TPS65142
SLVSAX5 –JULY 2011
www.ti.com
VBAT = 100 mV/div
DCTRL = 5 V/div
BL_SW = 20 V/div
VBAT = 12 V, VO = 30.6 V (LED 10S6P)
V
O = 100 mV/div
Duty = 100%, L = 10 mH, CO = 4.7 mF
VO = 100 mV/div
IL = 1 A/div
VBAT = 12 V, VO = 30.6 V (LED 10S6P)
Duty = 50%, L = 10 mH, CO = 4.7 mF
IL = 1 A/div
Time = 1 ms / div
Figure 21. LED DRIVER SWITCHING WAVEFORM
Figure 22. LED DRIVER OUTPUT RIPPLE AT PWM
DIMMING
VO = 10 V/div
EN = 5 V/div
BL_SW = 10 V/div
VO = 10 V/div
VBAT = 12 V, VO = 30.6 V (LED 10S6P)
Duty = 100%, L = 10 mH, CO = 4.7 mF
VBAT = 12 V, VO = 30.6 V
(LED 10S1P)
IL = 1 A/div
Duty = 100%, L = 10 mH
CO = 4.7 mF
ILED (One String) = 20 mA/div
IL = 200 mA/div
Time = 20 ms / div
Time = 400 ms / div
Figure 23. LED DRIVER POWER ON SEQUENCE
Figure 24. LED DRIVER OPEN WLED PROTECTION
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