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L7987L Datasheet(PDF) 13 Page - STMicroelectronics

Part # L7987L
Description  Adjustable current limitation
PDF  41 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L7987L Datasheet(HTML) 13 Page - STMicroelectronics

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DocID026362 Rev 3
13/41
L7987L
Functional description
41
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) L7987L SYNCH pins are tied together, the L7987L 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.



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