Datasheet

Datasheet

22/34

TSZ02201-0F1F0C100240-1-2

© 2013 ROHM Co., Ltd. All rights reserved.

15.Feb.2016 Rev.006

www.rohm.com

TSZ22111・15・001

BD9486F

●3.4.Loop Compensation

converter. This zero may cause the unstable feedback. To avoid this by RHP zero, the loop compensation that the

Considering the response speed, the calculated constant below is not always optimized completely. It needs to be

adequately verified with an actual device.

Figure 31. Output stage and error amplifier diagram

i.

(Continuous Current Mode)

ii.

Above equation is described for lighting LED without the oscillation. The value may cause much error if the quick

response for the abrupt change of dimming signal is required.

adequately verified with an actual device in consideration of variation from parts to parts since phase margin is

decreased.

　　

　

]

Hz

[

I

L

)

D

(

V

f

LED

OUT

ZRHP













2

1

2

　

　

]

[

)

D

(

V

gm

f

I

R

f

R

OUT

p

LED

CS

RHZP

FB



















1

5

1

　

　

]

Hz

[

C

V

I

f

OUT

OUT

LED

p









2

　

OUT

IN

OUT

V

V

V

D





]

S

[

.

gm

4

10

0

4







]

F

[

ZRHP

f

1

FB

R

π

2

5

c

f

1

FB

R

π

2

1

1

FB

C











