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IXAN0069 Scheda tecnica(PDF) 9 Page - IXYS Corporation

Il numero della parte IXAN0069
Spiegazioni elettronici  DC to DC Synchronous Converter Design
PDF  11 Pages
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Produttore elettronici  IXYS [IXYS Corporation]
Homepage  http://www.ixys.com
Logo IXYS - IXYS Corporation

IXAN0069 Scheda tecnica(HTML) 9 Page - IXYS Corporation

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DC to DC Synchronous Converter Design
Abdus Sattar, IXYS Corporation
IXAN0068
9
Gate
DOWN
PULL
DRIVER
SP
DD
L
H
DRIVER
R
R
V
V
I
+
−
=
−
−
)
(
)
(
A
58
.
1
2
2
.
2
35
.
3
10
=
+
−
=
The rise time is,
nS
nS
nS
t
on
t
36
10
26
)
(
=
+
=
The fall time is,
nS
nS
ns
t
off
t
28
10
18
)
(
=
+
=
High-Side MOSFET loss (Q1=IXTA90N055T2):
The conduction loss is,
D
R
I
P
on
DS
O
Q
Cond
•
•
=
)
(
2
1
_
mW
332
332
.
0
275
.
0
0084
.
0
12
2
=
=
•
•
=
The Gate-Charge losses: (assume fs = 200 kHz)
mW
x
x
x
x
f
Q
V
P
s
g
GS
Q
GC
84
10
200
10
42
0
.
10
3
9
1
_
=
=
•
•
=
−
And estimated switching loss is,
Pt
2
]
}
{
[
)
(
)
(
)
(
)
(
(max)
s
off
t
off
DS
on
t
on
DS
DS
f
t
I
t
I
V
•
•
+
•
=
3
9
10
200
10
)
28
36
(
2
12
12
x
x
x
−
+
•
•
=
= 0.921W=921mW
Total high-side losses: 332mW+84mW+921mW = 1337mW=1.337W
Low-Side MOSFET loss (Q2):
The conduction loss is,
)
1
(
)
(
2
2
_
D
R
I
P
on
DS
O
Q
Cond
−
•
•
=
mW
W
877
877
.
0
725
.
0
0084
.
0
12
2
=
=
•
•
=
The Gate-Charge loss:
mW
x
x
x
x
f
Q
V
P
s
g
GS
Q
GC
84
10
200
10
42
0
.
10
3
9
1
_
=
=
•
•
=
−
Total low-side losses: 877mW+84mW =961mW
ISL6594D Driver loss:
From datasheet: VDD = 5V
Table 6: IXS839 Driver Output Stage from datasheet
Driver pull up resistance
RDRIVER(PULL_UP)
3.0 Ω
Driver pull down resistance
RDRIVER(PULL_DOWN)
2.2
Ω
Driver gate resistance
RGATE
2
Ω



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