LED6000PHR datasheet(13/49 Pages) STMICROELECTRONICS

Il numero della parte	LED6000PHR

Spiegazioni elettronici	3 A, 61 V monolithic current source with dimming capability

PDF	49 Pages

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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13 / 49 page

DocID027777 Rev 2

13/49

LED6000

Functional description

minimize the change of the PWM gain, the free-running frequency should be set (with a

resistor on the FSW pin) only slightly lower than the external clock frequency.

This pre-adjusting of the slave IC switching frequency keeps the truncation of the ramp

sawtooth negligible.

In case two or more (up to five) LED6000 SYNCH pins are tied together, the LED6000 IC

with higher programmed switching frequency is typically the master device; however, the

SYNCH circuit is also able to synchronize with a slightly lower external frequency, so the

frequency pre-adjustment with the same resistor on the FSW pin, as suggested above, is

required for a proper operation.

The SYNCH signal is provided as soon as EN is asserted high; however, if DIM is kept low

for more than TDIMTO timeout, the SYNCH signal is no more available until DIM re-assertion

high.

LED6000PHR Scheda tecnica(PDF) 13 Page - STMicroelectronics