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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(shè)計(jì)方法 |
| 文件頁數(shù)： | 18/40頁 |
| 文件大?。?/td> | 311K |
| 代理商： | AN-30 |
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AN-30
18
B
12/02
(64)
(65)
(66)
If V
and V
ACUVX
are not satisfactory, adjust the values of
the resistors.
Step 17. Choose components for the clamp circuit.
Figure 10 shows connections for the elements of a Zener clamp
circuit that is suitable for many applications. Capacitor C
,
diode D1 and the string of Zener diodes are on the primary side
of the transformer. Resistor R
and capacitor C
CS
are on the
secondary side of the transformer.
This arrangement limits the voltage on the drain of the
TOPSwitch-GX
to approximately the sum of the voltages of the
string of Zener diodes. It also recovers most of the energy from
leakage inductance and magnetization inductance, and returns
it to the input or delivers it to the output.
Select the Zener diodes to limit the drain voltage to V
.
Choose the voltage, size and number of diodes in the string to
achieve the desired V
and to handle the power dissipation.
This arrangement is adequate for applications where the clamp
circuit dissipates less than 5 W.
Capacitor C
supplements the natural stray capacitance on the
drain node to absorb energy that comes mostly from the leakage
inductance. The value must be selected empirically because it
is difficult to predict natural stray capacitance and leakage
inductance accurately enough to calculate a proper value.
Energy not absorbed by the capacitance will be dissipated in the
Zener string, so C
cannot be too small. If C
is too large, its
voltage will change too slowly to allow the transformer to reset
during transients. Typical values for C
CP
are in the neighborhood
of 2 nF.
Diode D1 must be a slow recovery type such as a 1N5407. The
recovery of D1 removes enough charge from C
to stabilize its
voltage and to discharge some of its stored energy into the
primary of the transformer. This energy returns to the input on
the next switching cycle.
PI-2826-121901
R5
R6
R7
R1
R3
R4
C2
R2
C1
RTN
V
MAIN
V
AUX
N
MAIN
N
P
U2
C
F
L
F
U1
TL431
Figure 11. General Configuration of Feedback Circuit for Forward Converter with TOPSwitch-GX.
V
v
R
R
R
R
N
N
UVL
UVB
UVC
UVB
UVA
B
P
=
+
+
1
1
V
V
P
f
t
C
ACUVL
UVL
2
O
L
C
DC
IN
=
+
η
2
1
2
V
v
R
R
ACUVX
UVA
UVC
=
+
1
2
1
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