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AN938 データシート(PDF) 17 Page - STMicroelectronics

部品番号 AN938
部品情報  The L4973 family is a 3.5 A monolithic DC-DC converter
PDF  33 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN938 データシート(HTML) 17 Page - STMicroelectronics

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AN938
Typical application
Doc ID 5410 Rev 10
17/33
3
Typical application
Figure 22 shows the schematic of the L4973 demonstration board.
The selection of the external components allows the device to operate in the entire input
voltage range 8 V < VIN < 55 V. The output voltage is limited by the voltage rating of the
output capacitor so it can be adjusted in the range 3.3 V < VOUT < 30 V through the voltage
divider R3, R4. The input and output capacitors are able to sustain the RMS current in the
operating range.
3.1
Electrical specification
●
Input voltage range: 8 V - 55 V
●
Output voltage: 5.1 V ±3% (line, load and thermal)
●
Output ripple: 51 mV
●
Output current range: 1 mA - 3.5 A
●
Max output ripple current: 30% Iomax
●
Current limit: 4.5 A
●
Switching frequency: 150 kHz.
Figure 22.
Application circuit



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