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R5973ADTR Datasheet(PDF) 11 Page - STMicroelectronics

Part # R5973ADTR
Description  Up to 1.5 A step-down switching regulator for aerospace applications
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

R5973ADTR Datasheet(HTML) 11 Page - STMicroelectronics

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R5973AD
Functional description
38
Figure 4. Oscillator circuit block diagram
Figure 5. Synchronization example
5.4
Current protection
The R5973AD 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
ON time, the output voltage decreases. Since the minimum switch ON time necessary to
sense the current in order to avoid a false overcurrent signal is too short to obtain
a sufficiently low duty cycle at 500 kHz (see Section 8.4 on page 26), the output current in


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