Datasheet

TP8TP7

MetalGroundBarrel

Probe Tip

Test Setup

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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 20 Adc. Connect Vin to J2 as shown in Figure 4.

Multimeters: A 0-V to 14-V voltmeter must be used to measure Vin at TP5 (Vin) and TP6 (GND). A 0-V to

5-V voltmeter must be used for Vout measurement at TP7(Vout) and TP8(GND). A 0-A to 20-A current

meter (A1) as shown in Figure 4 is used for input current measurements.

Output Load: The output load must be an electronic constant resistance mode load capable of 0 A to 50

Adc at 1.5 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, 1-µs/division horizontal resolution,

20-mV/division vertical resolution. Test points TP7 and TP8 can be used to measure the output ripple

voltage by placing the oscilloscope probe tip through TP7 and holding the ground barrel TP8 as shown in

Figure 3. Using a leaded ground connection may induce additional noise due to the large ground loop.

Figure 3. Tip and Barrel Measurement for Vout Ripple

Fan: Some of the components in this EVM may get hot and approach temperatures of 60ºC during

operation. A small fan capable of 200-400 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 J2(12-V input) the recommended wire size is 2x AWG 14 per

input connection, with the total length of wire less than 4 feet (2-foot input, 2-foot return). For J3, J4 to

LOAD, the minimum recommended wire size is 4x AWG 14, with the total length of wire less than 4 feet

(2-foot output, 2-foot return).

Using the TPS51727EVM, a Dual-Phase, Eco-mode™ Step-Down Power SLUU379–November 2009

Management IC for 40-A+ Application

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