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參數(shù)資料
| 型號： | AN-30 |
| 英文描述： | TOPSwitch-GX Forward Design Methodology |
| 中文描述： | 的TOPSwitch - GX系列正向設計方法 |
| 文件頁數(shù)： | 16/40頁 |
| 文件大?。?/td> | 311K |
| 代理商： | AN-30 |
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AN-30
16
B
12/02
Figure 9. External Under-Voltage Lockout Circuit.
PI-2824-121701
TOPSwitch-GX
CONTROL Pin
TOPSwitch-GX
X Pin
TOPSwitch-GX
SOURCE Pin
Remote
ON/OFF
R
UVC
R
UVA
5 K
3.3 K
Q1 2N3906
V
IN
V
B
R
UVB
r
V
N
N
V
D
I
V
R
D
m
MAX
B
P
BZL
XHL
LD
MAX
AB
XHL
IL
2
0
≡
R
r
r
D
D
D
XDO
XHL
=
1
2
R
r
D
R
C
XDO
D
=
1
V
I
R
R
ACUV
UV
2
A
B
=
+
(
)
D
v
v
2
v v
v
MAX
B
B
A
=
+
+
2
4
v
R
m
A
D
IL
=
v
V
I
R
R
m
V
R
R
N
N
B
BZL
LD
D
C
IL
IN
D
AB
B
P
=
+
+
0
v
R
I
V
R
C
C
LD
IN
AB
=
0
D
D
m
I
I
XOV
IL
IL
OV
L
=
(
)
C
I
V
R
D
T
t
K
R
VS
OV
OV
AB
XOV
S
R ON
OVHYS OVHYS
D
=
(
)
(
)
)
1
(50)
where
(51)
(52)
(53)
Now choose an appropriate value for the capacitor. Proper
choice of the capacitor allows the converter to operate safely
with transient input voltages greater than V
.
The line
overvoltage feature of
TOPSwitch-GX
is not used in the
conventional fashion in this application. The circuit operates in
an over-voltage mode that reduces the maximum duty ratio
further by reduction of the switching frequency. The value of
the capacitor C
is chosen to give the desired behavior in the
over-voltage mode.
Select an input voltage V
greater than V
that marks the
onset of over-voltage operation. Then compute the maximum
duty ratio D
that corresponds to the specification in the
TOPSwitch-GX
data sheet for the Line Over-Voltage Threshold
Current I
OV
.
(54)
Here D
IL
, m
IL
and I
L
are the same as in Equations (36) and (37).
Finally, compute the capacitor value as
(55)
where
T
S
is the switching period 1/f
S
in normal operation
t
R(ON)
is the Remote ON Delay
I
OVHYS
is the hysteresis of the IOV threshold
K
OVHYS
is a constant selected by the designer.
The first three parameters are taken from the data sheet. The
constant K
OVHYS
is selected to provide sufficient ripple voltage
(46)
Compute the values for the resistors R
D
and R
C
.
(47)
(48)
Select the nearest standard resistor values for R
C
and R
D
.
Verify that the parameters are within the desired range with the
actual component values.
(49)
This is the AC input voltage (non-doubled) where the converter
will begin to operate.
The external duty ratio limit at any DC bus voltage V
IN
may be
computed from the expression
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