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参数资料
| 型号： | NCP1595AMNTWG |
| 厂商： | ON Semiconductor |
| 文件页数： | 9/13页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 1.5A 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： | 1.5A |
| 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） |
NCP1595, NCP1595A, NCP1595C
DETAILED DESCRIPTION
Overview
The NCP1595/A/C is a synchronous PWM controller that
incorporates all the control and protection circuitry
necessary to satisfy a wide range of applications. The
NCP1595/A/C employs current mode control to provide fast
transient response, simple compensation, and excellent
stability. The features of the NCP1595/A/C include a
precision reference, fixed 1 MHz switching frequency, a
transconductance error amplifier, an integrated high ? side
P ? channel MOSFET and low ? side N ? Channel MOSFET,
internal soft ? start, and very low shutdown current. The
protection features of the NCP1595/A/C include internal
soft ? start, pulse ? by ? pulse current limit, and thermal
shutdown.
Reference Voltage
The NCP1595/A/C incorporates an internal reference that
allows output voltages as low as 0.8 V. The tolerance of the
internal reference is guaranteed over the entire operating
temperature range of the controller. The reference voltage is
trimmed using a test configuration that accounts for error
amplifier offset and bias currents.
Oscillator Frequency
A fixed precision oscillator is provided. The oscillator
frequency range is 1 MHz with $ 13% variation.
Transconductance Error Amplifier
The transconductance error amplifier ’s primary function
is to regulate the converter ’s output voltage using a resistor
divider connected from the converter ’s output to the FB pin
of the controller, as shown in the applications Schematic. If
a Fault occurs, the amplifier ’s output is immediately pulled
to GND and PWM switching is inhibited.
Internal Soft ? Start
To limit the startup inrush current, an internal soft start
circuit is used to ramp up the reference voltage from 0 V to
its final value linearly. The internal soft start time is 1 ms
Output MOSFETs
The NCP1595/A/C includes low R DS(on) , both high ? side
P ? channel and low ? side N ? channel MOSFETs capable of
delivering up to 1.5 A of current. When the controller is
disabled or during a Fault condition, the controller ’s output
stage is tri ? stated by turning OFF both the upper and lower
MOSFETs.
Adaptive Dead Time Gate Driver
In a synchronous buck converter, a certain dead time is
required between the low side drive signal and high side
drive signal to avoid shoot through. During the dead time,
the body diode of the low side FET freewheels the current.
The body diode has much higher voltage drop than that of
the MOSFET, which reduces the efficiency significantly.
The longer the body diode conducts, the lower the
efficiency. In NCP1595/A/C, the drivers and MOSFETs are
integrated in a single chip. The parasitic inductance is
minimized. Adaptive dead time control method is used to
prevent the shoot through from happening and minimizing
the diode conduction loss at the same time.
Pulse Width Modulation
A high ? speed PWM comparator, capable of pulse widths
as low as 50 ns, is included in the NCP1595/A/C. The
inverting input of the comparator is connected to the output
of the error amplifier. The non ? inverting input is connected
to the the current sense signal. At the beginning of each
PWM cycle, the CLK signal sets the PWM flip ? flop and the
upper MOSFET is turned ON. When the current sense signal
rises above the error amplifier’s voltage then the comparator
will reset the PWM flip ? flop and the upper MOSFET will
be turned OFF.
Current Sense
The NCP1595/A/C monitors the current in the upper
MOSFET. The current signal is required by the PWM
comparator and the pulse ? by ? pulse current limiter.
typically.
http://onsemi.com
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相关代理商/技术参数 |
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| NCP1595CMNTWG | 功能描述:直流/直流开关转换器 PWM CURRENT MODE 1.5A BUC 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 |
| NCP1595MNR2G | 功能描述:直流/直流开关转换器 PWM BUCK CONVERTER 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 |
| NCP1595MNT2G | 功能描述:直流/直流开关转换器 PWM BUCK CONVERTER 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 |
| NCP1596AMNTWG | 功能描述:电流型 PWM 控制器 1.5A BUCK DOWN CONVERTER RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| NCP1597AGEVB | 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 |
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