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SCY99080CDWR2G bảng dữ liệu(PDF) 17 Page - ON Semiconductor

tên linh kiện SCY99080CDWR2G
Giải thích chi tiết về linh kiện  High Performance Switch-Mode Power Supply Controller for Backlight and LLC Converters
PDF  27 Pages
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nhà sản xuất  ONSEMI [ON Semiconductor]
Trang chủ  http://www.onsemi.com
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17
Fmin
Fmax
5.1
6
Frequency
decreases
No
variations
FB fault
detection
Outputs
disabled
1.2
Figure 36. VCO Transfer Characteristic
VFB (V)
Operating
Frequency
The output frequency remains at Fmin and the duty cycle
is at its maximum value (50% − deadtime) when the FB pin
voltage ranges between 5.1 and 6 V. The frequency of the
converter varies between Fmin and Fmax values if the
feedback voltage changes from 5.1 to 1.2 V. If the feedback
voltage further decreases, the operating frequency stays
constant and is given by the R_fmax resistor value. The IC
disables all drivers once the feedback voltage goes below
1.2 V threshold − skip mode. Please refer also to typical
VCO operating waveforms in Figure 37.
V_FB
6V
5.1V
1.2V
C_DT
DT
A
B
C_Dgs
SR_A
SR_B
Variable Fop
DT=50%
Fixed
Fop=Fmin
DT=50%
Fop = Fmax
Ct_T_On
FB_Fault
Figure 37. VCO Operating Waveforms
FB_Fault
detected
Operation
Mode



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