参数资料
| 型号： | NCV890231MWTXG |
| 厂商： | ON Semiconductor |
| 文件页数： | 14/15页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 2A 10-DFN |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 0.8V |
| 输入电压： | 4.5 V ~ 36 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 2MHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-VFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 10-DFN（3x3） |
| 其它名称： | NCV890231MWTXGOSDKR |
NCV890231
I OUTac +
D I L D
I INac +
V IN
D I L
I DRMS + (1 * D) I OUT 2 )
Finally, the output capacitor must be able to sustain the ac
current (or RMS ripple current):
D I L
(eq. 4)
2 3
Typically, with the recommended 4.7 m H inductor, two
ceramic capacitors of 10 m F each in parallel give very good
results.
Freewheeling diode:
The diode must be chosen according to its maximum
current and voltage ratings, and to thermal considerations.
As far as max ratings are concerned, the maximum reverse
voltage the diode sees is the maximum input voltage (with
some margin in case of ringing on the Switch node), and the
maximum forward current the peak current limit of the
NCV890231, I LIM .
The power dissipated in the diode is P Dloss :
V OUT
P Dloss + I OUT @ 1 * @ V F ) I DRMS @ R D (eq. 5)
with:
? I OUT the average (dc) output current
? V F the forward voltage of the diode
? I DRMS the RMS current in the diode:
2
(eq. 6)
12
? R D the dynamic resistance of the diode (extracted from
the V/I curve of the diode in its datasheet).
ORDERING INFORMATION
Then, knowing the thermal resistance of the package and
the amount of heatsinking on the PCB, the temperature rise
corresponding to this power dissipation can be estimated.
Input capacitor:
The input capacitor must sustain the RMS input ripple
current I INac :
(eq. 7)
2 3
It can be designed in combination with an inductor to build
an input filter to filter out the ripple current in the source, in
order to reduce EMI conducted emissions.
For example, using a 4.7 m H input capacitor, it is easy to
calculate that an inductor of 200 nH will ensure that the
input filter has a cut ? off frequency below 200 kHz (low
enough to attenuate the 2 MHz ripple).
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 NCV890231. However, because of the
high switching frequency extra care has to be taken.
? Minimize the area of the power current loops:
? Input capacitor 3 NCV890231 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
Device
NCV890231MWTXG
Package
DFN10 with wettable flanks
(Pb ? Free)
Shipping ?
3000 / 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.
http://onsemi.com
14
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