AN1606 APPLICATION NOTE

6/18

Fig 6b

Other control circuits

Input voltage sensing: in the standard boost topology the rectified input voltage waveform is sensed using a re-

sistor that, by one internal circuit, delivers the mirrored signal to one of the multiplier's inputs (Iac-pin4).

For the bridgeless configuration see the circuit shown in fig.7.

L2

L

O

A

D

R

s

v

s

L1a

L1b

controller

M

1

M

2

Q1

D

1

D

2

Da

Db

Dc

Φ

i

in

Inductor

L1a

L1b

L1=L1a+L1b

L2

L1

TOT

Φ

v

s

v

s

s

Φ

Φ

M2_D2 Chopping Phase

L1a

L1b

L1=L1a+L1b

L2

L1

TOT

v

sa

v

sb

s

ΦΦ

Φ

M1_D1 Chopping Phase