LD5525GL datasheet(1/16 Pages) LEADTREND

Part #	LD5525GL

Description	Multi-Mode PWM Controller of Flyback with Integrated BNI/BNO and Protection

PDF	16 Pages

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Manufacturer	LEADTREND [Leadtrend Technology]

Direct Link	https://www.leadtrend.com.tw/

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LD5525

06/30/2015

1

Leadtrend Technology Corporation

www.leadtrend.com.tw

LD5525-DS-00 June 2015

Multi-Mode PWM Controller of Flyback with

Integrated BNI/BNO and Protection

REV. 00

General Description

In order to enhance the efficiency performance, the

LD5525 integrates the multi-mode PWM controller,

which consists of Quasi-Resonant (QR) PWM control for

light load condition and Continue Conduction Mode

(CCM) for heavy load condition. Moreover, the QR

controller not only gains the system performance, but

also brings the worse EMI capability, while the

frequency swapping function of LD5525 can reduce the

EMI emission of SMPS and helps the power circuit

designers to simply deal with EMI filter and saves

several component and developing time.

The LD5525 is implemented in SOT-26 package, and

includes the comprehensive protection function, such as

Over Load Protection (OLP), Over Voltage Protection

(OVP), Output Short Circuit Protection (OSCP) and

internal

Over

Temperature

Protection

(OTP).

Furthermore, the programmable Brown-in/out Protection

is built-in.

Features

 Secondary-side feedback control with

quasi-resonant operation

 Low Startup Current (<3

A)

 0.5mA Ultra-low operating current at light load

 Current Mode Control with Cycle-by-Cycle Current

Limit

 Green Mode Control

 UVLO (Under Voltage Lockout)

 LEB (Leading-Edge Blanking) on CS Pin

 VCC OVP (Over Voltage Protection)

 Adj. OVP (Over Voltage Protection) on FB pin.

 Adj. UVP (Under Voltage Protection) on FB pin.

 Adjustable Brown in/out on FB pin.

 OLP (Over Load Protection)

 External OTP (Over Temperature Protection) on

CS Pin

 Internal OTP (Over Temperature Protection)

 Gate Source/Sink Capability: 250mA/-500mA

Applications

 Switching AC/DC Adaptor

Typical Application

EMI

Filter

FB

OUT

CS

VCC

GND

COMP

LD5525

photocoupler

AC

input

DC

Output

NTC

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