Texas Instruments TPS65162 Evaluation Module TPS65162EVM-278 TPS65162EVM-278 데이터 시트
제품 코드
TPS65162EVM-278
Introduction
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1
Introduction
This section contains background information for the TPS65162EVM-278 evaluation module (EVM).
1.1
Specification
provides a summary of the TPS65162EVM-278 performance specifications. All specifications are
given for an ambient temperature of 25°C.
Table 1. Performance Specification Summary
Voltage Range (V)
Current Range (mA)
Specification
Minimum
Typical
Maximum
Minimum
Typical
Maximum
VIN
8
12
14
1500
Vs
14.7
15
15.3
500
VGL
–5.15
–5
–4.85
33
VGH
25.0
27
(1)
29.0
50
Vlogic
3.3
1500
(1)
Assumes that SUP = V
S
.
1.2
Modifications
The primary goal of this EVM is to facilitate user evaluation of the TPS65162 in a power-supply application
for a typical large TFT display. To facilitate user customization of the EVM, the board was designed with
devices having 0805 or larger footprints. A production-optimized implementation would likely occupy less
total board space.
for a typical large TFT display. To facilitate user customization of the EVM, the board was designed with
devices having 0805 or larger footprints. A production-optimized implementation would likely occupy less
total board space.
1.2.1
Customizing Power Supply
The user can change each rail’s regulated output voltage by changing the appropriate feedback resistors
per the device data sheet (
per the device data sheet (
). The user is responsible for not exceeding each output’s maximum
voltage specifications. In addition, alternate capacitors, inductors, and/or diodes can be used. When using
alternate capacitors, ensure that at least the minimum recommended capacitance per the data sheet is
used, and that the capacitor voltage rating is appropriate for the application. The switching converters are
designed to be used with ceramic output capacitors. Using nonceramic output capacitors with significantly
large equivalent series resistances (ESR) can result in larger output ripple or unstable operation of the
inductive switching converters. Each charge pump's flying and output capacitors must be ceramic
capacitors. When selecting an alternate inductor, use the data-sheet design equations to ensure that an
appropriate inductance value is selected, and that the inductor current rating is appropriate for the desired
output current. Using an inductor with larger dc resistance results in lower efficiency. When using alternate
diodes, ensure that the diode is rated for both the expected peak current and expected power per the
data-sheet design equations.
alternate capacitors, ensure that at least the minimum recommended capacitance per the data sheet is
used, and that the capacitor voltage rating is appropriate for the application. The switching converters are
designed to be used with ceramic output capacitors. Using nonceramic output capacitors with significantly
large equivalent series resistances (ESR) can result in larger output ripple or unstable operation of the
inductive switching converters. Each charge pump's flying and output capacitors must be ceramic
capacitors. When selecting an alternate inductor, use the data-sheet design equations to ensure that an
appropriate inductance value is selected, and that the inductor current rating is appropriate for the desired
output current. Using an inductor with larger dc resistance results in lower efficiency. When using alternate
diodes, ensure that the diode is rated for both the expected peak current and expected power per the
data-sheet design equations.
Enable 1 (J6) turns on the Vlogic converter. When the power-good threshold of this converter is reached,
DLY1, set by C14, controls the delay time to turn off the negative charge-pump VGL. C14 can be changed
to adjust this delay. Enable 2 (J7) turns on the positive charge-pump VGH. DLY2, set by C24, controls the
delay time to turn on the positive charge pump from the Vlogic-good threshold or EN2 high. C24 can be
changed to adjust the delay.
DLY1, set by C14, controls the delay time to turn off the negative charge-pump VGL. C14 can be changed
to adjust this delay. Enable 2 (J7) turns on the positive charge-pump VGH. DLY2, set by C24, controls the
delay time to turn on the positive charge pump from the Vlogic-good threshold or EN2 high. C24 can be
changed to adjust the delay.
1.2.2
Input to Output Isolation
The nonsynchronous boost converter has a path from input to output, VIN to Vs, through the external
switching diode D3. Transistor Q2 acts as an isolation switch for this path once the device is turned off.
switching diode D3. Transistor Q2 acts as an isolation switch for this path once the device is turned off.
2
TPS65162EVM-278
SLVU228A – October 2007 – Revised October 2009
Copyright © 2007–2009, Texas Instruments Incorporated