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參數(shù)資料
| 型號(hào)： | 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)： | 26/40頁 |
| 文件大?。?/td> | 311K |
| 代理商： | AN-30 |
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AN-30
26
B
12/02
Figure B2. Circuit to Adjust Main Regulated Output Voltage to Higher Value.
V
V
I
R
R
D
N
N
R
R
R
D
IN
BZL
L
D
C
IL
B
P
AB
D
C
IL
=
+
+
+
+
1
mode noise. Monitor the current in the DRAIN pin of
TOPSwitch-GX
with a current probe and an oscilloscope.
Connect an adjustable low voltage DC power supply to the
feedback circuit as shown in Figure B2.
2. Set the oscilloscope to read the duty ratio from the waveform
of the
TOPSwitch-GX
drain current. Most digital
oscilloscopes will provide a direct readout of the numerical
value.
3. Adjust the low voltage DC power supply to 15 V.
4. Operate the converter at full load. Adjust V
to the value
that corresponds to the duty ratio limit specified in the data
sheet for a device at the low end of the tolerance range. The
DC input voltage for these conditions is given by
(B1)
where D
is the minimum DC
at the I
of 190
μ
A, and
the other terms are as they are defined in the text and
Appendix A
.
5. Adjust the duty ratio to D
by forcing the main output to
regulate at a higher voltage. To do this, reduce the voltage
of the bench power supply from 15 V until the duty ratio
measured from the drain current is D
IL
.
6. Verify that the current into the L pin is within 5% of I
L
. The
voltmeter should read 19 mV when I
L
is 190
μ
A.
If it is not possible to adjust the circuit to meet these conditions,
the circuit is not guaranteed to operate properly with all devices
in the specified range of tolerance. Repeat the design with
revised parameters.
Added Network to Adjust
Regulated Output
TL431
RTN
OPTO
1N4148
3.3 k
3.3 k
0 VDC to +15 VDC
Adjustable Power Supply
V
MAIN
+
_
Start with the adjustable power supply at 15 V. By lowering the
output of the external supply a threshold will be reached where the
diode will become forward biased. Lowering the adjustable supply
further will force the main output to a higher regulation voltage.
Main Output Regulator
PI-2846-041502
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