Microchip Technology MIC2128, Руководство пользователя

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Installation and Operation

2016 Microchip Technology Inc. DS50002533A-page 17
2.3.6 Setting the Soft-Start Time
The output soft-start time can be set by connecting a capacitor from SS to AGND as
shown in
Figure 2-3 .
FIGURE 2-3: Setting the Soft-Start Time.
The value of the capacitor can be calculated using the following equation:
EQUATION 2-5: EQUATION 5
where:
C
19
= Capacitor from SS pin to AGND
I
SS
= Internal soft-start current (1.3
µA
typical)
t
SS
= Output soft-start time
V
REF
= Reference voltage (0.6V)
MIC2128
g
m
0.6V
V
REF
Comparator
COMPENSATION
13
12
C
SS
I
SS
1.3 uA
FB
SS
C
19
I
SS
t
SS

V
REF
-------------------- =