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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)計方法 |
| 文件頁數(shù)： | 25/40頁 |
| 文件大小： | 311K |
| 代理商： | AN-30 |
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AN-30
25
B
12/02
Appendix B
Procedure for Verifying Duty Ratio
Reduction Circuit
Predictions from analytic expressions are only as accurate as
their inputs. It is always advisable to confirm the desired
operation of circuits with actual hardware before they are
released to production. Reduction of the maximum duty ratio
of
TOPSwitch-GX
is particularly important in the forward
converter application. Therefore, users are strongly advised to
follow this simple procedure to confirm the correct operation of
the circuit to reduce the maximum duty ratio.
Add the circuits and instrumentation as shown in Figures B1
and B2 to the forward converter under evaluation as described
in the steps below. This setup allows independent adjustment
of the input voltage and the regulated main output voltage while
monitoring the current into the L pin.
1. Connect the AC input section in the non-doubling
configuration. Add enough extra bulk capacitance in parallel
with C
to make the ripple voltage negligible. Alternatively,
the converter may be operated from a high voltage DC
power supply instead of from the AC source. Insert the
parallel combination of a 100
resistor and a 0.1
μ
F
capacitor in series with the L pin. Monitor the voltage across
the resistor with a digital voltmeter. Place a 1 k
resistor in
each lead of the voltmeter to avoid interference from common
Figure B1. Setup to Measure Current into LINE-SENSE (L) Pin.
L pin Current Monitor Circuit
(190
μ
A is 19 mV)
Digital Voltmeter
1 k
100
To On/Off
Circuit
Monitor Drain Current with
Oscilloscope to Determine
Duty Ratio
0.1
μ
F 50 V
1 k
Added
Bulk
Cap
1800
μ
F
400 V
R
C
N
P
N
B
R
D
V
Z
C
VS
R
B
C
CP
V
IN
D
L
S
X
F
C
CONTROL
PI-2845-112102
U1
TOP247Y
RTN
To PWM
Regulator
Circuit
R
A
C
IN
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