NCP3126ADR2G ON Semiconductor, NCP3126ADR2G Datasheet - Page 15

• Manufacturer Part Number: NCP3126ADR2G
• Description: DC/DC Switching Converters 3A PWM Switching Buck Regulator
• Manufacturer: ON Semiconductor

Specifications of NCP3126ADR2G

• Mounting Style: SMD/SMT
• Duty Cycle (max): 80 %
• Efficiency: 93 %
• Input / Supply Voltage (max): 13.2 V
• Input / Supply Voltage (min): 4.5 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Operating Temperature Range: - 40 C to + 125 C
• Output Current: 3 A
• Output Voltage: Adjustable
• Supply Current: 10 mA
• Switching Frequency: 350 KHz
• Package / Case: SOIC-8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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
1.0
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