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Leadtrend - High Voltage 4-Channel LED Controller Driver

Numéro de référence LD7890
Description High Voltage 4-Channel LED Controller Driver
Fabricant Leadtrend 
Logo Leadtrend 





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LD7890 fiche technique
LD7890
11/5/2013
High Voltage 4-Channel LED Controller Driver
REV: 01
General Description
The LD7890 is a 4-channel LED controller with a boost
switching controller. It’s an ideal solution for driving high
power LED backlights. The LD7890 can deliver high
accuracy of constant current to 4 individual LED strings
with 4 External MOSFET without cross-reference.
The LD7890 is designed for Current-Mode Boost
Controller, capable to operate over a wide range VIN from
9V to 28V and build in the High voltage MOSFET gate to
reduce external Power MOSFET thermal issue.
The other features include LED short and open protection,
cycle by cycle current limit, and thermal shutdown.
Typical Application
VIN
Cin
10V
NMOS
Features
Input Voltage range: 9V to 28V
4 Channel LED Controller
External and Internal PWM dimming control
LED short circuit protection
LED open string protection
Cycle-by-Cycle Current Limit
Over-temperature protection
Status output
Applications
LED TV Backlight
LED Monitor Backlight
LED Lighting
33uF
R1
OVP
EN
S3
G3
D3
S4
G4
D4
LD7890
VIN DRV
OVP
EN
RT
COMP
PARL
GND
CS
DIM
LOSC
STATUS
Sense1
Gate1
FB1
Sense2
Gate2
FB2
FB4
Gate4
Sense4
FB3
Gate3
Sense3
OVP
R2
PWM
5V
D3
G3
S3
D4
G4
S4
Fig. 1 Application circuit for 4 strings of LED light bar with External PWM
Leadtrend Technology Corporation
LD7890-DS-01 November, 2013
1
www.leadtrend.com.tw

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