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参数资料
| 型号： | NCP3066SCBCKGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 8/20页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR NCP3066SCBCKG |
| 设计资源： | NCP3066 Buck SOIC EVB BOM NCP3066SCBCKGEVB Gerber Files NCP3066 BUCK EVB Schematic |
| 标准包装： | 1 |
| 电流 - 输出 / 通道： | 150mA |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 3.2V |
| 特点： | 亮度控制 |
| 输入电压： | 12V |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCP3066 |
| 其它名称： | NCP3066SCBCKGEVBOS |
NCP3066, NCV3066
Peak Current Sense Comparator
Under normal conditions, the output switch conduction is
initiated by the Voltage Feedback comparator and
terminated by the oscillator. Abnormal operating conditions
occur when the converter output is overloaded or when
feedback voltage sensing is lost. Under these conditions, the
I pk Current Sense comparator will protect the Darlington
output Switch. The switch current is converted to a voltage
by inserting a fractional ohm resistor, R Sense , in series with
V CC and Darlington output switch. The voltage drop across
R Sense is monitored by the Current Sense comparator. If the
voltage drop exceeds 200 mV (nom) with respect to V CC , the
comparator will set the latch and terminate the output switch
conduction on a cycle ? by ? cycle basis.
Darlington Switch is enabled again when the chip
temperature decreases under the low threshold. This feature
is provided to prevent catastrophic failures from accidental
device overheating. It is not intended to be used as a
replacement for proper heatsinking.
Output Switch
The output switch is designed in Darlington
configuration. This allows the application designer to
operate at all conditions at high switching speed and low
voltage drop. The Darlington Output Switch is designed to
switch a maximum of 40 V collector to emitter voltage and
current up to 1.5 A.
ON/OFF Function
The ON/OFF function provides interruption of switching
Real
V turn ? off on
R s Resistor
V ipk(sense)
di/dt slope
Io
t_delay
I1
I through the
Darlington
Switch
and puts the circuitry into the low consumption mode. This
feature is applicable for digital dimming of the LEDs as
well. The ON/OFF signal inhibits switching of the regulator
and reduces the average current through the LEDs. The
frequency of this pulse width ? modulated signal with the
duty cycle can range from less than 1% to 100% is limited
by the value of 1 kHz.
Pulling this pin below 0.8 V or leaving it opened turns the
Figure 13. Current Sense Waveform
The V IPK(Sense) Current Limit Sense Voltage threshold is
specified at static conditions. In dynamic operation the
sensed current turn ? off value depends on comparator
response time and di/dt current slope.
Real V turn ? off on R sc resistor
V turn_off = V ipk(sense) + R Sense *(t delay *di/dt)
Typical I pk comparator response time t delay is 350 ns. The
di/dt current slope is dependent on the voltage difference
across the inductor and the value of the inductor. Increasing
the value of the inductor will reduce the di/dt slope.
It is recommended to verify the actual peak current in the
application at worst conditions to be sure that the max peak
current will never get over the 1.5 A Darlington Switch
Current max rating.
Thermal Shutdown
Internal thermal shutdown circuitry is provided to protect
the IC in the event that the maximum junction temperature
is exceeded. When activated, typically at 160 ° C, the
Darlington Output Switch is disabled. The temperature
sensing circuit is designed with some hysteresis. The
regulator off. In this state the consumption of the device is
reduced below 100 uA. Pulling this pin above 2.4 V (up to
max. 25 V) allows the regulator running in normal state. If
the ON/OFF feature is not needed, the ON/OFF pin can be
wired to V CC , provided this voltage does not exceed 25 V.
No Output Capacitor Operation
A traditional buck topology includes an inductor followed
by an output capacitor which filters the ripple. The capacitor
is placed in parallel with the LED or array of LEDs to lower
the ripple current. A constant current buck regulator such as
the NCP3066 focuses on the control of the current through
the load, not the voltage across it. The switching frequency
of the NCP3066 is in the range of 100 ? 250 kHz which is
much higher than the human eye can detect. By configuring
the NCP3066 in a continuous conduction buck
configuration with low peak to peak ripple the output filter
capacitor can be eliminated. The important design
parameter is to keep the peak current below the maximum
current rating of the LED. Using 15 ? 40% peak to peak ripple
results in a good compromise between achieving max
average output current without exceeding the maximum
limit. This saves space and reduces part count for
applications.
http://onsemi.com
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相关代理商/技术参数 |
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| NCP3066SCBSTGEVB | 功能描述:电源管理IC开发工具 NCP3066 SOIC8 BOOST DB 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 |
| NCP308MT090TBG | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| NCP308MT120TBG | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| NCP308MT125TBG | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| NCP308MT150TBG | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
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