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PM6675 Datasheet(PDF) 16 Page - STMicroelectronics

Part # PM6675
Description  Very fast load transient response using constant on-time control loop
PDF  47 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6675 Datasheet(HTML) 16 Page - STMicroelectronics

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Device description
PM6675
16/47
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 4a
Equation 4b
Referring to the typical application schematic (figures on cover page and Figure 5), the final
expression is then:
Equation 5
Even if the switching frequency is theoretically independent from battery and output
voltages, parasitic parameters involved in the power path (like MOSFETs' on-resistance and
inductor's DCR) introduce voltage drops responsible for a slight dependence on load
current. In addition, the internal delay is due to a small dependence on input voltage.
The PM6675 switching frequency can be set by an external divider connected to the VOSC
pin.
Figure 5.
Switching frequency selection and VOSC pin
The voltage seen at this pin must be greater than 0.8V and lower than 2V in order to ensure
the system's linearity.
D
V
OUT
V
IN
--------------
=
OSC
OUT
OSC
OSC
SNS
OSC
IN
OUT
ON
SW
K
1
V
V
K
V
V
T
D
f
⋅
α
α
=
=
=
α
OSC
V
OSC
V
IN
---------------
=
α
OUT
V
SNS
V
OUT
--------------
=
OSC
2
1
2
OSC
OSC
SW
K
1
R
R
R
K
f
⋅
+
=
α
=
PM6675
VOSC
R1
R2
VIN
PM6675
VOSC
R1
R2
VIN



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