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  Richtek Technology Electronic Components Datasheet  

RT6033 Datasheet

4-CH Constant Current LED Driver

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®
RT6033
4-CH Constant Current LED Driver for Display Backlight
General Description
The RT6033 is a 4-CH constant current sink LED drivers
with Dynamic Headroom Control (DHC) function. RT6033
can provide well current matching ability, adjustable VSET
to choose the suitable dropout voltage across the MOS /
BTJ. Beside that, DHC will provide the stable VFB
dimming, thus voltage ripple is kept as small even during
the dimming.
The RT6033 provides four channel constant currents with
less than 3% differences in output current value among
the 4-CH and ICs respectively. The constant current is
adjustable by each channel external resistor (RISET). The
LED brightness can also be adjusted via the EN/PWM
pin with PWM dimming duty from 1% to 100%. The RT6033
can operate with external components for high current
application
The DHC function generates feedback signal to DC/DC
control loop and regulate the output voltage. When RT6033
selects the LED string with the highest forward voltage,
and then the COMP is defined according to that particular
string. The COMP voltage is then compared with the
voltage of VSET to determine the voltage level of VFB,
which therefore control the switching of the primary
controller.
RT6033's protection features include Short LED Protection
(SLP), Open LED Protection (OLP) and Over Temperature
Protection (OTP). When any channel triggers protection
function, LED will be turned off and the FAULT pin will pull
low.
The RT6033 is available in SOP-16 package to achieve
optimized solution for PCB space.
Simplified Application Circuit
VOUT
COUT
4 x NLEDs
DSL11
DSL14
VCC
VSET
RSET1
RSET2
CVCC1
FAULT
RT6033
VCC
FAULT
RSLP
SLP
Q1 ZD2
……
VSET
VFB
SLP
VCC COMP
RCOMP
COMP
CCOMP
DC11
D1
DC14
……
COMP1
RFAULT
VCC
FAULT OUT1
CS1
M11
PWM Signal
EN/PWM
OUT4
……
CS4
GND
……
RS11
M14
RS14
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS6033-03 April 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT6033 Datasheet

4-CH Constant Current LED Driver

No Preview Available !

RT6033
Features
z Wide Input Supply Voltage Range : 5V to 24V
z Adjustable Channel Current
z 3% Current Sense Amplifier Input Offset
z VCC Under Voltage Lockout
z Thermal Shutdown
z Adjustable Dynamic Headroom Control (DHC)
Function
z LED Open/Short Protection
z RoHS Compliant and Halogen Free
Applications
z LCD TV, MNT Display Backlight
z DC/DC or AC/DC LEDDriver Application
z General Purpose Constant Current Source
z Architectural and Decorative LED Lighting
z LED Street Lighting
Marking Information
RT6033
GSYMDNN
RT6033GS : Product Number
YMDNN : Date Code
Ordering Information
RT6033
Package Type
S : SOP-16
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)
SLP
VSET
VFB
COMP
EN/PWM
VCC
OUT1
CS1
2
3
4
5
6
7
8
16 FAULT
15 GND
14 OUT4
13 CS4
12 OUT3
11 CS3
10 OUT2
9 CS2
SOP-16
Functional Pin Description
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin Name
SLP
VSET
VFB
COMP
EN/PWM
VCC
OUT1
CS1
CS2
OUT2
CS3
OUT3
CS4
OUT4
GND
FAULT
Pin Function
Short LED Protection Sense Input.
Highest Voltage LED String.
Feedback Signal Output.
LED String Voltage Sense.
Chip Enable (Active High) and PWM Pulse Dimming Input.
Power Supply Input.
Channel 1 Current Gate Driver Output.
Channel 1 Current Sense Input.
Channel 2 Current Sense Input.
Channel 2 Current Gate Driver Output.
Channel 3 Current Sense Input.
Channel 3 Current Gate Driver Output.
Channel 4 Current Sense Input.
Channel 4 Current Gate Driver Output.
Power Ground.
Open Drain Output for Fault Detection.
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS6033-03 April 2013


Part Number RT6033
Description 4-CH Constant Current LED Driver
Maker Richtek
Total Page 16 Pages
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