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PDF SC34063A Data sheet ( Hoja de datos )
| Número de pieza | SC34063A | |
| Descripción | (SC33063A / SC34063A) Step-Up/Down/ Inverting Switching Regulators | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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MC34063A, MC33063A,
SC34063A, SC33063A,
NCV33063A
1.5 A, Step-Up/Down/
Inverting Switching
Regulators
The MC34063A Series is a monolithic control circuit containing the
primary functions required for DC−to−DC converters. These devices
consist of an internal temperature compensated reference, comparator,
controlled duty cycle oscillator with an active current limit circuit,
driver and high current output switch. This series was specifically
designed to be incorporated in Step−Down and Step−Up and
Voltage−Inverting applications with a minimum number of external
components. Refer to Application Notes AN920A/D and AN954/D
for additional design information.
Features
• Operation from 3.0 V to 40 V Input
• Low Standby Current
• Current Limiting
• Output Switch Current to 1.5 A
• Output Voltage Adjustable
• Frequency Operation to 100 kHz
• Precision 2% Reference
• Pb−Free Packages are Available
Drive 8
Collector
Ipk 7
Sense
6
VCC
Comparator 5
Inverting
Input
S Q Q2
R
100
Q1
Ipk
Oscillator
CT
Comparator
+
-
1.25 V
Reference
Regulator
1 Switch
Collector
2 Switch
Emitter
3 Timing
Capacitor
4
GND
(Bottom View)
This device contains 79 active transistors.
Figure 1. Representative Schematic Diagram
http://onsemi.com
8
1
8
1
SOIC−8
D SUFFIX
CASE 751
MARKING
DIAGRAMS
8
3x063
ALYWA
G
1
8
3x063V
ALYWA
G
1
PDIP−8
P, P1 SUFFIX
CASE 626
8
3x063AP1
AWL
YYWWG
1
8
33063AVP
AWL
YYWWG
1
DFN8
CASE 488AF
33063
ALYWA
1G
x
A
L, WL
Y, YY
W, WW
G or G
= 3 or 4
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 12 of this data sheet.
© Semiconductor Components Industries, LLC, 2010
August, 2010 − Rev. 23
1
Publication Order Number:
MC34063A/D
Free Datasheet http://www.datasheet4u.com/
1 page  
MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A
8
180
7
Rsc
0.22
Vin 6
12 V +
100
5
170 mH
L
1
SQ
R
Q2
Q1
Ipk CT
OSC
VCC
+
- Comp.
1.25 V
Ref
Reg
2
1N5819
3
CT
1500
pF
4
R1 2.2 k
R2
47 k
Vout
28 V/175 mA
+
330 CO
1.0 mH
Vout
+
100
Optional Filter
Test
Line Regulation
Load Regulation
Output Ripple
Efficiency
Output Ripple With Optional Filter
Conditions
Vin = 8.0 V to 16 V, IO = 175 mA
Vin = 12 V, IO = 75 mA to 175 mA
Vin = 12 V, IO = 175 mA
Vin = 12 V, IO = 175 mA
Vin = 12 V, IO = 175 mA
Figure 9. Step−Up Converter
Results
30 mV = ±0.05%
10 mV = ±0.017%
400 mVpp
87.7%
40 mVpp
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5
Free Datasheet http://www.datasheet4u.com/
5 Page 
MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A
Calculation
ton/toff
(ton + toff)
toff
ton
CT
Ipk(switch)
Rsc
L(min)
CO
Step−Up
Step−Down
Vout ) VF * Vin(min)
Vin(min) * Vsat
1
f
ton ) toff
ton
toff
)
1
(ton + toff) − toff
4.0 x 10−5 ton
ǒ Ǔ2Iout(max)
ton
toff
)
1
0.3/Ipk(switch)
ǒ Ǔ(Vin(min) * Vsat)
Ipk(switch)
ton(max)
Vout ) VF
Vin(min) * Vsat * Vout
1
f
ton ) toff
ton
toff
)
1
(ton + toff) − toff
4.0 x 10−5 ton
2Iout(max)
0.3/Ipk(switch)
ǒ Ǔ(Vin(min) * Vsat * Vout)
Ipk(switch)
ton(max)
9
Ioutton
Vripple(pp)
Ipk(switch)(ton ) toff)
8Vripple(pp)
Voltage−Inverting
|Vout| ) VF
Vin * Vsat
1
f
ton ) toff
ton
toff
)
1
(ton + toff) − toff
4.0 x 10−5 ton
ǒ Ǔ2Iout(max)
ton
toff
)
1
0.3/Ipk(switch)
ǒ Ǔ(Vin(min) * Vsat)
Ipk(switch)
ton(max)
9
Ioutton
Vripple(pp)
Vsat = Saturation voltage of the output switch.
VF = Forward voltage drop of the output rectifier.
The following power supply characteristics must be chosen:
Vin − Nominal input voltage.
ǒ ǓVout − Desired output voltage, |Vout| + 1.25
Iout − Desired output current.
1
)
R2
R1
fmin − Minimum desired output switching frequency at the selected values of Vin and IO.
Vripple(pp) − Desired peak−to−peak output ripple voltage. In practice, the calculated capacitor value will need to be increased due to its
equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly affect the
line and load regulation.
NOTE: For further information refer to Application Note AN920A/D and AN954/D.
Figure 17. Design Formula Table
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11
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet SC34063A.PDF ] | |
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