EPC700 Datasheet, PDF (4/11 Pages) Espros Photonics corp – 24V/50mA General-Purpose Output-Driver

epc700/epc702
Functional Description
Normal Operation
During typical operation the OUT follows the IN as shown in Figure 1. 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 tON and tOFF for the rising and the falling edge
respectively.
IN ⁰
OUT (without HIGH-Z
external Transistor)
VSat
OUT (with
external Transistor)
V_Sat
VDD
t
on
t
off
SHORT ⁰
SENS 0
V
th sens
STATUS HIGH-Z
epc700
STATUS _HIGH-Z
epc702
Figure 1: Normal operation
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 with external driver transistor is shown only.
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 t del 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. epc700 delivers a constant on-signal, whereas epc702
has a flashing output.
IN ⁰
OUT ⁰
SHORT ⁰
SENS ⁰
STATUS ^HIGH-Z
epc700
STATUS ^HIGH-Z
epc702
V
th sens
t
ext
t
del
t
LED
t
LED
t
LED
Figure 2: Short circuit detection
Note: The parameter text used in this paper is described in Figure 7.
Timing diagram operation mode
LST
epc700
05.01.2011
Page 1
File:
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© 2011 ESPROS Photonics Corporation
4
Characteristics subject to change without notice
Datasheet epc700_702 - V2.2
www.espros.ch