Texas Instruments TPS65167 Evaluation Module TPS65167EVM-277 TPS65167EVM-277 Datenbogen
Produktcode
TPS65167EVM-277
www.ti.com
1
Introduction
1.1
Specification
1.2
Modifications
1.2.1
Customizing Power Supply
1.2.2
Input to Output Isolation
Introduction
This section contains background information for the TPS65167EVM-277 evaluation module (EVM).
provides a summary of the TPS65167EVM-277 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
6
12
14
1500
Vs
14.7
15
15.3
1000
VGL
–5.15
–5
–4.85
50
VGH
23.0
23.8
(1)
24.5
50
Vlogic
3.3
2500
Vaux
1.8
500
(1)
Assumes that SUP = V
S
.
The primary goal of this EVM is to facilitate user evaluation of the TPS65167 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.
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.
The user can change the delay time between Vin and EN signal with C30. When Vin exceeds the
undervoltage lockout threshold, the Vlogic and Vaux start up, and C30 begins to charge after delay to EN
goes high and boost converter Vs starts. If EN is connected to REGOUT, then there is no delay.
undervoltage lockout threshold, the Vlogic and Vaux start up, and C30 begins to charge after delay to EN
goes high and boost converter Vs starts. If EN is connected to REGOUT, then there is no delay.
Using capacitor C22 on GDLY pin 25, the delay time between Vs reaching normal value and VGH going
active with CTRL = high can be adjusted also.
active with CTRL = high can be adjusted also.
The nonsynchronous boost converter has a path from input to output, VIN to Vs, through 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.
TPS65167EVM-277
2
SLVU220 – August 2007