VICOR VT048A096M025FP

VTM TM Current Multiplier
Features
Size:
1.91 x 1.09 x 0.37 in
48,6 x 27,7 x 9,5 mm
• 100°C baseplate operation
• ZVS / ZCS isolated sine amplitude converter
• 48 V to 9.6 V Converter
• Typical efficiency 96%
• 25 A (37.5 A for 1 ms)
• <1 µs transient response
• High density – up to 312 W/in3
• Isolated output
• Small footprint – 1.64 and 2.08 in2
• No output filtering required
• Height above board – 0.37 in (9.5 mm)
• Lead free wave solder compatible
• Low weight – 1.10 oz (31.3 g)
• Agency approvals
Applications
• Solid state lighting
Product Overview
• Stadium displays
The thermally enhanced VI BRICK VTM current multiplier excels at speed, density and
• Industrial controls
efficiency to meet the demands of advanced power applications. Combined with the
• Avionics
VI BRICK PRM regulator they create a DC-DC converter with flexibility to provide isolation
• Underseas
and regulation where needed. The PRM can be located with the VTM at the point of load
• RF Amplifiers
or remotely in the back plane or on a daughter card.
• Microprocessor and DSP
requiring fast response
Part Numbering
VT
048
A
096
T
Voltage
Transformation
Module
Input
Voltage
Designator
Package
Size
Output
Voltage
Designator
(=VOUT x10)
025
T=
M=
Voltage Transformation Module
VT048A096T025FP
Operating
P
Baseplate
Pin Style
Output
Current
Designator
(=IOUT)
Product Grade Temperatures (°C)
Grade
F
Storage
-40 to +100 -40 to +125
-55 to +100 -65 to +125
vicorpower.com
F = Slotted flange
T = Transverse heat sink[a]
[a] Contact
P = Through hole
factory
Rev. 1.0
Page 1 of 11
SPECIFICATIONS
Electrical characteristics apply over the full operating range of input voltage, output load (resistive) and baseplate temperature,
unless otherwise specified. All temperatures refer to the operating temperature at the center of the baseplate.
Absolute Maximum Ratings
Parameter
+In to -In
+In to -In
PC to -In
VC to -In
+Out to -Out
Isolation voltage
Output current
Peak output current
Output power
Peak output power
Values
-1.0 to 60
100
-0.3 to 7.0
-0.3 to 19.0
-0.5 to 16
2,250
25
37.5
268
401
-40 to +100
-55 to +100
-40 to +125
-65 to +125
Operating temperature
Storage temperature
Unit
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
A
A
W
W
°C
°C
Notes
For 100 ms
Input to output
Continuous
For 1 ms
Continuous
For 1 ms
T-Grade; baseplate
M-Grade; baseplate
T-Grade
M-Grade
°C
°C
Note: Stresses in excess of the maximum ratings can cause permanent damage to the device. Operation of the device is not implied at these or any other conditions
in excess of those given in the specification. Exposure to absolute maximum ratings can adversely affect device reliability.
Input Specifications
(Conditions are at 48 Vin, full load, and 25°C ambient unless otherwise specified)
Parameter
Input voltage range
Min
Typ
Max
Unit
Notes
32
48
55
Vdc
Max VIN = 53 V, operating from -55°C to -40°C
1
V/µs
Input dV/dt
Input overvoltage turn-on
55.0
Vdc
Input overvoltage turn-off
59.5
Vdc
Input current
5.4
Adc
Input reflected ripple current
140
No load power dissipation
3.1
Internal input capacitance
4.0
Internal input inductance
Voltage Transformation Module
VT048A096T025FP
mA p-p
4.1
W
5
nH
Using test circuit in Figure 10; See Figure 1
µF
vicorpower.com
Rev. 1.0
Page 2 of 11
SPECIFICATIONS (CONT.)
Output Specifications
Parameter
Output voltage
Rated DC current
(Conditions are at 48 Vin, full load, and 25°C ambient unless otherwise specified)
Min
Typ
Max
Unit
Note
6.40
11.0
Vdc
No load
6.10
10.7
Vdc
Full load
0
25
Adc
32 - 55 VIN
37.5
A
Peak repetitive current
Max pulse width 1ms, max duty cycle 10%,
baseline power 50%
Short circuit protection set point
33.0
Current share accuracy
Adc
5
10
Module will shut down
%
See Parallel Operation on Page 7
Efficiency
Half load
95.5
96.2
%
See Figure 3
Full load
95.5
96.2
%
See Figure 3
Internal output inductance
1.6
nH
Internal output capacitance
55
µF
Output overvoltage setpoint
11.0
Effective value
Vdc
Module will shut down
Output ripple voltage
No external bypass
176
10 µF bypass capacitor
17
Effective switching frequency
200
3.0
3.1
3.4
0.1980
1/5
0.2020
8.9
12.0
mVp-p
See Figures 2 and 5
mVp-p
See Figure 6
MHz
Fixed, 1.6 MHz per phase
Line regulation
K
VOUT = K•VIN at no load
Load regulation
ROUT
mΩ
See Figure 13
Transient response
Voltage overshoot
92
mV
25 A load step with 100 µF CIN; See Figures 7 and 8
Response time
200
ns
See Figures 7 and 8
Recovery time
1
µs
See Figures 7 and 8
WAVEFORMS
Ripple vs. Output Current
Output Ripple (mVpk-pk)
180
160
140
120
100
80
60
40
0
2.5
5
7.5
10
12.5
15
17.5
20
22.5
25
Output Current (A)
Figure 1 — Input reflected ripple current at full load and 48 Vf.
Figure 2 — Output voltage ripple vs. output current at 48 Vf with no POL
bypass capacitance.
Voltage Transformation Module
VT048A096T025FP
vicorpower.com
Rev. 1.0
Page 3 of 11
SPECIFICATIONS (CONT.)
WAVEFORMS
Power Dissipation
Efficiency vs. Output Current
10
98
Power Dissipation (W)
Efficiency (%)
96
94
92
90
88
86
9
8
7
6
5
4
3
2
84
0
2.5
5
7.5
10
12.5
15
17.5
20
22.5
0
25
Output Current (A)
2.5
5
7.5
10
12.5
15
17.5
20
22.5
25
Output Current (A)
Figure 3 — Efficiency vs. output current.
Figure 4 — Power dissipation vs. output current.
Figure 5 — Output voltage ripple at full load and 48 Vf with no POL bypass
Figure 6 — Output voltage ripple at full load and 48 Vf with 10 µF ceramic
capacitance.
POL bypass capacitance and 20 nH distribution inductance.
Figure 7 — 0-25 A load step with 100 µF input capacitance and no output
Figure 8 — 25-0 A load step with 100 µF input capacitance and no output
capacitance.
capacitance.
Voltage Transformation Module
VT048A096T025FP
vicorpower.com
Rev. 1.0
Page 4 of 11
SPECIFICATIONS (CONT.)
General Specifications
Parameter
Min
Typ
Max
Unit
Notes
Mhrs
25°C, GB
Vdc
Input to output
pF
Input to output
MΩ
Input to output
MTBF
MIL-HDBK-217F
3.5
Isolation specifications
Voltage
2,250
Capacitance
3,000
Resistance
10
Agency approvals
cTÜVus
UL /CSA 60950-1, EN 60950-1
CE Mark
Low voltage directive
RoHS
Mechanical
See Mechanical Drawings, Figures 15, 16
Weight
1.10/31.3
oz /g
Length
1.91/48,6
in / mm
Baseplate model
Width
1.09/27,7
in / mm
Baseplate model
Height
0.37/9,5
in / mm
Baseplate model
Dimensions
Thermal
Over temperature shutdown
125
130
135
°C
Thermal capacity
23.8
Ws /°C
Baseplate-to-ambient
7.7
°C / W
Baseplate-to-ambient; 1000 LFM
2.9
°C / W
Baseplate-to-sink; flat, greased surface
0.40
°C / W
Baseplate-to-sink; thermal pad
0.36
°C / W
Junction temperature
Auxiliary Pins
Parameter
Min
Typ
Max
Unit
DC voltage
4.8
5.0
5.2
Vdc
Module disable voltage
2.4
2.5
Notes
Primary Control (PC)
Module enable voltage
Current limit
2.4
Disable delay time
Vdc
2.5
2.6
Vdc
VC voltage must be applied when module is
enabled using PC
2.5
2.9
mA
Source only
µs
PC low to Vout low
20
VTM Control (VC)
External boost voltage
12
External boost duration
Voltage Transformation Module
14
19
10
VT048A096T025FP
vicorpower.com
Vdc
Required for VTM start up without PRM
ms
Vin > 32 Vdc. VC must be applied continuously
if Vin < 32 Vdc.
Rev. 1.0
Page 5 of 11
PIN / CONTROL FUNCTIONS
+In / -In DC Voltage Ports
The VTM input should not exceed the maximum specified. Be aware of this
limit in applications where the VTM is being driven above its nominal output voltage. If less than 32 Vdc is present at the +In and -In ports, a continuous VC voltage must be applied for the VTM to process power. Otherwise
VC voltage need only be applied for 10 ms after the voltage at the +In and
-In ports has reached or exceeded 32 Vdc. If the input voltage exceeds the
overvoltage turn-off, the VTM will shutdown. The VTM does not have
internal input reverse polarity protection. Adding a properly sized diode in
series with the positive input or a fused reverse-shunt diode will provide
reverse polarity protection.
TM – For Factory Use Only
VC – VTM Control
The VC port is multiplexed. It receives the initial VCC voltage from an
upstream PRM, synchronizing the output rise of the VTM with the output
rise of the PRM. Additionally, the VC port provides feedback to the PRM to
compensate for the VTM output resistance. In typical applications using
VTMs powered from PRMs, the PRM’s VC port should be connected to the
VTM VC port.
Figure 9 — VI BRICK VTM pin configuration (viewed from pin side)
In applications where a VTM is being used without a PRM, 14 V must be
supplied to the VC port for as long as the input voltage is below 32 V and
for 10 ms after the input voltage has reached or exceeded 32 V. The VTM is
not designed for extended operation below 32 V. The VC port should only be
used to provide VCC voltage to the VTM during startup.
PC – Primary Control
The Primary Control (PC) port is a multifunction port for controlling the
VTM as follows:
Disable – If PC is left floating, the VTM output is enabled. To
disable the output, the PC port must be pulled lower than 2.4 V,
referenced to -In. Optocouplers, open collector transistors or relays
can be used to control the PC port. Once disabled, 14 V must be
re-applied to the VC port to restart the VTM.
Primary Auxiliary Supply – The PC port can source up to 2.4 mA
at 5 Vdc.
+Out / -Out DC Voltage Output Ports
The output and output return are through two sets of contact locations.
The respective +Out and –Out groups must be connected in parallel with
as low an interconnect resistance as possible. Within the specified input
voltage range, the Level 1 DC behavioral model shown in Figure 13 defines
the output voltage of the VTM. The current source capability of the VTM is
shown in the specification table.
To take full advantage of the VTM, the user should note the low output
impedance of the device. The low output impedance provides fast transient response without the need for bulk POL capacitance. Limited-life
electrolytic capacitors required with conventional converters can be
reduced or even eliminated, saving cost and valuable board real estate.
Voltage Transformation Module
VT048A096T025FP
vicorpower.com
Rev. 1.0
Page 6 of 11
APPLICATION NOTES & TEST CIRCUIT
Parallel Operation
In applications requiring higher current or redundancy, VTMs can be
operated in parallel without adding control circuitry or signal lines. To
maximize current sharing accuracy, it is imperative that the source and
load impedance on each VTM in a parallel array be equal. If VTMs are
being fed by an upstream PRM, the VC nodes of all VTMs must be connected to the PRM VC.
To achieve matched impedances, dedicated power planes within the PC
board should be used for the output and output return paths to the
array of paralleled VTMs. This technique is preferable to using traces of
varying size and length.
The VTM power train and control architecture allow bi-directional power
transfer when the VTM is operating within its specified ranges. Bi-directional power processing improves transient response in the event of an
output load dump. The VTM may operate in reverse, returning output
power back to the input source. It does so efficiently.
Anomalies in the response of the source will appear at the output of the
VTM, multiplied by its K factor of 1/5 . The DC resistance of the source
should be kept as low as possible to minimize voltage deviations on the
input to the VTM. If the VTM is going to be operating close to the high
limit of its input range, make sure input voltage deviations will not trigger the input overvoltage turn-off threshold.
Input Fuse Recommendations
VI BRICKs are not internally fused in order to provide flexibility in configuring power systems. However, input line fusing of VI BRICKs must
always be incorporated within the power system. A fast acting fuse is
required to meet safety agency Conditions of Acceptability. The input
line fuse should be placed in series with the +In port. For agency
approvals and fusing conditions, click on the link below:
http://www.vicorpower.com/technical_library/technical_documentation/quality_
and_certification/safety_approvals/
Input Impedance Recommendations
To take full advantage of the VTM’s capabilities, the impedance of the
source (input source plus the PC board impedance) must be low over a
range from DC to 5 MHz. The input of the VTM (factorized bus) should
be locally bypassed with a 8 µF low Q aluminum electrolytic capacitor.
Additional input capacitance may be added to improve transient
performance or compensate for high source impedance. The VTM has
extremely wide bandwidth so the source response to transients is usually
the limiting factor in overall output response of the VTM.
Application Notes
For VTM and VI BRICK application notes on soldering, board layout, and
system design please click on the link below:
http://www.vicorpower.com/technical_library/application_information/
Applications Assistance
Please contact Vicor Applications Engineering for assistance,
1-800-927-9474, or email at [email protected]
Input reflected ripple
measurement point
7 A[a]
Fuse
F1
C1
47 µF
Al electrolytic
+IN
C2
0.47 μF
ceramic
TM
VC
PC
14 V +
–
-IN
+
+OUT
-OUT
R3
10 mΩ
+OUT
C3
10 µF
VTM
Load
-OUT
–
Notes:
1. C3 should be placed close to the load
2. R3 may be ESR of C3 or a separate damping resistor.
[a]
See Input Fuse Recommendations section
Figure 10 — VI BRICK VTM test circuit
Voltage Transformation Module
VT048A096T025FP
vicorpower.com
Rev. 1.0
Page 7 of 11
APPLICATION NOTES (CONT.)
In figures below;
K = VTM transformation ratio
RO = VTM output resistance
Vf = PRM output (Factorized Bus Voltage)
VO = VTM output
VL = Desired load voltage
FPA ADAPTIVE LOOP
Vo = VL ± 1.0%
VC
PC
TM
IL
NC
PR
PRM-AL
+IN
VH
SC
SG
OS
NC
CD
ROS
RCD
+IN
Factorized
Bus (Vf)
-OUT
-IN
L
O
A
D
-OUT
TM
VC
PC
+OUT
Vin
+OUT
VL (Io•Ro)
Vf =
+
K
K
VTM
+OUT
-OUT
-IN
Figure 11 — The PRM controls the factorized bus voltage, Vf, in proportion to output current to compensate for the output resistance, Ro, of the VTM. The VTM
output voltage is typically within 1% of the desired load voltage (VL) over all line and load conditions.
FPA NON-ISOLATED REMOTE LOOP
Remote
Loop
Control
Vo = VL ± 0.4%
VC
PC
TM
IL
NC
PR
PRM-AL
+IN
VH
SC
SG
OS
NC
CD
Factorized
Power Bus
+OUT
+IN
+OUT
+S
-OUT
TM
VC
PC
VTM
+OUT
Vf = f (Vs)
Vin
-IN
-OUT
-IN
-OUT
–S
L
O
A
D
Figure 12 — An external error amplifier or Point-of-Load IC (POLIC) senses the load voltage and controls the PRM output – the Factorized Bus – as a function of
output current, compensating for the output resistance of the VTM and for distribution resistance.
Voltage Transformation Module
VT048A096T025FP
vicorpower.com
Rev. 1.0
Page 8 of 11
BEHAVIORAL MODELS
VI BRICK VTM LEVEL 1 DC BEHAVIORAL MODEL FOR 48 V TO 9.6 V, 25 A
ROUT
IOUT
+
+
8.9 mΩ
V•I
1/5 • Iout
VIN
IQ
64 mA
+
+
–
1/5 • Vin
VOUT
–
K
–
–
©
Figure 13 — This model characterizes the DC operation of the VI BRICK VTM, including the converter transfer function and its losses. The model enables estimates
or simulations of output voltage as a function of input voltage and output load, as well as total converter power dissipation or heat generation.
VI BRICK VTM LEVEL 2 TRANSIENT BEHAVIORAL MODEL FOR 48 V TO 9.6 V, 25 A
5.5 nH
+
8.9 mΩ
RCIN
R IN
1.3CmΩ
CIN
4.0 µF
IQ
64 mA
25 mΩ
V•I
1/5 • Iout
VIN
ROUT
IOUT
L IN = 5 nH
+
+
–
LOUT = 1.6 nH
R
RCCOUT
OUT
+
0.2 mΩ
1/5 • Vin
COUT
55 µF
VOUT
–
K
–
–
©
Figure 14 — This model characterizes the AC operation of the VI BRICK VTM including response to output load or input voltage transients or steady state
modulations. The model enables estimates or simulations of input and output voltages under transient conditions, including response to a stepped load
with or without external filtering elements.
Voltage Transformation Module
VT048A096T025FP
vicorpower.com
Rev. 1.0
Page 9 of 11
MECHANICAL DRAWINGS
Baseplate - Slotted Flange
Heat Sink (Transverse)
Figure 15 — Module outline
Recommended PCB Pattern
(Component side shown)
Figure 16 — PCB mounting specifications
Voltage Transformation Module
VT048A096T025FP
vicorpower.com
Rev. 1.0
Page 10 of 11
Warranty
Vicor products are guaranteed for two years from date of shipment against defects in material or workmanship when in
normal use and service. This warranty does not extend to products subjected to misuse, accident, or improper application
or maintenance. Vicor shall not be liable for collateral or consequential damage. This warranty is extended to the original
purchaser only.
EXCEPT FOR THE FOREGOING EXPRESS WARRANTY, VICOR MAKES NO WARRANTY, EXPRESS OR IMPLIED, INCLUDING,
BUT NOT LIMITED TO, THE WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Vicor will repair or replace defective products in accordance with its own best judgement. For service under this warranty,
the buyer must contact Vicor to obtain a Return Material Authorization (RMA) number and shipping instructions. Products
returned without prior authorization will be returned to the buyer. The buyer will pay all charges incurred in returning
the product to the factory. Vicor will pay all reshipment charges if the product was defective within the terms of this
warranty.
Information published by Vicor has been carefully checked and is believed to be accurate; however, no responsibility is
assumed for inaccuracies. Vicor reserves the right to make changes to any products without further notice to improve
reliability, function, or design. Vicor does not assume any liability arising out of the application or use of any product or
circuit; neither does it convey any license under its patent rights nor the rights of others. Vicor general policy does not
recommend the use of its components in life support applications wherein a failure or malfunction may directly threaten
life or injury. Per Vicor Terms and Conditions of Sale, the user of Vicor components in life support applications assumes
all risks of such use and indemnifies Vicor against all damages.
Vicor’s comprehensive line of power solutions includes high density AC-DC and
DC-DC modules and accessory components, fully configurable AC-DC and DC-DC
power supplies, and complete custom power systems.
Information furnished by Vicor is believed to be accurate and reliable. However, no responsibility is assumed by Vicor for
its use. Vicor components are not designed to be used in applications, such as life support systems, wherein a failure or
malfunction could result in injury or death. All sales are subject to Vicor’s Terms and Conditions of Sale, which are available
upon request.
Specifications are subject to change without notice.
Intellectual Property Notice
Vicor and its subsidiaries own Intellectual Property (including issued U.S. and Foreign Patents and pending patent
applications) relating to the products described in this data sheet. Interested parties should contact Vicor's Intellectual Property Department.
The products described on this data sheet are protected by the following U.S. Patents Numbers:
5,945,130; 6,403,009; 6,710,257; 6,911,848; 6,930,893; 6,934,166; 6,940,013; 6,969,909; 7,038,917;
7,145,186; 7,166,898; 7,187,263; 7,202,646; 7,361,844; D496,906; D505,114; D506,438; D509,472; and for
use under U.S. Pat. Nos. 6,975,098 and 6,984,965.
Vicor Corporation
25 Frontage Road
Andover, MA, USA 01810
Tel: 800-735-6200
Fax: 978-475-6715
email
Customer Service: [email protected]
Technical Support: [email protected]
Voltage Transformation Module
VT048A096T025FP
vicorpower.com
Rev. 1.0
3/08