Picor Corporation • picorpower.com

PI2161-EVAL1 User Guide Rev. 1.0

Test Procedure:

Initial Test Set Up

PI2161-EVAL1 is configured for 48V ±10% input bus. The

current limit is set by the sense resistor R1. The sense

resistor is selected (120mΩ) for minimum worst case trip

current of 11.5A at 125°C.

Baseline Test Procedure – PI2161 (Refer to Figure 4)

1.

Recommended Material

1.1. Material Needed-Picor supplied

1.1.1. PI2161-EVAL1

1.1.2.

PI2161 Product Datasheet

1.2. Recommended Users Supplied Equipment

1.2.1. One DC power supply: 0-60V; 15A.

1.2.2. One low power logic voltage power supply

1.2.3. Load: electronic Load, Power resistors or

actual load.

1.2.4. Multimeter.

1.2.5. Oscilloscope.

1.2.6. Appropriately sized interconnect cables.

1.2.7. Safety glasses.

Before initial power-up follow these steps to configure

the evaluation board for specific end application

requirement:

2.

Sense resistor (Rs) selection

2.1. In a typical load switch application the sense

resistor (Rs), R1 in the PI2161-EVAL1, is selected

based on a minimum trip current to allow

maximum

normal

load

current

without

interruption. The sense resistor value can be

determined from Overcurrent trip vs. sense

resistor chart in Figure 3:

Please refer to PI2161 Datasheet for more details on

how to calculate the sense resistor value verses trip

current.

Note: Make sure that output capacitor inrush current is

less than two times the minimum set trip current.

Output capacitor inrush current is function of the

output capacitor value and output voltage rise time.

Figure 3: PI2161 Overcurrent trip vs. sense resistor chart

40

50

60

70

80

90 100 110 120 130 140 150 160 170 180 190 200

8

10

12

14

16

18

20

22

24

26

28

30

32

Sense Resistor [mΩ]