el7564 Intersil Corporation, el7564 Datasheet - Page 14

• Manufacturer Part Number: el7564
• Description: Monolithic 4 Amp Dc/dc Step-down Regulator
• Manufacturer: Intersil Corporation

The second way of offset tracking is to use the EN and
Power Good pins, as shown in Figure 24. In this
configuration, V
P
does not have to be larger than V
10
10
1
2
3
5
6
7
8
9
1
2
3
5
6
7
8
9
14
EL7564
EL7564
EN
PG
EN
PG
V
IN
20
19
18
16
15
14
13
12
11
20
19
18
16
15
14
13
12
11
R
C
FIGURE 27. EXTERNAL SOFT START
FIGURE 26. OFFSET TRACKING
C
10
1
2
6
7
8
9
.
STN
STP
EL7564
+
-
EL7564
V
V
C
P
20
19
15
14
13
12
11
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:
t
s
=
R
u
C
u
---------
V
V
IN
O
V
TIME
OUT
V
V
P
C
May 9, 2005
FN7297.3