参数资料
| 型号： | NCV887300D1R2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 10/11页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM CM 8-SOIC |
| 标准包装： | 1 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.1MHz |
| 占空比： | 89% |
| 电源电压： | 3.2 V ~ 40 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 150°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 标准包装 |
| 其它名称： | NCV887300D1R2GOSDKR |
NCV8873
V IN(min)
I L,peak +
Q g(total) v
I Q(max) + I L,peak
The maximum average inductor current can be calculated
as follows:
V OUT I OUT(max)
I L,avg +
The peak inductor current can be calculated as follows:
V IN(min) D max
L f s
Where: I L,peak : Peak inductor current value [A]
4. Select Output Capacitor
The output capacitor smoothes the output voltage and
reduces the overshoot and undershoot associated with line
transients. The steady state output ripple associated with the
output capacitors can be calculated as follows:
8. Select MOSFET(s)
In order to ensure the gate drive voltage does not drop out,
the selected MOSFET must not violate the following
inequality:
I drv
f s
Where: Q g(total) : Total Gate Charge of MOSFET(s) [C]
I drv : Drive voltage current [A]
f s : Switching Frequency [Hz]
The maximum RMS Current can be calculated as follows:
D(M max )
3
The maximum voltage across the MOSFET will be the
maximum output voltage, which is the higher of the
V OUT(ripple) +
I LED 1 * d (M max )
f s C OUT
maximum input voltage and the regulated output voltage:
V Q(max) + V OUT(max)
The capacitors must withstand an RMS ripple current as
follows:
9. Select Diode
The output diode rectifies the output current. The average
I Cout(RMS) +
I LED 2 ) d (M max )
I L,pk 2
3
* I L,pk I LED
current through diode will be equal to the output current:
I D(avg) + I OUT(max)
A 2.2 m F ceramic capacitor is usually sufficient for high
brightness LED applications for f s = 1 MHz.
5. Select Input Capacitors
The input capacitor reduces voltage ripple on the input to
the module associated with the ac component of the input
current.
Additionally, the diode must block voltage equal to the
higher of the output voltage or the maximum input voltage:
V D(max) + V OUT
The maximum power dissipation in the diode can be
calculated as follows:
P D + V f (max) I OUT(max)
I Cin(RMS) +
D(M max ) ) d (M max )
3
I L,pk 2 * I L,avg 2
Where: P d : Power dissipation in the diode [W]
V f(max) : Maximum forward voltage of the diode
[V]
V ref
I LED
6. Select Feedback Resistors
The feedback resistor provides LED current sensing for
the feedback signal. It may be calculated as follows:
R F1 +
7. Select Compensator Components
Current Mode control method employed by the NCV8873
allows the use of a simple Type II compensation to optimize
the dynamic response according to system requirements. A
transconductance amplifier is used, so compensation
Low Voltage Operation
If the input voltage drops below the UVLO or MOSFET
threshold voltage, another voltage may be used to power the
device. Simply connect the voltage you would like to boost
to the inductor and connect the stable voltage to the VIN pin
of the device. In Boost configuration, the output of the
converter can be used to power the device. In some cases it
may be desirable to connect 2 sources to VIN pin, which can
be accomplished simply by connecting each of the sources
through a diode to the VIN pin.
components must be connected between the compensation
pin and ground.
http://onsemi.com
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCV8873LEDBSTGEVB | 制造商:ON Semiconductor 功能描述:NCV8873 EVAL BD - Bulk 制造商:ON Semiconductor 功能描述:BOARD EVAL FOR NCV8873LEDBST |
| NCV8876 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Automotive Grade Start-Stop Non-Synchronous Boost Controller |
| NCV887600D1R2G | 制造商:ON Semiconductor 功能描述:AUTOMOTIVE GRADE NON-SYNC - Tape and Reel 制造商:ON Semiconductor 功能描述:IC REG CTRLR BST PWM CM 制造商:ON Semiconductor 功能描述:REEL / CREATING NEW OPN NCV88760 |
| NCV887601BSTGEVB | 制造商:ON Semiconductor 功能描述:NCV887601 EVAL BD - Bulk |
| NCV887601D1R2G | 制造商:ON Semiconductor 功能描述:AUTOMOTIVE GRADE NON-SYNC - Tape and Reel 制造商:ON Semiconductor 功能描述:AUTOMOTIVE GRADE NON-SYNC - Cut TR (SOS) 制造商:ON Semiconductor 功能描述:IC REG CTRLR BST PWM CM 制造商:ON Semiconductor 功能描述:REEL / AUTOMOTIVE GRADE NON-SYNC |
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