EL7564 データシートの表示（PDF） - Intersil
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EL7564 Datasheet PDF : 17 Pages
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EL7564
The second way of offset tracking is to use the EN and
Power Good pins, as shown in Figure 24. In this
configuration, VP does not have to be larger than VC.
3. External Soft Start
An external soft start can be combined with auxiliary supply
tracking to provide desired soft start other than internally
preset soft start (Figure 25). The appropriate start-up time is:
ts
=
R
×
C
×
-V-----O---
VIN
1
EN 20
2
19
3
PG 18
5
16
6 EL7564 15
VC
7
14
8
13
9
12
10
11
1
EN 20
2
19
3
PG 18
5
16
6 EL7564 15
7
14
8
13
9
12
10
11
VP
FIGURE 26. OFFSET TRACKING
VP
VC
TIME
VIN
R
C
1
20
2
19
6
15
7 EL7564 14
8
13
STP
9
+
12
10 STN -
11
VOUT
FIGURE 27. EXTERNAL SOFT START
14
FN7297.3
May 9, 2005
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