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G2541 Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – 6-Channels 40V White LED Driver with Boost Regulator
Global Mixed-mode Technology
G2541
6-Channels 40V White LED Driver
with Boost Regulator
Features
„ Wide 4.2V to 24V 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
NUMBER
TEMP.
RANGE
PACKAGE
(Green)
PACKING
G2541R91U
2541
-40°C to +85°C TQFN4X4-20
Note:R9: TQFN4X4-20
1: Bonding Code
U: Tape & Reel
General Description
The G2541 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 G2541 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 current driving, and well
matched less than 3%. To set the maximum driving cur-
rent, the ISET pin is used to determine reference current.
Each channel of the current 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 G2541 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 synchro-
nized 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 cur-
rent-source outputs are DC dimming and the PWM duty
cycle modulates the amplitude of the currents. Open
LED-string automatically disable the channel from enter-
ing over voltage protection.
Pin Configuration
Typical Application Circuit
G2541
EN 1
NC 2
ISET 3
MODE 4
AGND 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.
VIN
CVIN
RVIN
L1
D1
LX OVP
VIN
ROVP2
ROVP1
COUT
VCC
CVCC
VDC
EN
MODE
RC1 CC2
CC1
PWM
G2541
COMP LED1
LED2
LED3
ISET LED4
RISET
LED5
LED6
AGND PGND
VOUT
40V MAX
Ver: 0.2
Aug 12, 2013
TEL: 886-3-5788833
http://www.gmt.com.tw
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