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MC33262CDR2 Datasheet

  • MC33262CDR2

  • ON Semiconductor [Power Factor Controllers]

  • ONSEMI

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MC34262, MC33262
10mA
Error Amp
+
1
R
2
R
1
6
C
1
2
Figure 26. Error Amp Compensation
The Error Amp output is a high impedance node and is susceptible to noise pickup. To minimize pickup, compensation
capacitor C
1
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,
鈮?/div>
2.0 V. If there is
excessive ripple on Pin 2, the Multiplier will be driven into cut鈭抩ff causing circuit instability, high distortion and poor power
factor. This problem can be eliminated by increasing the value of C
1
.
7
7
22k
10pF
Current
Sense
Comparator
4
C
R
R
7
Current
Sense
Comparator
10pF
22k
4
D
1
R
7
Figure 27. Current Waveform Spike Suppression
A narrow turn鈭抩n 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 28. Negative Current Waveform
Spike Suppression
A negative turn鈭抩ff spike can be observed on the trailing edge of
the current waveform. This spike is due to the parasitic
inductance of resistor R
7
, and if it is excessive, it can cause
circuit instability. The addition of Schottky diode D
1
can
effectively clamp the negative spike. The addition of the external
RC filter shown in Figure 26 may provide sufficient spike
attenuation.
http://onsemi.com
15

MC33262CDR2 PDF文件相關(guān)型號(hào)

MC34262D,MC34262DG,MC34262DR2,MC34262DR2G

MC33262CDR2 產(chǎn)品屬性

  • 2,500

  • 集成電路 (IC)

  • PMIC - PFC（功率因數(shù)修正）

  • -

  • 臨界傳導(dǎo)（CRM）

  • -

  • 250µA

  • 12 V ~ 28 V

  • -40°C ~ 105°C

  • 表面貼裝

  • 8-SOIC（0.154"，3.90mm 寬）

  • 8-SOICN

  • 帶卷 (TR)

MC33262CDR2相關(guān)型號(hào)PDF文件下載

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