Datasheet

Pick
DV
SNUB
V
R
+ between 0.5 and 1
C
SNUB
+
I
cs(peak)
2
L
LEAK
ǒ
V
R
) DV
SNUB
Ǔ
2
* V
R
2
R
SNUB1
+ ǒ
1
2
)
V
R
DV
SNUB
Ǔ
1
C
SNUB
ǒ
1
f
S(max)
*
L
LEAK
I
CS(peak)
DV
SNUB
Ǔ
( )
2
2
SNUB
R
R
SNUB
SNUB1
SNUB1
V
1 1
V 1
V
1
2 3
V 2
P R
R
é ù
é ù
ê ú
ê ú
D
æ ö
æ ö
ê ú
ê ú
+ ´ + ´
ç ÷
ç ÷
ê ú
è ø
ê ú
è ø
+
ê ú
ê ú
ë û
ë û
=
R
SNUB2
+
DV
SNUB
I
CS(peak)
P
ǒ
R
SNUB
Ǔ
+ I
CS(peak)
2
R
SNUB2
ȧ
ȧ
ȧ
ȧ
ȡ
Ȣ
1
3
L
LEAK
f
S(max)
ǒ
V
R
)
DV
SNUB
2
Ǔ
ȧ
ȧ
ȧ
ȧ
ȣ
Ȥ
Q +
2V
R
DV
SNUB
) 1
Ǹ
UCC28600
www.ti.com SLUS646J –NOVEMBER 2005– REVISED JULY 2011
Begin the design of the R
2
CD using the same procedure as designing an RCD snubber. Then, add the damping
resistor, R
SNUB2
. The procedure is as follows:
(6)
Select a capacitor for ΔV
SNUB
:
(7)
Pick R
SNUB
to discharge C
SNUB
:
(8)
(9)
Pick R
SNUB2
to dampen the L
LEAK
-C
SNUB
resonance with a Q that is between 1.7 and 2.2:
(10)
(11)
For the original selection of ΔV
SNUB
,
(12)
Copyright © 2005–2011, Texas Instruments Incorporated 23