BD7757MWX-E2 Integrated Circuits (ICs)

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PMIC, or power management integrated circuits, are chips that are used to regulate voltage from incoming power and protect circuits from too high or too low voltages. In the application field of LED drivers, PMICs are used to power LED light fixtures. The BD7757MWX-E2 is a power management integrated circuit specifically designed for driving multiple high-power white LEDs in series or parallel. By combining a built-in DC-DC step up/down converter and MOSFET circuit, it supplies stable current to LEDs and protects against overcurrent, overvoltage, or static electricity.

Features

The BD7757MWX-E2 uses two MOSFETs in a “half-bridge circuit” to drive LEDs. The half-bridge circuit enables the BD7757MWX-E2 to achieve a higher output current than traditional driving methods. It also reduces the size of the whole driver and provides a better heat dissipation. The BD7757MWX-E2 integrates a voltage input range of 9V to 32V, and the output current can range from 350mA to 1A. It also has a built-in fault detection and protection circuit that will turn off the LEDs when the output voltage reaches 12V or when there is an overcurrent or overheating. It also has an adjustable soft-start time, which can be set from 0.5 seconds to 4 seconds. Additionally, the BD7757MWX-E2 supports a wide range of dimming methods, including PWM and analog dimming.

Application Field

Because of its high-power output and multiple protection functions, the BD7757MWX-E2 is suitable for many types of LED drivers. For indoor use, the BD7757MWX-E2 can be used in general lighting and panel lighting, including spotlights, downlights, track lights, panel lights, and more. In outdoor scenarios, it can be used in street lights, façade lighting, and garden lighting. The BD7757MWX-E2 can also be used in other similar applications, such as automotive and aerospace.

Working Principle

The BD7757MWX-E2 follows a control method known as pulse-width modulation (PWM). This technique uses ON and OFF cycles to control the power delivered to an LED. When the PWM signal is on, the BD7757MWX-E2 will allow current to flow through the LEDs, resulting in a light output. When the signal is off, the current is blocked and the LEDs are turned off. The frequency and duration of the on and off cycles can be adjusted to control the brightness of the LEDs.

To regulate the output current for each LED, the BD7757MWX-E2 uses a constant current output circuit. This circuit consists of an error amplifier, an error detector, a PWM comparator, and a voltage regulator, which are all connected together to form a feedback loop. The error amplifier compares a reference voltage to the output voltage of the LED, and if the output voltage is too low, the error amplifier will increase the voltage, causing a higher output current. Once the output voltage is correct, the error amplifier will reduce the voltage, thus decreasing the output current. This constant current regulation helps maintain the stability of the output current for each LED.

Conclusion

The BD7757MWX-E2 is a power management integrated circuit specifically designed for driving multiple high-power white LEDs in series or parallel. It integrates a DC-DC step up/down converter, two MOSFETs in a half-bridge circuit, and a fault detection and protection circuit to provide stable, reliable output current and a wide range of dimming methods. The BD7757MWX-E2 is suitable for a wide range of LED drivers, including indoor and outdoor applications.

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