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DOC-MN-007-03 VCCM600 User Manual
Vox Power Limited | Unit 2, Red Cow Interchange Estate, Ballymount, Dublin 22, D22 Y8H2, Ireland | T +353 1 4591161 | www.vox-power.com
Power Good Signals (PG1-PG4 [Output])
Each output module provides a power good (PG) signal to indicate when the output voltage is above approximately 90% of the pre-set voltage for that module.
Each PG signal on an output module is internally connected through an opto-isolator to the
signals circuit, which provides and open collector output, as shown.
The LED on the front of each module gives a visual confirmation of the PG status.
Note that remote adjustments of the output voltage using the V
CONTROL
and I
CONTROL
pins do
not change the PG signal threshold. The PG threshold is always approximately 90% of the
voltage set with the manual potentiometer.
Output Inhibits (INH1-INH4 [Input])
The signals circuit provides an inhibit input to disable each output module individually. Each inhibit input is internally connected through an opto-isolator to the
respective output modules. The basic internal electrical circuit and timing diagrams are shown below.
Internal circuit
Timing: Typically, t
OFF
= 100 μs and t
ON
= 8 ms.
Internal Temperature sensor (T
SNS
[Output])
An internal temperature sensor is embedded in the transformer module. The output voltage of this sensor gives a measurement of the internal transformer
temperature
and can be used to control external cooling systems or to provide a warning of impending over temperature protection. The sensor output voltage
is related to temperature as follows,
V = 0.4 + 0.0195*T
The sensor will accurately measure temperatures in the range -10⁰C to +125⁰C.
The internal temperature should never exceed 120⁰C (2.74V)
-20
0
20
40
60
80
100
120
0
0.5
1
1.5
2
2.5
T
SNS
output voltage Vs Internal Temperature
