Operation description - boost section

LED7706

18/31

Equation 6

Equation 7

Note:

The lower the inductor value (and the lower the switching frequency), the higher the

bandwidth can be achieved. The output capacitor is directly involved in the loop of the boost

converter and must be large enough to avoid excessive output voltage drop in case of a

exceed 50-100 mV):

Equation 8

Once the output capacitor has been chosen, the

Equation 9

place the frequency of the compensation zero 5 times lower than the loop bandwidth:

Equation 10

Equation 11

trimmer and adjust its value to properly damp the output transient response. Insufficient

SW

U

F

2

.

0

f

⋅

≤

L

2

I

V

V

V

2

.

0

L

2

R

M

2

.

0

f

OUT

OUT

2

OUT

min

,

IN

2

U

⋅

π

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

⋅

=

⋅

π

⋅

≤

⎟

⎟

⎠

⎞

⎜

⎜

⎝

⎛

−

⋅

⋅

π

=

∆

MAX

_

IN

MIN

_

IN

U

OUT

OUT

V

V

1

C

f

2

I

V

M

g

G

C

f

2

R

EA

M

U

COMP

⋅

⋅

⋅

⋅

π

=

COMP

Z

COMP

R

f

2

1

C

⋅

⋅

π

=

sRC

1

R

M

L

s

1

RM

sC

1

R

g

G

G

2

COMP

COMP

EA

M

LOOP

+

−

⋅

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

+

⋅

⋅

=