Datasheet

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Test Setup

4 Test Setup

4.1 Test Equipment

4.1.1 Voltage Source

• VDD: The VDD dc Source1 must be a 0-V to 10-V variable dc source capable of supplying 1 Adc.

• VLDOIN: The VLDOIN DC Source2 must be a 0-V to 10-V variable dc source capable of supplying 10

Adc.

4.1.2 Meters

• V1: dc voltmeter for VDD at TP1 (VDD) and TP2 (GND)

• V2: dc voltmeter for VLDOIN at TP6 (VLDOIN) and TP7 (GND)

• V3: dc voltmeter for VTT at TP3 (VTT) and TP5 (GND)

• V4: dc voltmeter for VTTREF at TP9 (VTTREF) and TP13 (GND)

4.1.3 Load

• LOAD: The VTT load must be an electronic constant-current load capable of 0 A to 10 A at 0.9 Vdc

4.1.4 Oscilloscope

A digital or analog oscilloscope can be used to measure VTT sink/source current transient. The

oscilloscope must be set for 1-MΩ impedance, 20-MHz bandwidth, ac coupling, 200- µs/division horizontal

resolution, 50-mV/division vertical resolution for VTT transient test. Test point TP3 (VTT) and TP5 (GND)

can be used to measure VTT transient. Set horizontal cursor to measure transient load regulation.

4.2 Recommended Wire Gauge

4.2.1 VDD dc Source1 to J1

The connection between the voltage dc Source1 and J1 of the EVM can carry as much as 0.5-Adc

current. The recommended wire size is AWG 18 with the total length of wire less than 4 feet (2-foot input,

2-foot return).

4.2.2 VLDOIN dc Source2 to J4

The connection between the voltage dc Source2 and J4 of the EVM can carry as much as 5-Adc current.

The recommended wire size is AWG 16 with the total length of wire less than 4 feet (2-foot input, 2-foot

return).

4.2.3 VTT Load to J3

The connection between the VTT load and J3 of the EVM can carry as much as 5-Adc current. The

recommended wire size is AWG 16 with the total length of wire less than 4 feet (2-foot input, 2-foot

return).

4.3 Recommended Test Setup

Figure 3 is the recommended test setup to evaluate the TPS51206EVM-745. Working at an ESD

workstation, ensure that any wrist straps, bootstraps, or mats are connected referencing the user to earth

ground before power is applied to the EVM.

SLUU515–August 2011 Using the TPS51206EVM-745, 2-A Peak Sink/Source DDR Termination

Regulator With VTTREF Buffered Reference for DDR2, DDR3, DDR3L, and

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