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L6983 Datasheet(PDF) 23 Page - STMicroelectronics

Part # L6983
Description  38 V, 3 A synchronous step-down converter with 17 μA quiescent current
PDF  63 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6983 Datasheet(HTML) 23 Page - STMicroelectronics

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In most of the overcurrent conditions, the conduction time of the high-side switch is higher than the masking time
and so the peak current protection limits the switch current.
IMAX=IPK
(8)
The DC current flowing in the load in overcurrent condition is:
IDCOUT=IMAX−IRIPPLEVOUT
2 =IMAX− VIN− VOUT
2∙L ∙TON
(9)
The Figure 20. Soft-start procedure with VOUT shorted to GND shows the L6983 soft-start procedure with VOUT
shorted to GND.
Figure 20. Soft-start procedure with VOUT shorted to GND
The Figure 21. Over current procedure with persistent short circuit between VOUT and GND shows the L6983 over
current protection with a persistent short circuit between VOUT and GND.
L6983
Overcurrent protection
DS13116 - Rev 1
page 23/63



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