EPC700 EPC [Espros Photonics corp], EPC700 Datasheet - Page 5

• Manufacturer Part Number: EPC700
• Description: 24V/50mA General-Purpose Output-Driver
• Manufacturer: EPC [Espros Photonics corp]

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 t
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 t
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 t
nal switch, the time t
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
minOFF
has to be set to a value that the internal/external switch cannot be damaged by a too high power dissipation. Without an exter -
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File:
minOFF
STATUS
has to be 1,000 times longer than the time t
SHORT
STATUS
epc702
STATUS
epc700
SHORT
SENS
STATUS
SENS
OUT
OUT
SENS
IN
OUT
IN
IN
Timing diagram not enough
overcurrent epc700
0
0
0
0
HIGH-Z
HIGH-Z
ext
Figure 3: Short over-current pulse, i.e., by switching a capacitive load
HIGH-Z
HIGH-Z
plus t
V
th sens
del
, the over-current peak will be ignored.
V
V
t
th sens
ext
th sens
Figure 4: Over-current reset sequence
<t
Figure 5: Over-current status reset
del
t
ext
t
ext
t
del
t
del
del
.
5
LST
t
minOFF
<t
minOFF
t
LED
01.08.2010
Page 1
Datasheet epc700_702 - V2.2
epc700/epc702
minOFF
.
, the device tries
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