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Application Information (continued)
OVP – Overvoltage Protection
The output Overvoltage Protection set point of the P024F048T12AL is
factory preset for 56 V. If this threshold is exceeded the output shuts
down and a restart sequence is initiated. If the condition that causes
OVP is still present, the unit will again shut down. This cycle will be
repeated until the fault condition is r emoved. The OVP set point may
be set at the factory to meet unique high voltage r equirements.
PRM Output Power Versus VTM Output Power
As shown in Figure 17 the P024F048T12AL is rated to deliver 2.5 A
maximum, when it is delivering an output voltage in the range fr om
26 V to 48 V, and 120 W, maximum, when delivering an output
voltage in the range from 48 V to 55 V. When configuring a PRM for
use with a specific VTM, refer to the appropriate VTM data sheet. The
VTM input power can be calculated by dividing the VTM output power
V?I Chip Regulator
Adjusting Current Limit
The current limit can be lowered by placing an exter nal resistor
between the I L and SG ports (see Figure 18 for resistor values) . With
the I L port open-circuit, the current limit is preset to be within the
range specified in the output specifications table on Page 4.
100.00
10.00
by the VTM efficiency (available from the VTM data sheet). The input
power required by the VTM should not exceed the output power
rating of the PRM.
1.00
0.5
1
1.5
2
2.5
2.55
2.50
2.45
2.40
Desired PRM Output Current Limit (A)
Figure 18 — External resistor value for adjusting current limit
2.35
2.30
2.25
2.20
2.15
0
Safe Operating Area
~ ~
20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60
Factorized Bus Voltage (V f )
Input Fuse Recommendations
A fuse should be incorporated at the input to the PRM, in series with
the +In port. A fast acting fuse, NANO2 FUSE 451/453 Series 10 A
125 V, or equivalent, may be required to meet certain safety agency
Conditions of Acceptability. Always ascertain and observe the safety,
regulatory, or other agency specifications that apply to your specific
application.
Figure 17 — P024F048T12AL rating based on Factorized Bus voltage
Product Safety Considerations
If the input of the PRM is connected to SEL V or ELV circuits, the output
of the PRM can be considered SELV or ELV respectively.
The Factorized Bus voltage should not exceed an absolute limit of
55 V, including steady state, ripple and transient conditions. Exceeding
this limit may cause the inter nal OVP set point to be exceeded.
Parallel Considerations
The PR port is used to connect two PRMs in parallel to form a higher
power array. When configuring arrays, PR port inter connection
terminating impedance is 10 k to SG. See note Page 8 and r efer to
Application Note AN002. Additionally one PRM should be designated
as the master while all other PRMs ar e set as slaves by shorting their
SC pin to SG. The PC pins must be dir ectly connected (no diodes) to
assure a uniform start up sequence. Consult V icor applications
engineering for applications requiring more than two PRMs.
Application Notes
For PRM and V?I Chip application notes on soldering, boar d layout,
and system design please click on the link below:
http://www.vicorpower.com/application-notes
Applications Assistance
Please contact Vicor Applications Engineering for assistance,
1-800-927-9474, or email at apps@vicorpower.com.
vicorpower.com
800-735-6200
V?I Chip Regulator
P024F048T12AL
Rev. 3.1
Page 10 of 14
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