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LP8551TLX/NOPB Datasheet(PDF) 32 Page - Texas Instruments

Part # LP8551TLX/NOPB
Description  LP8551 High-Efficiency LED Backlight Driver for Notebooks
PDF  46 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

LP8551TLX/NOPB Datasheet(HTML) 32 Page - Texas Instruments

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LP8551
SNVS673E – APRIL 2010 – REVISED SEPTEMBER 2014
www.ti.com
8.6.2.5 EEPROM Address 3
Address A3h
EEPROM ADDRESS 3 REGISTER
7
6
5
4
3
2
1
0
UVLO[1:0]
EN_PSPWM
PWM_FREQ[4:0]
Name
Bit
Access
Description
UVLO
7:6
R/W
00 = Disabled
01 = 2.7 V
10 = 5.4 V
11 = 8.1 V
EN_PSPWM
5
R/W
Enable phase shift PWM scheme
0 = phase shift PWM disabled, normal PWM mode used
1 = phase shift PWM enabled
PWM_FREQ
4:0
R/W
PWM output frequency setting. See PWM Frequency Setting for full
description of selectable PWM frequencies.
8.6.2.6 EEPROM Address 4
Address A4h
EEPROM ADDRESS 4 REGISTER
7
6
5
4
3
2
1
0
PWM_RESOLUTION[1:0]
EN_I_RES
LED_FAULT_THR
DRV_HEADR[2:0]
Name
Bit
Access
Description
PWM RESOLUTION
7:6
R/W
PWM output resolution selection. Actual resolution depends also on the output
frequency. See PWM Frequency Setting for full description.
00 = 8...10 bits (19.2 kHz...4.8 kHz)
01 = 9...11 bits (19.2 kHz... 4.8 kHz)
10 = 10...12 bits (19.2 kHz...4.8 kHz)
11 = 11...13 bits (19.2 kHz...4.8 kHz)
EN_I_RES
5
R/W
Enable LED current set resistor
0 = Resistor is disabled and current is set only with CURRENT EEPROM register bits
1 = Enable LED current set resistor. LED current is defined by the RISET resistor and the
CURRENT EEPROM register bits.
LED_FAULT_THR
4
R/W
LED fault detector thresholds. VSAT is the saturation voltage of the driver, typically 200
mV.
0 = 3.3V
1 = 5.3V
DRV_HEADR
2:0
R/W
LED output driver headroom control. VSAT is the saturation voltage of the driver, typically
200 mV.
000 = VSAT + 125 mV
001 = VSAT + 250 mV
010 = VSAT + 375 mV
011 = VSAT + 500 mV
100 = VSAT + 625 mV
101 = VSAT + 750 mV
110 = VSAT + 875 mV
111 = VSAT + 1000 mV
32
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Product Folder Links: LP8551



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