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PM6675AS Datasheet(PDF) 17 Page - STMicroelectronics

Part # PM6675AS
Description  High efficiency step-down controller with embedded 2 A LDO regulator
PDF  48 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6675AS Datasheet(HTML) 17 Page - STMicroelectronics

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PM6675AS
Device description
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The Off-Time duration is solely determined by the output voltage: when lower than the set
value (i.e. the voltage at VSNS pin is lower than the internal reference = 0.6 V), the
synchronous rectifier is turned off and a new cycle begins (Figure 22).
Figure 22.
Inductor current and output voltage in steady state conditions
The duty-cycle of the buck converter is, in steady-state conditions, given by
Equation 2
The switching frequency is thus calculated as
Equation 3
where
Equation 4 a
Equation 4 b
Ton
Toff
Inductor
current
t
Output
voltage
Vreg
IN
OUT
V
V
D
=
OSC
OUT
OSC
OSC
SNS
OSC
IN
OUT
ON
SW
K
1
V
V
K
V
V
T
D
f
⋅
α
α
=
=
=
IN
OSC
OSC
V
V
=
α
OUT
SNS
OUT
V
V
=
α



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