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DN84

Part Number	DN84
Manufacturer	Zetex Semiconductors
Description	ZXSC400 Driving 3W high power LEDs
Published	Feb 11, 2015
Detailed Description	DN84 ZXSC400 Driving 3W high power LEDs Ray Liu, Applications Engineer, Zetex Semiconductors Description This design no...
Datasheet	DN84 PDF File

Overview

DN84 ZXSC400 Driving 3W high power LEDs Ray Liu, Applications Engineer, Zetex Semiconductors Description This design note shows the ZXSC400 driving a single 3W LED.
The input voltage ranges from 1.
8V to 3.
6V with constant output current of 700mA down to 2.
6V with an overall 80% of efficiency.
Figure 1 shows typical constant current solution with ZXSC400 driving one 3W LED.
The input voltage range allows the use of two alkaline batteries or one Lithium Ion cell (CR123A) for portable flashlight applications.
Q1 and Q2 forms a pseudo Darlington pair which provide enough current gain for a switching current up to 1.
5A.
In order to provide better switch off performance, a Schottky diode, D2, is ...

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