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R5973D Folha de dados(PDF) 11 Page - STMicroelectronics

Nome de Peças R5973D
Descrição Electrónicos  Up to 2 A step-down switching regulator for aerospace applications
PDF  39 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

R5973D Folha de dados(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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