EL7563C View Datasheet(PDF) - Elantec -> Intersil
Part Name
Description
MFG CO.
'EL7563C' PDF : 18 Pages View PDF
EL7563C
Monolithic 4 Amp DC:DC Step-down Regulator
2. Offset Tracking
The intended start-up sequence is shown in Figure 3a. In
this configuration, VC will not start until VP reaches a
preset value of:
-R---A---R--+--B---R----B- × VIN
However, due to the superimpose of VC and VIN, the
choice of RA and RB are restricted by the following
relationship:
VP + 0.5 < -R---A---R--+--B---R----B- × VIN + -R---A---R--+--A---R----B- × VC
Where 0.5 is for noise immunity. See Figure 3 below.
RB
1
20
2
19
6
15
VIN
7
EL7563C
14
RA
8
13
9 STP
+
12
10 STN -
11
1
20
2
19
6
15
7
EL7563C
14
8
13
9 STP
+
12
10 STN -
11
VC
VP
VOUT
VC
TIME
VP
Figure 3. Offset Power Tracking
12
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