TPS61195 Datasheet, PDF (15/27 Pages) Texas Instruments – TPS61195 WLED Driver for LCD Backlighting With PWM and SMBus Control Interface

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PWM
I_LED
IFB1
D = 50%
T_ON
T_PWM
IFB2
IFB3
D = 35%
D = 10%
TPS61195
SLVSA07 – MAY 2010
IFB8
Figure 16. Direct PWM Dimming Timing Diagram
ANALOG DIMMING
In analog dimming mode, all used current sinks are always on, with each current sink being linearly controlled
from 0% to 100% of the maximum IFB current by the duty cycle brightness information stored in the brightness
register. Figure 17 shows a simple current diagram of analog dimming mode with PWM brightness control.
D = 50%
D = 35%
D = 12.5%
D = 6.25%
PWM
I_LED
IFB1
0
IFB2
T_ON
T_PWM
IFB3
IFB8
Figure 17. Analog Dimming Timing Diagram
Copyright © 2010, Texas Instruments Incorporated
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