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R5973D 데이터시트(PDF) 11 Page - STMicroelectronics

부품명 R5973D
상세설명  Up to 2 A step-down switching regulator for aerospace applications
PDF  39 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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R5973D 데이터시트(HTML) 11 Page - STMicroelectronics

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R5973D
Functional description
39
Figure 4. Oscillator circuit block diagram
Figure 5. Synchronization example
5.4
Current protection
The R5973D device features two types of current limit protection: pulse-by-pulse and
frequency foldback.
The schematic of the current limitation circuitry for the pulse-by-pulse protection is shown in
Figure 6. The output power PDMOS transistor is split into two parallel PDMOS transistors.
The smallest one includes a resistor in series, RSENSE. The current is sensed through
RSENSE and if it reaches the threshold, the mirror becomes unbalanced and the PDMOS is
switched off until the next falling edge of the internal clock pulse. Due to this reduction of the



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