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Renesas Electronics Introduces New Control IC for Automotive LED HeadlightsDUSSELDORF, Germany, October 6, 2010 — Renesas Electronics Corporation (TSE: 6723), a premier provider of advanced semiconductor solutions, today announced the availability of its new control IC (part number µPD168891) for automotive light emitting diode (LED) headlights.The main features of the µPD168891 IC are (1) an integrated current-control
function for constant-current drive of LEDs and a pre-driver function for
driving external metal-oxide-semiconductor field-effect transistors (MOSFETs);
(2) integrated protection functions essential for automotive applications,
including LED current and external MOSFET overcurrent protection; and (3) a
newly developed compact package with low thermal resistance. The new device can
be combined with other devices, such as MOSFETs, Schottky diodes, and choke
coils, to build electronic-control units for driving LED headlights such as
automotive headlights.
The µPD168891 device is designed to satisfy the requirements of automotive
headlight applications by integrating functions required for LED constant
current drive as well as other functions.
Main functions of the control IC are as follows:
- Integration of functions specifically for automotive LED headlight
applications
The µPD168891 device can provide 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 kilohertz (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 volts (V) to 28V.
An integrated pre-driver circuit can drive two power MOSFETs used for voltage
boost drive and current line cutoff in case of protection works.
- Integration of multiple protection functions
The µPD168891 device 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 can output information on the device state when a
protection function is triggered by a malfunction 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 state
of the electronic-control unit and prevent secondary problems due to
continuing current flow.
- Newly developed compact VQFN package with low thermal resistance
To reduce heat generation and board dimensions, the µPD168891 control IC
utilizes a newly designed compact package (48-pin VQFN, 7 millimeters (mm) × 7
mm, lead-free) with low thermal resistance, making it possible to build
automotive control units that are more compact and lightweight.
Availability
- Samples of Renesas Electronics' new µPD168891 control IC are currently
available. Mass production is scheduled for the first half of FY2012.
more info:
RENESAS Electronic
201010132111.11.2010AutomotiveRENESAS
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