mp6001dn MPS, mp6001dn Datasheet - Page 10

• Manufacturer Part Number: mp6001dn
• Description: Monolithic Flyback/forward Dc-dc Converter
• Manufacturer: MPS

Duty Cycle Range
The duty cycle range is determined once N is
selected. In general, the optimum operating
duty cycle should be smaller for high input/low
output than low input/high output applications.
Except for high output voltage or wide input
range applications, the maximum D usually
does not exceed 60%.
Voltage Stress of the Internal Power Switch
& External Schottky Diode
For the internal power switch, the voltage stress
is given by:
Where V
inductrance), f
refer to Figure 4. The lower the L
lower the Vp. Smaller R can reduce Vp, but
power loss will increase. See Snubber Design
for details.
Typically V
(V
V
For the rectifier, D2, the voltage stress is given
by:
Use of a R-C or R-C-D type snubber circuit for
D2 is recommended.
MP6001 Rev. 0.91
9/21/2007
DS
C1
IN
+NV
Figure 4—Key Operation Waveform
V
O
C
).
--
+
P
P
C
V
TM
is a function of L
DS
can be selected as 20~40% of
S
V
, R, C, C
D
R
S
2
=
L
LK
D
=
V
V
C
V
IN
O
+
--
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
I
V
+
T
S
+
DS
r
V
V
DS
N
IN
O
, V
×
V
+
IN
N
V
IN
PD
+
D2
, I
MP6001 – MONOLITHIC FLYBACK/FORWARD DC-DC CONVERTER
2
V
V
O
I
LK
P
D2
P
, etc. Please
LK
and Io, the
MP6001_F04
© 2007 MPS. All Rights Reserved.
(leakage
C2
www.MonolithicPower.com
0
(V
Where K
Where K
For example,
the power switch rating should be higher than
144V,
synchronous rectifier or Schottky diode should
be higher than 23V.
Snubber Design (Passive)
Snubber for Power Switch
Figure 5 shows four different ways to clamp the
voltage on the power device. RCD type of
snubber circuit is widely used in many
applications.
V
V
V
V
IN
DS
D
PD
O
2
(
+V
MAX
2
=
C
=
D
1
(C)
. 1
(A)
IN
)
6 .
can
S
25
/N), thus:
=
V
S
D2
×
and
V
75
Figure 5—Snubber Designs
=1.2~1.4, and
DS
×
5 (
D
=1.4~2.
S
R
( 2
, V
(
D
(
75
V
MAX
MAX
be
N
+
V
the
R
C
=
75
)
)
D
D
+
8
=
=
V
selected
K ,
8
K
K
×
÷
S
s
D
5
rated
) 8
=
2
×
V
. 1
⋅
(
)
=
(
V
=
25
V
23
IN
144
0
K ,
(
V
(B)
(D)
MAX
+
S
as
voltage
D
V
2
V
)
MP6001_F05
IN
=
D
S
+
(
N
. 1
Z
40~100%
MAX
NV
, 6
V
)
0
D
O
)
)
Z
for
=
5
V
the
So
10
of