Renesas LED headlight driver IC integrates multiple functions
The main features of the μPD168891 are an integrated current-control function for constant-current drive of LEDs as well as a pre-driver function for driving external metal-oxide-semiconductor field-effect transistors (MOSFETs); integrated protection functions essential for automotive applications, including LED current and external MOSFET overcurrent protection; and a newly developed compact package with low thermal resistance. The device can be combined with other electronic components, such as MOSFETs, Schottky diodes, and choke coils, to build electronic-control units driving automotive headlights.
According to Reneas, the μPD168891 provides constant-current drive control for up to 12 power LEDs connected in a series. The voltage boost switching frequency can be set to a maximum of 500 kHz, a rate slightly lower than the AM radio frequency band to prevent interference with the car audio system. LED drive is supported for power-supply voltages ranging from 6 to 28V. An integrated pre-driver circuit can drive two power MOSFETs used for voltage boost drive and current line cutoff when protection functions are enabled.
The device also incorporates several protection functions including overcurrent protection for the LED current and external MOSFETs, over voltage/load (LED) open protection, LED pin short-circuit protection and overheating protection.
A diagnostic function provides information on the device state when a protection function is triggered, and a shutoff function controls external power MOSFETs to disable current lines. These functions enable a higher-level unit, such as a body control module, to monitor the device and prevent secondary problems due to continuing current flow.
To reduce heat generation and board dimensions, the μPD168891 control IC utilizes a newly designed compact package (48-pin VQFN, 7×7 mm, lead-free) with low thermal resistance, making it possible to design automotive control units that are more compact and lightweight.
Samples of Renesas Electronics' new μPD168891 control IC are currently available. Mass production is scheduled for the first half of FY2012.
For more detailed information, please visit http://www.renesas.com/press/news/news20101006_s.html
- LED family offers greater design freedom for automotive lighting
- Is head-up display future ADAS screen?
- Motor pre-driver chip meets ASIL-D
- Auto chip market: upheaval ahead
- Isolated gate driver operates at up to 225°C
- Opel develops headlight control through eye-tracking
- Opinion: What the NXP/Freescale takeover means for automotive electronics
- Green Hills to support Renesas' R-Car E2 devices
- Altium offers automotive designers a Tasking C compiler update for Renesas RH850
- MCUs target automotive instrument clusters, shape head-up display projections
- Driver chip reduces LED taillight complexity
- Renesas RH850 dev kit gets upgrade
- Multi-sensor application dev tool helps driver assistance systems
- Spread Spectrum Frequency Modulation Reduces Automotive LED Driver EMI
- Infineon takes the lead in auto semiconductors
- MOST – a gigabit data backbone for future car generations?
- Delphi selected to build Audi’s autopilot computer
- Is head-up display future ADAS screen?
- Automotive lighting design software models perception by human eye
- Automotive chip reliability: A matter of design methods
- How will deep learning change SoCs?
- Multi-function integrated FET switch replaces automotive relays
- Magneti Marelli revs up F1, motorcycle racing
- Study: Automotive industry leads digital revolution
- MINI giving drivers a peek at 'augmented reality'
- The car's the star...
- Electric vehicles: Driving range decides
- MOSTCO demos integration of MOST bus with Autosar
- Rare earth magnets still optimum choice, says motor design expert
- KIT, Schaeffler optimise power steering for electric cars
- Intel helps to Turbocharge Infotainment Systems Designs
- Making cars safer through technology innovation
- Supplying DC input power for HEV testing
- NSR Noise Suppressors: Wirewound Resistors
- Virtual Hardware “In-the-Loop”: Earlier Testing for Automotive Applications
- Open Standards and Product Differentiation