参数资料
| 型号： | NCP1597AMNTWG |
| 厂商： | ON Semiconductor |
| 文件页数： | 10/13页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 2A 6DFN |
| 标准包装： | 3,000 |
| 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 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-VDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 6-DFN（3x3） |
NCP1597A
PROTECTIONS
Undervoltage Lockout (UVLO)
The under voltage lockout feature prevents the controller
from switching when the input voltage is too low to power
the internal power supplies and reference. Hysteresis must
be incorporated in the UVLO comparator to prevent IxR
drops in the wiring or PCB traces from causing ON/OFF
cycling of the controller during heavy loading at power up
or power down.
Overcurrent Protection (OCP)
NCP1597A detects high side switch current and then
compares to a voltage level representing the overcurrent
threshold limit. If the current through the high side FET
exceeds the overcurrent threshold limit for seven
consecutive switching cycles, overcurrent protection is
triggered.
Once the overcurrent protection occurs, hiccup mode
engages. First, hiccup mode, turns off both FETs and
discharges the internal compensation network at the output
of the OTA. Next, the IC waits typically 2 ms and then resets
the overcurrent counter. After this reset, the circuit attempts
another normal soft ? start. During soft ? start, the overcurrent
overcurrent detection while charging the output capacitors.
Hiccup mode reduces input supply current and power
dissipation during a short circuit. It also allows for much
improved system up ? time, allowing auto ? restart upon
removal of a temporary short ? circuit.
Pre ? Bias Startup
In some applications the controller will be required to start
switching when it’s output capacitors are charged anywhere
from slightly above 0 V to just below the regulation voltage.
This situation occurs for a number of reasons: the
converter ’s output capacitors may have residual charge on
them or the converter ’s output may be held up by a low
current standby power supply. NCP1597A supports
pre ? bias start up by holding Low side FETs off till soft start
ramp reaches the FB Pin voltage.
Thermal Shutdown
The NCP1597A protects itself from over heating with an
internal thermal monitoring circuit. If the junction
temperature exceeds the thermal shutdown threshold both
the upper and lower MOSFETs will be shut OFF.
protection threshold is increased to prevent false
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1597BGEVB | 功能描述:电源管理IC开发工具 EVB RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| NCP1597BMNTWG | 功能描述:直流/直流开关调节器 SYNC BUCK CONTROLLER RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| NCP1599GEVB | 功能描述:电源管理IC开发工具 NCP1599 EVB RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| NCP1599MNTWG | 功能描述:直流/直流开关转换器 SYNC BUCK CONTROLLER RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| NCP15WB333E03RC | 制造商:Murata Manufacturing Co Ltd 功能描述:LEADED NTC THERMISTOR |
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