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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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LED6000PHR bảng dữ liệu(PDF) 13 Page - STMicroelectronics |
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LED6000PHR bảng dữ liệu(HTML) 13 Page - STMicroelectronics |
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13 / 49 page  DocID027777 Rev 2 13/49 LED6000 Functional description 49 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. |
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