G2542 Datasheet: 6-Channels 40V White LED Driver





G2542 6-Channels 40V White LED Driver Datasheet

Part Number G2542
Description 6-Channels 40V White LED Driver
Manufacture Global Mixed-mode Technology
Total Page 1 Pages
PDF Download Download G2542 Datasheet PDF

Features: Global Mixed-mode Technology G2542 6-C hannels 40V White LED Driver with Boos t Regulator Features „ Wide 2.7V to 5 .5V Input Supply Range „ 600KHz Fixed Frequency „ 40V/2A, 0.2Ω n-channel MO SFET „ Maximum Programmable LED Channe l Current 30mA „ Current accuracy ±3% and current balance ±2% „ 100Hz~25kH z PWM Dimming „ PWM to DC Dimming „ P rotection Š Input Under-Voltage Protec tion Š Over Current Protection Š Over Voltage Protection Š Thermal Protecti on „ RoHs Compliant „ TQFN4X4-20 Pack age Applications „ UMPC and Notebook C omputer Backlight Ordering Information ORDER TEMP. NUMBER RANGE G2542R91U 2542 Note:R9: TQFN4X4-20 1: Bonding Code U: Tape & Reel PACKAGE (Green) P ACKING -40°C to +85°C TQFN4X4-20 Ge neral Description The G2542 is a high-e fficiency 6-channel white LED driver. I t is designed for LCD panel that employ s an LED array as the lighting source. An integrated switch current mode boost controller drives six strings in parallel and supports up to 1.

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Global Mixed-mode Technology
G2542
6-Channels 40V White LED Driver
with Boost Regulator
Features
„ Wide 2.7V to 5.5V Input Supply Range
„ 600KHz Fixed Frequency
„ 40V/2A, 0.2Ω n-channel MOSFET
„ Maximum Programmable LED Channel Current
30mA
„ Current accuracy ±3% and current balance ±2%
„ 100Hz~25kHz PWM Dimming
„ PWM to DC Dimming
„ Protection
Š Input Under-Voltage Protection
Š Over Current Protection
Š Over Voltage Protection
Š Thermal Protection
„ RoHs Compliant
„ TQFN4X4-20 Package
Applications
„ UMPC and Notebook Computer Backlight
Ordering Information
ORDER
TEMP.
NUMBER RANGE
G2542R91U
2542
Note:R9: TQFN4X4-20
1: Bonding Code
U: Tape & Reel
PACKAGE
(Green)
PACKING
-40°C to +85°C TQFN4X4-20
General Description
The G2542 is a high-efficiency 6-channel white LED
driver. It is designed for LCD panel that employs an 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 G2542 automatically regulated supply voltage for
the LED light bars without the need to calculate the
output for different LED types. It also integrates a 40V
n-channel MOSFET that provides high output power.
The 6-channel current driver is ideal for constant cur-
rent driving, and well matched less than 3%. To set
the maximum driving current, the ISET pin is used to
determine reference current. Each channel of the cur-
rent drivers is set to 800 times of this reference current.
A PWM pin can be used to perform PWM dimming
from the range of 100Hz to 25kHz.
The MODE pin in G2542 is used to set the dimming
mode. If MODE pin set to floating, the dimming mode
is in the PWM mode, the current driver ON/OFF is
synchronized with the PWM signal. If Mode pin set to
AGND, PWM and ILED current is set at PWM duty
multiplied by ISET current when PWM duty 25%. If
the PWM duty <25%, the ILED current is fixed at
0.25xISET, and the dimming duty is 4 x PWM duty. If
MODE set to VDC, the dimming mode operated in the
Pure DC mode, the current-source outputs are DC
dimming and the PWM duty cycle modulates the am-
plitude of the currents. Open LED-string automatically
disable the channel from entering over voltage protec-
tion.
Pin Configuration
G2542
EN
NC
ISET
MODE
AGND
1
2
3
4
5
Thermal
Pad
15 LX
14 PGND
13 PGND
12 OVP
11 CS1
TQFN4X4-20
Note: Recommend connecting the Thermal Pad to
the Ground for excellent power dissipation.
Typical Application Circuit
VIN
CVIN
RVIN
VCC
CVCC
RC1 CC2
CC1
RISET
L1 D1
LX OVP
VIN
VDC
EN
MODE
PWM
G2542
COMP LED1
LED2
LED3
ISET LED4
LED5
LED6
AGND PGND
ROVP2
ROVP1
COUT
VOUT
40V MAX
Ver: 0.2
Aug 12, 2013
TEL: 886-3-5788833
http://www.gmt.com.tw
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