Picor Corporation • picorpower.com

PI2161-EVAL1 User Guide Rev. 1.0

3.

Control Circuitry Bias:

As described in the Functional Description section in

PI2161 datasheet; in a floating application it is

an offset voltage at the PG pin to regulate VC with

respect to PG when the MOSFET is enabled.

expression:

Please refer to application section in the PI2161

datasheet for more details.

4.

Enabling PI2161: PI2161-EVAL1 is set with two

enabling options.

4.1. Mechanical switch (SW1) option. Moving SW1

knob to On position to enable (turn on MOSFET

if conditions are met) PI2161, or moving SW1

knob to Off position to disable (turn off

MOSFET) PI2161.

4.2. Logic input terminal (EN) option: to use this

option slide WS1 knob to Off position. Apply

logic high voltage (>2V) to enable PI2161 and

logic low (<1V) to disable PI2161.

5.

Hook Up of the Evaluation Board

5.1. Connect the positive terminal of PS1 power

supply to Vin+. Connect the ground terminal of

PS1 to Vin-. Set the power supply to 48V. Keep

PS1 output disabled, off.

5.2. Connect the electronic load to the output

between Vout+ and Vout-. Set the load current

to 5A

5.3. Position SW1 knob to On

5.4. Enable (turn on) PS1 power supply output.

5.5. Turn on the electronic load

5.6. Verify that the load voltage (Vout) is few

millivolts below 48V.

This verifies that the

PI2161 MOSFET is in conduction mode.

5.7. Measure VO with respect to Vin-, it should be

10% of Vout, 4.5V.

5.8. Slide SW1 to Off position to disable the output.

5.9. Verify that the load voltage (Vout) is off, about

0V. This verifies that the M1 MOSFET is turned

off. VO voltage should be at 0V.

6.

Over current trip point:

PI2161 has a very fast response (120ns) to over current

fault condition. Measuring a fast disconnect after high

current buildup requires attention to the test set-up. Before

proceeding, consider the following:

6.1. To emulate a real application, the BUS supply for

this test should have a solid output source such

as a DC-DC converter that supply’s high current

and can be connected very close to the

evaluation board. This will reduce stray parasitic

inductance.

Or use the prospective supply

sources of the end application where the PI2161

will be used. Typical bench power supplies have

slow response to output load change. In this test

when the output load is shorted, a high pulse of

Figure 4: Layout configuration for a typical Load Disconnect Switch application test using PI2161.