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V048F020T080 Datasheet(PDF) 9 Page - Vicor Corporation

Part # V048F020T080
Description  VI Chip - PRM-AL Pre-Regulator Module
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Manufacturer  VICOR [Vicor Corporation]
Direct Link  http://www.vicorpower.com
Logo VICOR - Vicor Corporation

V048F020T080 Datasheet(HTML) 9 Page - Vicor Corporation

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vicorpower.com
800-735-6200
V•I Chip Pre-Regulator Module
P048F048T12AL
Rev. 1.0
Page 9 of 14
PRELIMINARY
L
O
A
D
-In
PC
VC
TM
+In
-Out
+Out
VTM
+Out
-Out
K
Ro
+Out
–Out
+In
–In
VC
PC
TM
IL
VH
PR
NC
SG
SC
PRM-AL
OS
NC
CD
Factorized
Bus (Vf)
(IL•Ro)
K
Vf = V
L +
K
Vin
ROS
RCD
0.4
μH
Output Voltage Setting with Adaptive Loop
The equations for calculating ROS and RCD to set a VTM output
voltage are:
93100
ROS =
( V
L
• 0.8395 ) – 1
(1)
K
RCD =
91238
+ 1
(2)
ROS
VL = Desired load voltage
VOUT = VTM output voltage
K = VTM transformation ratio
(available from appropriate VTM data sheet)
Vf = PRM output voltage, the Factorized Bus (see Figure 16)
RO = VTM output resistance
(available from appropriate VTM data sheet)
IL = Load Current
(actual current delivered to the load)
Output Voltage Trimming (optional)
After setting the output voltage from the procedure above the output
may be margined down (26Vf min) by a resistor from SC-SG using this
formula:
RdΩ =
10000 Vfd
Vfs - Vfd
Where Vfd is the desired factorized bus and Vfs is the set factorized bus.
A low voltage source can be applied to the SC port to margin the load
voltage in proportion to the SC reference voltage.
An external capacitor can be added to the SC port as shown in Figure 16 to
control the output voltage slew rate for soft start.
Figure 16 — Adaptive Loop compensation with soft start using the SC port.
Nominal Vout
VTM
Range (Vdc)
K Factor
0.8 ↔
1.6
1/32
1.1 ↔
2.2
1/24
1.6 ↔
3.3
1/16
2.2 ↔
4.4
1/12
3.3 ↔
6.6
1/8
4.3 ↔
8.8
1/6
6.5 ↔
13.4
1/4
8.7 ↔
17.9
1/3
13.0 ↔
26.9
1/2
17.4 ↔
36.0
2/3
26.0 ↔
54.0
1
Table 2 — 048 input series VTM K factor selection guide
Application Information
V•I Chip Pre-Regulator Module


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