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Test Procedure

Table 5. VID Bits Selection

(1)

(continued)

VID3 VID2 VID1 VID0 Vout(V)

1 1 0 1 0.925

1 1 1 1 0.875

5.5 Phase Control Selection (PCNT)

The phase control can be set by J10 (PCNT).

Default setting is jumper on pin1 and pin 2 of J10 for Auto phase control.

Table 6. Phase Control Selection

JUMPER SET TO PHASE CONTROL

1-2 pin shorted Auto phase control (around 12-A change to dual phase)

2-3 pin shorted Single phase

No Jumper Dual phase

5.6 1.5-V Output Voltage Selection (J1: 1.5-Vout Selection)

The 1.5-V output can be set by J1 (Vout Select).

Default setting: Jumper shorts on J1 to set 1.25-V output.

Table 7. 1.5-V Output Option Selection

JUMPER SET TO OUTPUT RANGE

No Jumper 1.5-V output

Jumper shorted 4-bits VID with 0.875 V – 1.25 V

6 Test Procedure

6.1 Line/Load Regulation and Efficiency Measurement Procedure

1. Ensure that Load is set to constant resistance mode and to sink 0 Adc.

2. Ensure that the jumper provided in the EVM is set to short on J11 before Vin is applied.

3. Increase Vin from 0 V to 12 V. Using V1 to measure input voltage.

4. Remove the jumper on J11 to enable the controller.

5. Vary Load from 0 Adc to 40 Adc; Vout must remain in load regulation.

6. Vary Vin from 8 V to 14 V; Vout must remain in line regulation.

7. Put the jumper on J11 to disable the controller.

8. Decrease Load to 0 A

9. Decrease Vin to 0 V.

6.2 List of Test Points

Table 8. Functions of Each Test Points

Test Points Name Description

TP1 PMON Power Monitor Output, SeeFigure 8.

TP2 PCNT Phase Control Input

TP3 SW1 Phase 1 Switching Node

TP4 SW2 Phase 2 Switching Node

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

Management IC for 40-A+ Application

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