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NCV890130MWTXG

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
NCV890130
http://onsemi.com
16
From the calculation:
RCOMP = 10.6 KW, CCOMP = 2 nF, Cp = 37 pF
So the feedback compensation network is as below:
Figure 32. Example of the Feedback Compensation Network
Vref
VOUT
RFB1
RFB2
RO
RCOMP
CCOMP
Cint
V
FB
V
VCOMP
31.6 W
0.8 V
18 pF
10 KW
2 nF
Cext
19 pF
100 W
g
m
*V
Figure 33 shows the bode plot of the OTA compensator
100 110
3
⋅ 110
4
⋅ 110
5
⋅ 110
6
⋅
90−
45−
0
45
90
180−
90−
0
90
180
(Hz)
(dB)
20 log Gerr_amp f
m()
⎣⎦⎣⎦
‧ arg Gerr_amp f
m
()()
180
p
‧
f
m
Figure 33. Bode Plot of the OTA Compensator
The total loop bode plot is as below:
100 110
3
⋅ 110
4
⋅ 110
5
⋅ 110
6
⋅
90−
45−
0
45
90
180−
90−
0
90
180
(Hz)
(dB)
20 log Gloop f
m()
⎣⎦⎣⎦
‧ arg Gloop f
m
()()
180
p
‧
f
m
Figure 34. Bode Plot of the Total Loop
The crossover frequency is at 70 KHz and phase margin is 75 degrees.
NCV890130
http://onsemi.com
17
PCB LAYOUT RECOMMENDATION
As with any switching power supplies, there are some
guidelines to follow to optimize the layout of the printed
circuit board for the NCV890130. However, because of the
high switching frequency extra care has to be taken.
− Minimize the area of the power current loops:
♦ Input capacitor ³ NCV890130 switch ³ Inductor
³ output capacitor ³ return through Ground
♦ Freewheeling diode ³ inductor ³ Output capacitor
³ return through ground
− Minimize the length of high impedance signals, and
route them far away from the power loops:
♦ Feedback trace
♦ Comp trace
ORDERING INFORMATION
Device Package Shipping
†
NCV890130MWTXG DFN8 with wettable flanks
(Pb−Free)
3000 / Tape & Reel
NCV890130PDR2G SOIC−8 EP
(Pb−Free)
2500 / Tape & Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
NCV890130
http://onsemi.com
18
PACKAGE DIMENSIONS
SOIC−8 EP
CASE 751AC
ISSUE B
H
C0.10
D
E1
A
D
PIN ONE
2 X
8 X
SEATING
PLANE
EXPOSED
GAUGE
PLANE
14
58
D
C0.10
A-B
2 X
E
B
e
C0.10
2 X
TOP VIEW
SIDE VIEW
BOTTOM VIEW
DETAIL A
END VIEW
SECTION A−A
8 X b
A-B0.25 D
C
C
C0.10
C0.20
A
A2
G
F
14
58
NOTES:
1. DIMENSIONS AND TOLERANCING PER
ASME Y14.5M, 1994.
2. DIMENSIONS IN MILLIMETERS (ANGLES
IN DEGREES).
3. DIMENSION b DOES NOT INCLUDE
DAMBAR PROTRUSION. ALLOWABLE
DAMBAR PROTRUSION SHALL BE
0.08 MM TOTAL IN EXCESS OF THE “b”
DIMENSION AT MAXIMUM MATERIAL
CONDITION.
4. DATUMS A AND B TO BE DETERMINED
AT DATUM PLANE H.
DIM MIN MAX
MILLIMETERS
A 1.35 1.75
A1 0.00 0.10
A2 1.35 1.65
b 0.31 0.51
b1 0.28 0.48
c 0.17 0.25
c1 0.17 0.23
D 4.90 BSC
E 6.00 BSC
e 1.27 BSC
L 0.40 1.27
L1 1.04 REF
F 2.24 3.20
G 1.55 2.51
h 0.25 0.50
q 0 8
h
AA
DETAIL A
(b)
b1
c
c1
0.25
L
(L1)
q
PAD
E1 3.90 BSC
__
A1
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
SOLDERING FOOTPRINT*
LOCATION
Exposed
Pad
1.52
0.060
2.03
0.08
0.6
0.024
1.270
0.050
4.0
0.155
ǒ
mm
inches
Ǔ
SCALE 6:1
7.0
0.275
2.72
0.107
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19

NCV890130MWTXG

Mfr. #:
Buy NCV890130MWTXG
Manufacturer:
ON Semiconductor
Description:
Switching Voltage Regulators 1.2A 2MHz Automotive
Lifecycle:
New from this manufacturer.
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