EL7563CM 查看數據表（PDF） - Elantec -> Intersil

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EL7563CM

Monolithic 4 Amp DC:DC Step-down Regulator

Elantec -> Intersil 

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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