LP5526TL/NOPB National Semiconductor, LP5526TL/NOPB Datasheet - Page 19

• Manufacturer Part Number: LP5526TL/NOPB
• Description: IC LED DRVR WT/RGB BCKLT 25-USMD
• Manufacturer: National Semiconductor
• Series: PowerWise®r
• Type: Backlight, White LED, RGB (I²C Interface)r

Specifications of LP5526TL/NOPB

• Constant Current: Yes
• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 5
• Internal Driver: Yes
• Type - Primary: Backlight, Light Management Unit (LMU)
• Type - Secondary: RGB, White LED
• Frequency: 1MHz
• Voltage - Supply: 3 V ~ 5.5 V
• Voltage - Output: 8 V ~ 20 V
• Mounting Type: Surface Mount
• Package / Case: 25-MicroSMD
• Operating Temperature: -30°C ~ 85°C
• Current - Output / Channel: 150mA
• Internal Switch(s): Yes
• Efficiency: 88%
• For Use With: LP5526TLEV - BOARD EVAL LP5526 LMU LED DRIVER
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LP5526TLTR

FADE IN / FADE OUT
LP5526 has an automatic fade in and out for main and sub
backlight. The fade function is enabled with EN_FADE bit.
The slope of the fade curve is set by the SLOPE bit. Fade
control for main and sub display is set by FADE_SEL bit.
Recommended fading sequence:
1.
2.
3.
4.
5.
6.
Fading times apply to full scale change i.e. from 0 to 100% or
vice versa. If the current change does not correspond to full
scale change, the time will be respectively shorter. See WLED
Dimming diagrams for typical fade times.
Note: if DISPL=1 and FADE_SEL=0 then FADE effects MAIN and SUB
FADE_SEL
EN_FADE
EN_MAIN
EN_SUB
SLOPE
DISPL
Name
Set SLOPE
Set FADE_SEL
Set EN_FADE = 1
Set EN_MAIN / EN_SUB = 1
Set target WLED value
Fading will be done either within 0.65s or 1.3s based on
SLOPE selection
WLED CONTROL REGISTER (03H)
Bit
5
4
3
2
1
0
FADE execution time:
0 = 1.3s (full scale)
1 = 0.65s (full scale)
FADE selection:
0 = FADE controls MAIN
1 = FADE controls SUB
FADE enable
0 = FADE disabled
1 = FADE enabled
Display mode:
0 = MAIN and SUB individual control
1 = MAIN and SUB controlled with
MAIN DAC
MAIN enable:
0 = disable
1 = enable
SUB enable:
0 = disable
1 = enable
Description
19
Adjustment is made with 04H (main current) and with 05H
(sub current) registers:
MAIN CURRENT [7:0]
SUB CURRENT [7:0]
0000 0000
0000 0001
0000 0010
0000 0011
1111 1101
1111 1110
1111 1111
…
…
Driver current,
mA (typical)
25.3
25.4
25.5
0.1
0.2
0.3
…
…
0
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