The VI Chip® PRM® Regulator is a high efficiency converter,
operating from a 45.0 to 55.0 Vdc input to generate a regulated
20.0 to 55.0 Vdc output. The ZVS buck-boost topology enables
high switching frequency (~1.03 MHz) operation with high
conversion efficiency. High switching frequency reduces the
size of reactive components enabling power density up to
1676 W/in
3
.
The Half VI Chip® package is compatible with standard pick-
and-place and surface mount assembly processes with a planar
thermal interface area and superior thermal conductivity.
In a Factorized Power Architecture™ system, the PRM and
downstream VTM® current multiplier minimize distribution
and conversion losses in a high power solution, providing an
isolated, regulated output voltage.
The PRM48JH480x250A00 has two selectable modes of
regulation depending on the application requirements.
In Adaptive Loop Operation, the PRM48JH480x250A00 utilizes
a unique feed-forward scheme that enables precise regulation
of an isolated POL voltage without the need for remote sensing
and voltage feedback.
In Remote Sense Operation, the internal regulation circuitry is
disabled, and an external control loop and current sensor
maintain regulation. This affords flexibility in the design of both
voltage and current compensation loops to optimize
performance in the end application.
•
Half VI Chip
®
Package
n
22.0mm x 16.5mm x 6.73mm
•
Optimized for use with PFM® based
Isolated AC-48 V DC Converters
Typical Applications
•
•
•
•
•
High Density Power Supply AC-DC rail outputs
High Density ATE system AC-DC power
Telecom NPU and ASIC core power
Communications Systems
Non-isolated and isolated power converters
PRM® Regulator
Page 1 of 44
Rev 1.0
07/2013
vicorpower.com
800 735.6200
PRM48JH480x250A00
Typical Applications
PRM
ENABLE
TRIM
R
TRIM
AL
SHARE/
CONTROL NODE
VAUX
REF/
REF_EN
VT
VC
AC Front End
SGND
GND
FUSE
PRI_GND
IFB
48 VDC
AC (L)
+OUT
+
+IN
C
IN
–IN
SEC_GND
+OUT
C
OUT
SGND
–OUT
AC
V
IN
V
OUT
20 V to 55 V
MOV
AC (N)
–OUT
PRIMARY
SECONDARY
ISOLATION BOUNDRY
HOLDUP CAPACITOR
SGND
Typical Application: AC-48 VDC Front End + PRM48JH480x250A00
V
REF
PRM
ENABLE
TRIM
AL
SHARE/
CONTROL NODE
VAUX
REF/
REF_EN
VT
VC
IFB
V+
VOUT
+IN
SGND
REF 3312
IN
OUT
GND
SGND
VTM
SGND
AC Front End
GND
FUSE
PRI_GND
SGND
Voltage Reference with Soft Start
VTM Start up Pulse
V–
SGND
TM
VC
PC
+OUT
–IN
C
OUT
+IN
C
F
–IN
PRIMARY
–OUT
SECONDARY
[1]
LOAD
48 VDC
AC (L)
+OUT
+
+IN
+OUT
External Current Sense
AC
V
IN
MOV
AC (N)
–OUT
L
F
–IN
SEC_GND
SGND
–OUT
PRIMARY
SECONDARY
SEC_GND
ISOLATION BOUNDRY
ISOLATION BOUNDRY
HOLDUP CAPACITOR
SGND
Typical Application: AC-48 VDC Front End + PRM48JH480x250A00
+ VTM, non-isolated Remote Sense Configuration
[1]
Non-Isolated Configuration: –Out connected to -IN
PRM® Regulator
Page 2 of 44
Rev 1.0
07/2013
vicorpower.com
800 735.6200
Voltage Sense
Voltage Sense and Error Amplifier
(Differential)
PRM48JH480x250A00
Pin Configuration
SHARE/
CONTROL NODE
TRIM
NC
1
A
C
E
2
B
D
F
ENABLE
NC
AL
TOP VIEW
VT
IFB
REF/REF_EN
A
C
E
3
4
B
D
F
VAUX
SGND
VC
+IN
G
G
+OUT
-IN
H
H
-OUT
Half VIC
Pin Descriptions
Pin
Number
Signal Name
SHARE
A1
(Adaptive Loop / Slave Operation)
CONTROL NODE
(Remote Sense Operation)
VT
(Adaptive Loop Operation)
ENABLE
VAUX
TRIM
IFB
(Remote Sense Operation)
NC
SGND
NC
REF
(Adaptive Loop Operation)
REF_EN
(Remote Sense Operation)
AL
(Adaptive Loop Operation)
VC
+IN
+OUT
-IN
-OUT
Type
BIDIR
INPUT
INPUT
BIDIR
OUTPUT
INPUT
INPUT
n/a
INPUT
n/a
OUTPUT
OUTPUT
INPUT
OUTPUT
INPUT
POWER
OUTPUT
POWER
INPUT
POWER RETURN
OUTPUT
POWER RETURN
Function
Parallel sharing control bus for master-slave configuration.
Modulator control node input. Driven by external error amplifier in Remote Sense
Operation.
VTM TM input for temperature compensation. Leave disconnected for Remote Sense
Operation.
Enables power supply when allowed to float high. 5 V during normal operation.
9 V auxiliary bias voltage.
Selects operating mode. Adjusts output voltage in Adaptive Loop Operation.
Current sense input for current limit and overcurrent protection in Remote Sense Operation.
Leave disconnected for Adaptive Loop Operation.
Do not connect this pin.
Signal ground, reference for analog controls. Kelvin connected internally to –IN and –OUT.
Do not connect this pin.
Reference voltage for internal error amplifier in Adaptive Loop Operation.
Powers and enables external control circuit voltage reference in Remote Sense Operation.
Adaptive loop gain control. Sets the magnitude of the Adaptive Loop load line in Adaptive
Loop Operation. Leave disconnected for Remote Sense Operation.
Bias voltage to power VTM module during start up
Positive input power terminal
Positive output power terminal
Negative input power terminal. Connected internally to -OUT.
Negative output power terminal. Connected internally to -IN.
A3
B2
B4
C1
C3
D2
D4
E1
E3
F2
F4
G1,G2
G3,G4
H1,H2
H3,H4
PRM® Regulator
Page 3 of 44
Rev 1.0
07/2013
vicorpower.com
800 735.6200
PRM48JH480x250A00
Part Ordering Information
Device
PRM
PRM = PRM
Input Voltage
Range
48J
48J = 45.0 V - 55.0 V
Package Type
H
H = Half VIC
SMD
Output Voltage x 10
480
480 = 48.0 V
Temperature Grade
T
T = -40 to 125°C
M = -55 to 125°C
Output Power
250
250 = 250 W
Revision
A
A
Version
00
00 = AL / RS
Standard Models
Part Number
PRM48JH480T250A00
PRM48JH480M250A00
V
IN
45.0 V - 55.0 V
Package Type
Half VIC
SMD
V
OUT
48.0 V
(20.0 V to 55.0 V)
Temperature
-40 to 125°C
-55 to 125°C
Power
250 W
Version
AL / RS
(Pin Selectable)
Absolute Maximum Ratings
The ABSOLUTE MAXIMUM ratings below are stress ratings only. Operation at or beyond these maximum ratings can cause permanent damage to device.
Electrical specifications do not apply when operating beyond rated operating conditions. Operating beyond rated operating conditions for extended period of
time may affect device reliability. All voltages are specified relative to SGND unless otherwise noted. Positive pin current represents current flowing
out of the pin.
Parameter
SHARE / CONTROL NODE
ENABLE
+IN to –IN
VAUX
SGND
IFB
REF / REF _EN
TRIM
AL
VT
VC to –OUT
+OUT to –OUT
Output Current
Internal Operating
Temperature
Storage
Temperature
T Grade
M Grade
T Grade
M Grade
-40
-55
-40
-65
Remote Sense Operation (REF _EN)
Adaptive Loop Operation (REF)
-0.3
-0.3
-0.3
-0.5
-1
-0.5
-0.3
Continuous, non-operating
100 ms, non-Operating
-0.5
Comments
Min
-0.3
-0.3
-1
Max
10.5
+/-10
5.5
+/-10
80
100
10.5
+/-100
+/-100
5.7
3.6
10
3.4
3.6
3.6
4.8
18
+/-1.8
62
7.3
125
125
125
125
Unit
V
mA
V
mA
V
V
V
mA
mA
V
V
mA
mA
V
V
V
V
A
V
A
°C
°C
°C
°C
PRM® Regulator
Page 4 of 44
Rev 1.0
07/2013
vicorpower.com
800 735.6200
PRM48JH480x250A00
Electrical Specifications
Specifications apply over all line and load conditions, and trim from 20.0 V to 55.0 V, unless otherwise noted;
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