Configurations
6.3
External Tracking Selection
The external tracking can be configured by J5. If jumper J5 is shorted, the internal 2-V VREF voltage is
used to set the target output voltage to be 0.6 V. If jumper J5 is open, the external reference between 0.9
V to 4.0 V can be applied to J7. The output voltage will be regulated to ½ of the external reference
voltage. For example, applying 1.5 V to J7, the output voltage is 0.75 V.
6.3.1
Default setting: No External Tracking
Table 4. External Tracking Configuration
Jumper Setting
External Tracking Configuration
Short
No external tracking
Open
External tracking
6.4
Enable Selection
The controller can be enabled and disabled by S1.
6.4.1
Default setting: Switch to disable the controller
Table 5. Enable Selection
Switch Setting
Enable Selection
DIS
Disable the controller
EN
Enable the controller
7
Test Procedure
7.1
Line/Load Regulation and Efficiency Measurement Procedure
1. Set up EVM as described in
2. Ensure Load is set to constant resistance mode and to sink 0 A
DC
.
3. Ensure all jumpers and switch configuration settings per
4. Increase V5IN from 0 V to 5 V. Using V2 to measure V5IN voltage.
5. Increase VIN from 0 V to 1.2 V. Using V1 to measure VIN voltage.
6. Set switch S1 to EN to enable the controller.
7. Use V3 to measure VOUT voltage, A1 to measure VIN current.
8. Vary Load from 0 A
DC
to 6 A
DC
, VOUT should remain in load regulation.
9. Vary VIN from 1.1 V to 1.3 V, VOUT should remain in line regulation.
10. Set switch S1 to DIS to disable the controller.
11. Decrease Load to 0 A.
12. Decrease VIN to 0 V.
13. Decrease V5IN to 0 V.
11
SLUUBD2 – November 2015
TPS53317AEVM-726 D-CAP+™ Mode Synchronous Step-Down Integrated
FETs Converter
Copyright © 2015, Texas Instruments Incorporated