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NCP1237 bảng dữ liệu(PDF) 19 Page - ON Semiconductor

tên linh kiện NCP1237
Giải thích chi tiết về linh kiện  Fixed Frequency Current Mode Controller for Flyback Converters
PDF  34 Pages
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nhà sản xuất  ONSEMI [ON Semiconductor]
Trang chủ  http://www.onsemi.com
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NCP1237 bảng dữ liệu(HTML) 19 Page - ON Semiconductor

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NCP1237
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Figure 15. Overpower Compensation Current Relation to Feedback Voltage and Input Voltage
VFB
IOPC
VFB(fold)
VFB(OPC)
VHV
Feedback with Slope Compensation
The ratio from the FB voltage to the current sense setpoint
is typically 5. This means that the FB voltage corresponding
to VILIM is 3.5 V. There is a pullup resistor of 20 kW
(typical) from FB pin to the internal reference VFB(ref).
Figure 16. FB Circuitry
CS
FB
−
+
t LEB
blanking
VDD
Oscillator
20 kW
K FB
slope
comp.
PWM
In order to allow the NCP1237 to operate in CCM with a
duty cycle above 50%, a fixed slope compensation is
internally applied to the current−mode control. The slope
appearing on the internal voltage setpoint for the PWM
comparator is −32.5 mV/
ms typical for the 65 kHz version
(and respectively −50 mV/
ms and −67 mV/ms for the
100 kHz and 133 kHz versions).



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