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TS4975 bảng dữ liệu(PDF) 26 Page - STMicroelectronics

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TS4975 bảng dữ liệu(HTML) 26 Page - STMicroelectronics

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Application Information
TS4975
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4.6
Notes on PSRR measurement
What is PSRR?
The PSRR is the Power Supply Rejection Ratio. The PSRR of a device is the ratio between a
power supply disturbance and the result on the output. In other words, the PSRR is the ability of
a device to minimize the impact of power supply disturbance to the output.
How we measure the PSRR?
The PSRR was measured according to the schematic shown in Figure 61.
Figure 61. PSRR measurement schematic
Principles of operation
●
The DC voltage supply (Vcc) is fixed
●
The AC sinusoidal ripple voltage (Vripple) is fixed
●
No bypasss capacitor Cs is used
The PSRR value for each frequency is calculated as:
RMS is a rms selective measurement.
PSRR
20Log
RMS
Output
()
RMS
Vripple
()
---------------------------------- dB
()
=



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