Datasheet for AD8240YRMZ:
- Manufacturer Part Number : AD8240YRMZ
- Manufacturer : AD
- Description : LED Driver/Monitor IC
- Series : AD8240
- Reference Price : USD 1.032
- Our Price : We have a better price, contact us by email
- Product Type : LED Driver IC
- Function : Step-Down (Buck) LED Drivers
- Current Suggest : Production
- Status : Production
- ROHS Status : ROHS Compliant (Lead Free)
- Package Type : 8-Lead MSOP
- Pins : 8
- MFG Package Case : RM-8
- Part Type : OTH
- Standard Packing Type : Tube
- Standard Packing Quantity : 50
- Working Temperature : -40 to 125C
- Other Part Number : AD8240YRMZ
- Shipping methods : DHL FEDEX UPS TNT
- Delivery Time : Ship within 1 day.
- Manufacturer Production time : 6-8 weeks (Normally have stocks)
- Weight : 0.001KG
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- PWM input for LED Brightness Control
- Open LED Detection
- Latch-off Overcurrent Protection
- Constant Voltage Regulated Output
- Regulated Voltage Range: 12.5V to 27V
- Supply range: 9V to 27 V
- Operating current: 300 µA
- Shutdown current: 10 µA
- Temperature range -40°C to +125°C
- 8-lead MSOP package
A CMOS compatible, level-dependent, digital input can be used for PWM control of the LED brightness. VO is turned on whenthe 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 changein LED lamp current caused by an open LED(s) through the useof an internal high-side current-sense amplifier that amplifiesthe voltage across an external current shunt. The voltage acrossthe 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.
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.