LED2000DR datasheet(30/40 Pages) STMICROELECTRONICS

Part #	LED2000DR

Description	3 A monolithic step-down current source with synchronous rectification

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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Application information

LED2000

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DocID023432 Rev 4

higher than the nominal value thanks to the increased voltage drop across stray

components. In most of the application conditions the pulse-by-pulse current limitation is

effective to limit the inductor current. Whenever the current escalates, a second level current

protection called “Hiccup mode” is enabled. Hiccup protection offers an additional protection

against heavy short-circuit conditions at very high input voltage even considering the spread

of the minimum conduction time of the power element. If the hiccup current level (6.2 A

typical) is triggered, the switching activity is prevented for 12 cycles.

Figure 18 shows the operation of the constant current protection when a short-circuit is

applied at the output at the maximum input voltage.

Figure 18. Constant current protection triggering hiccup mode

7.5

Application circuit

Figure 19. Demonstration board application circuit

AM12909v1

LED2000

LED2000DR Datasheet(PDF) 30 Page - STMicroelectronics