参数资料
| 型号： | NCP5215MNR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 16/21页 |
| 文件大小： | 0K |
| 描述： | IC CTLR SYNC BUCK DUAL 40-QFN |
| 产品变化通告： | Product Discontinuation 01/Oct/2008 |
| 标准包装： | 2,500 |
| 应用： | 控制器，笔记本电脑电源系统 |
| 输入电压： | 4.5 V ~ 24 V |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 3 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 供应商设备封装： | 40-QFN（6x6） |
| 包装： | 带卷 (TR) |
NCP5215
are turned off and their outputs are float. The fault remains
set until the system has shutdown and re ? applied power or
the enable input signal to the regulator controller has
toggled states.
Overvoltage Protection (OVP)
An OVP circuit monitors the output voltages to prevent
from over voltage. OVP limit is typically 117% of the
nominal output voltage level. If the output voltage is above
this threshold, an OV fault is set, the top gate drive is turned
OFF, and then the bottom gate drive is latched ON to
discharge the output. The fault remains set until the system
has shutdown and re ? applied power or the enable input
signal to the regulator controller has toggled states.
Undervoltage Protection (UVP)
A UVP circuit monitors the output voltages to detect
undervoltage. UVP limit is 68% of the nominal output
voltage level. If the output voltage is below this threshold,
a UV fault is set. If an OV protection is set before, the
bottom gate drive is forced high. If no OV protection set,
an internal fault timer will be triggered to count normal
operation clock. After 16 continuous clock pulses, if the
fault still exists the part latches off, both the top gate drive
and the bottom gate drive are turned off and their outputs
are float. The fault remains set until the system has
shutdown and re ? applied power or the enable input signal
to the regulator controller has toggled states.
Thermal Protection
The NCP5215 has a thermal shutdown protection to
protect the device from overheating when the die
temperature exceeds 150 ° C. Once the thermal protection is
triggered, the fault state can be ended by re ? applying V CC ,
V IN , or ENBL when the temperature drops down below
120 ° C.
VCCA
t SFT_START
VIN
ENBL
Vo
PGOOD
32 Cycles
VCCA goes
above 4.4V to
enable the IC
PGOOD Goes High
ENBL goes high. Vo is enabled but not
actived until VIN goes above 3.5V.
Soft ? Start
Completed
PGOOD Goes Low
Figure 33. Powerup and Powerdown Timing Diagram per Channel
http://onsemi.com
16
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