RT7305 Datasheet, PDF (1/14 Pages) Richtek Technology Corporation – The RT7305 consists of a high voltage power MOSFET

RT7305
Primary-Side Regulation LED Driver Controller with
Active-PFC and Integrated Power MOSFET
General Description
The RT7305 consists of a high voltage power MOSFET
and a high-performance 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), RT7305 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.
RT7305 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 (OVP), Over-Temperature
Protection (OTP), and cycle-by-cycle current limitation.
Applications
 AC/DC LED Lighting Driver
Features
 Integrated 620V Power MOSFET
 Tight LED Current Regulation
 No Opto-Coupler and TL431 Required
 Power Factor Correction (PFC)
 Quasi-Resonant
 Maximum/Minimum Switching Frequency
Clamping
 Maximum/Minimum on-Time Limitation
 Wide VDD Range (up to 25V)
 Multiple Protection Features
 LED Open-Circuit Protection
 LED Short-Circuit Protection
 Output Diode Short-Circuit Protection
 VDD Under-Voltage Lockout
 VDD Over-Voltage Protection
 Over-Temperature Protection
 Cycle-by-Cycle Current Limitation
 RoHS Compliant and Halogen Free
Simplified Application Circuit
Flyback Application Circuit
Line
Neutral
BD1
TX1 ^DOUT
CIN RST
VDD
DRAIN
CVDD
RT7305
SOURCE
COMP
CS
CCOMP
ZCD
GND
DAUX
RPC
RCS
VOUT+
COUT
VOUT-
RZCD1
RZCD2
Buck-Boost Application Circuit
Line
Neutral
BD1
TX1
CIN RST
VDD
DRAIN
CVDD
RT7305
SOURCE
COMP
CS
CCOMP
RPC
RCS
DOUT
ZCD
GND
DAUX
VOUT-
COUT
VOUT+
RZCD1
RZCD2
Copyright © 2014 Richtek Technology Corporation. All rights reserved.
DS7305-00 July 2014
is a registered trademark of Richtek Technology Corporation
www.richtek.com
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