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SDC2921 bảng dữ liệu(PDF) 10 Page - Shaoxing Devechip Microelectronics Co., Ltd

tên linh kiện SDC2921
Giải thích chi tiết về linh kiện  Voltage Mode PWM Controller
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nhà sản xuất  SDC [Shaoxing Devechip Microelectronics Co., Ltd]
Trang chủ  http://www.sdc-semi.com/e/index.asp
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SDC2921 bảng dữ liệu(HTML) 10 Page - Shaoxing Devechip Microelectronics Co., Ltd

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Datasheet
December, 2013 Rev. 1.2
10/13
©
2013 Shaoxing Devechip Microelectronics Co., Ltd.
www.sdc-semi.com
Voltage Mode PWM Controller
SDC2921
Under Voltage Protection Delay Time
REM
REMON
UVP
tUVP
Figure 6. Delay Time
Pulse Width Modulation Block
The output pulse width modulation is generated by
comparison of the sawtooth waveform from the capacitor
CT to the feedback of the voltage. Therefore, an increase
in feedback control signal amplitude cause a linear
decrease of the output pulse width. Also, the SS(Soft-Start)
limits the output pulse width. The timing diagram is
shown as below:
PWM OUT
CT
DTC
FF-CLK
FF-Q
FF-QN
C1
C2
Figure 7. PWM Block
The function of PT
This signal is prepared for extra OVP/OPP (VPT > 1.25V) or disable under voltage protection function (VPT < 0.62V)
SDC
CONFIDENTIAL
DOCUMENT



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