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L7983 Folha de dados(PDF) 20 Page - STMicroelectronics

Nome de Peças L7983
Descrição Electrónicos  60 V, 300 mA synchronous step-down switching regulator with 10 μA quiescent current
PDF  43 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L7983 Folha de dados(HTML) 20 Page - STMicroelectronics

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5.6.1
Overcurrent protection (OCP)
In normal operation the HS MOS is turned off when the sensed current is equal to programmed current (refer to
Figure 2). The maximum available current is limited by the internal OCP (overcurrent protection) comparator,
cycle by cycle. The IPK threshold is gradually reduced during the switching period by slope contribution, as shown
in Figure 18.
Figure 18. Peak current limit
IPK
ILX
TON_min
The inductor current is also monitored during LS MOS on-time. This feature, also known as “valley current
limitation”, is effective in case of current runaway due to HS MOS minimum on-time limitation and very low
VOUT / VIN ratio. This protection can avoid the HS MOS turn-on if the inductor current, sensed during LS MOS
on-time, is higher than the IVY threshold (Figure 19).
Figure 19. Valley current limit
IPK
IVY
TON_min
ILX
L7983
Fault management
DS13354 - Rev 1
page 20/43



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