参数资料
| 型号： | NCP3122MNTXG |
| 厂商： | ON Semiconductor |
| 文件页数： | 14/42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
voltage until the SS capacitor is charged/discharged to a
voltage higher than 0.8 V.
Power Good
The power good is an open drain and active high output
that indicates when the output voltage has reached 90%
(min) of the nominal output voltage. This output can be
pulled up to the appropriate level with an external resistor.
The power good comparator senses the voltage at the FB
pin, which is a function of V out .
The power good output transistor behavior is shown in the
“Typical Operating Characteristics” section. The PG pin is
held low during a soft ? start. Once a soft ? start is completed,
the PG goes high if there are no faults and no delays
associated with it.
Current Limit
The NCP3122 protects a power system if overcurrent
occurs. The NCP3122 contains pulse ? by ? pulse current
limiting to protect the power switch and external
components. The current through each channel is
continuously monitored. The current limit is set to allow
peak switch current in excess of 2.6 A (minimum). Current
limiting is implemented by monitoring the high ? side
P ? channel switch current during conduction with a current
limit comparator. When the peak of the switching current
reaches the current limit, the power switch turns off.
Hiccup Overload Protection (OLM – Over Load Mode)
Hiccup mode is a method of protecting the power supply
from damage during overload conditions. Within normal
operation, the external soft ? start capacitor is pulled up by a
current source that delivers 8.75 m A to the SS pin capacitor.
The soft ? start capacitor continues to charge until it reaches
the saturation voltage of the current source, typically V ss =
4 V. When the overload condition is detected, the soft ? start
capacitor is discharged to 0.1 V and is again charged to 1 V.
This is periodically repeated until the overload condition is
detected. The transconductance error amplifier output is tied
to ground when the soft ? start capacitor is discharged.
Figure 37. Hiccup Overload Protection
Thermal Shutdown
The NCP3122 has a thermal shutdown feature to protect
the device from overheating when the die temperature
exceeds 160 ° C (typically). If the chip temperature exceeds
the overtemperature shutdown trip point, the fault signal is
activated. This will disable the step down converter
operation, and the chip temperature will start to decrease.
When the chip temperature drops 15 ° C below the
overtemperature shutdown trip point, the fault signal is
deactivated and the step down converter operation starts
again with soft ? start. The thermal event sends the device
immediately into the OFF state. The currrent consumption
is equal 5 mA (typical) if the thermal condition is reached.
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