VIPER26 STMicroelectronics, VIPER26 Datasheet - Page 18

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VIPER26

Manufacturer Part Number
VIPER26
Description
VIPerPlus family: fixed frequency high performance off line high voltage converter
Manufacturer
STMicroelectronics
Datasheet

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Open loop failure protection
15
18/25
Open loop failure protection
In case the power supply is built in fly-back topology and the VIPer26 is supplied by an
auxiliary winding, as shown in
converter is protected against feedback loop failure or accidental disconnections of the
winding.
The following description is applicable for the schematics of
Figure 28 on page
If R
voltage, V
output through the secondary-to-auxiliary turns ratio.
As the auxiliary voltage increases up to the internal V
reported on
latch threshold, I
generated.
In order to distinguish an actual malfunction from a bad auxiliary winding design, both the
above conditions (drain current equal to the drain current limitation and current higher than
I
If R
voltage V
case of isolated fly-back).
Figure 27. FB pin connection for non-isolated fly-back
DDol
H
L
is opened or R
through VDD clamp) have to be verified to reveal the fault.
is opened or R
REF_FB
OUT
Table 8 on page
, will increase and so the auxiliary voltage, V
DDol
(in case of non isolated fly-back) or to the external TL voltage reference (in
19, respectively the non-isolated fly-back and the isolated fly-back.
L
H
(the value is reported on
is shorted, the VIPer26 works at its drain current limitation. The output
is shorted, the output voltage, V
7) and the clamp current injected on VDD pin exceeds the
Doc ID 17736 Rev 2
Figure 27 on page 18
Table 8 on page
and
DD
OUT
active clamp, V
Figure 28 on page
, will be clamped to the reference
AUX
Figure 27 on page 18
, which is coupled with the
7), a fault signal is internally
DDclamp
19, the
(the value is
and
VIPER26

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