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TPS65167 View Datasheet(PDF) - Texas Instruments

Part NameDescriptionManufacturer
TPS65167 Compact LCD Bias Supply for TFT-LCD TV Panels TI
Texas Instruments TI
TPS65167 Datasheet PDF : 42 Pages
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TPS65167
TPS65167A
SLVS760C – APRIL 2007 – REVISED MARCH 2008
AVIN
GD
5 kW
IDLY
SW
SW
www.ti.com
SS
COMP
FB
RHVS
IDLY
Vref
Softstart
70 W
EN
750 kHz
Oszillator
GM Amplifier
VFB
1.154 V
GM Amplifier
Low Gain
VFB
1.154
Comparator
Sawtooth
Generator
SUP
M2
Current limit
and
Soft Start
Control Logic
M1
Overvoltage
Comparator
OVP
Vref
SUP
PGND
PGND
HVS
Figure 24. Block Diagram Boost Converter
Softstart (Boost Converter)
The main boost converter has an internal softstart to prevent high inrush current during start-up. The device
incorporates a digital softstart increasing the current limit in digital current limit steps. See Figure 2 for the typical
softstart timing.
High Voltage Stress Test (Boost converter and positive charge pump)
The TPS65167 and TPS65167A incorporates a high voltage stress test where the output voltage of the boost
converter Vs and the positive charge pump POUT is set to a higher voltage compared to the nominal
programmed output voltage. The High Voltage Stress test is enabled by pulling the HVS pin to high. With HVS =
high, the voltage on POUT, respectively VGH, remains unchanged with the TPS65167A and the TPS65167
regulates to a fixed output voltage of 30 V. The boost converter Vs is programmed to a higher voltage
determined by the resistor connected to RHVS. With HVS = high the RHVS pin is pulled to GND which sets the
voltage for the boost converter during the High Voltage Stress Test. The output voltage for the boost converter
during high voltage stress test is calculated as:
R1 + R2//R3
R1 + R2//R3
VsHVS = VFB R2//R3 = 1.146V R2//R3
R1 x R2
R3 =
æ
ç
VsHSV
-
ö
1÷
x
R2
-
R1
è VFB ø
(3)
18
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