BCR450E6327

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Manufacturer: Infineon Technologies

Type: Adjustable constant current source

Output current: 5-150mA (programmable)

Input voltage range: 6V - 45V

Dropout voltage: 1.5V (typical @100mA)

Package type: SOT-89 (E6327)

Operating temperature: -40°C to +150°C

Description

The BCR450 is a LED driver IC optimized for usage with an external power transistor for driving LEDs above 100 mA. For currents up to 85 mA the BCR450 can be used in stand alone operation. The output current level can be adjusted with an external sense resistor. The IC can be switched on and off by an external signal, which is also suitable to regulate brightness of the LEDs by PWM dimming. The precise internal bandgap stabilizes the circuit and provides stable current conditions over temperature range. Additional features are included to protect the LEDs from overload, short circuit events as well as from over voltage. The LEDs can be also protected against thermal overload by thermally coupling the LEDs to the BCR450.

Features

   1. Low voltage drop across sense resistor, 0.15 V typical

   2. High output current precision

   3. Operating voltage fro 8 to 27 V

   4. Over voltage protection

   5. Overtemperature current foldback and Thermal shut down function

   6. Adjustable Constant LED Current up to 85 mA in stand alone operation

   7. Precise Internal bandgap enables High output current accuracy

   8. Up to 2.5 A LED current possible by using external transistor

   9. EN Input for PWM LED brightness control and On/Off control

 10. Very Low Standby Current

 11. Minimum number of external components required, no inductors

 12. Very small SC-74 package: 2.9 mm x 2.5 mm x 1.1 mm

Benefits

   1. High level of colour control due to high output current precision

   2. Small space requirement

   3. No electro- magnetic interference

   4. Active thermal monitoring of chip and LED temperature with current fold- back to avoid thermal overstress

   5. Low cost device

   6. Scalable output stage optimizing cost and space

Typical Applications

   1. General lighting e.g. retrofits

   2. Architectural lighting, Medical and Dental lighting

   3. Transportation like train and aircraft lighting

   4. Strobe lighting

   5. Universal constant current source

   6. Signal and marker lights for orientation or navigation

   7. LED controller for industrial applications, not qualified to AECQ100

Pin configuration (SOT-89)

           ┌───────┐

           │                  │ 

     ADJ│1              3│ VOUT

           │       ▲        │ 

     VIN│2                │ 

           └───────┘

(The top metal sheet is a heat sink)

Typical application circuit

   ┌───────────────┐

   │  12-24V input power supply       │

   └──────┬───────┬──┘

                     │                 │

                [10μF]           [Rset]

                      │                 │

   ┌──────▼───────▼──┐

   │      VIN                              ADJ      │

   │             BCR450E6327              │

   │                  VOUT                   ├─▶ LED array

   └──────┬───────┬──┘

                     │                  │

   ┌──────▼───────▼──┐

   │  GND       heat dissipation copper foil│

   └─────────────────┘

Key points of design

   1. Thermal management:

       - A 30°C/W heat dissipation margin is required for every 100mA

       - PCB copper foil area ≥ 2cm² (1oz copper thickness)

   2. Layout suggestions:

       - Rset should be as close to the ADJ pin as possible (tracking <5mm)

       - Avoid high-temperature components from being close

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