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参数资料
| 型号： | NCP3163PWG |
| 厂商： | ON Semiconductor |
| 文件页数： | 11/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BOOST INV ADJ 16SOIC |
| 标准包装： | 47 |
| 类型： | 降压（降压），升压（升压），反相 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 40V |
| 输入电压： | 2.5 V ~ 40 V |
| PWM 型： | 混合物 |
| 频率 - 开关： | 50kHz ~ 300kHz |
| 电流 - 输出： | 3.4A |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-SOIC W |
NCP3163, NCV3163
Calculation
Step ? Down
Step ? Up
Voltage ? Inverting
V sat
in
* V sat
in
(See Notes 1,2,3)
ton
toff
V
in
V out ) V F
* V sat * V out
V out ) V F
V
V
in
|V out| ) V F
V
off
t on
) 1
off
off
t on
) 1
off
off
t on
) 1
off
ton
?
t
t on
t
?
t
t on
t
?
t
t on
t
CT
32.143 · 10 * 6
f
* 20 @ 10 * 12
32.143 · 10 * 6
f
* 20 @ 10 * 12
32.143 · 10 * 6
f
* 20 @ 10 * 12
off
off
IL(avg)
Iout
I out
t on
t
) 1
I out
t on
t
) 1
D I
D I
D I
Ipk (Switch)
IL(avg) )
L
2
IL(avg) )
L
2
IL(avg) )
L
2
RSC
0.25
Ipk (Switch)
0.25
Ipk (Switch)
0.25
Ipk (Switch)
D I
D I
D I
L
V
in
* V sat * V out
L
t on
V
in
* V sat
L
t on
V
in
* V sat
L
t on
O
O
V ripple(pp)
D IL
1
8 ? CO
2
) (ESR)2
[
t on I out
C
[
t on I out
C
Vout
V
ref
R2
R1
) 1
V
ref
R2
R1
) 1
V
ref
R2
R1
) 1
The following Converter Characteristics must be chosen:
V in ?
V out ?
I out ?
D I L ?
Nominal operating input voltage.
Desired output voltage.
Desired output current.
Desired peak ? to ? peak inductor ripple current. For maximum output current it is suggested that D 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 D I L = 2(I L(avg) ). This will
proportionally reduce converter output current capability.
p ? Maximum output switch frequency.
V ripple(pp) ? Desired peak ? to ? peak 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.
NOTES:
NOTES:
NOTES:
NOTES:
1.
2.
3.
3.
V sat ? Saturation voltage of the output switch, refer to Figures 10 and 11.
V F ? Output rectifier forward voltage drop. Typical value for 1N5822 Schottky barrier rectifier is 0.5 V.
The calculated t on /t off must not exceed the minimum guaranteed oscillator charge to discharge ratio of 8, at the minimum
operating input voltage.
Figure 22. Design Equations
http://onsemi.com
11
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