LD5537B1/I1

12/18/2018

2

Leadtrend Technology Corporation

www.leadtrend.com.tw

LD5537B1/I1-DS-00 December 2018

Pin Configuration

Ordering Information

Part number

Package

Top Mark

Shipping

LD5537B1 GL

SOT-26

Yt b/ WB1

3000 / tape & reel

LD5537I1 GL

SOT-26

Yt b/ WI1

3000 / tape & reel

The LD5537B1/I1 is ROHS compliant / green packaged.

Protection Mode

Product

Name

Switching

Freq.

OLP

VCC OVP

CS OVP

OSCP

SDSP

BNO Pin

Int. OTP

LD5537B1

100kHz

Auto recovery Auto recovery Auto recovery Auto recovery Auto recovery Auto recovery Auto recovery

LD5537I1

100kHz

Latch

Latch

Latch

Latch

Latch

Auto recovery Auto recovery

Pin Descriptions

SOT-26

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 bridge

rectifier of AC input to set the brownout level. If the voltage is less than threshold

voltage, the PWM output will be disabled.

4

CS

Current sense pin, connect it to sense the MOSFET current.

5

VCC

Supply voltage pin

6

OUT

Gate drive output to drive the external MOSFET

SOT-26 (TOP VIEW)

Y

: Year code (D: 2004, E: 2005

…..)

W

: Week code

PP

: Production code

tbX1

: LD5537B1 & LD5537I1

1

2

3

4

5

6

GND COMP BNO

OUT

VCC

CS

WX1

Y t b pp