参数资料
| 型号： | NCP5222MNR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 16/28页 |
| 文件大小： | 0K |
| 描述： | IC CTLR BUCK 2CH 2PH 28QFN |
| 标准包装： | 4,000 |
| 应用： | 多相控制器 |
| 电流 - 电源： | 2.5mA |
| 电源电压： | 4.5 V ~ 27 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-VFQFN 裸露焊盘 |
| 供应商设备封装： | 28-QFN（4x4） |
| 包装： | 带卷 (TR) |
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NCP5222
turned off. The fault remains set until the system has
shutdown and re ? applied V CC and/or the enable signal EN
has toggled states.
Thermal Protection
The NCP5222 has a thermal shutdown protection to
protect the device itself from overheating when the die
temperature exceeds 150 ° C. After the thermal protection is
triggered, the fault state can be ended by re ? applying V CC
or EN when the die temperature drops down below 125 ° C.
Layout Guidelines
Figures 11 and 12 show exemplary layout of the power
stage components for dual ? channel configuration and
two ? phase configuration, respectively.
In the two ? phase mode, after the sharing switch is turned
on, the voltage difference across the sharing ? switch will
power delivery between the two phases. The smaller R DS(on)
of the sharing switch (R on_ssh ), the better the current balance
and the smaller output voltage deviation in V O2 . Actually,
the current through the sharing switch can be calculated by
I ssh = (V O2 ? V O1 ) / R on_effective , in which R on_effective =
R on_ssh + R pcb , and R pcb is the copper resistance between the
two output sensing points. So that too large R pcb effectively
wastes R DS(on) of the sharing switch, and thus reduces the
power sharing capability and enlarges V O2 deviation.
In a real application, to make sure the CH1 has perfect
voltage regulation, the V O1 sensing point and AGND can be
designed like remote sensing. In the meantime, to fully use
the sharing switch for the current sharing operation and
reduce V O2 deviation, the distance between the two sensing
points V O1 and V O2 should be arranged to be as close as
possible.
cause a current flow through it, which is used to balance
Figure 11. Layout Guidelines in Dual ? Channel Mode
http://onsemi.com
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