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MP028F036M12AL
Application Information (continued)
OVP – Overvoltage Protection
The output Overvoltage Protection set point of the MP028F036M12AL
is factory preset for 55 V. If this threshold is exceeded the output shuts
down and a restart sequence is initiated, also indicated by PC pulsing.
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 removed.
The OVP set point may be set at the factory to meet unique high
Adjusting Current Limit
The current limit can be lowered by placing an external resistor
between the I L and SG ports (see Figure 20 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.
voltage requirements.
1000
22uF (ESR >= 1.7Ω) & 33uf (ESR>= 1.35Ω) & 47uF (ESR >= 1.1Ω) - NO IL TRIM
10uF (ESR >= 2.40Ω)
PRM Output Power Versus VTM Output Power
As shown in Figure 19, the MP028F036M12AL is rated to deliver 3.3 A
maximum, when it is delivering an output voltage in the range from
26 V to 36 V, and 120 W, maximum, when delivering an output
voltage in the range from 36 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
by the VTM efficiency (available from the VTM data sheet). The input
100
10
0uF
power required by the VTM should not exceed the output power rating
of the PRM.
1
75%
80%
85%
90%
95%
100%
4.00
3.80
3.60
3.40
3.20
% Percentage of Current Limit Setpoint
Figure 20 — R IL vs percentage of current limit. Shaded areas shown
minimum valid R IL as a function of load capacitance and ESR.
3.00
2.80
2.60
2.40
2.20
2.00
1.80
Safe Operating
Area
- 0.066 A / V
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.
0
~ ~
20 22
24 26
28 30
32 34
36 38
40 42
44 46
48 50
52 54 56
Product Safety Considerations
Factorized Bus Voltage (V F )
Figure 19 — MP028F036M12AL rating based on Factorized Bus voltage
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 internal OVP set point to be exceeded.
If the input of the PRM is connected to SELV or ELV circuits, the output
of the PRM can be considered SELV or ELV respectively.
If the input of the PRM is connected to a centralized DC power system
where the working or float voltage is above SELV, but less than or
equal to 75 V, the input and output voltage of the PRM should be
classified as a TNV-2 circuit and spaced 1.3 mm from SELV circuitry or
accessible conductive parts according to the requirements of
UL60950-1, CSA 22.2 60950-1, EN60950-1, and IEC60950-1.
Parallel Considerations
The PR port is used to connect two PRMs in parallel to form a higher
power array. When configuring arrays, PR port interconnection
terminating impedance is 10 k to SG. See note Page 8 and refer to
Application Note AN002. Additionally one PRM should be designated
as the master while all other PRMs are set as slaves by shorting their
SC pin to SG. The PC pins must be directly connected (no diodes) to
assure a uniform start up sequence. Consult Vicor applications
engineering for applications requiring more than two PRMs.
Application Notes
For PRM and VI Chip ? application notes on soldering, board layout,
and system design please click on the link below:
http://www.vicorpower.com/technical_library/application_information/chips                                                          /
Applications Assistance
Please contact Vicor Applications Engineering for assistance,
1-800-927-9474, or email at apps@vicorpower.com.
PRM ? Regulator 28 Vdc Input
Page 10 of 14
Rev 3.5
1/2013
vicorpower.com
800 735.6200
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