Datasheet

TP10(21)TP7(19)

MetalGroundBarrel

Probe Tip

Test Setup

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4 Test Setup

4.1 Test Equipment

Voltage Source VIN: The input voltage source VIN must be a 0-V to 6-V variable dc source capable of

supplying 3 Adc. Connect Vin to J6 as shown in Figure 3.

Multimeters: V1: Vin at TP5 (Vin_MST) and TP8 (GND) V2: 1.5 Vout at TP7 (Vout_MST) and TP10 (GND)

V3: 1.2 Vout at TP19 (Vout_SLV) and TP21 (GND) A1: Vin input current

Output Load:

Load1: The output load1 must be an electronic constant resistance mode load capable of 0 Adc to 5 Adc

at 1.5 V.

Load2: The output load2 must be an electronic constant resistance mode load capable of 0 Adc to 5 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, 1-µs/division horizontal resolution,

20-mV/division vertical resolution. Test points TP7 and TP10 can be used to measure 1.5-V master output

ripple voltage. TP19 and TP21 can be used to measure 1.2-V slave output ripple voltage. Place the

oscilloscope probe tip through TP7 (TP19) and hold the ground barrel TP10 (TP21) as shown in Figure 2.

Do not use a leaded ground connection as this may induce additional noise due to the large ground loop.

Figure 2. Tip and Barrel Measurement for Vout Ripple

Recommended Wire Gauge:

1. Vin to J6: The recommended wire size is AWG 16 per input connection, with the total length of wire

less than 4 feet (2-foot input, 2-foot return).

2. J3 to LOAD1 the minimum recommended wire size is AWG 16, with the total length of wire less than 4

feet (2-foot input, 2-foot return)

3. J8 to LOAD2 the minimum recommended wire size is AWG 16, with the total length of wire less than 4

feet (2-foot input, 2-foot return)

Using the TPS53311EVM-561, a 3-A Eco-mode™ Integrated Switcher With SLUU428A–July 2010–Revised November 2010

Master-Slave

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