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参数资料
| 型号： | NCL30105GEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 14/22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
Drive
on
off
Internal
timer
adjustable
constant
Figure 25. A Timer is Started at the End of the On Time Duration
Protection
The NCL30105 includes several methods of protection.
One of the protection features is the maximum on time
limitation, which protects the system if the CS pin does not
receive a signal. The on time is internally limited to
t on(MAX) . The maximum on time limitation may occur if the
input voltage is too low or if the CS pin is shorted to ground.
After 8 consecutive maximum on times events, the
controller is latched as shown in Figure 26.
Fault
occurs
here
t on(MAX)
Smaller pulse:
countdown
Controller is
latched after
the 8th event
Count 1
2
1
2
3
4
5
6
7
8
Figure 26. The Protection Feature Limits the Maximum On Time
and Disables the Controller During a Fault
In latched mode, the controller consumes a low current
and waits for a complete V CC cycle (V CC decreases to less
than V CC(off) and then increased to greater than V CC(on) ) to
resume operation. The tracking of the fault events is
implemented with an up/down counter. The counter is
incremented by 1 when the t on(MAX) duration ends the
driving pulse. The counter is decremented by 1 when a
normal reset occurs via the current comparator. When the
counter reaches 0, it stores this value and waits for an up
pulse to change state.
The NCL30105 includes Leading Edge Blanking (LEB)
circuits to prevent inadvertent triggering of the current and
overcurrent comparators. When the DRV pin goes high,
noise is generated on the CS pin due to the parasitic elements
in the circuit. The LEB circuit “blanks” the noise to ensure
that the current and overcurrent comparators are not
inadvertently triggered. If the LEB circuit is omitted, the
noise causes the DRV to turn off before the required peak
current is reached as shown in Figure 28. This causes the
system to operate erratically. When the LEB circuit is
included, the noise is “blanked” by blinding the current
comparator for the LEB duration (t LEB ) and the required
peak current is reached as shown in Figure 29. The inclusion
of the LEB circuits prevents the erratic operation of the
system.
Another protection feature is the overcurrent detection.
The overcurrent detection activates when a short ? circuit
occurs in the inductor and LED string. To prevent false
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相关代理商/技术参数 |
参数描述 |
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| 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 |
| NCL30160DR2G | 功能描述:LED照明驱动器 40V LED Buck Regltr 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 |
| NCL30160GEVB | 功能描述:电源管理IC开发工具 40V, 1A LED Driver EVM RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| NCL30161MNTXG | 制造商:ON Semiconductor 功能描述:CONSTANT-CURRENT BUCK REG - Tape and Reel 制造商:ON Semiconductor 功能描述:Buck Reg,Constant Current,for LED Drive |
| NCL354MTD | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Cordless Phone Circuit |
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