LED Driver. RT8532A Datasheet


RT8532A Driver. Datasheet pdf. Equivalent


Part Number

RT8532A

Description

6-String 43V White LED Driver

Manufacture

Richtek

Total Page 15 Pages
Datasheet
Download RT8532A Datasheet


RT8532A
®
RT8532A
6-String 43V White LED Driver with Boost Regulator
General Description
The RT8532A is a high efficiency white LED driver. It is
designed for LCD panel that employs a LED array as the
lighting source. An integrated switch current mode Boost
controller drives six strings in parallel and supports up to
10 pieces of LEDs per string. The internal current sinks
support maximum ±2% current matching for excellent
brightness uniformity in each LED string. To provide enough
headroom for the operating of current sink, the Boost
controller monitors the minimum voltage of feedback pins
and regulates an optimized output voltage for power
efficiency.
The RT8532A has wide input voltage range from 2.5V to
24V and provides adjustable 5mA to 50mA LED current.
The internal 200mΩ, 43V power switch with current-mode
control provides cycle-by-cycle over current protection.
The RT8532A also integrates PWM and analog dimming
functions for accurate LED current control. The input PWM
dimming frequency can be operated operate from 100Hz
to 20kHz without any inrush current in LED.
The RT8532A is available in WQFN-20L 3x3 package.
Features
Wide Input Voltage : VIN 2.5V to 24V
High Output Voltage : VOUT up to 43V
Programmable Full Channel Current from 5mA to
50mA and Matched to 2%
Channel Current Regulation with ±3% Accuracy
Dimming Controls
Direct PWM Dimming up to 20kHz and Minimum
On-Time to 500ns
PWM to Analog and PWM Dimming up to
20kHz with Maximum 9 bit Resolution
Built-In Soft Start to Prevent Inrush Current without
External Capacitor
Disconnects LED in Shutdown
Protection
Strings Open Detection
Current Limit Protection
Programmable Over Voltage Protection
Over Temperature Protection
20-Lead WQFN Package
RoHS Compliant and Halogen Free
Applications
UMPC and Notebook Computer Backlight
Simplified Application Circuit
VIN
Chip Enable
L1 D1
CIN LX
VIN
EN RT8532A OVP
PWM Signal
MIX
CC RCOMP
CCOMP
RISET
RFSW
PWM
MIX
COMP
LED1
LED2
LED3
LED4
LED5
ISET
LED6
FREQ
AGND PGND
COUT
VOUT
ROVP2
ROVP1
: :::::
: :::::
COVP : : : : : :
Copyright ©2019 Richtek Technology Corporation. All rights reserved.
DS8532A-00 February 2019
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT8532A
RT8532A
Ordering Information
RT8532A
Package Type
QW : WQFN-20L 3x3 (W-Type)
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 Configuration
(TOP VIEW)
EN
FREQ
ISET
MIX
AGND
20 19 18 17 16
1 15 LX
2 14 PGND
3 GND 13 PGND
4 21 12 OVP
5 11 LED1
6 7 8 9 10
Marking Information
PD= : Product Code
PD=YM
DNN
YMDNN : Date Code
WQFN-20L 3x3
Functional Pin Description
Pin No.
1
2
3
Pin Name
Pin Function
EN Chip enable (active high). There is an internal pull low resistor 400kfor the EN pin.
FREQ
Switching frequency of boost converter setting. Connect a resistor between this pin
and AGND to set the switching frequency.
RFSW
1.1
25
FSW (MHz)
6
k
ISET
LED current setting. LED current is set by the resistor RISET connected from the ISET
pin to ground.
ILED
mA
240
RISET k
4 MIX
5
6, 7, 8, 9, 10,
11
12
AGND
LED6 to
LED1
OVP
Dimming Mode Selection. Floating the MIX pin for mixed mode.
Connecting the MIX pin to GND for pure DC mode. Connecting the MIX pin to VDC
for PWM dimming mode.
Analog ground of LED driver.
Current sink for LED string. (Leave the pin unconnected or short to GND, if not used.)
Over voltage protection sense input. The detecting threshold is 1.2V (typ.).
13, 14
PGND Power ground of boost converter.
15, 16
LX
Switching pin of boost converter.
17
PWM
PWM dimming control input.
18
VDC
Internal regulator voltage. Connect a capacitor from this pin to ground.
19 VIN Power supply input.
20
COMP
Compensation note for boost converter. Connect a compensation network to this pin
for stability.
21
(Exposed Pad)
GND
Ground. The Exposed Pad must be Soldered to a Large PCB and Connected to GND
for Maximum Power Dissipation.
Copyright ©2019 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8532A-00 February 2019


Features ® RT8532A 6-String 43V White LED Drive r with Boost Regulator General Descrip tion The RT8532A is a high efficiency w hite LED driver. It is designed for LCD panel that employs a LED array as the lighting source. An integrated switch c urrent mode Boost controller drives six strings in parallel and supports up to 10 pieces of LEDs per string. The inte rnal current sinks support maximum ±2% current matching for excellent brightn ess uniformity in each LED string. To p rovide enough headroom for the operatin g of current sink, the Boost controller monitors the minimum voltage of feedba ck pins and regulates an optimized outp ut voltage for power efficiency. The RT 8532A has wide input voltage range from 2.5V to 24V and provides adjustable 5m A to 50mA LED current. The internal 200 mΩ, 43V power switch with current-mode control provides cycle-by-cycle over c urrent protection. The RT8532A also int egrates PWM and analog dimming function s for accurate LED current control. The input PWM dimming frequenc.
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