Enables a 48 V to 1.5 V, 345 A isolated, regulated
solution with total footprint of 3.3in
2
(21cm
2
)
Flexible “Remote Sense” architecture optimizes
regulation / feedback loop design to fit application
requirements
Current Feedback signal allows dynamic adjustment
of current limit setpoint
6.36 MHrs MTBF (MIL-HDBK-217Plus Parts Count)
DESCRIPTION
The VI Chip PRM
®
Regulator is a high efficiency
converter, operating from a 38 to 55 Vdc input to
generate a regulated 5 to 55 Vdc output. The ZVS Buck
– Boost topology enables high switching frequency (~1
MHz) operation with high conversion efficiency. High
switching frequency reduces the size of reactive
components enabling power density up to 2,072 W/in
3
.
The full 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
PRM48BF480T600A00
and
downstream
VTM™
transformer minimize distribution and conversion losses
in a high power solution.
An external control loop and current sensor maintain
regulation and enable flexibility both in the design of
voltage and current compensation loops to control of
output voltages and currents.
TYPICAL APPLICATIONS
High Efficiency Server Processor and Memory Power
High Density ATE system DC-DC power
Telecom NPU and ASIC core power
LED drivers
High Density Power Supply DC-DC rail outputs
Non-isolated power converters
48 V to 1.5 V, 230A Voltage Regulator
Voltage
Control
Feedback
Enable/
Disable
PC
+IN
PR
TM
+OUT
Voltage
Reference
PC
+IN
+OUT1
+OUT2
38 to 55
Vdc Input
-IN
VIZ0051
PRM
IF RE
-OUT
SG VC
-IN
VIV0007TFJ
VC
-OUT1
-OUT2
Load
Current
Sense
Constant
Vc
PC
+IN
+OUT1
+OUT2
VIV0007TFJ
-IN
VC
-OUT1
-OUT2
PRM®
Regulator
Page 1 of 22
Rev 1.2
07/2015
vicorpower.com
800 927.9474
PRM48Bx480y600A00
1.0 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. All voltages are specified relative to SG unless otherwise noted. Positive pin current represents current flowing
out of the pin.
2.0 ELECTRICAL CHARACTERISTICS
Specifications apply over all line and load conditions, T
J
= 25 ºC and output voltage from 20V to 55V, unless otherwise
noted.
Boldface specifications apply over the temperature range of -40 ºC < T
J
< 125 ºC (T-grade).
PRM® Regulator
Page 2 of 22
Rev 1.2
07/2015
vicorpower.com
800 927.9474
PRM48Bx480y600A00
3.0 SIGNAL CHARACTERISTICS
Specifications apply over all line and load conditions, T
J
= 25 ºC and Output Voltage from 20V to 55V, unless otherwise
noted.
Boldface specifications apply over the temperature range of -40 ºC < T
J
< 125 ºC (T-grade).
Voltage Source
VS
• Intended to power feedback components and/or auxiliary circuits.
• 9 V, 5mA regulated voltage source
• With > 5% output load, VS ripple typically 100mV
Signal Type
State
Attribute
VS Voltage
Regular
VS Available Current
Operation
Analog Output
VS Voltage Ripple
Transition
VS Capacitance (External)
VS Fault Response Time
Symbol
V
VS
I
VS
V
VS_PP
C
VS_EXT
T
FR_VS
Conditions / Notes
Min
8.55
5
Typ
9.00
100
30
Max
9.45
400
0.04
Unit
V
mA
mV
F
s
Iout = 0A, Cvs_ext=0. Maximum specification
includes powertrain operation in burst mode.
From fault recognition to VS = 1.5 V
Reference Enable
RE
• RE signals succesfull startup and powertrain ready to operate
• Intended to power and enable the feedback circuit reference
• 3.3V, 8mA regulated voltage source
Signal Type
State
Attribute
RE Voltage
Regular
RE Available Current
Operation
RE Regulation
Analog Output
Transition
RE Voltage Ripple
PC to RE Delay
RE Capacitance (External)
VS to RE Delay
Symbol
V
RE
I
RE
%
RE
V
RE_PP
T
PC_RE
C
RE_EXT
T
VS_RE
Conditions / Notes
Min
3.0
8.0
Typ
3.3
2.5
100
100
Max
3.6
Unit
V
mA
%
mV
s
F
ms
across load and temperature
in burst mode
Fault detected
VS = 8.1 V to RE high, V
IN
> V
IN_UVLO-
0.1
1
Control Node
PR
• Modulator control node input
• 0.5mA constant current sink when externally driven
• 0.79V, up to 2mA voltage source when externally pulled low
Signal Type
State
Attribute
PR Voltage Active Range
PR Source Current
Regular
Analog Input
Operation
PR Sink Current
PR Resistance to SG
Symbol
V
PR
I
PR
I
PR_Low
R
PR
Conditions / Notes
V
PR
0.79V
V
PR
0.79V
Min
0.79
250
Typ
Max
7.40
2
750
Unit
V
mA
A
kΩ
500
93.3
Current Feedback
IF
• A voltage proportional to the PRM output current must be supplied externally to the IF pin in order for the device to properly protect overcurrent events and to enable output current limit (clamp)
• Overcurrent protection trip will cause instantaneous powertrain disable, latched after T
BLNK
Signal Type
State
Conditions / Notes
Min
Typ
Max
Attribute
Symbol
V
IN
= 45 V; T
J
= 25 °C
V
IF_IL
Current Limit (clamp) Threshold
1.90
2.00
2.10
Not Production Tested; Guaranted by Design;
V
IF_OC
Regular
2.58
2.69
2.80
Overcurrent Protection Threshold
Analog Input
T
J
= 25 °C
Operation
R
IF
IF Input Impedance
2.13
2.11
2.15
BW
IL
Current Limit Bandwidth
2
Unit
V
kΩ
kHz
PRM® Regulator
Page 3 of 22
Rev 1.2
07/2015
vicorpower.com
800 927.9474
PRM48Bx480y600A00
Temperature Monitor
TM
• The TM pin monitors the internal temperature of the PRM analog control IC to within ±5 °C.
• Room temperature setpoint is ~ 3 V, approximate gain is 10 mV/°C.
• "Power Good" flag to verify that the PRM is operating
Signal Type
State
Attribute
Symbol
V
TM
TM Voltage
V
TM_AMB
TM Voltage reference
Regular
Analog Output
V
VS_PP
TM Voltage Ripple
Operation
I
TM
TM Available Current
A
TM
TM Gain
Digital Output [Fault Flag]
Fault or Standby TM Disabled Current
I
TM_DIS
Conditions / Notes
Full temperature range
T
J
= 27 °C
powertrain in burst mode
Min
2.12
2.94
100
Typ
3.00
200
10
Max
4.04
3.06
Unit
V
V
mV
A
mV/°C
DC state with TM Voltage +/- 0.5V. This is a high
impedance state.
0.0
mA
Signal Ground
SG
• All control signals must be referenced to this pin, with the exception of VC
• SG is internally connected to -IN and -OUT
Signal Type
State
Attribute
Analog Input / Output
Any
Maximum Allowable Current
Symbol
I
SG
Conditions / Notes
Min
-100
Typ
Max
100
Unit
mA
VTM Control
VC
• Used to synchronize start up of downstream VTM converter.
• 14V nominal, 10ms voltage pulse
• If not used, must be resistively terminated to -OUT
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