PI3749-00-EVAL1 Datasheet, PDF (22/26 Pages) Vicor Corporation – Cool-Power® ZVS Switching Regulators

PI3749-x0
MRGN: Margin Control
By default, output voltage margining is disabled, corresponding to B3 being cleared. In this case, the reference to the error amplifier is at its
nominal value of 1.700V. When margining is enabled, the reference can be modified in 85mV steps according to Table 7.
MRGN state
MRGN data
MRGN_ENA<3> MRGN<2..0> Margin active?
1
100
Yes
1
101
Yes
1
110
Yes
1
111
Yes
0
xxx
No (data ignored), default
1
000
Yes
1
001
Yes
1
010
Yes
1
011
Yes
Table 7 — Margin control register programming
Resultant Margin Function
Reference Voltage (V)
1.360
1.445
1.530
1.615
1.700
1.785
1.870
1.955
2.040
The MRGN state is always controlled by four bit wide volatile register. At power up, the register always resets to 4’b0000. The MRGN
address can be freely read and written, as there are no one-time programmable fuses involved.
Cool-Power^® ZVS Switching Regulators
Page 22 of 26
Rev 1.8
03/2017
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