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参数资料
| 型号： | NCL30100ASLDGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 14/27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
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Rivc = 300k
Rivc = 510k
Rivc = 1 Meg
Rivc = 1.5 Meg
Rivc = 2.2 Meg
Rivc = 3.7 Meg
300
200
100
Rivc = 300k
Rivc = 510k
Rivc = 1 Meg
Rivc = 1.5 Meg
Rivc = 2.2 Meg
Rivc = 3.7 Meg
100
7
8
Rivc = infinity
9 10
11 12 13 14 15
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18
0
7
8
9
Rivc = infinity
10 11 12 13 14 15
16
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18
? 0.097 @ X 2 ) 24.5 @ X ) 1358.1
V CT +
^ 1.58 V
I CS + ? 0.75 @ IVC ) 50 @ 10 ? 6 [ m A]
INPUT VOLTAGE (V)
Figure 26. R ivc Impact versus V in for I LED =
700 mA Nominal
A value 1.5 M W was used since the input voltage has a
sinusoidal component due to the low voltage AC input and
desires to have a small bulk capacitance, thus compensating
for part of this variation.
The dependence of V CT on IVC current is described by the
following equation:
V CT + [V] (eq. 13)
976.8
Using the result from Equation 12 and put it to Equation 13
the V CT threshold will be calculated:
? 0.097 @ 7.91 2 ) 24.5 @ 7.91 ) 1358.1
976.8
(eq. 14)
The CT capacitance can be calculated using the equations
above:
INPUT VOLTAGE (V)
Figure 27. Rivc Impact versus V in for I LED =
350 mA Nominal
calculated value is not standard, so the nearest value 33 pF
has been selected.
Now we can calculate the I PK of LED. The average value
is set to 700 mA and the target ripple is set at 120 mA, the
I PK equals 760 mA. R shift has been chosen to be as small a
voltage drop as possible to minimize power dissipation so an
R shift of 100 m W has been selected.
Before calculation of R shift we need to know the I CS
current, which affects the offset on R shift . The I CS value
dependents on the IVC current and for IVC currents between
0 ? 50 m A, it can be described by this formula:
(eq. 16)
Therefore:
I CS + ? 0.75 @ IVC ) 50 @ 10 ? 6 (eq. 17)
+ ? 0.75 @ 7.91 @ 10 ? 6 ) 50 @ 10 ? 6 ^ 44.07 m A
I CT @ t OFF * CT delay
I +
? C CT +
+
dv @ C
dt V CT
50 @ 10 ? 6 @ 1.654 @ 10 ? 6 * 220 @ 10 ? 9
1.58
(eq. 15)
^ 45.8 pF
To calculate R shift it is necessary to know the I pk current
through the inductor. From the time that the current sense
comparator detects that the peak current threshold has been
crossed to the time that the external MOSFET switch is
turned off there is a propagation delay. Depending on the
value of the inductor selected (which is based on the target
The intrinsic pin capacitance CT pin (~8 pF) in
conjunction with the dimming transistor (~10 pF) in this
schematic approximately 18 pF so this value must be
switching frequency), there is a current error between the
intended peak current and the actual peak current, this is
illustrated in Figure 28.
subtracted from the calculated value in Equation 15. The
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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 |
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| 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: |
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