RT7304

2

DS7304-04 February 2015

www.richtek.com

©

Copyright 2015 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

GND

Ground of the Controller.

2

VDD

3

GD

Gate Driver Output for External Power MOSFET.

4

CS

Current Sense Input. Connect this pin to the current sense resistor.

5

ZCD

Zero Current Detection Input. This pin is used to sense the voltage at auxiliary winding of

the transformer.

6

COMP

Compensation Node. Output of the internal trans-conductance amplifier.

Function Block Diagram

Ordering Information

Note :

Richtek products are :



RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.



Suitable for use in SnPb or Pb-free soldering processes.

Pin Configurations

(TOP VIEW)

SOT-23-6

GND VDD GD

COMP ZCD CS

4

23

5

6

RT7304

Package Type

E : SOT-23-6

Lead Plating System

G : Green (Halogen Free and Pb Free)

Starter

Circuit

Output Diode

Short Circuit

Protection

COMP

Under

Voltage

Lockout

(16V/9V)

VDD Over

Voltage

Protection

ZCD

CS

GD

VDD

GND

PWM

Control

Logic

Gate

Driver

VDD OVP

PWM

+

-

+

-

Constant On-Time

Comparator

Current Limit

Comparator

1V

Over

Temperature

Protection

OTP

Ramp

Generator

Constant Current Control

Valley

Detector

Clamping

Circuit

Output Over

Voltage

Protection

Leading

Edge

Blanking

Output OVP