Texas Instruments Dual Phase Eco-Mode™ Step Down Converter for 40A+ Appllications using the TPS51727 TPS51727EVM TPS51727EVM Fiche De Données

Codes de produits

TPS51727EVM

www.ti.com

Test Procedure

Table 5. VID Bits Selection

(1)

(continued)

VID3

VID2

VID1

VID0

Vout(V)

0.925

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

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, See

Figure 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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