Bipolar Power LED Controller IC

Features:

• Bipolar power technology
• Voltage drop across sense resistor only 0.1...0.2 V
• Maximum operating voltage: 27 V
• Over voltage protection
• Temperature shut down mechanism
• Extremely precise bandgap voltage reference
• Low shut down current < 50 nA in operating voltage range
• Maximum operating output current: 85 mA
• Maximum LED current of 2.5 A possible by using external power transistors
• Digital On/Off switch
• PWM control for LED brightness possible
• Minimum external component required (sense resistor)
• Small package: 2.9 mm x 2.5 mm x 1.1 mm (TSOP6 / SC74)


Applications:

• LED controller for industrial applications, not qualified for automotive applications
• Universal constant current source
• General illumination e.g. retrofit
• Residential architectural and industrial commercial lighting for in- and outdoor
• Signal and marker lights for orientation or navigation

Description:

The BCR450 is a low cost LED controller IC for industrial applications realized in a bipolar IC technology. The LED Controller is capable to drive high current, high brightness LEDs up to 2.5 A by using additional external output stages as “booster“ transistors. For LED currents up to 85 mA the IC can be used as a stand alone device and requires only one voltage sense resistor as an external component The current supply uses a sense control function with feedback mechanism that regulates the LED current.
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.
Furthermore, over voltage protection and temperature shut down mechanism enforce the IC to protect attached LEDs.(e.g. steps, exit ways, etc.)