Datasheet

Test Procedure

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

6. Remove the jumper on J3 to enable the controller.

7. Use V2 to measure Vout voltage.

8. Vary Load from 0-25 Adc; Vout must remain in load regulation.

9. Vary Vin from 8 V to 14 V, Vout must remain in line regulation.

10. Put the jumper on J3 to disable the controller.

11. Decrease Load to 0 A.

12. Decrease Vin to 0 V.

7.2 Control Loop Gain and Phase Measurement Procedure

TPS53219EVM-690 contains a 10-Ω series resistor in the feedback loop for loop response analysis.

1. Set up EVM as described in Section 5 and Figure 3.

2. Connect isolation transformer to test points marked TP9 and TP10.

3. Connect input signal amplitude measurement probe (channel A) to TP9. Connect output signal

amplitude measurement probe (channel B) to TP10.

4. Connect ground lead of channel A and channel B to TP11.

5. Inject approximately 40-mV or less signal through the isolation transformer.

6. Sweep the frequency from 100 Hz to 1 MHz with 10 Hz or lower post filter. The control loop gain and

phase margin can be measured.

7. Disconnect isolation transformer from bode plot test points before making other measurements. (Signal

injection into feedback may interfere with accuracy of other measurements.)

7.3 List of Test Points

Table 6. Functions of Each Test Points

Test Points Name Description

TP1 VREG 6.2-V LDO Output

TP2 PGOOD Power Good

TP3 EN Enable pin

TP4 DRVH High-side driver output

TP5 DRVL Low-side driver output

TP6 MODE Soft-start and Auto skip/FCCM selection pin

TP7 Vin Vin

TP8 GND GND for Vin

TP9 CHA Input A for loop injection

TP10 CHB Input B for loop injection

TP11 GND GND

TP12 GND GND

TP13 VDD Controller power supply input

TP14 Vout Output Voltage

TP15 GND GND for output voltage

7.4 Equipment Shutdown

1. Shut down Load.

2. Shut down Vin.

3. Shut down FAN.

Using the TPS53219EVM-690 Wide-Input Voltage, Eco-mode™, Single, SLVU431–January 2011

Synchronous, Step-Down Controller

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