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LP8555 Datasheet(PDF) 22 Page - Texas Instruments

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Part # LP8555
Description  LP8555 High-Efficiency LED Backlight Driver for Tablet PCs
PDF  64 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LP8555 Datasheet(HTML) 22 Page - Texas Instruments

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OFF
EN/VDDIO
ON bit (I
2C)
Timing between these
two signals is not critical
PWM/INT
VLDO
VBOOSTx
STARTUP
STANDBY
BOOST STARTUP
ILED_OUTx
VDD
ACTIVE
VINIT
Adaptation to LED VF
BRT[11:0] register
Ramp time and shape
defined in registers
I
2C unavailable
200µs typ.
1ms max
5ms typ.
7ms max
MODE
STANDBY
OFF
No active discharge
2 Full PWM Cycles needed
for sampling PWM input
1/75Hz timeout
UVLO
I
2C unavailable
Timing between these
two signals is not critical
VINIT
Note: If PWMSB = 1, then device enters
standby mode after PWM input has been low
for 50ms timeout period even if ON bit is 1.
OFF
EN/VDDIO
ON bit (I
2C)
Timing between these
two signals is not critical
PWM/INT
VLDO
VBOOSTx
STARTUP
STANDBY
BOOST STARTUP
ILED_OUTx
VDD
ACTIVE
VINIT
Adaptation to LED VF
BRT[11:0] register
Ramp time and shape
defined in registers
I
2C unavailable
200µs typ.
1ms max
5ms typ.
7ms max
MODE
STANDBY
OFF
No active discharge
2 Full PWM Cycles needed
for sampling PWM input
1/75Hz timeout
UVLO
I
2C unavailable
Timing between these
two signals is not critical
Backlight started with
writing ON bit high
VINIT
LP8555
SNVS857 – FEBRUARY 2014
www.ti.com
Figure 33. Start-up and Shutdown with PWM Input Control, ON Bit = 0 (BRTMODE = 00b)
Figure 34. Start-up and Shutdown with PWM Input Control, ON Bit = 1 (BRTMODE = 00b)
22
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Copyright © 2014, Texas Instruments Incorporated
Product Folder Links: LP8555



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