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参数资料
| 型号： | TPS65148RHBR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 |
| 封装： | 5 X 5 MM, GREEN, PLASTIC, QFN-32 |
| 文件页数： | 14/30页 |
| 文件大小： | 947K |
| 代理商： | TPS65148RHBR |
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UVLO
UVLO
Device
ENABLED
Device
DISABLED
GD
EN
BOOST
VCOM
VGH (external)
VDPM
Vref=1.240V
Co
nn
ected
to
VG
H
=
LC
D
Dis
ch
arg
e
Fu
nctio
n
VGHM
Slopeset
byRe
V
DET_THRESHOLD
Delayset
byVDPM
VGL (external)
VIN
REG_O
Unknownstate
VFLK
www.ti.com
SLVS904A – MAY 2009 – REVISED JANUARY 2011
POWER SEQUENCING
When EN is high and the input voltage VIN reaches the Under Voltage Lockout (UVLO), the device is enabled
and the GD pin is pulled low. The boost converter starts switching and the VCOM buffer is enabled. As soon as
VS of the boost converter reaches its Power Good, the voltage regulator for the gamma buffer is enabled and the
delay enabling the gate voltage shaping block starts. Once this delay has passed, the VGHM pin output is
enabled.
1. GD
2. Boost converter & VCOM Buffer
3. Voltage regulator for Gamma Buffer
4. VGHM (after proper delay)
Figure 26. Sequencing TPS65148
Power off sequencing and LCD discharge function
When the input voltage VIN falls below a predefined threshold (set by VDET_THRESHOLD - see Figure 26 ), XAO is
driven low and VGHM is driven to VGH. (Note that when VIN falls below the UVLO threshold, all IC functions are
disabled except XAO and VGHM). Since VGHM is connected to VGH, it tracks the output of the positive charge
pump as it decays. This feature, together with XAO can be used to discharge the panel by turning on all the pixel
TFTs and discharging them into the gradually decaying VGHM voltage. VGHM is held low during power-up.
Copyright 2009–2011, Texas Instruments Incorporated
21
Product Folder Link(s) :TPS65148
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