EPC701 datasheet(4/11 Pages) EPC

4 / 11 page

epc701/epc703

Functional Description

Normal Operation

During typical operation the OUT follows the IN as shown in Figure 1. In the the other state (when IN is set to high level), the internal switch is

closed pulling the OUT pin to VDD. As long as the output current does not exceed the current threshold, OUT is stable ON and STATUS is

stable HIGH-Z. The delay from IN to OUT is defined as t ON and tOFF for the rising and the falling edge respectively.

Please note that the status of the pin OUT is dependent whether the chip is operated with or without external driver transistor. In the

subsequent diagrams, the version without external driver transistor is shown only.

Note: The parameter text used in this paper is described in Figure 7.

Over-current Sequence

A short on the load side will lead to an over-current through OUT. If an over-current stays longer than the time tdel and text, OUT is turned off as

shown in the figure below. At the same time STATUS changes its state to indicate an over-current situation to an external controller. STATUS

can also be used to drive directly an indicator LED due to its 10mA driving capability. epc701 delivers a constant on-signal, whereas epc703

has a flashing output.

Characteristics subject to change without notice

Datasheet epc701_703 - V2.2

www.espros.ch

Figure 1: Normal operation

Timing diagram operation mode

epc700

LST

OUT (without

external Transistor

STATUS

epc700

SHORT

SENS

HIGH-Z

05.01.2011

Page 1

File:

This document is confidential and protected by law and international trades. It must not be shown to any third party nor be copied in any form without our written permission

05.01.2011

Page 1

File:

This document is confidential and protected by law and international trades. It must not be shown to any third party nor be copied in any form without our written permission

LED

STATUS

epc702

VDD

HIGH-Z

th sens

HIGH-Z

VDD-

⎮V

Sat⎮

off

OUT (with

external Transistor

VDD

Figure 2: Short circuit detection

Timing diagram typical overcurrent

epc700

LST

th sens

del

ext

OUT

STATUS

epc701

SHORT

SENS

HIGH-Z

05.01.2011

Page 1

File:

This document is confidential and protected by law and international trades. It must not be shown to any third party nor be copied in any form without our written permission

STATUS

epc703

LED

HIGH-Z

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