Texas Instruments Evaluation Module for TPS51217 20A Synchronous Step Down Controller with DCAP™ Mode TPS51217EVM-533 TPS51217EVM-533 데이터 시트
제품 코드
TPS51217EVM-533
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Test Setup
4.2.1
Input Connections
1. Prior to connecting the DC input source VIN and V5IN, it is advisable to limit the source current from
VIN to 10 A and from V5IN to1A maximum. Make sure VIN and V5IN are initially set to 0 V and
connected as shown in
connected as shown in
.
2. Connect a voltmeter V1 at TP5 (VIN) and TP6 (VIN_GND) to measure the input voltage.
3. Connect a current meter A1 to measure the input current.
4. Connect a voltmeter V2 at TP1 (V5IN) and TP2 (V5IN_GND) to measure the 5-V input voltage.
5. Connect a pulse generator to input 2-bit VID signal for dynamic VOUT control. Make sure CH1 outputs
3. Connect a current meter A1 to measure the input current.
4. Connect a voltmeter V2 at TP1 (V5IN) and TP2 (V5IN_GND) to measure the 5-V input voltage.
5. Connect a pulse generator to input 2-bit VID signal for dynamic VOUT control. Make sure CH1 outputs
250Hz, 3.3-V
P-P
pulse and CH2 outputs 125Hz, 3.3-V
P-P
pulse synchronized with CH1. It is advisable to
set transition time of the leading and trailing edge between 100 ns and 500 ns.
4.2.2
Output Connections
1. Connect load to J4 (VOUT) and J5 (VOUT_GND) and set load to constant resistance mode to sink 0
Adc before VIN is applied.
2. Connect a voltmeter V3 at TP7 (VOUT) and TP8 (VOUT_GND) to measure the output voltage.
4.2.3
Other Connections
Place a fan as shown in
and turn on, making sure air is flowing across the EVM.
4.3
List of Test Points
Table 2. Test Point Functions
TEST
NAME
DESCRIPTION
POINTS
TP1
V5IN
5-V supply
TP2
V5IN_GND
GND for 5-V supply
TP3
PGOOD
Power good
TP4
SW
Switch node
TP5
VIN
VIN supply
TP6
VIN_GND
GND for VIN supply
TP7
VOUT
VOUT
TP8
VOUT_GND
GND for VOUT
7
SLUU420 – MAY 2010
Using the TPS51217EVM-533, High-Performance, Single-Synchronous
Step-Down Controller for Notebook Power Supply
Copyright © 2010, Texas Instruments Incorporated