BD1204GWL-E2

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BD1204GWL-E2 Application Field and Working Principle

BD1204GWL-E2 is an LED driver IC that belongs to the power management integrated circuits (PMIC) - specifically, LED drivers family. It is designed to provide a regulated current output suitable for driving a wide range of power LED applications. This IC is suitable for portable device applications such as mobile phones and digital still cameras.

Features

• Wide output current range from 5 mA to 250 mA
• Low quiescent supply current of 0.9 mA
• Accepts up to 30 VDC input
• Unregulated input voltage suitable for standby mode
• Operating temperature range of -40°C to 85°C
• Supports PWM dimming

Applications

• Mobile handsets
• Digital still cameras
• Portable device applications
• Power LED Flash applications

Working Principle

The BD1204GWL-E2 is a current-mode LED driver that works based on the principle of controlling the LED current with constant current. It operates with a wide input voltage range up to 30 VDC. The LED driver IC is suitable for portable device applications due to its low quiescent supply current at only 0.9 mA, allowing the device to be used in standby mode while providing sufficient protection.

In order to control the output current, the BD1204GWL-E2 utilizes a current sense amplifier to detect the output current. This sense amplifier adjusts the peak current of the internal clock generator accordingly using the control loop. The internal adjustable current control voltage is then applied to a current setting pin of the device. The internal current regulation voltage is caused by the forward voltage differences between the internal resistor and the LEDs.

The BD1204GWL-E2 also features PWM dimming capability, allowing the user to easily adjust the output current by controlling the duty cycle of the PWM signal. This allows the user to adjust the output current to the desired level while maintaining the same voltage across the LEDs, thus reducing power consumption and making the device more energy efficient.

Conclusion

The BD1204GWL-E2 is an LED driver IC that belongs to the PMIC - LED drivers family. It is designed to provide a regulated current output suitable for driving a wide range of power LED applications, suitable for mobile phones, digital still cameras and other portable device applications. In addition, the IC also provides power savings by enabling PWM dimming, and its low quiescent supply current allows it to be used in standby mode.

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