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AN2815 Datasheet(PDF) 35 Page - STMicroelectronics

Part # AN2815
Description  High-efficiency step-down controller
PDF  42 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2815 Datasheet(HTML) 35 Page - STMicroelectronics

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AN2815
PM6675AS demonstration tests
35/42
9.9
VOUT current limit
The valley current limit avoids any high-side turn-on if the inductor current is higher than the
programmed value. This current limit can be designed with the following equation:
Equation 2
The current sensing is performed by comparing the voltage drop in the low-side MOSFET,
during the TOFF period, with the voltage drop given by an injected current and the current
limit resistor.
Figure 31.
VOUT current limit protection during a load transient (0 A to 9 A at
2.5 A/
µs
DSon
LS
ILIM
CL
R
R
A
I
,
100
⋅
=
µ
AM00992v1



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