参数资料
| 型号： | NCP3122MNTXG |
| 厂商： | ON Semiconductor |
| 文件页数： | 15/42页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 2A DL 32QFN |
| 产品变化通告： | NCP312x Soft Start Charge 6/Nov/2008 |
| 标准包装： | 4,000 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 可调至 0.8V |
| 输入电压： | 4.5 V ~ 15 V |
| 频率 - 开关： | 200kHz ~ 2.2MHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 32-QFN（5x5） |
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NCP3122
APPLICATION & DESIGN INFORMATION
I LP + I LOAD ) 1 D I L
V OUT V IN * V OUT
V IN @ D I L @ f OSC
I LP + I LOAD )
Inductor
The output inductor may be the most critical component
in the converter because it will directly affect the choice of
other components and dictate both the steady state and
transient performance of the converter. When choosing
inductors, one might have to consider maximum load
current, core and copper losses, component height, output
ripple, EMI, saturation and cost. Lower inductor values are
chosen to reduce the physical size of the inductor. A higher
value cuts down the ripple current and core losses and allows
more output current. In general, the output inductance value
should be as low and the output inductor physically as small
as possible to provide the best transient response and
minimum cost. If a large inductance value is used, the
converter will not respond quickly to rapid changes in the
load current. On the other hand, an inductance value that is
too low will result in very large ripple currents in the power
components, resulting in increased dissipation and lower
converter efficiency.
A good standard for determining the inductance to use is
to select the inductor peak ? to ? peak ripple current to be
approximately 25% of the maximum switch current. Also,
make sure that the inductor peak current is below the
maximum switch current limit and the selected inductor type
saturation current specification is higher than the peak
current through the switch.
The maximum current in the inductor while operating in
the continuous current mode is defined as the load current
plus one half of the D I L currrent:
2
The inductance value can be calculated by:
L +
Therefore, the inductor peak current, I LP , can be
calculated by:
V OUT V IN * V OUT
2 @ V IN @ L @ f OSC
where;
I LOAD is the output load current
V OUT is the output voltage
V IN is the input voltage
D I L is the peak ? to ? peak inductor ripple current
f OSC is the switching frequency of the oscillator
The choice of the appropriate inductor type depends not
only on the calculated inductance value, saturation current
rating and parasitic serial resistance, but also on the required
physical dimensions, EMI requirements (shielded or open
inductor) and the price. Examples of suitable inductors from
various manufacturers are shown in the table below.
Table 1. Calculated Inductor Values
Calculated coils, I ripple peak ? peak 20%
f [kHz]
200
350
500
750
1400
2200
I out [A]
12 V in to 7.5 V out
12 V in to 5 V out
12 V in to 3.3 V out
5 V in to 3.3 V out
5 V in to 2.5 V out
5 V in to 1.8 V out
1A
2A
1A
2A
1A
2A
1A
2A
1A
2A
1A
2A
70 m H
36 m H
73 m H
36 m H
60 m H
30 m H
28 m H
14 m H
31 m H
16 m H
29 m H
15 m H
40 m H
20 m H
42 m H
20 m H
34 m H
17 m H
16 m H
8 m H
18 m H
9 m H
16.5 m H
8.2 m H
28 m H
14 m H
29 m H
15 m H
24 m H
12 m H
11.2 m H
5.6 m H
12.5 m H
6.3 m H
11.5 m H
5.8 m H
18.7 m H
10 m H
20 m H
10 m H
16 m H
8 m H
7.5 m H
3.7 m H
8.3 m H
4 m H
7.7 m H
3.8 m H
10 m H
5 m H
10.4 m H
5.2 m H
8.5 m H
4.3 m H
4 m H
2 m H
4.5 m H
2.2 m H
4 m H
2 m H
6.4 m H
3.2 m H
6.6 m H
3.3 m H
5.5 m H
2.7 m H
2.5 m H
1.3 m H
2.8 m H
1.4 m H
2.6 m H
1.3 m H
http://onsemi.com
15
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