NCP3125 ON Semiconductor, NCP3125 Datasheet - Page 15
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NCP3125
Manufacturer Part Number
NCP3125
Description
4 A Synchronous PWM Switching Converter
Manufacturer
ON Semiconductor
Datasheet
1.NCP3125.pdf
(22 pages)
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Part Number
Manufacturer
Quantity
Price
Part Number:
NCP3125ADR2G
Manufacturer:
ON/安森美
Quantity:
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Part Number:
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Manufacturer:
ON/安森美
Quantity:
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R
R
V
V
associated standard R
Table 5. OUTPUT VOLTAGE SETTINGS
1
2
OUT
REF
The most frequently used output voltages and their
V
O
0.8
1.2
1.5
1.8
2.5
3.3
5.0
(V)
R
2
= Top resistor divider
= Bottom resistor divider
= Output voltage
= Regulator reference voltage
+ R
1
1
and R
@
R
1
4.99
12.7
21.5
31.6
52.3
1.0
V
10
(kW)
2
OUT
values are listed in Table 5.
V
REF
* V
REF
R
Open
2
11.5
10.2
10
10
10
10
(kW)
(eq. 39)
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15
Transconductance Error Amplifier can be calculated using
the method described below. The method serves to provide
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.
least 2X the value of R
noise. Using the 2X assumption, R
the feed through capacitor can be calculated as shown
below:
The compensation components for the Pseudo Type III
The value of the feed through resistor should always be at
2
to minimize error from feed through
F
will be set to 20 kW and
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