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  Richtek Technology Electronic Components Datasheet  

RT7304 Datasheet

Primary-Side-Regulation LED Driver Controller

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®
RT7304
Primary-Side-Regulation LED Driver Controller
with Active PFC
General Description
The RT7304 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 RT7304 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.
The RT7304 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.
Marking Information
0H=DNN
0H= : Product Code
DNN : Date Code
Features
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 Voltage 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 Limit
RoHS Compliant and Halogen Free
Applications
AC/DC LED Lighting driver
Simplified Application Circuit
Flyback Converter
Buck-Boost Converter
Line
Neutral
BD
CSIN
RST
RT7304
GD
VDD
CS
RG
RPC
CVDD
CCOMP
COMP
GND
ZCD
DAUX
TX1 DOUT
VOUT+
COUT
Line
VOUT-
Q1 Neutral
RCS
RZCD2
RZCD1
BD
CSIN
RST
RT7304
GD
VDD
CS
RG
RPC
CVDD
CCOMP
COMP
GND
ZCD
DAUX
TX1
VOUT-
DOUT
COUT
VOUT+
Q1
RCS
RZCD2
RZCD1
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS7304-04 February 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT7304 Datasheet

Primary-Side-Regulation LED Driver Controller

No Preview Available !

RT7304
Ordering Information
RT7304
Package Type
E : SOT-23-6
Lead Plating System
G : Green (Halogen Free and Pb Free)
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)
COMP ZCD CS
654
23
GND VDD GD
SOT-23-6
Functional Pin Description
Pin No. Pin Name
Pin Function
1 GND
Ground of the Controller.
2 VDD
3 GD
Supply Voltage (VDD) Input. The controller will be enabled when VDD exceeds VTH_ON
and disabled when VDD is lower than VTH_OFF.
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
ZCD
Clamping
Circuit
Constant Current Control
ICS
Output Over
Voltage
Protection
Leading
CS Edge
Blanking
Valley
Detector
Ramp
Generator
Starter
Circuit
+
-
Constant On-Time
Comparator
VCS_CL
+
1V -
Current Limit
Comparator
PWM
Control
Logic
Output Diode
Short Circuit
Protection
Over
Temperature
Protection
OTP
Output OVP
Under
Voltage
Lockout
(16V/9V)
VDD OVP
VDD Over
Voltage
Protection
PWM
VCLAMP 13V
Gate
Driver
RGD
VDD
GD
GND
COMP
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS7304-04 February 2015


Part Number RT7304
Description Primary-Side-Regulation LED Driver Controller
Maker Richtek
Total Page 14 Pages
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