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| 型号： | NCL30100ASLDGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 15/27页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO SGL LAYER PWM DIM LED |
| 设计资源： | NCL30100 Schematic NCL30100 BOM NCL30100ASLDGEVB Gerber Files |
| 特色产品： | NCL30100 Fixed OFF-Time Buck LED Driver Controller |
| 标准包装： | 1 |
| 输出及类型： | 1，非隔离 |
| 特点： | 可调光 |
| 输入电压： | 12V |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCL30100 |
| 其它名称： | NCL30100ASLDGEVBOS |
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NCL30100
I peak
I cs
I LED
(V in -V LED )
L
t on
t d
-V LED - V diode
L
t off
Δ i L
Figure 28. A Current Error Between the Intended Peak Current and the Actual Peak Current
V +
di @ L
dt
? I delay +
V @ t
L
+
8.8 @ 215 @ 10 ? 9
47 @ 10 ? 6
(eq. 18)
Using the P DIE , we can calculate junction temperature:
Temp IC + T A ) P DIE @ R q JA + T A ) 0.0399 @ 178
+ T A ) 7.1 ° C
I CS
^ 0.0402 A
V/L is simply the slew rate through the inductor and t d is
the internal propagation delay so the current overshoot from
target is approximately 40 mA as calculated in Equation 18.
All values necessary for R shift calculation are known, the
R shift value is described by this formula:
R sense @ I pk * I delay ) V th
R shift +
(eq. 19)
0.1 @ (0.76 * 0.0402) ) 0.038
+ ^ 2496 W
44.07 @ 10 ? 6
This value of resistance can be a parallel combination of
2.7 k W and 30 k W .
To understand the operating junction temperature, we
calculate the die power dissipation:
P DIE + V CC @ 300 @ 10 ? 6 ) C MOSFET @ V CC @ f switching
+ 12 @ 300 @ 10 ? 6 ) 560 @ 10 ? 12 @ 12 @ 450 @ 10 3
+ 39.8 mW (eq. 20)
(eq. 21)
A design spreadsheet to aid in calculating the external
components necessary for a specific set of operating
conditions is available for download at the
ON Semiconductor website.
For a low voltage AC input diode D3 is placed into the Vcc
line. Since Capacitor C3 is charged from a sinusoidal
voltage. If the input voltage approaches zero, the IC is still
supplied from C3. Due to this diode, the IC keeps the LED
driver operating even if the sinusoidal voltage is lower than
V CC(min) until V in is lower than V LED . The use of this diode
make sense only if a single LED is used and the converter is
supplied by sinusoidal voltage 12 Vac. For two LEDs in
series their forward voltage is almost as high as V CC(min) of
the IC.
Parasitic capacitance and inductance are presented in real
applications which will have an influence on the circuit
operation. They are depending on the PCB design which is
user dependent. The BOM, PCB and some plots are enclosed
for better understanding of the system behavior.
http://onsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCL30100SNT1G | 功能描述:LED照明驱动器 LED DRIVER CONTROLLER RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| NCL30105 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Constant Off Time PWM Current-Mode Controller for LED Applications |
| NCL30105DR2G | 功能描述:LED照明驱动器 Flexible Dimmable Buck LED Driver Cont RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| NCL30105GEVB | 功能描述:LED 照明开发工具 80V 350 MA BUCK LED Driver RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
| NCL30160 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:1.0A Constant-Current Buck Regulator for Driving High Power LEDs |
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