6-Channels 40V White LED Driver with Boost Regulator

G2541
Global Mixed-mode Technology
6-Channels 40V White LED Driver
with Boost Regulator
Features
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.
„
„
„
„
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
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 current, 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 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 amplitude of the currents. Open
LED-string automatically disable the channel from entering over voltage protection.
Applications
„ UMPC and Notebook Computer Backlight
Ordering Information
ORDER
NUMBER
TEMP.
RANGE
G2541R91U
2541
PACKAGE
(Green)
PACKING
-40°C to +85°C TQFN4X4-20
Note:R9: TQFN4X4-20
1: Bonding Code
U: Tape & Reel
Pin Configuration
Typical Application Circuit
L1
D1
CVIN
LX
LX OVP
RVIN
VCC
CVCC
VDC
15
LX
NC
2
14
PGND
MODE
ISET
3
13
PGND
PWM
MODE
4
12
OVP
AGND
5
11
CS1
EN
G2541
COMP
10
LED3
ISET
RISET
TQFN4X4-20
LED1
LED2
CC1
CS2
CS3
9
8
CS4
7
6
RC1 CC2
CS5
COUT
ROVP1
1
Thermal
Pad
ROVP2
40V MAX
VIN
EN
CS6
VOUT
VIN
16
VDC
PWM
17
VIN
19
18
20
COMP
G2541
LED4
LED5
LED6
AGND PGND
Note: Recommend connecting the Thermal Pad to
the Ground for excellent power dissipation.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 0.2
Aug 12, 2013
1