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PDF VTM48EF015T115A00 Data sheet ( Hoja de datos )
| Número de pieza | VTM48EF015T115A00 | |
| Descripción | VTM Current Multiplier | |
| Fabricantes | Vicor | |
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VTM Current Multiplier
VTM48EF015T115A00
®S
C US C NRTL US
High Efficiency, Sine Amplitude Converter™
FEATURES
• 48 Vdc to 1.5 Vdc 115 A current multiplier
- Operating from standard 48 V or 24 V PRM™ regulators
• High efficiency (>94%) reduces system power
consumption
• High density (392 A/in3)
• “Full Chip” VI Chip® package enables surface mount,
low impedance interconnect to system board
• Contains built-in protection features against:
- Overvoltage
- Overcurrent
• Provides enable / disable control,
internal temperature monitoring
• ZVS / ZCS resonant Sine Amplitude Converter topology
• Less than 50 ºC temperature rise at full load
in typical applications
TYPICAL APPLICATIONS
• High End Computing Systems
• Automated Test Equipment
• High Density Power Supplies
• Communications Systems
TYPICAL APPLICATION
Voltage
Control
DESCRIPTION
The VI Chip® current multiplier is a high efficiency (>94%) Sine
Amplitude Converter™ (SAC™) operating from a 26 to 55 Vdc
primary bus to deliver an isolated output. The Sine Amplitude
Converter offers a low AC impedance beyond the bandwidth
of most downstream regulators; therefore capacitance normally
at the load can be located at the input to the Sine Amplitude
Converter. Since the K factor of the VTM48EF015T115A00 is
1/32, the capacitance value can be reduced by a factor of 1024,
resulting in savings of board area, materials and total system cost.
The VTM48EF015T115A00 is provided in a VI Chip® package
compatible with standard pick-and-place and surface mount
assembly processes. The co-molded VI Chip® package provides
enhanced thermal management due to a large thermal
interface area and superior thermal conductivity. The high
conversion efficiency of the VTM48EF015T115A00 increases
overall system efficiency and lowers operating costs compared
to conventional approaches.
The VTM48EF015T115A00 enables the utilization of Factorized
Power Architecture™ which provides efficiency and size
benefits by lowering conversion and distribution losses and
promoting high density point of load conversion.
VIN = 26 to 55 V
VOUT = 0.8 to 1.7 V(NO LOAD)
IOUT = 115 A (NOM)
K = 1/32
PART NUMBER
VTM48EF015T115A00
DESCRIPTION
-40°C to 125°C TJ
Feedback
Enable/
Disable
38 to 55
Vdc Input
PC
+IN
PR TM
+OUT
PRMTM
Regulator
-IN
IF RE
-OUT
SG VC
Constant
Vc
Voltage
Reference
Current
Sense
PC
+IN +OUT1
+OUT2
VTM48EF015T115A00
-IN -OUT1
VC -OUT2
PC
+IN +OUT1
VTM48EF015T115+AO0U0T2
-IN -OUT1
VC -OUT2
Load
VTM® Current Multiplier
Page 1 of 17
Rev 3.5
09/2015
vicorpower.com
800 927.9474
1 page  
VTM48EF015T115A00
5.0 APPLICATION CHARACTERISTICS
The following values, typical of an application environment, are collected at TC = 25 ºC unless otherwise noted. See associated
figures for general trend data.
ATTRIBUTE
No load power dissipation
Efficiency (ambient)
Efficiency (hot)
Output resistance (cold)
Output resistance (ambient)
Output resistance (hot)
Output voltage ripple
VOUT transient (positive)
VOUT transient (negative)
SYMBOL
PNL
hAMB
hHOT
ROUT_COLD
ROUT_AMB
ROUT_HOT
VOUT_PP
VOUT_TRAN+
VOUT_TRAN-
CONDITIONS / NOTES
VIN = 48 V, PC enabled
VIN = 48 V, IOUT = 115 A
VIN = 48 V, IOUT = 115 A, TC = 100 ºC
VIN = 48 V, IOUT = 115 A, TC = -40 ºC
VIN = 48 V, IOUT = 115 A
VIN = 48 V, IOUT = 115 A, TC = 100 ºC
COUT = 0 F, IOUT = 115 A, VIN = 48 V,
20 MHz BW, Section 12
IOUT_STEP = 0 A TO 115A, VIN = 48 V,
ISLEW = 36 A /us
IOUT_STEP = 115 A to 0 A, VIN = 48 V
ISLEW = 23 A /us
TYP UNIT
2.1 W
91.8 %
90.3 %
0.7 mΩ
0.9 mΩ
1.0 mΩ
116 mV
40 mV
60 mV
No Load Power Dissipation vs. Line Voltage
4.0
3.5
3.0
2.5
2.0
1.5
1.0
26
29 32
TCASE:
35 38 41 43 46
Input Voltage (V)
-40 °C
25 °C
49 52
100 °C
55
Figure 1 — No load power dissipation vs. VIN
Full Load Efficiency vs. TCASE
94
92
90
88
86
84
82
80
-40
-20
VIN :
0 20 40 60
Case Temperature (°C)
80
26 V
48 V
55 V
Figure 2 — Full load efficiency vs. temperature
100
Efficiency & Power Dissipation -40 °C Case
96 48
44
92
η
40
36
88 32
28
84 24
20
80
PD
16
12
76 8
4
72 0
0 13 26 39 52 65 78 91 104 117 130
Load Current (A)
VIN: 26 V
48 V
55 V
26 V
48 V
55 V
Figure 3 — Efficiency and power dissipation at –40°C
Efficiency & Power Dissipation 25 °C Case
96 48
44
92 40
η
88
36
32
28
84 24
20
80 PD
16
12
76 8
4
72 0
0 13 26 39 52 65 78 91 104 117 130
Load Current (A)
VIN: 26 V
48 V
55 V
26 V
48 V
55 V
Figure 4 — Efficiency and power dissipation at 25°C
VTM® Current Multiplier
Page 5 of 17
Rev 3.5
09/2015
vicorpower.com
800 927.9474
5 Page 
VTM48EF015T115A00
11.0 SINE AMPLITUDE CONVERTERTM POINT OF LOAD CONVERSION
LIN = 3.7 nH
+
VVININ CCININ
R6RC.C3ININmΩ
900 nF
IIQQ
46 mA
1/32 • IOUT
–
IOIOUUTT
90 pH
V•I
++
0.98 Ω
1/32 • VIN
––
K
RROOUUTT
0.84 mΩ
COCUOTUT
LOUT = 150 pH
RR5C0COµOUΩTUT
+
420 µF
VVOOUUTT
–
Figure 17 — VI Chip® product AC model
The Sine Amplitude Converter (SAC™) uses a high frequency
resonant tank to move energy from input to output. (The
resonant tank is formed by Cr and leakage inductance Lr in the
power transformer windings as shown in the VTM™ Module
Block Diagram. See Section 10). The resonant LC tank,
operated at high frequency, is amplitude modulated as a
function of input voltage and output current. A small amount
of capacitance embedded in the input and output stages of
the module is sufficient for full functionality and is key to
achieving power density.
The VTM48EF015T115A00 SAC can be simplified into the
following model:
At no load:
VOUT = VIN • K
K represents the “turns ratio” of the SAC.
Rearranging Eq (1):
(1)
ROUT represents the impedance of the SAC, and is a function of
the RDSON of the input and output MOSFETs and the winding
resistance of the power transformer. IQ represents the
quiescent current of the SAC control and gate drive circuitry.
The use of DC voltage transformation provides additional
interesting attributes. Assuming that ROUT = 0 Ω and IQ = 0 A,
Eq. (3) now becomes Eq. (1) and is essentially load
independent, resistor R is now placed in series with VIN as
shown in Figure 18.
VVIiNn
+
–
RR
KSS=AAC1C™/32
K = 1/32
VVoOUuTt
K = VOUT
VIN
In the presence of load, VOUT is represented by:
VOUT = VIN • K – IOUT • ROUT
and IOUT is represented by:
IOUT
=
IIN
–
K
IQ
(2) Figure 18 – K = 1/32 Sine Amplitude Converter with series
input resistor
The relationship between VIN and VOUT becomes:
VOUT = (VIN – IIN • R) • K
(3)
Substituting the simplified version of Eq. (4)
(IQ is assumed = 0 A) into Eq. (5) yields:
(5)
(4) VOUT = VIN • K – IOUT • R • K2
(6)
VTM® Current Multiplier
Page 11 of 17
Rev 3.5
09/2015
vicorpower.com
800 927.9474
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet VTM48EF015T115A00.PDF ] | |
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