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参数资料
| 型号： | NCL30105GEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 17/22页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL 80V 350 FOR LED DRV |
| 设计资源： | NCL30105GEVB Gerber Files NCL30105GEVB BOM NCL30105GEVB Schematic |
| 标准包装： | 1 |
| 电流 - 输出 / 通道： | 350mA |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 60V |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCL30105 |
| 其它名称： | NCL30105GEVBOS |
NCL30105
R toff [k W ] +
Example Calculation
The design begins with the system requirements. The
following are the system requirements of an example
system:
Input Voltage (Vin) = 80 V
Number of LEDs = 18
LED forward Voltage = 3.33 V
t off [ m s] * 0.1214
0.1864
Where t off is entered in m s and R toff is calculated in k W .
* 0.1214
R toff + 2.5 0.1864 + 12.76 k W
R toff is selected as 12.7 k W .
The inductor value is calculated using the off time:
LED string Voltage (V LED ) = 60 V
LED average current (I LED ) = 350 mA
L +
V LED @ t off
dILED
(eq. 3)
T SW + 1 (eq. 1)
T SW +
+ 10 m s
L +
+ 1 mH
I LED(peak) + I LED ) dILED
2
LED ripple current ( D I LED ) = 150 mA ( ± 75 mA)
Operating frequency = 100 kHz
The switching period is calculated using the target
operating frequency:
f SW
1
100k
The off time (t off ) is calculated using the LED string
voltage, input voltage, and switching period:
60 @ 2.5 m
150m
The LED peak current (I LED(peak) ) is also the inductor
peak current and is calculated using the average LED current
and the LED ripple current:
(eq. 4)
2
I LED(peak) + 350m ) 150m + 425 mA
It is critical that the inductor saturation current is greater
t off + 1 * LED @ T SW
V
V in
(eq. 2)
than the peak current. Sufficient margin is generally set to
20%. For 20% margin, the inductor should be selected to
have a saturation current greater than 510 mA. The sense
V ILIM
I LED(peak)
80
t off + 1 * 60 @ 10 m s + 2.5 m s
To set toff, the following calculation is used based on the
resistor (R sense ) value is calculated using the peak current:
R sense + (eq. 5)
on the approximation of the linear region of the t off vs. R toff
transfer function as shown in Figure 17:
R sense +
1
0.425
+ 2.35 W
http://onsemi.com
17
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