PI2127-EVAL1 User Guide

Rev. 1.0

Reference Designator

Value

Functional Description

C1, C2, C3, C4

Not installed

Snubber to reduce voltage ringing when the device turns off

C3

22μF

Output (Load) Capacitor

C6

2.2uF

Output (Load) Capacitor

D1, D2

LED

To indicate a fault exists when it is on

Q1, Q2

FJV1845

Constant Current bias circuit

R1, R2

Not Installed

R3, R4

2.8K

Constant Current bias circuit, sets the current limiting

R5, R6,

1.5KΩ

LED current limit resistor, selected to operate at 3.3V and 5.0V logic voltage. Replace R5

and R6 with the proper resistor value for different logic voltage.

R7, R8

100K

Constant Current bias circuit

U1, U2

PI2127-01-LGIZ

Cool-ORing® SiP.

Table 3: Component functional description

Test Procedure:

Initial Test Set Up

PI2127-EVAL1 designed with two bias circuit options,

bias resistor RPG (R1 and R2) and constant current

circuit.

The constant current circuits are installed;

where R1 and R2 were not installed.

Leave enable inputs (EN1 and EN2) unconnected

(open).

Baseline Test Procedure – PI2127 (Refer to Figure 3)

1.

Recommended Material

1.1. Material Needed-Picor supplied

1.1.1. PI2127-EVAL1

1.1.2.

PI2127 Product Datasheet

1.2. Recommended Users Supplied Equipment

1.2.1. Two DC power supplies: 0-60V; 15A each.

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

requirements:

2.

EN inputs:

2.1. Enable inputs (EN1 and EN2) were left

unconnected (open). PI2127 devices will be

enabled while enable pins are open. To disable

PI2127, connecting the enable input to return

(Vin-) with a hard wire or with an active device

(Transistor or MOSFET). Leave EN1 and EN2

unconnected for the initial test.

3.

Control Circuitry Bias:

3.1. The PI2127 control circuitry and the gate driver

for the internal MOSFET are biased through the S

pin. An internal regulator clamps the S pin

typically.

Current bias circuit is required if the voltage at

the S pin is higher than the minimum Voltage

PI2127-EVAL1 has both

circuits laid out, but the constant current bias

installed.