Datasheet

Changeable Components and Test Points on the Hot-Swap EVM

1-7

Introduction

Users can increase the current limit by increasing the resistance of the setting

resistor R4 or R13, or by reducing the sense resistance of R1 or R17 for the

respective channel. However, the maximum current should not exceed the

current capability of the external MOSFET and the connectors on the board.

4) Set switch S1 on the interface board to HI to hot-plug the hot-swap board

into the power supplies. If S1 is set to LO when plugging the hot-swap

board into the supplies, the power will not be connected to the loads, be-

cause the TPS2301 is an active-high-enabling device.

5) Test points are provided for oscilloscope probes and/or multimeters.

6) Plug the hot-swap board into the interface board. The key installed be-

tween pins 4 and 5 of the connector insures that the board can only be in-

serted in the correct direction.

1.5 Changeable Components and Test Points on the Hot-Swap EVM

C5, C12 – Load capacitors, vary according to loads.

C7, C10 – Gate capacitors, to further limit inrush current. If load capacitance

C5 or C12 is increased, the respective gate capacitance in the same channel

should be increased accordingly.

C9 – Timing capacitor, a minimum 50-pF capacitor is strongly recommended.

For very heavy load applications, its value must be increased accordingly.

R1, R17 – 0.01 Ω, 1-W sense resistors

R4, R13 – Current-limit-setting resistors

R3, R9. R16, R12, R8, R11 – Output low-voltage-sensing feedback resistors,

R8 is in parallel with R9, and R11 is in parallel with R12. These resistors are

potentiometers that can be used to adjust VSENSE1 or VSENSE2 voltage lev-

els to verify the integrated power-good circuitry works. When using R8 and

R11, R9 and R12 should be removed.

R6 – Not used. EVM users can solder a 10-Ω 1206 resistor to short IN1 and

VREG when IN1 voltage is less than 5.5 V. However, this modification will con-

sume more supply current during shutdown mode.

Test points available on the board are:

GND, IN1, IN2, FAULT, PG1, PG2, VSENSE1, VSENSE2, OUT1, OUT2.