Arrow Plastic 3M Network Card - Manual (Page 24)

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24
POWER AND LINEAR IC
SOLUTIONS
LEDs and LED displays suffer varying illumination levels as
the power supply voltage changes. This affects displays
used in automotive applications, battery operated handheld
devices or fixed architectural installations.
To keep LED brightness constant needs a stable current over the
anticipated variation in power supply voltage. The usual method
of a resistor in series with the LEDs has serious drawbacks: the
resistor must present a large near-infinite resistance but this
produces a large voltage drop across it. Additional parallel resistors
are necessary to drive a given number of LEDs, increasing current
consumption. Secondly, series resistors waste power as heat.
Infineon’s LED driver family overcomes all the drawbacks and
offers an easy, cost effective and reliable way to achieve LED
current stabilisation. The BCR 401R, BCR 402R, BCR 402U and
BCR 405U cover the most common LED supply current ranges,
10mA, 20mA and 50mA and enable easy adjustment upwards
from the nominal driver current value by adding a single external
resistor. Voltage drop with these ICs is only 0.75V, maximising DC
efficiency. A negative temperature coefficient protects LEDs against
thermal runaway. The ICs are small, in surface mounted SOT143R
packages.
For applications requiring even higher LED currents, Infineon offers
powerful linear and DC/DC switched constant-current drivers. The
TLE 424x linear LED driver family consists of three different drivers
covering a current range from 60mA (TLE 4240-3) to 500mA (TLE
4242G). All parts have on-chip diagnostics and comprehensive
protection mechanisms. Maximum permissible input voltage is
45V, making this part attractive also for higher board voltages (for
trucks, tractors etc.). All parts are ROHS compliant and available in
the full automotive temperature range, -40°C to +150°C.
High brightness LEDs with currents exceeding the 500mA limit can
be driven with Infineon’s DC/DC switched constant-current LED
drivers, offering solutions up to 2.3A continuous current. In terms
of highest input voltage and output current, the TLE 6389-2GV is
an excellent choice with 60V maximum input voltage and 2.3A
maximum output current. This part combines high output voltage
accuracy with special features like reset circuitry and battery low
detector.
In terms of highest integration and small package solutions,
Infineon is also offering a 1.8A DC/DC switching regulator in
a PG-SO8 package. The TLE8366-GV incorporates the control
IC, power switch and protection circuitry. Moreover only five or
six additional external parts are necessary to realise a switched
regulator.
Features
U
BCR 401R
- Low cost
- Few external parts
- Easy to use and fast
- Small SOT143R packaging (2.9mm x 1.6mm x 1.1mm
incl. leads)
U TLE 4240-3GM
- Low cost, automotive qualified
- 60mA
- Protected against short circuit to GND or Vbat, reverse
polarity, overtemperature
- SCT-595 package
U TLE 4241GM
- Adjustable output current up to 70mA
- Protected against short circuit, reverse polarity,
overtemperature
- Open load detection/diagnosis
- PG-SO8 package, automotive qualified
U TLE 4242G
- Up to 500mA output current, adjustable
- Comprehensive protection features
- PWM logic level input
- Status/diagnostic output
- D2PAK package, automotive qualified
U TLE 8366EV
- Up to 1.8A adjustable output current
- Efficient DC/DC switching regulator with 370kHz
switching frequency
- Integrated power stage, soft start, synchronisation input
- PG-SO8 package, fully automotive qualified
U TLE 6389-2GV
- Up to 2.3A adjustable output current with high accuracy
of ±3%
- 60V maximum input voltage
- Driver output for external power switch
- PWM input, reset generator, sync input and low
battery detector
- PG-DSO14 package, fully automotive qualified
Comprehensive range of solutions meets the evolving requirements of lighting applications
Efficient, Intelligent Solutions for
LED Lighting Applications
ENQUIRY 1468
Infineon
LED Sample
Kit and
LED Driver
Brochure
available!