HZZ02002G Datasheet, PDF (14/18 Pages) Power-One – FNP1500/1800 Front-Ends FNR-3 Power Shelves Data Sheet

FNP1500/1800 Front-Ends
& FNR-3 Power Shelf Data Sheet
SUB-D Output Connector Pinout and Signal Specification (Continued)
Output Connector
Description
CLOCK, I²C clock line
Auxiliary power +12 V
(Output 2)
Auxiliary power ground
(Output 2)
Logic Gnd
Output margin PSU 1
Output margin PSU 2
Output margin PSU 3
NC
NC
NC
NC
NC
NC
Pin
Location
25
26
Type
I²C compatible signal
referenced to logic GND
V_o2+ Aux output, insulated from main output
Low level
High level
5 V or 3.3 V logic
27
V_o2- Aux output, insulated from main output
Internally connected over 10 Ω to V_o2-, Auxiliary
28
GND. Wire separately from auxiliary and main output
GND to minimize noise and avoid voltage drops on
signal- and I²C return. Leave open if not used.
29
Open or connected to V _sense-
V _sense- (+8 % V_o1) or V _sense+ (-8 % V_o1)
30
Open or connected to V _sense-
V _sense- (+8 % V_o1) or V _sense+ (-8 % V_o1)
31
Open or connected to V _sense-
V _sense- (+8 % V_o1) or V _sense+ (-8 % V_o1)
32
33
34
35
36
37
V max
I max
60V
60V
60V
Synchronized start-up circuit for paralleling operation
Because of hiccup overcurrent protection, when a supply reaches an overcurrent limit, the output voltage will
immediately turn OFF and after a delay turn ON again. In parallel use, all power supplies have to start synchronized
because of the internal hiccup behavior. Otherwise, the supply which has reached overcurrent first will go to hiccup;
this will overload the other supplies, which then will also go to hiccup. When the first supply has recovered from
hiccup (hiccup dead time), the others remain in hiccup. This will immediately drive the first one into hiccup once
again. This means that without a start-up circuit, a system with several power supplies can never recover from an
overload condition or start-up into full load.
The following additional circuit, required to reach synchronized startup, is already implemented inside the
FNR-3-12G and FNR-3-48G shelves.
BCD.00247 Rev. AA, 07-Nov-12
Page 14 of 18
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