NCP3126CRAGEVB ON Semiconductor, NCP3126CRAGEVB Datasheet - Page 16
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NCP3126CRAGEVB
Manufacturer Part Number
NCP3126CRAGEVB
Description
BOARD EVALUATION NCP3126 CERAMIC
Manufacturer
ON Semiconductor
Series
-r
Datasheet
1.NCP3126AGEVB.pdf
(23 pages)
Specifications of NCP3126CRAGEVB
Design Resources
NCP3126 Schematic NCP3126CRAGEVB BOM
Main Purpose
DC/DC, Step Down
Outputs And Type
1, Non-Isolated
Power - Output
-
Voltage - Output
Adj down to 0.8V
Current - Output
3A
Voltage - Input
5V, 12V
Regulator Topology
Buck
Frequency - Switching
350kHz
Board Type
Fully Populated
Utilized Ic / Part
NCP3126
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
NCP3126CRAGEVBOS
C
f
R
R
R
The cross over of the overall feedback occurs at F
C
F
F
R
R
R
V
V
used to calculate the transconductance output compensation
network as follows:
C
F
gm
R
R
cross
C
239 pF +
F
LC
PO
PO
F
1
2
F
12.69 kHz +
F
1
2
F
IN
ramp
C
1
2
The cross over combined compensation network can be
PO
F
+
76 nF +
+
C
2p
2p
C
+
2p
2
F
12.69 kHz
R
= Feed through capacitor
= Crossover frequency
= Top resistor divider
= Bottom resistor divider
= Feed through resistor
= Feed through capacitor
= Frequency of the output inductor and capacitor
= Pole frequency
= Top of resistor divider
= Bottom of resistor divider
= Feed through resistor
= Input voltage
= Peak−to−peak voltage of the ramp
= Compensation capacitor
= Pole frequency
= Transconductance of amplifier
= Top of resistor divider
= Bottom of resistor divider
1
PO
2p
1
C
) R
31.6 kW
2
1
F
2
R
F
R
2
239 pF
) R
R
1
) R
2
R
R
10 kW ) 31.6 kW
2
1
1
20 kW ) 10 kW
F
2
) R
R
R
31.6 kW ) 20 kW
gm ³
10 kW
1
F
) R
2
R
) R
2
) R
F
2
31.6 kW ) 10 kW
1
R
1
R
F
4 ms
20 kW ) 10 kW
31.6 kW ) 20 kW
PO
f
cross
http://onsemi.com
10 kW ) 31.6 kW
:
R
F
) R
(eq. 42)
1
16
FLC
31.6 kW
V
ramp
20 kW
V
IN
³
30 kHz
20 kW ) 31.6 kW
(eq. 41)
(eq. 40)
2.82 kHz
1.1 V
12 V