SIP32433, SIP32434

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Vishay Siliconix

Revision: 01-Mar-2022

4

Document Number: 62068

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OVERCURRENT LIMIT SETTING

One of the key features of the devices is they provide overcurrent limit protection. The SIP32433A’s and SIP32433B’s current

limit setting resistor RSET can be calculated by the below formula.

The SIP32434A’s and SIP32434B’s RSET follows the formula below:

•RSET is paralleled R5 and R6 on the board

•ILIM is the target current limit setting

PROGRAMMABLE SOFT POWER UP

During soft start, the devices control the output voltage to follow the voltage ramp on the SS pin.

The output slew rate and its set capacitor, CSS, can be calculated by the following formulas:

Where:

•tSS is the soft power up time

•ISS is the built-in current to charge up the CSS; the value is 4.5 μA

•CSS is the soft power setting capacitor shown as C9 on the board

•RSET is the current limit resistor

HOT-PLUG TEST

Connect J3 to an external 5 V power source as the PG bias source.

Hot-plug the power supply between J7 and J14.

Fig. 4 - An Example of Inrush Current Captured on the SIP32433 Series eFuse Evaluation Board

R

SET =

0.6 V

I

LIM

-------------

10 300

×

R

SET =

0.6 V

I

LIM

-------------

20 600

×

V

OUT =

I

INRUSH (mA)

C

OUT (μF)

---------------------------------

C

SS =

I

SS

9

×

SR

-----------------

VIN (5 V/div)

IOUT (2 A/div)

VOUT (5 V/div)

PGD (5 V/div)

10 ms/div