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TPS65149 Datasheet(PDF) 21 Page - Texas Instruments

Part # TPS65149
Description  LCD Bias Solution for Monitors
PDF  50 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

TPS65149 Datasheet(HTML) 21 Page - Texas Instruments

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VIN
V
IN
GDControl
GD
I
GD
R
GD
Control
Logic
x1
55µA
2.5 mA
Normal
Short
Circuit
FBP
DRVP
FBPH
RNTC
V
AVDD
V
GH
SW
R
15
R
16
R
12
R
NTC
R
10
R
11
Error
Amplifier
V
C
REF
lamp
55µA
V
L
V
L
+
-
372mV*
GD
Disable
SCP (Normal)
+
-
124mV*
SCP (Start-Up)
55 ms
Timer
UVP (Normal)
1.15V*
TI Information — Selective Disclosure
TPS65149
www.ti.com
SLVSAC1 – SEPTEMBER 2010
Figure 35. Gate Drive Internal Block Diagram
Positive Charge Pump
Figure 36 shows the internal block diagram of the positive charge pump.
The positive charge pump is driven directly from the boost converter's switch node and then post-regulated by an
external PNP transistor. The controller is optimized for transistors having a DC gain (hFE) in the range 100 to
300. The positive charge pump is temperature compensated so that its output voltage decreases at high
temperatures (see Figure 16).
Figure 36. Positive Charge Pump Internal Block Diagram
Copyright © 2010, Texas Instruments Incorporated
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