LD5805
06/15/2015
Step up, 4 strings, Max. 250mA/string, Multi-dimming mode
WLED Backlight Controller
REV. 01
General Description
Features
Input Voltage range: 6V to 36V
The LD5805 is a 4-channel linear current controller which
combines with a boost switching controller. It’s an ideal
solution for driving high power LED backlights. The
LD5805 can achieve high accuracy of constant current to
4 LED strings with 4 internal MOSFET. For each LED
string, the current is adjustable to drive up to 250mA.
The LD5805 features 4 individual current regulator
channels to give accurate driving current for each LED
string. The current balance rate is 2.7%. The 10V gate
driver allows the use of standard level MOSFETs. It can
provide a PDIM or ADIM dimming control.
Drives up to 4 strings in parallel, up to 250mA per
string
LED current balance rate is 2.7%
Programmable switching frequency
PWM Input for PDIM or ADIM dimming control
Use PDIM mode: PWM Input frequency Range
100Hz ~ 1kHz
Use ADIM mode: PWM Input frequency Range 1kHz
~ 30kHz
HV gate Voltage of 10V for driver
Multi-chip parallel operation
LED short and open protection
LED pin short to ground protection
Programmable over-voltage protection
Thermal shutdown
The LD5805 eliminates the audio noise by maintaining
constant LED current regulation during ADIM dimming.
The other features include LED short and open protection,
cycle by cycle current limit, and thermal shutdown.
Applications
Backlight for GPS, Portable DVD
LED Backlight for LCD Monitor/ TV
1
Leadtrend Technology Corporation www.leadtrend.com.tw
LD5805-DS-01 June 2015