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参数资料
| 型号： | NCL30100ASLDGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 13/27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
Application Design Example:
A typical step down application will be used to illustrate the basic design process based on nominal design parameters:
? Input voltage: V in ? 12 Vac (12 V dc after the bridge)
? Nominal LED current: 700 mA (rms)
? LED ripple : 120 mA (peak ? to ? peak)
? V LED : 3.2 V
? Freewheel diode V f : 0.5 V
? Target Switching Frequency: 450 kHz
Dimming using PWM signal 1 kHz with duty cycle 0 – 99%
Vac
D4
12 V
R2
A
D5
D6
C1
NCL30100
R1
D3
D1
Vac
D7
R3
R5
C2
IC1
CS DRV
GND VCC
CT
IVC
D2
Q1
Q2
L3
K
R4
C5
C3
DIMM
0/5 V
R9
R8
Figure 25. Example Design Schematic
t off
t ON ) t OFF
T +
+ 2.222 m s
+
f op
450 @ 10 3
dt I ripple
+ ^ 48.3 m H
I IVC +
^ 7.91 m A
+
Note this simplified step ? by ? step design process neglects
any parasitic contribution of the PCB.
First, we need to determine the nominal t ON /t OFF ratio:
t on V LED ) V f 3.2 ) 0.5 3.7
+ + + (eq. 7)
V in * V LED 12 * 3.2 8.8
Next the typical duty cycle (DC) will be calculated:
t ON 3.7
DC + + + 0.296 (eq. 8)
3.7 ) 8.8
Target switching frequency is set at 450 kHz, now we need
to determine the period:
1 1
(eq. 9)
Combination the previous equation we can calculate the t ON
and t OFF durations:
t ON + DC @ T + 0.296 @ 2.222 @ 10 ? 6 + 658 ns (eq. 10)
t OFF + (1 * DC) @ T + (1 * 0.296) @ 2.222 @ 10 ? 6
+ 1.564 m s
Now all the parameters are defined to calculate inductor
value:
di @ L V IN * V LED @ t ON
V + ? L +
(eq. 11)
(12 * 3.2) @ 658 @ 10 ? 9
0.12
A standard value 47 m H is chosen.
Next the CT capacitor can be calculated, but we need to
first determine the IVC current which can be simply
calculated.
V 12
R ) R IVC 1.5 @ 10 6 ) 17 @ 10 3 (eq. 12)
The IVC current controls the dependence of the peak
current to the input voltage. If the input voltage is well
regulated, the IVC pin should be grounded. The value for
IVC resistor should be chosen based on graphs below.
Note as well that the IVC can be used to implement analog
dimming since increasing the current into IVC pin will
decrease the I peak of the LED).
http://onsemi.com
13
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| 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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