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J1 to LOAD1 and J2 to LOAD2 - The connection between J1 and LOAD1 and J2 and LOAD2 of
TPS53125EVM-599 can carry as much as 4 Adc each. The minimum recommended wire size is AWG
#14, with the total length of wire less than 2 feet (1-foot input, 1-foot return).
5.1.6 Other Test Equipment
Fan – The TPS53125EVM-599 Evaluation Module includes components that can become hot to the touch.
Because this EVM is not enclosed to allow probing of circuit nodes, a small fan capable of 200-400 lfm is
required to reduce component temperatures when operating.
5.2 Equipment Setup
Figure 2 shows the basic test setup that is recommended to evaluate the TPS53125EVM-599. Note that
although the return for J3 and J1 and JP2 are the same system ground, the connections must remain
separate as shown in Figure 2.
5.2.1 Test Procedure
1. When working at an ESD workstation, ensure that wrist straps, bootstraps, or mats are connected
referencing the user to earth ground before power is applied to the EVM. Electrostatic smock and
safety glasses are also recommended.
2. Prior to connecting the dc input source, V
IN
, it is advisable to limit the source current from V
IN
to 3 Adc
maximum. Ensure that V
IN
is initially set to 0 V and connected as shown in Figure 2.
3. Verify SW1 and SW2 are in the desired position.
4. Increase VIN from 0 V to 12 Vdc.
5. Vary VIN between 8 Vdc and 22 Vdc.
6. Vary LOAD1 between 0 A and 4 Adc.
7. Vary LOAD2 between 0 A and 4 Adc.
8. Adjust SW1 between EN and DIS.
9. Adjust SW2 between EN and DIS.
10. Set SW1 to DIS.
11. Set SW2 to DIS.
12. Decrease LOAD1 to 0 A.
13. Decrease LOAD2 to 0 A.
14. Decrease VIN to 0 V.
6
TPS53125EVM-599 SLVU392–July 2010
Copyright © 2010, Texas Instruments Incorporated