Driver Controller. RT7302 Datasheet

RT7302 Controller. Datasheet pdf. Equivalent

RT7302 Datasheet
Recommendation RT7302 Datasheet
Part RT7302
Description Primary-Side-Regulation Dimmable LED Driver Controller
Feature RT7302; ® RT7302 Primary-Side-Regulation Dimmable LED Driver Controller with Active PFC General Descriptio.
Manufacture Richtek
Datasheet
Download RT7302 Datasheet




Richtek RT7302
®
RT7302
Primary-Side-Regulation Dimmable LED Driver Controller
with Active PFC
General Description
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.
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.
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.
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
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
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 RM1 RHV
RT7302
HV
MULT
GD
RM2
CS
RPC
TX1
DOUT
VOUT+
COUT
VOUT-
Q1
COMP
RCS
CCOMP
GND
VDD
ZCD
DAUX
CVDD
RZCD1
RZCD2
Line
Neutral
BD
CSIN RM1 RHV
RT7302
HV
MULT
GD
RM2
CS
RPC
TX1
Q1
DOUT
VOUT-
COUT
VOUT+
COMP
RCS
CCOMP
GND
VDD
ZCD
DAUX
CVDD
RZCD1
RZCD2
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS7302-03 May 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1



Richtek RT7302
RT7302
Ordering Information
RT7302
Package Type
S : SOP-8
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.
Marking Information
RT7302
GSYMDNN
RT7302GS : Product Number
YMDNN : Date Code
Pin Configurations
(TOP VIEW)
HV
GND
COMP
MULT
8
27
36
45
SOP-8
VDD
GD
CS
ZCD
Functional Pin Description
Pin No. Pin Name
Pin Function
1 HV
High Voltage Input for Startup.
2 GND
Ground of the Controller.
3
COMP
Compensation Node. Output of the internal trans-conductance amplifier.
4
MULT
Input for Line Voltage Signal. This pin is used to sense the line voltage by resistor divider
to achieve dimming function.
5 ZCD
Zero Current Detection Input. This pin is used to sense the voltage at auxiliary winding of
the transformer.
6 CS
Current Sense Input. Connect this pin to the current sense resistor.
7 GD
Gate Driver Output for External Power MOSFET.
8 VDD
Supply Voltage (VDD) Input. The controller will be enabled when VDD exceeds VTH_ON
and disabled when VDD is lower than VTH_OFF.
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS7302-03 May 2015



Richtek RT7302
Function Block Diagram
RT7302
HV
ZCD
CS
Clamping
Circuit
Valley
Detector
VMULT
Feed-Forward
Compensation
Ramp
Generator
Starter
Circuit
Constant Current Control
ICS
L : Open
H : Closed
+
-
Constant On-Time
Comparator
Output Over
Voltage
Protection
VCS_CL
+
1V -
Current Limit
Comparator
HV Start-Up
Control
Under
Voltage
Lockout
(16V/9V)
PWM
Control
Logic
VDD OVP
VDD Over
Voltage
Protection
PWM
VCLAMP 13V
Gate
Driver
RGD
Leading
Edge
Blanking
Dimming
VMULT
Comparator
+
VMULT_EN / VMULT_DS -
150mV / 100mV
Output Diode
Short Circuit
Protection
Over
Temperature
Protection
OTP
Output OVP
VDD
GD
GND
MULT
COMP
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS7302-03 May 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3







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