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EPC703-CSP6 Datasheet(PDF) 5 Page - Espros Photonics corp

Part # EPC703-CSP6
Description  24V/50mA General-Purpose Output-Driver
Download  11 Pages
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Manufacturer  EPC [Espros Photonics corp]
Direct Link  http://www.espros.ch
Logo EPC - Espros Photonics corp

EPC703-CSP6 Datasheet(HTML) 5 Page - Espros Photonics corp

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He
epc701/epc703
Current Peak at OUT
A short current peak when OUT is turned on, typically generated by a capacitive load, could trigger the short-circuit protection logic. However,
if the current peak is shorter than text plus tdel, the over-current peak will be ignored.
Make sure that the energy drawn by such a current peak does not destroy the internal/external output transistor.
Over-current Reset Sequence
If there is a permanent short circuit at OUT, such short circuit will be detected and OUT is turned off. After a waiting time tminOFF, the device tries
to turn on OUT again. If the short circuit is still present, OUT is immediately turned off again. This sequence continues until the short circuit is
removed or IN goes to LOW or power is turned off. This mode is called self-healing since the device tries to self-heal the short circuit end to
switch back into normal operation. As a consequence in the case of a permanent over-current, short current peaks are issued into the load,
respectively short.
The time tminOFF has to be set to a value that the internal/external switch cannot be damaged by a too high power dissipation. Without an exter -
nal switch, the time tminOFF has to be at least 1,000 times longer than the time t del.
If one wants to reduce the waiting time in case of a short circuit situation, it can be done by simply taking IN to a low state and then to high
again. Please refer to the timing diagram in Figure 5. However, make sure that the maximum power dissipation of the chip or the external
switching transistor will never be exceeded above the allowed maximum.
© 2011 ESPROS Photonics Corporation
Characteristics subject to change without notice
5
Datasheet epc701_703 - V2.2
www.espros.ch
Figure 3: Short over-current pulse, i.e., by switching a capacitive load
Timing diagram not enough
overcurrent epc700
LST
V
th sens
<t
del
t
ext
IN
OUT
STATUS
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
.
V
DD
Figure 4: Over-current reset sequence
Timing diagram normal overcurrent
release epc700
LST
V
th sens
t
del
t
ext
IN
OUT
STATUS
epc701
SHORT
SENS
t
minOFF
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
0
0
0
V
DD
t
LED
HIGH-Z
Figure 5: Over-current status reset
Timing diagram reset overcurren
epc700
Lukas Steinemann
V
th sens
t
del
t
ext
IN
OUT
STATUS
SHORT
SENS
<t
minOFF
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
.
V
DD


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