AD8240: LED Driver/Monitor |
The AD8240 LED driver/monitor, in combination with an external transistor, supplies a constant 12 V to drive LED lamps. This allows cost-effective LED lamp monitoring and short-circuit protection. The output is regulated at 12 V when the supply voltage is between 12.5 V and 27 V.
A CMOS compatible, level-dependent, digital input can be used for PWM control of the LED brightness. VO is ...More
The AD8240 LED driver/monitor, in combination with an external transistor, supplies a constant 12 V to drive LED lamps. This allows cost-effective LED lamp monitoring and short-circuit protection. The output is regulated at 12 V when the supply voltage is between 12.5 V and 27 V.
A CMOS compatible, level-dependent, digital input can be used for PWM control of the LED brightness. VO is turned on when the PWM input is high and turned off when the input is low. The AD8240 is designed to work with a PWM frequency up to 500 Hz, and a typical PWM range from 5% to 95%.
Open LED detection is accomplished by measuring the change in LED lamp current caused by an open LED(s) through the use of an internal high-side current-sense amplifier that amplifies the voltage across an external current shunt. The voltage across the shunt resistor is amplified to a level that can be measured by a microcontroller A/D converter or a comparator. The ability to measure the change in LED lamp current is the key benefit of constant-voltage LED lamp driving.
The output is current-limited by latching off the output voltage when the current reaches a preset level. The current limit is set by selecting the value of the external current shunt that causes the output of the sense amplifier to slightly exceed the 5 V reference level when the current exceeds a maximum level. When the sense amplifier output exceeds 5 V, it trips an internal comparator that causes the driver to latch off the output voltage. The latch is reset during the next PWM cycle. The overcurrent condition can also be detected by a microcontroller or external comparator by measuring the sense amplifier output.
| Part# | Input Voltage Range (Vcc) | Supply Current | Efficency (%) | Base Drive (mA) | Frequency Range | LED # | Shutdown | Dimming Control | Package | Price* (1000-4999) |
|---|---|---|---|---|---|---|---|---|---|---|
| AD8240 | 9 to 27V | 0.36mA | n/a | 250 | DC to 500 Hz | 1 | X | PWM | 8-MSOP | $1.29 |
* The pricing listed here is provided only for budgetary purposes as recommended list price in U.S.
Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 | 报价* (100-499) |
报价* (1000 pcs.) |
生产供货情况** | 符合ROHS规定 | 查看PCN | 样片车 | 购物车 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| AD8240YRM | 最后订购时间 | 8 ld MSOP | 8 | 汽车级 | $ 1.44 | $ 1.35 | 01/22/2010 | N 材料声明 | - | 联络ADI | 添加到购物车 |
| AD8240YRM-REEL | 最后订购时间 | 8 ld MSOP | 8 | 工业 | - | $ 1.35 | 01/22/2010 | N 材料声明 | - | 联络ADI | 添加到购物车 |
| AD8240YRM-REEL7 | 最后订购时间 | 8 ld MSOP | 8 | 工业 | - | $ 1.35 | 01/22/2010 | N 材料声明 | - | 联络ADI | 添加到购物车 |
| AD8240YRMZ | 量产 | 8 ld MSOP | 8 | 汽车级 | $ 1.38 | $ 1.29 | 11/13/2009 | Y 材料声明 | - | 联络ADI | 添加到购物车 |
| AD8240YRMZ-R7 | 量产 | 8 ld MSOP | 8 | 工业 | $ | $ 1.29 | 01/22/2010 | Y 材料声明 | - | 联络ADI | 添加到购物车 |
| AD8240YRMZ-RL | 量产 | 8 ld MSOP | 8 | 工业 | $ | $ 1.29 | 01/22/2010 | Y 材料声明 | - | 联络ADI | 添加到购物车 |
*这里所列出的美国报价单仅供预算参考，指美元报价（规定订量的每片美元，美国离岸价），如有修改不再另行通知。由于地区关税、商业税、汇率及手续费原因，国际报价可能不同。对于特殊批量报价，请与您当地的ADI公司办事处或代理商联络。对于评估板和套件的报价是指一个单位价格。
**样片供货情况可能好于生产供货，请将样片放入购物车，以查看样片供货情况。
Close