PSRR Measurement for LDO
◆The unit is decibel (dB). For example, 60-dB PSRR means that when the input ripple is 1 V, the output ripple will be 1 mV.
◆There is a need for ripple suppression in many application scenarios, so the PSRR of the LDO becomes crucial. Usually, the DCDC converter is used as the first stage to convert high voltage to low voltage, and the LDO is used as the second stage for voltage regulation and ripple filtering, providing power to terminal devices. For example, the power supply of a camera requires an LDO with an output voltage of 2.8 V or 2.9 V, and the input voltage of the LDO is generally provided by a DCDC converter. Typically, the switching frequency of DCDC converters is in the range of several hundred kHz to several MHz, so the PSRR of LDO products above 100 kHz needs to be strictly designed.
◆The TPL9032 series is a high-PSRR low-noise linear regulator designed by 3PEAK.
◆When the output current of the TPL903228 is 10 mA, the device has the following PSRR performance versus ripple frequency:
■87.9 dB PSRR at 10 kHz
■61.4 dB PSRR at 100 kHz
■44.7 dB PSRR at 1 MHz
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high-PSRR low-noise linear regulator 、 high-PSRR low-noise LDO |
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2023/4/3 |
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DD20230303A0 |
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422 KB |
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