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PM6685 Folha de dados(PDF) 21 Page - STMicroelectronics

Nome de Peças PM6685
Descrição Electrónicos  Dual step-down main supply controller with auxilary voltages for notebook system power
PDF  52 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6685 Folha de dados(HTML) 21 Page - STMicroelectronics

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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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