AN938 datasheet(17/33 Pages) STMICROELECTRONICS

No. de pieza	AN938

Descripción Electrónicos	The L4973 family is a 3.5 A monolithic DC-DC converter

PDF	33 Pages

Scroll/Zoom	100%

Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

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17 / 33 page

AN938

Typical application

Doc ID 5410 Rev 10

17/33

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

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Output voltage: 5.1 V ±3% (line, load and thermal)

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Output ripple: 51 mV

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Output current range: 1 mA - 3.5 A

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Max output ripple current: 30% Iomax

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Current limit: 4.5 A

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Switching frequency: 150 kHz.

Figure 22.

Application circuit

AN938 Datasheet(PDF) 17 Page - STMicroelectronics