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PM6685TR Datasheet(PDF) 21 Page - STMicroelectronics

No. de pieza PM6685TR
Descripción Electrónicos  Dual step-down main supply controller with auxilary voltages for notebook system power
PDF  52 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6685TR Datasheet(HTML) 21 Page - STMicroelectronics

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PM6685
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Figure 28. Constant on time PWM control
The duty cycle D of the buck converter in steady state is:
Equation 2
The PWM control works at a nearly fixed frequency fSW:
Equation 3
As mentioned the steady state switching frequency is theoretically independent from battery
voltage and from output voltage. Actually the frequency depends on parasitic voltage drops
that are present during the charging path (high side switch resistance, inductor resistance
(DCR)) and discharging path (low side switch resistance, DCR). As a result the switching
frequency increases as a function of the load current. Standard switching frequency values
can be selected for both sections by pin FSEL as shown in the following table:
Ton
Toff
Inductor
current
t
Output
voltage
Vreg
DC error
IN
OUT
V
V
D
=
ON
IN
OUT
ON
IN
OUT
ON
sw
K
1
V
V
K
V
V
T
D
f
=
×
=
=



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