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PM6680ATR bảng dữ liệu(PDF) 19 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  Dual synchronous step-down controller with adjustable output voltages plus LDO
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PM6680A
Device description
19/48
Figure 28.
Constant ON time PWM control
The duty cycle 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 input
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:
Table 6.
FSEL pin selection: typical switching frequency
Fsw@OUT1 = 3.3 V (kHz)
Fsw@OUT2 = 1.8 V (kHz)
FSEL = GND
195
335
FSEL = VREF
295
440
FSEL = LDO5
390
600
D
V
OUT
V
IN
--------------
=
f
SW
V
OUT
V
IN
--------------
K
on
V
OUT
V
IN
--------------
×
-------------------------------
1K
⁄
on
=
=



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