VTM
VTM
TM
Current Multiplier
• 48 V to 4 V V•I Chip
TM
Converter
• 50 A (75.0 A for 1 ms)
• High density – 169 A/in
3
• Small footprint – 40 A/in
2
• Low weight – 0.5 oz (15 g)
• Pick & Place / SMD
or Through hole
• 125°C operation (T
J
)
• 1 µs transient response
• 3.5 million hours MTBF
• Typical efficiency 94%
• No output filtering required
V048F040T050
V048F040M050
©
Vf = 26 - 55 V
V
OUT
= 2.17 - 4.58 V
I
OUT
= 50 A
K = 1/12
R
OUT
= 3.6 m
Ω
max
Product Description
The V048F040T050 V•I Chip Voltage Transformation
Module excels at speed, density and efficiency to meet
the demands of advanced power applications while
providing isolation from input to output. It achieves a
response time of less than 1 µs and delivers up to 50 A in
a volume of less than 0.295 in
3
with unprecedented
efficiency. It may be paralleled to deliver higher power
levels at an output voltage settable from 2.17 to 4.58 Vdc.
The VTM V048F040T050’s nominal output voltage is 4
Vdc from a 48 Vdc input Factorized Bus, Vf, and is
controllable from 2.17 to 4.58 Vdc at no load, and from
1.99 to 4.42 Vdc at full load, over a Vf input range of 26
to 55 Vdc. It can be operated either open- or closed-loop
depending on the output regulation needs of the
application. Operating open-loop, the output voltage
tracks its Vf input voltage with a transformation ratio,
K = 1/12, for applications requiring an isolated output
voltage with high efficiency. Closing the loop back to an
input PRM
TM
regulator or DC-DC converter enables tight
load regulation.
The 4 V VTM achieves a current density of 169 A/in
3
in
a V•I Chip package compatible with standard pick-and-
place and surface mount assembly processes. The VTM’s
fast dynamic response and low noise eliminate the
need for bulk capacitance at the load, substantially
increasing system density while improving reliability
and decreasing cost.
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
Case temperature
Operating junction temperature
Storage temperature
Note:
(1) The referenced junction is defined as the semiconductor having the highest temperature.
This temperature is monitored by a shutdown comparator.
(1)
Values
-1.0 to 60
100
-0.3 to 7.0
-0.3 to 19.0
-0.5 to 12
2,250
50
75.0
221
332
225
-40 to 125
-55 to 125
-40 to 125
-65 to 125
Unit
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
A
A
W
W
°C
°C
°C
°C
°C
Notes
For 100 ms
Input to output
Continuous
For 1 ms
Continuous
For 1 ms
During reflow MSL 5
T-Grade
M-Grade
T-Grade
M-Grade
Part Numbering
V
Voltage
Transformation
Module
048
Input Voltage
Designator
F
040
Output Voltage
Designator
(=V
OUT
x10)
T
050
Output Current
Designator
(=I
OUT
)
Configuration
F = J-lead
T = Through hole
Product Grade Temperatures (°C)
Grade
Storage Operating (T
J
)
T
-40 to125 -40 to125
M
-65 to125 -55 to125
vicorpower.com
800-735-6200
V•I Chip Voltage Transformation Module
V048F040T050
Rev. 2.7
Page 1 of 11
Electrical Specifications
Input Specs
(Conditions are at 48 Vin, full load, and 25°C ambient unless otherwise specified)
Parameter
Input voltage range
Input dV/dt
Input overvoltage turn-on
Input overvoltage turn-off
Input current
Input reflected ripple current
No load power dissipation
Internal input capacitance
Internal input inductance
114
3.9
1.9
5
4.8
55.0
59.0
4.6
V•I Chip Voltage Transformation Module
Min
26
Typ
48
Max
55
1
Unit
Vdc
V/µs
Vdc
Vdc
Adc
mA p-p
W
µF
nH
Note
Max Vin = 53 V, operating from -55°C to -40°C
Using test circuit in Figure 15; See Figure 1
Output Specs
(Conditions are at 48 Vin, full load, and 25°C ambient unless otherwise specified)
Parameter
Output voltage
Rated DC current
Peak repetitive current
Short circuit protection set point
Current share accuracy
Efficiency
Half load
Full load
Internal output inductance
Internal output capacitance
Output overvoltage setpoint
Output ripple voltage
No external bypass
47 µF bypass capacitor
Effective switching frequency
Line regulation
K
Load regulation
R
OUT
Transient response
Voltage overshoot
Response time
Recovery time
52.5
5
93.8
93.5
94.8
94.5
1.1
255
4.6
216
2.40
0.0825
8
2.55
1/12
2.8
110
200
1
305
2.70
0.0842
3.6
mΩ
mV
ns
µs
10
Min
2.17
1.99
0
Typ
Max
4.58
4.42
50
75.0
Unit
Vdc
Vdc
Adc
A
Adc
%
%
%
nH
µF
Vdc
mVp-p
mVp-p
MHz
Note
No load
Full load
26 - 55 V
IN
Max pulse width 1ms, max duty cycle 10%,
baseline power 50%
Module will shut down
See Parallel Operation on Page 9
See Figure 3
See Figure 3
Effective value
Module will shut down
See Figures 2 and 5
See Figure 6
Fixed, 1.3 MHz per phase
V
OUT
= K•V
IN
at no load
See Figure 16
50 A load step with 100 µF C
IN
; See Figures 7 and 8
See Figures 7 and 8
See Figures 7 and 8
vicorpower.com
800-735-6200
V•I Chip Voltage Transformation Module
V048F040T050
Rev. 2.7
Page 2 of 11
Electrical Specifications
(continued)
Waveforms
Ripple vs. Output Current
220
Output Ripple (mVpk-pk)
200
180
160
140
120
100
80
0
5
10
15
20
25
30
35
40
45
50
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.
Efficiency vs. Output Current
96
14
Power Dissipation
Power Dissipation (W)
12
10
8
6
4
2
94
Efficiency (%)
92
90
88
86
84
82
0
5
10
15
20
25
30
35
40
45
50
0
5
10
15
20
25
30
35
40
45
50
Output Current (A)
Figure 3
— Efficiency vs. output current.
Output Current (A)
Figure 4
— Power dissipation vs. output current.
Figure 5
— Output voltage ripple at full load and 48 Vf with no POL bypass
capacitance.
Figure 6
— Output voltage ripple at full load and 48 Vf with 47 µF ceramic
POL bypass capacitance and 20 nH distribution inductance.
vicorpower.com
800-735-6200
V•I Chip Voltage Transformation Module
V048F040T050
Rev. 2.7
Page 3 of 11
Electrical Specifications
(continued)
V•I Chip Voltage Transformation Module
Figure 7
— 0-50 A load step with 100 µF input capacitance and no output
capacitance.
Figure 8
— 50-0 A load step with 100 µF input capacitance and no output
capacitance.
General
Parameter
MTBF
MIL-HDBK-217F
Isolation specifications
Voltage
Capacitance
Resistance
Agency approvals
Mechanical
Weight
Dimensions
Length
Width
Height
Peak compressive force applied to case (Z axis)
Thermal
Over temperature shutdown
Thermal capacity
Junction-to-case thermal impedance (R
θJC
)
Junction-to-board thermal impedance (R
θJB
)
Min
Typ
3.5
Max
Unit
Mhrs
Vdc
pF
MΩ
Note
25°C, GB
Input to output
Input to output
Input to output
UL /CSA 60950-1, EN 60950-1
Low voltage directive
See Mechanical Drawings, Figures 10 – 13
2,250
3,000
10
cTÜVus
CE Mark
RoHS
0.53/15
1.28/ 32,5
0.87 / 22
0.265/ 6,73
5
125
130
9.3
1.1
2.1
oz /g
in / mm
in / mm
in / mm
lbs.
°C
Ws /°C
°C / W
°C / W
6
135
Supported by J-leads only
Junction temperature
Auxiliary Pins
(Conditions are at 48 Vin, full load, and 25°C ambient unless otherwise specified)
Parameter
Primary Control (PC)
DC voltage
Module disable voltage
Module enable voltage
Current limit
Disable delay time
VTM Control (VC)
External boost voltage
External boost duration
4.8
2.4
2.4
5.0
2.5
2.5
2.5
30
14
10
5.2
2.6
2.9
Vdc
Vdc
Vdc
mA
µs
Vdc
ms
Min
Typ
Max
Unit
Note
VC voltage must be applied when module is enabled using PC
Source only
PC low to Vout low
Required for VTM start up without PRM
Vin > 26 Vdc. VC must be applied continuously
if Vin < 26 Vdc.
12
19
vicorpower.com
800-735-6200
V•I Chip Voltage Transformation Module
V048F040T050
Rev. 2.7
Page 4 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 26 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 26 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
-Out
4
A
3
2
1
A
B
C
D
E
+Out
B
C
D
E
+In
-Out
F
G
H
H
J
J
K
K
TM
VC
PC
+Out
L
M
N
P
R
T
L
M
N
P
R
T
-In
VC – VTM Control
The VC port is multiplexed. It receives the initial V
CC
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.
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 26 V
and for 10 ms after the input voltage has reached or exceeded 26 V. The
VTM is not designed for extended operation below 26 V. The VC port
should only be used to provide V
CC
voltage to the VTM during startup.
PC – Primary Control
Figure 9
— VTM pin configuration
Bottom View
Signal Name
+In
–In
TM
VC
PC
+Out
–Out
Pin Designation
A1-E1, A2-E2
L1-T1, L2-T2
H1, H2
J1, J2
K1, K2
A3-D3, A4-D4,
J3-M3, J4-M4
E3-H3, E4-H4,
N3-T3, N4-T4
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 16 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.
vicorpower.com
800-735-6200
V•I Chip Voltage Transformation Module
V048F040T050
Rev. 2.7
Page 5 of 11
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