Datasheet

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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 Figure 3.

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

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 Figure 3 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

SLUU420–MAY 2010 Using the TPS51217EVM-533, High-Performance, Single-Synchronous

Step-Down Controller for Notebook Power Supply