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LD7889A Datasheet(PDF) 6 Page - Leadtrend Technology

Part # LD7889A
Description  4-Channel LED Backlight Driver
PDF  17 Pages
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Manufacturer  LEADTREND [Leadtrend Technology]
Direct Link  https://www.leadtrend.com.tw/
Logo LEADTREND - Leadtrend Technology

LD7889A Datasheet(HTML) 6 Page - Leadtrend Technology

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LD7889A
6
Leadtrend Technology Corporation
www.leadtrend.com.tw
LD7889A-DS-00 March 2012
Electrical Characteristics
(VIN=24V, TA=25C, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNITS
Input Power
Input Voltage range
4.5
36
V
VIN Operating Current
EN=PWM=5V
10
mA
VIN Shutdown Current
EN=PWM=0V
2
10
A
VIN Stand-By Current
EN=5V, PWM=0V
600
800
A
Under Voltage Lockout
Lockout Threshold
VREFLOCKOUT
3.6
4.1
4.2
V
Resume Threshold
VREFRESUME
4.2
4.4
4.6
V
Reference Voltage
Reference Voltage
VREF, VIN>6V
5.25
5.5
5.75
V
VREF Output Current Capability
IVREF
30
mA
Drive Logic
GATE Sink Resistance
VIN>6V
1
3.5
5
GATE Source Resistance
VIN>6V
1
5
9
Minimum MOSFET ON Time
150
ns
LED Current Regulation
Regulation LED Current per Channel
ISET=12K ,KISET=1200
Chip to chip average current
92
100
108
mA
Voltage at ISET pin
1.225
1.25
1.275
V
LEDs Current Matching
LED current=100mA
Calculating:
%
100
I
2
I
I
Average
MIN
MAX
2
%
LED regulation voltage
ILED=100mA/per channel
300
350
mV
LED regulation voltage
ILED=240mA/per channel
550
650
mV
Boost Controller
Adjustable Switching frequency
100
1000
kHz
Default Switching frequency
RRT =260k
180
200
220
kHz
Leading edge blanking time
150
ns
Voltage at RT pin
1.176
1.2
1.224
V
Boost Maximum duty cycle
Fsw=500kHz
90
93
96
%



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