Datasheet

Test Procedure

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5 Test Procedure

5.1 Line/Load Regulation and Efficiency Measurement Procedure

1. Ensure the load is set to constant resistance mode and to sink 0 Adc.

2. Ensure SW1 on the EVM is at OFF position before VIN and V5IN are applied.

3. Increase VIN from 0 V to 8 V. Use V1 to measure input voltage.

4. Increase V5IN from 0 V to 5 V. Use V2 to measure input voltage.

5. Turn SW1 to ON position to enable the controller.

6. Vary the load from 0 Adc to 20 Adc; VOUT must remain in load regulation.

7. Vary VIN from 8 V to 20 V; VOUT must remain in line regulation.

8. Decrease the load to 0 A.

9. Turn SW1 to OFF position to disable the controller.

10. Decrease V5IN to 0 V.

11. Decrease VIN to 0 V.

5.2 List of Test Points

Table 2. Functions of Each Test Point

Test Point Name Description

TP1 VREF VREF voltage

TP2 REFIN REFIN voltage

TP3 PGOOD Power good

TP4 EN Output enable

TP5 ILOAD Built-in dynamic load current

TP6 GND GND for ILOAD

TP7 SW Switch node

TP8 GND GND for SW

TP9 V5IN 5V supply

TP10 V5IN_GND GND for 5-V supply

TP11 VIN VIN supply

TP12 VIN_GND GND for VIN supply

TP13 VCC_PCH Output for VCC_PCH

TP14 VCC_PCH_GND GND for VCC_PCH

TP15 VCCIO VCCIO

TP16 VCCIO_GND GND for VCCIO

J6-1 GSNS Differential sensing (low)

J6-2 VSNS Differential sensing (high)

5.3 Equipment Shutdown

1. Shut down the load.

2. Shut down V5IN and VIN.

3. Shut down the fan.

6 Performance Data and Typical Characteristic Curves

Figure 5 through Figure 13 present typical performance curves for TPS51219EVM-630.

Using the TPS51219EVM-630 High-Performance, Single, Synchronous, SLUU818–April 2012

Step-Down Controller for Notebook Power Supply

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