TPS65142
SLVSAX5 –JULY 2011
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PIN FUNCTIONS (continued)
PIN
I/O
DESCRIPTION
NAME
IFB2
NO.
19
20
21
22
23
24
25
26
27
28
I
I
Channel 2 of the WLED backlight current sink
IFB3
Channel 3 of the WLED backlight current sink
Sets the delay to enable VGHM Output. Pin for external capacitor. Floating if no delay needed
Charge/discharge signal for VGHM
VDPM
VFLK
RE
O
I
Sets the slope for the gate shaping function. Pin for external Resistor
Output for gate-high modulation
VGHM
VGH
FBP
O
I
Input for positive Charge Pump
I
Positive charge pump feedback pin
DRVP
SUP
Voltage driver of positive charge pump
I
Supply pin of the gate shaping and operational amplifier blocks. Connected as well to the overvoltage protection
comparator. This pin needs to be connected to the output of the AVDD boost converter.
OPO
OPI
29
30
31
32
O
I
Output voltage of VCOM Buffer
Input voltage of VCOM Buffer
AVDD Boost converter feedback pin
FB
I
FREQ
I
AVDD boost converter switching frequency selection: 1.2MHz when V(FREQ) = VIN and 650 kHz when V(FREQ)
ground
=
PGND
ePAD
Exposed pad that serves as the power ground for both boost converters
8
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