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| 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)： | 32/40頁 |
| 文件大?。?/td> | 311K |
| 代理商： | AN-30 |
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AN-30
32
B
12/02
Optional Under-Voltage Lockout Circuit:
R
UVA
, R
UVB
, R
UVC
The external under-voltage lockout circuit is shown in Figure 9. The circuit sets the minimum input voltage that should be
present before the
TOPSwitch-GX
is enabled. The circuit also sets the voltage at which the converter is shut off during power
down.
Step (q). Selection of
R
UVA
R
UVB
&
R
UVC
:
Under worst-case input voltage conditions power dissipation in
R
UVA
must not exceed 150 mW. The spreadsheet calculates the
value of this resistor. In EP-12 this resistor is:
R
UVA
=
2.23
M
(RUVA, F126)
Choose closest standard value;
R
UVA
=
2.2
M
, 0.5 W
Choose
V
and
V
ACUV
and select
R
&
R
UVC
:
Choose a value for
V
ACUVL
and
V
ACUV
such that
V
ACUVL
<
V
ACUVX
<
V
ACUV
where
V
is the voltage at which the external under-voltage lockout circuit enables the
TOPSwitch-GX
during start-up. This
value is automatically calculated by the spreadsheet.
Set the voltage at which the converter shuts off with the external UVLO circuit,
V
ACUVL
= 67
V.
Enter the voltage at which the converter should begin its steady state operation
V
ACUV
= 80
V.
This means that the voltage at which the external UVLO circuit enables the
TOPSwitch-GX
while the input voltage is rising,
V
must lie within the limits 67
V <V
< 80
V.
The spreadsheet returns a value for voltages
V
ACUVX
and
V
ACUVL
. Check that these values are within acceptable limits.
The spreadsheet returns the following values for resistors
R
UVB
&
R
UVC
.
R
UVB
=
523.73
k
R
UVC
=
75.91
k
(RUVB, F127)
(RUVC, F128)
If the calculated value of the resistors is unavailable, use closest available standard values. Back calculate for
V
ACTUAL
and
V
ACUVX
and check that they are within acceptable limits.
For EP-12 the values of resistors are as follows
R
UVB
=
560
k
R
=
75
k
Back calculating to check for
V
ACUVL
and
V
ACUVX
we have
V
ACUVL
= 67.5
V
V
= 70.36
V
both within reasonable limits.
(VACUVL ACTUAL, F130)
(VACUVX ACTUAL, F131)
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