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参数资料
| 型号： | NCP1595AGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 9/13页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL NCP1595 SYNC CONV |
| 设计资源： | NCP1595AGEVB Schematic NCP1595AGEVB Test Procedure NCP1595AGEVB Gerber Zip NCP1595AGEVB Bill of Materials |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.8V |
| 电流 - 输出： | 1.5A |
| 输入电压： | 4 V ~ 5.5 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 1MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCP1595A |
| 其它名称： | NCP1595AGEVB-ND NCP1595AGEVBOS |
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.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1595AMNR2G | 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 |
| NCP1595AMNTWG | 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 |
| 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 |
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