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NCP3125
R 2 + R 1 @
V REF
V OUT * V REF
(eq. 39)
The compensation components for the Pseudo Type III
Transconductance Error Amplifier can be calculated using
the method described below. The method serves to provide
R 1 = Top resistor divider
R 2 = Bottom resistor divider
V OUT = Output voltage
V REF = Regulator reference voltage
The most frequently used output voltages and their
associated standard R 1 and R 2 values are listed in Table 5.
Table 5. OUTPUT VOLTAGE SETTINGS
V O (V) R 1 (k W ) R 2 (k W )
a good starting place for compensation of a power supply.
The values can be adjusted in real time using the
compensation tool comp calc, available for download at
ON Semiconductor ’s website.
The value of the feed through resistor should always be at
least 2X the value of R 2 to minimize error from feed through
noise. Using the 2X assumption, R F will be set to 20 k W and
the feed through capacitor can be calculated as shown
below:
0.8
1.2
1.5
1.8
2.5
3.3
5.0
1.0
4.99
10
12.7
21.5
31.6
52.3
Open
10
11.5
10.2
10
10
10
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15
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