ncp3127 ON Semiconductor, ncp3127 Datasheet - Page 15

• Manufacturer Part Number: ncp3127
• Description: Ncp3127 2 A Synchronous Pwm Switching Converter
• Manufacturer: ON Semiconductor

R
R
V
V
associated standard R
1
2
Table 5. OUTPUT VOLTAGE SETTINGS
OUT
REF
The most frequently used output voltages and their
V
O
0.8
1.0
1.1
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
2.55
3.83
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
10.2
11.5
10.2
10
10
10
10
10
(kW)
(eq. 39)
http://onsemi.com
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