOT-26 (TOP VIEW)

YY, Y

: Year code (D: 2004, E: 2005

…..)

WW, W : Week code

PP

: Production code

t37

: LD5537

1

2

3

4

5

6

GND COMP BNO

OUT

VCC

CS

YWt

37

pp

Ordering Information

Part number

Package

Top Mark

Shipping

LD5537 GL

SOT-26

YWt/37

3000 /tape & reel

The LD5537 is ROHS compliant/ Green packaged

Protection Mode

Switching

Freq.

VCC OVP

BNO

OPP

OCP

OSCP

Int. OTP

CS Pin OVP

130kHz

Auto-Restart

Auto-Restart Auto-Restart Auto-Restart Auto-Restart Auto-Restart

Auto-Restart

Pin Descriptions

PIN

NAME

FUNCTION

1

GND

Ground

2

COMP

Voltage feedback pin (same as the COMP pin in UC384X). Connect a photo-coupler to

close the control loop and achieve the regulation.

3

BNO

Brownout Protection Pin. Connect a resistor divider between this pin and bulk

capacitor voltage to set the brownout level. If the voltage below the threshold, the

PWM output will be disabled.

4

CS

Current sense pin, connect it to sense the MOSFET current. This pin is also connected

to an auxiliary winding of the PWM transformer through a resistor and a diode for

output over-voltage protection.

5

VCC

Supply voltage pin

6

OUT

Gate drive output to drive the external MOSFET