PI2007-EVAL1 datasheet(6/10 Pages) VICOR

6 / 10 page

Picor Corporation • picorpower.com

PI2007-EVAL1 User Guide Rev. 1.1

Page 6 of 10

Before initial power-up follow these steps to configure

the evaluation board for specific end application

requirements:

EN inputs:

2.1. The enable inputs (EN1 and EN2) were left

unconnected (open). PI2007 devices will be

enabled when the enable pins are open. To

disable the PI2007, connect the enable input to

return (Rtn) with a wire or with an active device

(Transistor or MOSFET). Leave EN1 and EN2

unconnected for the initial test.

Control Circuitry Bias:

3.1. The PI2007 control circuitry and the gate driver

for the MOSFET are biased through the VC pin.

An internal regulator clamps VC pin voltage

with respect to the PG pin (VC-PG), to 11.7V

typically. A bias resistor RPG (R1 and R2) or a

Constant Current bias circuit is required if the

voltage at the VC pin is higher than the

minimum Voltage Clamp (VVC-CLM, 11V). PI2007-

EVAL1 has both circuits laid out. The constant

current bias circuit components are installed

while RPG is not installed.

3.2. If RPG is desired instead of the constant current

bias circuit to save components: remove the

constant current bias circuit components from

the evaluation board.

The constant current

bias circuit components for upper ORing (U1)

are Q7, R5, R7 and D7, the constant current

bias circuit components for lower ORing (U2)

are Q8, R6, R8 and D8. The RPG value can be

selected using the following equations:

And RPG maximum power dissipation is:

Where:

VC pin minimum applied voltage (Vin to

Rtn)

VC pin maximum applied voltage (Vin to

Rtn)

: Controller maximum clamp voltage,

12.5V

: Controller minimum clamp voltage, 11V

Controller maximum bias current, use

2.0mA

0.1mA is added for margin

RPG calculation example

Vin (minimum) = 40V and Vin (maximum) = 50V

Hook Up of the Evaluation Board

4.1. Connect the positive terminal of PS1 power

supply to Vin1. Connect the ground terminal of

PS1 to its local Rtn. Set the power supply to 48V.

Keep PS1 output disabled, off.

4.2. Connect the positive terminal of PS2 power

supply to Vin2. Connect the ground terminal of

PS2 to its local Rtn. Set the power supply to 48V.

Keep PS2 output disabled, off.

4.3. Connect the logic power supply PS3 positive

terminal to VL1 and VL2. Connect the ground

terminal of this power supply to a Rtn terminal.

Set the power supply to the desired logic voltage

level, 3.3V or 5V. Keep PS3 output disabled, off.

4.4. Connect the electronic load to the output

between Vout and its local Rtn. Set the load

current to 5A.

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

4.6. Enable (turn on) PS3 power supply output.

4.7. Turn on the electronic load.

4.8. Verify that the electronic load voltage reading

increases to a few millivolts below 48V. This

verifies that the MOSFET Q1 is in conduction

mode.

PI2007-EVAL1 bảng dữ liệu(PDF) 6 Page - Vicor Corporation

PI2007-EVAL1 bảng dữ liệu(HTML) 6 Page - Vicor Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10

bảng dữ liệu tải về

Link URL