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A6986F Datasheet(PDF) 32 Page - STMicroelectronics

Part # A6986F
Description  38 V 1.5 A synchronous step-down switching regulator
PDF  72 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

A6986F Datasheet(HTML) 32 Page - STMicroelectronics

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A6986F
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DocID027739 Rev 1
sense threshold. The low-side operation is able to prevent the high-side turn on, so the
device can skip pulses decreasing the swathing frequency.
Figure 23. Valley current sense operation in overcurrent condition
Figure 23 shows the switching frequency reduction during the valley current sense
operation in case of extremely low duty cycle (VIN 38 V, fSW = 500 kHz short-circuit
condition).
In a worst case scenario (like Figure 23) of the overcurrent protection the switch current is
limited to:
Equation 15
where IVALLEY_TH is the current threshold of the valley sensing circuitry (see Table 5:
Electrical characteristics on page 8) and TMASK_HS is the masking time of the high-side
switch 100 nsec. typ.).
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.
Equation 16
IMAX = IPEAK_TH
IMAX
IVALLEYTH
VIN VOUT
–
L
------------------------------ TMASKHS
+
=



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