EL7563 データシートの表示（PDF） - Intersil
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EL7563 Datasheet PDF : 16 Pages
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EL7563
Power Tracking
The power tracking pins STP and STN are the inputs to a
comparator, whose HI output forces the PWM controller to
skip switching cycle.
1. Linear Tracking
In this application, it is always the case that the lower voltage
supply VC tracks the higher output supply VP. See Figure 23.
2. Offset Tracking
The intended start-up sequence is shown in Figure 24. In
this configuration, VC will not start until VP reaches a preset
value of:
--------R----B---------
RA + RB
×
VI
N
1
20
2
19
6
15
VC
7 EL7563 14
8
13
9
+
12
-
10
11
VP
VOUT
VC
1
20
2
19
6
15
VP
7 EL7563 14
8
13
9
+
12
-
10
11
FIGURE 23. LINEAR POWER TRACKING
TIME
1
20
2
19
6
15
VC
VIN
7
EL7563 14
RA
8
13
9 STP +
12
RB
10 STN -
11
VP
VOUT
VC
1
2
6
7 EL7563
8
9 STP +
10 STN -
20
19
15
VP
14
13
12
11
FIGURE 24. OFFSET POWER TRACKING
TIME
12
FN7296.2
May 13, 2005
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