SG6520SZ datasheet(10/13 Pages) FAIRCHILD

Part #	SG6520SZ

Description	PC Power Supply Supervisors

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

Direct Link	http://www.fairchildsemi.com

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Product Specification

PC Power Supply Supervisors

SG6520

- 10 -

www.sg.com.tw • www.fairchildsemi.com

Version 1.0.1 (IAO33.0041.B0)

September 28, 2007

APPLICATION NOTE

Over Current Protection (OCP)

The SG6520 provides over current protection for the

3.3V, 5V and two 12V rails. Whenever an OCP

condition occurs at any of the voltage rails, PGO will be

low and FPO will be open. The internal OCP

comparators have a very small offset voltage (±5mV).

The sink currents of IS33, IS5, IS12 and IS12B are 8

times the current at the RI pin. The current at the RI pin

is VRI/Ri. Here is an example demonstrating how to set

the over current protection.

If I1*R1>(IRI*8)*R2, than OCP active.

How to select R2 Resistor:

If R1 =5mΩ, Ri=30K, OCP Protection Level is 35A, than

R2 = (I1*R1)/(IRI*8)

= (35A*5mΩ)/{(1.25V/30K)*8}

= 525Ω

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