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MP028F036M12AL
Application Information
Regulator
Current Multiplier
V F =
0.01 μ F
10 k Ω
VC
PC
TM
IL
NC
PR
PRM ? -AL
+In +Out
VH
SC
SG
OS
NC
CD
R OS
R CD
V L
K
0.4 μH
+
(I L ? Ro)
K
+In
TM
VC
PC
+Out
+Out
VTM ?
– Out
L
O
A
V IN
–In
–Out
10 Ω
– In
K
Ro
– Out
D
Figure 18 — Adaptive Loop compensation with output voltage trimming and soft start using the SC port.
Output Voltage Setting with Adaptive Loop
The equations for calculating R OS and R CD to set a VTM output
voltage are:
Output Voltage Trimming (optional)
After setting the output voltage from the procedure above the output
may be margined down (26 Vf min) by a resistor from SC-SG using this
formula:
R OS =
93100
( V L ? 0.8395 ) – 1
K
(1)
R d Ω =
10000 V fd
V fs - V fd
Where V fd is the desired factorized bus and V fs is the set factorized bus.
R CD =
91238
+1
(2)
A low voltage source can be applied to the SC port to margin the load
R OS
V L = Desired load voltage
V OUT = VTM output voltage
K = VTM transformation ratio
(available from appropriate VTM data sheet)
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.
0.8 ?
1.1 ?
1.6 ?
2.2 ?
3.3 ?
4.3 ?
6.5 ?
8.7 ?
13.0 ?
17.4 ?
26.0 ?
V f = PRM output voltage, the Factorized Bus (see Figure 16)
R O = VTM output resistance
(available from appropriate VTM data sheet)
I L = Load Current
(actual current delivered to the load)
Nominal Vout
Range (Vdc)
1.6
2.2
3.3
4.4
6.6
8.8
13.4
17.9
26.9
36.0
54.0
VTM
K Factor
1/32
1/24
1/16
1/12
1/8
1/6
1/4
1/3
1/2
2/3
1
Table 1 — 048 input series VTM K factor selection guide
PRM ? Regulator 28 Vdc Input
Page 9 of 14
Rev 3.5
1/2013
vicorpower.com
800 735.6200
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