MCC Datasheet, PDF (6/9 Pages) XP Power Limited – 400 W Regulated Output

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Alarm Section
Local DC OK
The alarm is available on pins 6 and 4 of the output signal connector for output voltages ≥5 VDC. It monitors the individual outputs
and gives a signal which is opto isolated to indicate the status. The signal is logic high when OK and a pull up resistor limiting the
current to 20mA can be connected to the output voltage. Also an LED for indication can be connected to the pins as shown below.
R
6
+ VOUT
R = Vout - 1, 2
4
0.02
- VOUT
Figure 5. LED Connection for indicating DC OK status
Global DC OK
The alarm is based around the four window comparators from the local DC OK which sums them so if any output fails a failure is
indicated. It is available on pins 1 (collector) and 14 (emitter) of the input connector CN1 and it is TTL high when OK. Similar to the local
DC OK the signal is opto isolated and requires a pull up resistor connected to input or output voltage limiting the current to 20 mA.
External Hold Up Capacitor
To MCC600 CN2
1
External Holdup +
2
6
External Holdup Return
7
N/C 3
Auxiliary Output + ⁴
5
Auxiliary Output Return ⁸
9
D1
25 A / 50 V
C1 C2 C3 C4 C5
R1 10 W
(43 W Surge)
T = ^{(C + 2.2 x 10-3) (Vin2 - 324)}
2 x Pin
Where:
C = External capacitance in farads (i.e 0.01 Farad = 10000 μF)
Vin = Nominal input voltage
Pin = Output power / efficiency
T = Time in seconds
Figure 6. External hold up circuit
6