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R5975D датащи(PDF) 22 Page - STMicroelectronics

номер детали R5975D
подробное описание детали  Up to 3 A step-down switching regulator for aerospace applications
PDF  47 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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R5975D датащи(HTML) 22 Page - STMicroelectronics

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R5975D
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DocID026878 Rev 1
7.3
PWM comparator
The PWM gain is given by the following formula:
Equation 12
where VOSCMAX is the maximum value of a sawtooth waveform and VOSCMIN is the
minimum value. A voltage feed-forward is implemented to ensure a constant GPWM. This is
obtained by generating a sawtooth waveform directly proportional to the input voltage VCC.
Equation 13
where K is equal to 0.076. Therefore the PWM gain is also equal to:
Equation 14
This means that even if the input voltage changes, the error amplifier does not change its
value to keep the loop in regulation, therefore ensuring a better line regulation and line
transient response.
In summary, the open loop gain can be expressed as:
Equation 15
Example:
Considering RC = 10 k, CC = 10 nF and CP = 120 pF, the poles and zeroes of A0 are:
FP1 = 20 Hz
FP2 = 130 kHz
FZ1 = 1.6 kHz
If L = 12 µH, COUT = 220 µF and ESR = 25 m, the poles and zeroes of ALC become:
FPLC = 2.5 kHz
F0 = 38 kHz
Finally, R1 = 5.6 k and R2 = 3.3 k.
GPWM s

Vcc
VOSCMAX VOSCMIN
–

-------------------------------------------------------------
=
VOSCMAX VOSCMIN
–
KVCC
=
GPWM s

1
K
----
const
==
Gs

GPWM s

R2
R1 R2
+
-------------------- AO s
 A
LC

s

=



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