Datasheet

TP9TP8

MetalGroundBarrel

Probe Tip

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Test Setup

4 Test Setup

4.1 Test Equipment

Voltage Source: The input voltage source Vin must be a 0-V to 14-V variable dc source capable of

supplying 10 Adc. Connect Vin to J1 as shown in Figure 3.

Multimeters: A 0-V to 15-V voltmeter must be used to measure Vin at TP6 (Vin) and TP7 (PGND) and a

0-V to 5-V voltmeter for Vout measurement at TP8 (Vout) and TP9 (PGND). A 0-A to 10-A current meter

(A1) as shown in Figure 3 is used for input current measurements.

Output Load: The output load must be an electronic constant resistance mode load capable of 0 Adc to

30 Adc at 1.2 V.

Oscilloscope: A digital or analog oscilloscope can be used to measure the output ripple. The oscilloscope

must be set for 1-MΩ impedance, 20-MHz bandwidth, ac coupling, 2-µs/division horizontal resolution,

50-mV/division vertical resolution. Test points TP8 and TP9 can be used to measure the output ripple

voltage by placing the oscilloscope probe tip through TP8 and holding the ground barrel TP9 as shown in

Figure 2. Using a leaded ground connection may induce additional noise due to the large ground loop.

Figure 2. Tip and Barrel Measurement for Vout Ripple

Fan: Some of the components in this EVM may get hot, approaching temperatures up to 60ºC during

operation. A small fan capable of 200 to 400 LFM is recommended to reduce component temperatures

while the EVM is operating. The EVM must not be probed while the fan is not running.

Recommended Wire Gauge: For VIN to J1 (12-V input) the recommended wire size is 1x AWG 14 per

input connection, with the total length of wire less than 4 feet (2-foot input, 2-foot return). For J2 to LOAD,

the minimum recommended wire size is 2x AWG 14, with the total length of wire less than 4 feet (2-foot

output, 2-foot return).

SLVU346–January 2010 Using the TPS51218EVM-496 High-Performance, Single Synchronous,

Step–Down Controller for High-Current, Eco-mode™ Applications

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