AN3172 datasheet(5/31 Pages) STMICROELECTRONICS

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AN3172

Main characteristics and circuit description

Doc ID 17230 Rev 1

5/31

Main characteristics and circuit description

The main features of the SMPS are:

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Universal input mains range: 90

÷264 Vac - frequency 45 ÷ 65 Hz

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Output voltage: 19 V at 4.75 A continuous operation

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Mains harmonics: Acc. to EN61000-3-2 Class-D or JEITA-MITI Class-D

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Standby mains consumption: <0.3 W at 230 Vac

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Efficiency at nominal load: Better than 90 % at full load

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EMI: According to EN55022-Class-B

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Safety: According to EN60950

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Dimensions: 65x151 mm, 25 mm component maximum height

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PCB: Double side, 70 µm, FR-4, Mixed PTH/SMT

The circuit is composed of two stages; a front-end PFC using the L6563H and an LLC

resonant converter based on the L6599A.

The PFC stage works as the pre-regulator and powers the resonant stage with a constant

voltage of 400 V. The downstream converter operates only if the PFC is on and regulating its

output voltage. In this way, the resonant stage can be optimized for a narrow input voltage

range, improving the efficiency and the primary side power components.

AN3172 Datasheet(PDF) 5 Page - STMicroelectronics