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參數資料
型號: MC33262P
廠商: MOTOROLA INC
元件分類: 穩壓器
英文描述: POWER FACTOR CONTROLLERS
中文描述: 0.5 A POWER FACTOR CONTROLLER, PDIP8
封裝: PLASTIC, DIP-8
文件頁數: 14/16頁
文件大小: 391K
代理商: MC33262P
MC34262 MC33262
14
MOTOROLA ANALOG IC DEVICE DATA
Figure 25. Error Amp Compensation
2
C1
Error Amp
+
10
μ
A
R1
1
6
R2
The Error Amp output is a high impedance node and is susceptible to noise pickup. To minimize pickup, compensation capacitor C1 must be
connected as close to Pin 2 as possible with a short, heavy ground returning directly to Pin 6. When operating at high ac line, the voltage at Pin 2
may approach the lower threshold of the Multiplier,
2.0 V. If there is excessive ripple on Pin 2, the Multiplier will be driven into cut–off causing
circuit instability, high distortion and poor power factor. This problem can be eliminated by increasing the value of C1.
Figure 26. Current Waveform Spike Suppression
10pF
22k
Current
Sense
Comparator
R7
4
7
C
R
A narrow turn–on spike is usually present on the leading edge of the current
waveform and can cause circuit instability. The MC34262 provides an
internal RC filter with a time constant of 220 ns. An additional external RC
filter may be required in universal input applications that are above 200 W. It
is suggested that the external filter be placed directly at the Current Sense
Input and have a time constant that approximates the spike duration.
Figure 27. Negative Current Waveform
Spike Suppression
10pF
22k
Current
Sense
Comparator
R7
4
7
D1
A negative turn–off spike can be observed on the trailing edge of the current
waveform. This spike is due to the parasitic inductance of resistor R7, and if it
is excessive, it can cause circuit instability. The addition of Shottky diode D1
can effectively clamp the negative spike. The addition of the external RC filter
shown in Figure 26 may provide sufficient spike attenuation.
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