Application Hints

STV9302A

6/15

4.1.1.1 Centering

4.1.1.2 Peak Current

From equation of peak current:

Finally, the bias voltage on pin 7 should be:

4.1.2

Ripple Rejection

When both ramp signal and bias are provided by the same driver IC, you can gain natural rejection

same fraction of ripple voltage to both booster inputs. For that purpose, arrange an intermediate

Figure 5: Ripple Rejection

V

7

V

M

V

m

+

2

------------------------

R

2

R

2

R

3

+

----------------------

ÿþ

×

=

I

P

V

M

V

m

–

()

2

-----------------------------

R

2

R

1

xR

3

-------------------

×

=

R

2

R

3

-------

2I

P

R

1

×

×

V

M

V

m

–

-----------------------------

2

3

---

=

=

V

7

V

M

V

m

+

2

------------------------

1

1

R

3

R

2

-------

+

-----------------

×

7

2

---

1

2.5

--------

×

1.4V

=

=

=

Rd

Yoke

Ly

Power

Amplifier

Flyback

Generator

Thermal

Safety

7

32

5

6

1

4

+

-

Reference

Voltage

Ramp

Signal

Driver

Ground

Source of Ripple