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參數(shù)資料
| 型號： | NCP3063 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C |
| 中文描述： | 1.5 A SWITCHING REGULATOR, 190 kHz SWITCHING FREQ-MAX, DSO8 |
| 封裝： | 4 X 4 MM, LEAD FREE, DFN-8 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大小： | 269K |
| 代理商： | NCP3063 |
NCP3063, NCP3063B, NCV3063
http://onsemi.com
9
(See Notes 9, 10, 11)
StepDown
StepUp
VoltageInverting
ton
toff
t
on
Vout
VSWCE
VF
Vin
Vout
Vout
Vin
VF
VSWCE
Vin
|Vout|
Vin
VF
VSWCE
ton
toff
f
ton
toff
1
ton
toff
f
ton
toff
1
ton
toff
f
ton
toff
1
C
T
CT
381.6
10
6
fosc
343
10
12
I
L(avg)
Iout
Iout
ton
toff
1
Iout
ton
toff
1
I
pk (Switch)
IL(avg)
IL
2
IL(avg)
IL
2
IL(avg)
IL
2
R
SC
0.20
Ipk (Switch)
0.20
Ipk (Switch)
0.20
Ipk (Switch)
L
Vin
VSWCE
Vout
IL
ton
Vin
VSWCE
IL
ton
Vin
VSWCE
IL
ton
V
ripple(pp)
IL
1
8
f
CO
2
(ESR)
2
tonIout
CO
IL
ESR
tonIout
CO
IL
ESR
V
out
VTH
R2
R1
1
VTH
R2
R1
1
VTH
R2
R1
1
The Following Converter Characteristics Must Be Chosen:
V
in
Nominal operating input voltage.
V
out
Desired output voltage.
I
out
Desired output current.
I
L
Desired peaktopeak inductor ripple current. For maximum output current it is suggested that I
L
be chosen to be
less than 10% of the average inductor current I
L(avg)
. This will help prevent I
pk (Switch)
from reaching the current limit threshold
set by R
SC
. If the design goal is to use a minimum inductance value, let I
L
= 2(I
L(avg)
). This will proportionally reduce
converter output current capability.
f
Maximum output switch frequency.
V
ripple(pp)
Desired peaktopeak output ripple voltage. For best performance the ripple voltage should be kept to a low
value since it will directly affect line and load regulation. Capacitor C
O
should be a low equivalent series resistance (ESR)
electrolytic designed for switching regulator applications.
9. V
SWCE
Darlington Switch Collector to Emitter Voltage Drop, refer to Figures 5, 6, 7 and 8.
10.V
F
Output rectifier forward voltage drop. Typical value for 1N5819 Schottky barrier rectifier is 0.4 V.
11.The calculated t
on
/t
off
must not exceed the minimum guaranteed oscillator charge to discharge ratio.
Figure 13. Design Equations
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| NCP3063B | 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C |
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