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L6986ITR Datasheet(PDF) 34 Page - STMicroelectronics

Part # L6986ITR
Description  38 V, 5 W synchronous iso-buck converter for isolated applications
PDF  60 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6986ITR Datasheet(HTML) 34 Page - STMicroelectronics

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Figure 40. Slave-to-master mode transition
The external master can force a latched SLAVE mode driving the SYNCH pin low at power-up, before the
soft-start begins the switching activity. So the oscillator frequency is 250 kHz typ. fixed until a new UVLO event
is triggered regardless FSW resistor value, that otherwise counts to design the slope compensation. The same
considerations above are also valid.
The master driving capability must be able to provide the proper signal levels at the SYNCH pin (see section 3):
•
Low level < VSYN THL = 0.7 V sinking 5 mA
•
High level > VSYN THH = 1.2 V sourcing 0.7 mA
Figure 41. Master driving capability to synchronize the L6986I
L6986I
Synchronization
DS13647 - Rev 1
page 34/60



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