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| 型号： | NCP3065PG |
| 厂商： | ON Semiconductor |
| 文件页数： | 8/18页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR HP CONST CURR 8-DIP |
| 标准包装： | 50 |
| 恒定电流： | 是 |
| 拓扑： | PWM，降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载 |
| 类型 - 次要： | 高亮度 LED（HBLED） |
| 频率： | 250kHz |
| 电源电压： | 3 V ~ 40 V |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-PDIP |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 125°C |
| 产品目录页面： | 1120 (CN2011-ZH PDF) |
| 其它名称： | NCP3065PGOS |
NCP3065, NCV3065
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 SC , in series with
V CC and the Darlington output switch. The voltage drop
across R SC is monitored by the Current Sense comparator.
If the voltage drop exceeds 200 mV (nom) with respect to
LED Dimming
The COMP pin of the NCP3065 is used to provide
dimming capability. In digital input mode the PWM input
signal inhibits switching of the regulator and reduces the
average current through the LEDs. In analog input mode a
PWM input signal is RC filtered and the resulting voltage is
summed with the feedback voltage thus reduces the average
current through the LEDs. Figure 15 illustrated the linearity
of the digital dimming function with a 200 Hz digital PWM.
For further information on dimming control refer to
application note AND8298.
V CC , the comparator will set the latch and terminate the
output switch conduction on a cycle ? by ? cycle basis. This
Comparator/Latch configuration ensures that the Output
Switch has only a single on ? time during a given oscillator
800
700
600
24 V in , V f = 7.2 V
24 V in , V f = 3.6 V
cycle.
Real
V turn ? off on
R s Resistor
di/dt slope
I1
I through the
Darlington
500
400
300
200
12 V in , V f = 3.6 V
V ipk(sense)
Io
t_delay
Switch
100
0
0
10
20
30
40
50
60
70
80
90 100
DUTY CYCLE (%)
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
Vturn_off + Vipk(sense) ) Rsc @ (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 165 ° C, the
Darlington Output Switch is disabled. The temperature
sensing circuit is designed with some hysteresis. The
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.
Figure 15.
No Output Capacitor Operation
A constant current buck regulator such as the NCP3065
focuses on the control of the current through the load, not the
voltage across it. The switching frequency of the NCP3065
is in the range of 100 ? 250 kHz which is much higher than
the human eye can detect. This allows us to relax the ripple
current specification to allow higher peak to peak values.
This is achieved by configuring the NCP3065 in a
continuous conduction buck configuration with low peak to
peak ripple thus eliminating the need for an output filter
capacitor. The important design parameter is to keep the
peak current below the maximum current rating of the LED.
Using 15% 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 that require a compact footprint.
(Example: See Figure 17) See application note AND8298
for more information.
Output Switch
The output switch is designed in a 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.
http://onsemi.com
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相关代理商/技术参数 |
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| NCP3065PG | 制造商:ON Semiconductor 功能描述:IC VOLTAGE REGULATOR |
| NCP3065SOBCKGEVB | 功能描述:电源管理IC开发工具 NCP3065 BUCK DEMO BD 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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| NCP3066DR2G | 功能描述:直流/直流开关调节器 1.5A SW REG FOR LED W/ENABLE 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 |
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