Hi-Rel
Grade
MGDM-04 Series
11- Description of Protections
Vo (%)
11-1 Output Short Circuit Protection (SCP)
100
The short circuit protection device protects the module
against short circuit of any duration and restores the mo-
dule to normal operation when the short circuit is removed.
It operates in «hiccup» mode by testing periodically if an
overload is applied (typically every 200ms recovery time).
The overload detection threshold is typically 200% of maxi-
mum current with a detection time lower than 5ms.
detection time
x
time
recovery time
recovery time
11-2 Output Overvoltage Protection (OVP)
The output overvoltage protection device protects external
components against high voltage or possible overvoltages
which can be supplied by the module (i.e in case of internal
failure). It consists of a zener diode clamping the output
voltage; under worst case conditions this zener diode will
short-circuit.
The output voltage protection is not designed to withstand
externally applied output overvoltages to protect the mo-
dule itself.
4
12- Description of Functions
12-1 On/ Off Function
The control pin 20 (On/ Off) can be used for applications
requiring On/ Off operation. By using an open collector
command with a transistor Q referenced to the common
terminal (Gi) :
On/ Off
• A logic pulled low (<0.2V@1mA, referenced to Gi)
on pin 20 disables the converter
• No connection or high impedance on pin 20 enables
the converter.
Command
GI
By releasing the On/Off function, the converter will restart
within the start-up time specifications given in table page 3.
For further details please consult ‘’Logic On/ Off’’ Applica-
tion Note.
11
Gaia Converter FC97-008.08/ 06 Revision N
©
For locations, phone, fax, E-Mail see back cover
ETC [ ETC ]
