PRMTM Regulator Rev 1.4
Page 1 of 44 11/2015
vicorpower.com
800 927.9474
High Efficiency Converter
S
NRTL
C US
PRMTM Regulator
00A004x084yA84MRP
Features
•48.0 V input (36.0 V to 75.0 V),
non-isolated ZVS buck-boost regulator
•20.0 V to 55.0 V adjustable output range
•400 W output power in 1.11 in2footprint
•97.5% typical efficiency, at full load
•1383 W/in3(84 W/cm3) Power Density
•4.01 MHrs MTBF (MIL-HDBK-217 Plus Parts Count)
•Pin selectable operating mode
Adaptive Loop
Remote Sense / Slave
•Full VI Chip®Package
32.5mm x 22.0mm x 6.73mm
Typical Applications
•High Density Power Supply DC-DC rail outputs
•High Density ATE system DC-DC power
•Telecom NPU and ASIC core power
•Communications Systems
•Non-isolated and isolated power converters
Product Description
The VI Chip® PRMTM
Regulator is high eciency converter,
operating from a 36.0 to 75.0 Vdc input to generate a regulated
20.0 to 55.0 Vdc output. The ZVS buck-boost topology enables
hgih htiw noitarepo )zHM30.1 ~( ycneuqerf gnihctiws hgih
conversion e ciency. High switching frequency reduces the
size of reactive components enabling power density up to
1383 W/in3.
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 PRM and
downstream VTMTM
current multiplier minimize distribution
and conversion losses in a high power solution, providing an
isolated, regulated output voltage.
The PRM48Ay480x400A00 has two selectable modes of
regulation depending on the application requirements.
In Adaptive Loop Operation, the PRM48Ay480x400A00 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 a ords flexibility in the design of both
voltage and current compensation loops to optimize
performance in the end application.
Product Ratings
VIN = 36.0 V to 75.0 V POUT = 400 W
VOUT = 48.0 V IOUT = 8.33 A
(20.0 V to 55.0 V Trim)
Rev 1.4 PRMTM Regulator
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PRM48Ay480x400A00
PRM
ENABLE
TRIM
SHARE/
CONTROL NODE
AL
IFB
VC
VT
VAUX
REF/
REF_EN
+IN
–IN
+OUT
–OUT
TM
VC
PC
VOUT
+IN
–IN –OUT
+OUT
Adaptive Loop Temperature Feedback
VTM Start Up Pulse
SGND
SGND
GND
SGND
R
TRIM
ON/OFF
CONTROL
SGND
VF: 20 V to 55 V
ISOLATION BOUNDRY
SEC_GND
VTM
PRIMARY SECONDARY
CIN CF
COUT
Vin
LF
R
AL
External Current Sense
GND
SGND
ON/OFF
CONTROL
SGND
SGND
GND
Voltage Reference with Soft Start
Voltage Sense and Error Amplifier
(Differential)
VTM Start up Pulse
SGND
IN OUT
GND
V
REF
V +
VOUT
–IN+IN
V –
PRM
ENABLE
TRIM
SHARE/
CONTROL NODE
AL
IFB
VC
VT
VAUX
REF/
REF_EN
+IN
–IN
+OUT
–OUT
SGND
SGND
TM
VC
PC
+IN
–IN –OUT
+OUT
ISOLATION BOUNDRY
VTM
PRIMARY SECONDARY
CIN CF
COUT
REF 3312
[1] [1]
VIN
LF
SGND
Voltage Sense
SGND
LOAD
Typical Applications
[1] Non-Isolated Configuration: –Out connected to -IN
Typical Application: PRM48Ay480x400A00 + VTM, non-isolated Remote Sense Configuration
Typical Application: PRM48Ay480x400A00 + VTM Adaptive Loop Configuration
Rev 1.4PRMTM Regulator
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800 927.9474
PRM48Ay480x400A00
1234
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
SHARE/
CONTROL NODE
ENABLE
TRIM
NC
NC
AL
VT
VAUX
IFB
SGND
REF/REF_EN
VC
+IN
-IN
+OUT
-OUT
TOP VIEW
Full VIC SMD
Pin Configuration
Rev 1.4 PRMTM Regulator
Page 4 of 44 11/2015
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800 927.9474
PRM48Ay480x400A00
Pin
Number Signal Name Type Function
SHARE
A1, A2 (Adaptive Loop / Slave Operation) BIDIR Parallel sharing control bus for master-slave configuration.
CONTROL NODE Modulator control node input. Driven by external error amplifier in Remote Sense
(Remote Sense Operation) INPUT Operation.
A3, A4 VT INPUT VTM TM input for temperature compensation. Leave disconnected for Remote Sense
(Adaptive Loop Operation) Operation.
B1, B2 ENABLE BIDIR Enables power supply when allowed to float high. 5 V during normal operation.
B3, B4 VAUX OUTPUT 9 V auxiliary bias voltage.
C1, C2 TRIM INPUT Selects operating mode. Adjusts output voltage in Adaptive Loop Operation.
C3, C4 IFB INPUT Current sense input for current limit and overcurrent protection in Remote Sense Operation.
(Remote Sense Operation) Leave disconnected for Adaptive Loop Operation.
D1, D2 NC n/a Do not connect this pin.
D3, D4 SGND INPUT Signal ground, reference for analog controls. Kelvin connected internally to –IN and –OUT.
E1, E2 NC n/a Do not connect this pin.
REF
E3, E4 (Adaptive Loop Operation) OUTPUT Reference voltage for internal error amplifier in Adaptive Loop Operation.
REF_EN
(Remote Sense Operation) OUTPUT Powers and enables external control circuit voltage reference in Remote Sense Operation.
F1, F2 AL INPUT Adaptive loop gain control. Sets the magnitude of the Adaptive Loop load line in Adaptive
(Adaptive Loop Operation) Loop Operation. Leave disconnected for Remote Sense Operation.
F3, F4 VC OUTPUT Bias voltage to power VTM module during start up
G1,G2 +IN INPUT Positive input power terminal
POWER
G3,G4 +OUT OUTPUT Positive output power terminal
POWER
H1,H2 -IN INPUT Negative input power terminal. Connected internally to -OUT.
POWER RETURN
H3,H4 -OUT OUTPUT Negative output power terminal. Connected internally to -IN.
POWER RETURN
Pin Descriptions
Rev 1.4PRMTM Regulator
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800 927.9474
Device Input Voltage
Range Package Type Output Voltage x 10 Temperature Grade Output Power Revision Version
PRM 48A F 480 T 400 A 00
PRM = PRM 48A = 36.0 V - 75.0 V F = Full VIC SMD 480 = 48.0 V T = -40 to 125°C 400 = 400 WA 00 = AL / RS
T = Full VIC TH M = -55 to 125°C
Part Ordering Information
Part Number VIN Package Type VOUT Temperature Power Version
PRM48AF480T400A00 36.0 V - 75.0 V Full VIC 48.0 V -40 to 125°C 400 W AL / RS
PRM48AF480M400A00 SMD (20.0 V to 55.0 V) -55 to 125°C (Pin Selectable)
PRM48AT480T400A00 36.0 V - 75.0 V Full VIC 48.0 V -40 to 125°C 400 W AL / RS
PRM48AT480M400A00 TH (20.0 V to 55.0 V) -55 to 125°C (Pin Selectable)
Standard Models
Parameter Comments Min Max Unit
SHARE / CONTROL NODE -0.3 10.5 V
+/-10 mA
ENABLE -0.3 5.5 V
+/-10 mA
+IN to –IN Continuous, non-operating -1 90 V
100 ms, non-Operating 100 V
VAUX -0.5 10.5 V
+/-100 mA
SGND +/-100 mA
IFB -0.5 5.7 V
-0.3 3.6 V
REF / REF _EN Remote Sense Operation (REF _EN) 10 mA
Adaptive Loop Operation (REF) 3.4 mA
TRIM -0.3 3.6 V
AL -0.3 3.6 V
VT -0.3 4.8 V
VC to –OUT -0.5 18 V
+/-1.8 A
+OUT to –OUT -1 62 V
Output Current 12.5 A
Internal Operating T Grade -40 125 °C
Temperature M Grade -55 125 °C
Storage T Grade -40 125 °C
Temperature M Grade -65 125 °C
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.
PRM48Ay480x400A00
Rev 1.4 PRMTM Regulator
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800 927.9474
PRM48Ay480x400A00
Electrical Specifications
Specifications apply over all line and load conditions, and trim from 20.0 V to 55.0 V, unless otherwise noted; Boldface specifications apply over the
temperature range of -40ºC < TINT < 125ºC; All Other specifications are at TINT = 25ºC unless otherwise noted.
Attribute Symbol Conditions / Notes Min Typ Max Unit
Power Input Specification
Input Voltage Range VIN Continuous, operating 36.0 48.0 75.0 V
VIN Slew Rate dVIN /dt 0 ≤VIN ≤75.0 V 0.001 1000 V/ms
Initialization Voltage VINIT Internal micro controller initialization voltage 10 V
Initialization Delay tINIT From VIN first crossing VINIT 5.0 7.0 9.0 ms
No Load Power Dissipation PNL ENABLE HIGH, VIN = 48.0 V 2.4 3.5 W
Input Quiescent Current IQC ENABLE LOW, VIN = 48.0 V 14.5 20.0 mA
Input Current IIN_DC IOUT = 8.33 A, VIN = 48.0 V, VOUT = 48.0 V 8.6 8.8 A
Input Capacitance (Internal) CIN_INT Effective value, VIN = 48.0 V (see Fig. 13)6µF
Input Capacitance (Internal) ESR RCIN Effective value, VIN = 48.0 V 1.5 mΩ
Power Output Specification
Rated Output Current IOUT Standalone and Master Operation, see Figure 1, SOA 8.33 A
Rated Output Power POUT Standalone and Master Operation, see Figure 1, SOA 400 W
VIN = 48.0 V VOUT = 48.0 V,
Switching Frequency FSW
IOUT = 4.17 A, TINT = 25°C 0.94 1.03 1.07 MHz
Over line, load, trim and temperature, 0.70 1.07 MHz
exclusive of burst mode
From VIN first crossing VIN_UVLO+_SUPV 20 µs
Output Turn-ON Delay tON to ENABLE high; tINIT expired
From ENABLE pin release to ENABLE high, VIN applied, tOFF expired 20 µs
Start up Sequence Timeout tSTARTUP_SEQ From ENABLE high to start up sequence complete 17 ms
VIN = 48.0 V, VOUT = 48.0 V, IOUT = 8.33 A, TINT = 25°C 96.5 97.5 %
VIN = 48.0 V, VOUT = 48.0 V, IOUT = 4.17 A, TINT = 25°C 95.8 96.7 %
Efficiency Ambient ηAMB VIN = 36.0 V to 75.0 V, 96.0 %
VOUT = 48.0 V, IOUT = 8.33 A, TINT = 25°C
VIN = 36.0 V to 75.0 V,
IOUT = 8.33 A, TINT = 25°C, over trim 92.0 %
VIN = 48.0 V, VOUT = 48.0 V,
IOUT = 8.33 A, TINT = 100°C 96.3 97.3 %
VIN = 48.0 V, VOUT = 48.0 V,
IOUT = 4.17 A, TINT = 100°C 95.8 96.8 %
Efficiency Hot ηHOT VIN = 36.0 V to 75.0 V , VOUT = 48.0 V,
IOUT = 8.33 A, TINT = 100°C 95.0 %
VIN = 36.0 V to 75.0 V , IOUT = 8.33 A,
TINT = 100°C, over trim 91.0 %
Efficiency Over Temperature η>50% load and VOUT = 48.0 V; over temperature 95.0 %
>50% load; over temperature and trim 90.0 %
Output Discharge current IOD Average Value 0.5 mA
Output Voltage Ripple VOUT_PP
VIN = 48.0 V, VOUT = 48.0 V,
IOUT = 8.33 A, COUT_EXT = 0 F, 20 MHz BW 650 1000 mV
Output Inductance (Parasitic) LOUT_PAR Frequency @ 1.03 MHz, Simulated J-Lead model 1.9 nH
Output Capacitance (Internal) COUT_INT Effective value, VOUT = 48.0 V (see Fig.13)6µF
Output Capacitance (Internal) ESR RCOUT Effective value, VOUT = 48.0 V 1.5 mΩ
Rev 1.4PRMTM Regulator
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800 927.9474
PRM48Ay480x400A00
Electrical Specifications (cont.)
Specifications apply over all line and load conditions, and trim from 20.0 V to 55.0 V, unless otherwise noted; Boldface specifications apply over the
temperature range of -40ºC < TINT < 125ºC; All Other specifications are at TINT = 25ºC unless otherwise noted.
Attribute Symbol Conditions / Notes Min Typ Max Unit
Power Output Specifications: Adaptive Loop Operation
Output Voltage Setpoint VOUT_SET No load, trim Inactive, Adaptive Loop load line inactive 47.00 48.00 49.00 V
Output Voltage Trim Range VOUT 20.0 55.0 V
Output Voltage Rise Time tRISE_VOUT From soft start initiated to output voltage settled 1.7 1.8 1.9 ms
Output Voltage Load Regulation VOUT_REG_LOAD Adaptive loop load line inactive 0.02 0.2 %
Output Voltage Line Regulation VOUT_REG_LINE Adaptive loop load line inactive 0.02 0.2 %
Total Regulation Error VOUT_REG_TOTAL PRM output voltage, Adaptive Loop load line inactive 0.2 %
VTM output voltage, total Adaptive Loop regulation, 13%
Total AL Regulation Error VOUT_REG_AL
VOUT = 48.0 V, trim inactive
VTM output voltage, total Adaptive Loop regulation, 5%
trim active, exclusive of external resistor tolerances
VIN = 48.0 V, VOUT = 48.0 V, TINT = 25°C, constant 8.5 10.0 12.3 A
Output Current Limit ILIMIT current limit after supervisory limit detection time tLIM_SUPV
Over line, load, trim and temperature 8.0 12.5 A
Load Capacitance (Electrolytic) CLOAD_ALEL
0.1 Ω≤ESR ≤1Ω, See Figure 32,
total capacitance (CLOAD_ALEL + CLOAD_CER) ≤47 µF 47 µF
Load Capacitance (Ceramic) CLOAD_CER 2mΩ≤ESR ≤200 mΩ, See Figure 32 25 µF
Load Transient Voltage Deviation VTRANS
10% ↔100% load step, 10 A/µsec, 0 µF COUT
,4.8 V
deviation from initial setpoint
10% ↔100% load step, 10 A/µsec, 0 µF COUT
,
Recovery to 90% of final value, Adaptive Loop 100 µs
Load Transient Recovery Time tTRANS
load line inactive
10% ↔100% load step, 10 A/µsec, 0 µF COUT
,
Recovery to 90% of final value, 500 µs
Adaptive Loop load line active, VAL = 1.20 V
Power Output Specifications: Slave Operation with AL Master
Slave Operation within an array, up to 5°C case 6.7 A
Rated Current Within an Array IOUT_ARRAY
temperature differential, master-slave configuration
Slave Operation within an array, up to 30°C case 5.8 A
temperature differential, master-slave configuration
Slave Operation within an array, up to 5°C case 320 W
Rated Power Within an Array POUT_ARRAY
temperature differential, master-slave configuration
Slave Operation within an array, up to 30°C case 280 W
temperature differential, master-slave configuration
Equal input, and output voltage at full load; 15 %
VIN = 48.0 V, VOUT = 48.0 V
Equal input and output voltage at full load;
Current Sharing Difference IOUT_SHARE_MS
Over line and trim, with 25°C ≤TC≤100°C and ≤5°C 15 %
(Master to Slave) part-part temp. mismatch
Equal input, and output voltage at full load;
Over line and trim, with 25°C ≤TC≤100°C 20 %
and ≤30°C part-part temp. mismatch
Rev 1.4 PRMTM Regulator
Page 8 of 44 11/2015
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800 927.9474
PRM48Ay480x400A00
Electrical Specifications (cont.)
Specifications apply over all line and load conditions, and trim from 20.0 V to 55.0 V, unless otherwise noted; Boldface specifications apply over the
temperature range of -40ºC < TINT < 125ºC; All Other specifications are at TINT = 25ºC unless otherwise noted.
Attribute Symbol Conditions / Notes Min Typ Max Unit
Power Output Specifications: Slave Operations (cont.)
Equal input, output, and SHARE voltage at full load;
VIN = 48.0 V, VOUT = 48.0 V 5%
Equal input, output and SHARE voltage at full load;
Current Sharing Difference IOUT_SHARE_SS
Over line and trim, with 25°C ≤TC≤100°C 10 %
(Slave to Slave) and ≤5°C part-part temp. mismatch
Equal input, output, and SHARE voltage at full load;
Over line and trim, with 25°C ≤TC≤100°C 15 %
and ≤30°C part-part temp. mismatch
Maximum Array Size NPRMS_PARALLEL
Maximum number of parallel devices, 5PRMs
master-slave configuration
Power Output Specifications: Remote Sense Operation
Output Voltage Range VOUT 20.0 55.0 V
Remote Sense Operation within an array, 7.5 A
Rated Current Within an Array IOUT_ARRAY
up to 5°C case temperature differential
Remote Sense Operation within an array, 5.8 A
up to 30°C case temperature differential
Remote Sense Operation within an array, 360 W
Rated Power Within an Array POUT_ARRAY
up to 5°C case temperature differential
Remote Sense Operation within an array, 280 W
up to 30°C case temperature differential
Equal input, output, and CONTROL NODE voltage 5%
at full load; VIN = 48.0 V, VOUT = 48.0 V
Equal input, output and CONTROL NODE voltage at
full load; Over line and trim, with 25°C ≤TC≤100°C 10 %
Current Sharing Difference IOUT_SHARE_RS and ≤5°C part-part temp. mismatch
Equal input, output, and CONTROL NODE voltage at
full load; Over line and trim, 15 %
with 25°C ≤TC ≤100°C and ≤30°C
part-part temp. mismatch (worst case)
Maximum Array Size NPRMS_PARALLEL
Maximum number of parallel devices, Remote Sense 10 PRMs
configuration, CONTROL NODE externally driven
Rev 1.4PRMTM Regulator
Page 9 of 44 11/2015
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800 927.9474
PRM48Ay480x400A00
Electrical Specifications (cont.)
Specifications apply over all line and load conditions, and trim from 20.0 V to 55.0 V, unless otherwise noted; Boldface specifications apply over the
temperature range of -40ºC < TINT < 125ºC; All Other specifications are at TINT = 25ºC unless otherwise noted.
Attribute Symbol Conditions / Notes Min Typ Max Unit
Powertrain Protections
Input Undervoltage Turn-ON VIN_UVLO+ 30.9 33.0 V
Input Undervoltage Turn-OFF VIN_UVLO- Instantaneous powertrain shutdown, detected after tBLANK 26.0 28.8 V
Input Undervoltage Hysteresis VUVLO_HYST (VIN_UVLO+) - (VIN_UVLO-)1.9 2.2 2.4 V
Input Overvoltage Turn-ON VIN_OVLO- 79.6 82.9 V
Input Overvoltage Turn-OFF VIN_OVLO+ Instantaneous powertrain shutdown, detected after tBLANK 84.6 88.8 V
Input Overvoltage Hysteresis VOVLO_HYST (VIN_OVLO+) - (VIN_OVLO-)1.6 2.0 2.4 V
Output Overvoltage Threshold VOUT_OVP+ Instantaneous shutdown, detected after tPROT 56.0 58.3 60.1 V
Minimum Current Limited Vout VOUT_UVP 12 V
Overtemperature Shutdown Setpoint TINT_OTP Instantaneous shutdown, detected after tPROT 125 ºC
Output Power Limit PPROT 400 W
Short Circuit VOUT Threshold VSC_VOUT 8.8 V
Short Circuit VOUT Recovery Threshold VSC_VOUTR 9.5 V
Short Circuit CONTROL NODE Threshold VSC_VCN 7.2 V
Short Circuit CONTROL NODE VSC_VCNR 6.9 V
Recovery Threshold
Short Circuit Timeout tSC
Short circuit fault detected after VSC_VOUT
and VSC_VCN thresholds persist for this time 5 ms
Short Circuit Recovery Time tSCR Excludes tOFF 75
