LED Driver. RT6032 Datasheet

RT6032 Driver. Datasheet pdf. Equivalent

RT6032 Datasheet
Recommendation RT6032 Datasheet
Part RT6032
Description 4-CH Constant Current LED Driver
Feature RT6032; ® RT6032 4-CH Constant Current LED Driver for Display Backlight General Description The RT6032 is .
Manufacture Richtek
Datasheet
Download RT6032 Datasheet




Richtek RT6032
®
RT6032
4-CH Constant Current LED Driver for Display Backlight
General Description
The RT6032 is a 4-CH constant current sink LED drivers
with Dynamic Headroom Control (DHC) function. RT6032
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 RT6032 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 RT6032
can operate with external components for high current
applications.
The DHC function generates feedback signal to DC/DC
control loop and regulate the output voltage. When RT6032
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.
RT6032'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 RT6032 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
RT6032
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.
DS6032-03 April 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1



Richtek RT6032
RT6032
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
RT6032
GSYMDNN
RT6032GS : Product Number
YMDNN : Date Code
Ordering Information
RT6032
Package Type
S : SOP-16
Note :
Lead Plating System
G : Green (Halogen Free and Pb Free)
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.
DS6032-03 April 2013



Richtek RT6032
Function Block Diagram
VCC
SLP
EN/PWM
COMP
VSET
VFB
GND
UVLO
4V
Regulator
BandGap
Reference
0.6V
8
-
VDD + 0.4V
2.5V
VDD
-
+
Fault
Logic
VCC
+
-
OTP
DHC
+
-
+
-
+
-
+
-
RT6032
OUT1
CS1
OUT2
CS2
OUT3
CS3
OUT4
CS4
FAULT
Operation
The RT6032 is a 4-CH LEDdriver integrated with a feedback
controller. When EN/PWM is go high and VCC is exceeded
the voltage of the UVLO, it will start-up. During the first
256μs, RT6032 will detect which channels are using. If
the CS pin < 0.4V, that channel is defined as USED
channel. Otherwise, the channel is defined as UN-USED
if CS pin > 0.4V. And the diver of this channel will be
turned off after the un-used checking.
Then RT6032 will enter the soft-start state, VFB is kept
as 3.3V. After that period, RT6032 selects the LED string
with the highest forward voltage, and then COMP is defined
according to that particular string. The voltage of COMP
will further compare with the voltage of VSET and
determine the voltage level of VFB.
Beside that, the protection function is activated after the
fault blanking period. If the LED string is broken or shorted,
RT6032 will turn off channels. The internal MOS of the
FAULT will be turned-on, users could add an external pull-
high resistor to get this alarm signal.
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS6032-03 April 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3







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