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RT7302GS PDF预览

RT7302GS

更新时间: 2024-01-10 20:15:28
品牌 Logo 应用领域
立锜 - RICHTEK /
页数 文件大小 规格书
15页 275K
描述
Primary-Side-Regulation Dimmable LED Driver Controller

RT7302GS 数据手册

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®
RT7302  
Primary-Side-Regulation Dimmable LED Driver Controller  
with Active PFC  
General Description  
Features  
Tight LED Current Regulation  
No Opto-Coupler and TL431 Required  
Power Factor Correction (PFC)  
Compatible with PWM Dimming  
Built-in HV Start-up Device  
The RT7302 is a constant current LED driver with active  
power factor correction. It supports high power factor  
across a wide range of line voltages, and it drives the  
converter in the Quasi-Resonant (QR) mode to achieve  
higher efficiency. By using Primary Side Regulation (PSR),  
the RT7302 controls the output current accurately without  
a shunt regulator and an opto-coupler at the secondary  
side, reducing the external component count, the cost,  
and the volume of the driver board.  
Quasi-Resonant  
Maximum/Minimum Switching Frequency  
Clamping  
Input Voltage Feed-Forward Compensation  
Maximum/Minimum On-Time Limitation  
Wide VDD Voltage Range (up to 25V)  
Multiple Protection Features  
LED Open-Circuit Protection  
The RT7302 is designed to be compatible with PWM  
Dimming. The output current can be modulated by the  
duty ratio of the external PWM dimming signal.  
An in-house design High Voltage (HV) start-up device is  
integrated in the RT7302 to minimize the power loss and  
shorten the start-up time.  
LED Short-Circuit Protection  
Output Diode Short-Circuit Protection  
VDD Under-Voltage Lockout  
VDD Over-Voltage Protection  
Over-Temperature Protection  
Cycle-by-Cycle Current Limit  
RoHS Compliant and Halogen Free  
The RT7302 embeds comprehensive protection functions  
for robust designs, including LED open-circuit protection,  
LED short-circuit protection, output diode short-circuit  
protection, VDD Under-Voltage Lockout (UVLO), VDD  
Over-Voltage Protection (VDD OVP), Over-Temperature  
Protection (OTP), and cycle-by-cycle current limitation.  
Applications  
AC/DC LED Lighting driver  
Simplified Application Circuit  
Flyback Converter  
Buck-Boost Converter  
D
TX1  
OUT  
BD  
BD  
Line  
Line  
V
OUT-  
V
V
OUT+  
C
TX1  
C
OUT  
OUT  
D
OUT  
C
R
R
R
HV  
SIN  
M1  
M2  
C
SIN  
R
R
R
HV  
M1  
RT7302  
V
RT7302  
OUT+  
OUT-  
HV  
Q1  
GD  
CS  
Q1  
HV  
GD  
CS  
Neutral  
Neutral  
MULT  
MULT  
R
PC  
R
PC  
M2  
R
CS  
COMP  
GND  
R
CS  
COMP  
GND  
C
D
AUX  
COMP  
C
D
AUX  
COMP  
VDD  
VDD  
ZCD  
C
VDD  
ZCD  
R
R
C
ZCD1  
ZCD2  
VDD  
R
R
ZCD1  
ZCD2  
Copyright 2015 Richtek Technology Corporation. All rights reserved.  
©
is a registered trademark of Richtek Technology Corporation.  
DS7302-03 May 2015  
www.richtek.com  
1

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