AN2983 datasheet(4/32 Pages) STMICROELECTRONICS

Numer części	AN2983

Szczegółowy opis	Constant current inverse buck LED driver using L6562A

PDF	32 Pages

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Producent	STMICROELECTRONICS [STMicroelectronics]

Strona internetowa	http://www.st.com

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Main characteristics

AN2983

4/32

Doc ID 15679 Rev 1

Main characteristics

1.1

System configuration

Figure 2 shows a possible system configuration, in which the key modules are:

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the main power supply, which converts the AC input voltage to an internal power bus.

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the CC drivers, which are the modules that implement the constant current sources.

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the controller that configures the CC current drivers through a dedicated bus.

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the LEDs strings.

The CC drivers are the modules considered in this application note and implemented in the

EVL6562A-LED demonstration board.

Figure 2.

System configuration

1.2

Requirements

The board’s design takes into account the following key points.

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Input voltage: 48 V (+/- 20%)

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Output current (average): 0.35 A

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Output ripple current < 140 mA (+/- 20%)

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Output current setting/calibration

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Digital dimming

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Open-/short-circuit protection

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Absence of electrolytic capacitors

The design can be easily changed to adapt to different needs.

AN2983 Arkusz danych(PDF) 4 Page - STMicroelectronics