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BD9423EFV-E2 Application Field and Working Principle

BD9423EFV, Japanese semiconductor company ROHM\'s LED driver IC, is usually used in the audio system. This IC is designed to drive an LED display in a portable device. It uses a highly integrated MOSFET driver, which supports a wide range of LED voltages and currents.

The BD9423EFV is designed for applications such as LED displays for TVs, notebooks, and car audio systems. It provides a superior output accuracy and a wide drive range of up to 25mA. This LED driver IC has a maximum output current of 25mA, and a maximum voltage of 5V.

Working Principle

The BD9423EFV is a single channel LED driver IC. It uses a two-stage configuration to drive the LED in different cases with different forward voltage and current settings. The current settings are adjustable by changing the voltage on the MOSFET and the Control Gate, and the forward voltage is adjusted by changing the output voltage of the internal PWM generator.

The IC has an integrated delay circuit, so that the LED can be controlled smoothly and accurately in different settings. The delay circuit is also used to protect the MOSFET and Control Gate from overvoltages and short-circuits.

The BD9423EFV has two channels of MOSFETs, each with its own Control Gate. The two MOSFETs are configured in parallel with a resistor in series between them. This reduces the overall bias current, so that it can be driven in a wide range of forward voltages and currents.

The BD9423EFV also includes a temperature protection circuit. This protects the IC from damage due to excessive heat, and prevents the LED from being overdriven in high temperatures.

Features

The BD9423EFV has the following features:

• Integrated PWM generator
• Delay circuit for LED control
• Wide drive range of up to 25mA
• Temperature protection circuit
• Two channels of MOSFETs for forward voltage and current settings

In addition, the BD9423EFV is pin-compatible with other ROHM LED driver ICs, such as the BD9262EFV and BD9263EFV. This means that it can be used in many different designs.

Conclusion

The BD9423EFV is a highly integrated single channel LED driver IC, designed for applications such as LED displays for TVs, notebooks, and car audio systems. It provides a superior output accuracy and a wide drive range of up to 25mA. Its features include an integrated PWM generator, a delay circuit for LED control, and a temperature protection circuit. The BD9423EFV is pin-compatible with other ROHM LED driver ICs, and can thus be used in many different designs.

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