BD8156EFV-E2

Power management integrated circuits (PMICs) are an essential part of modern electronic systems. They act as critical components in the power management chain and provide numerous functions such as voltage and current regulation, power-on reset, and fault management. PMICs are used in many applications and are often tailored to the specific needs of the system they are intended to power. With such a wide range of applications and features, the various types of PMICs can simply be classified according to their intended use in specialized and general applications.

The BD8156EFV-E2 PMIC is a specialized power management IC designed for low voltage LED lighting systems. The device is a high-performance, low-power synchronous boost converter specifically designed for driving LED strings, allowing for simultaneous operation of up to 16 channels. It is highly efficient and supports a wide range of input voltage (4.75V to 36V), output voltage (2V to 40V), and output current (25mA to 54mA) selections. The device also features protection functions such as undervoltage protection, overvoltage protection, thermal protection, and overcurrent protection.

Application Field

The BD8156EFV-E2 is especially well suited for illumination and lighting applications, specifically low voltage lighting systems. These can include automotive lighting, signage lighting, street lighting, and architectural lighting. The BD8156EFV-E2 offers a high level of parametric flexibility, allowing for the optimization of the system design for each particular application. It allows for simultaneous regulation of multiple LED strings and allows for a variable light intensity output.

Working Principle

The BD8156EFV-E2 is a synchronous boost converter device that offers high efficiency and high performance. The device uses two transistors operating in discontinuous conduction mode (DCM) and utilizes a constant off-time (COT) control scheme. The device operates in a two-stage Boost-and-Shift method, with the Boost stage generating the output voltage and the Shift stage controlling the output current. At the beginning of each switching cycle, the Boost stage is turned on, and both the Boost and Shift stages are turned off at the end of each switching cycle. The control cycle is designed to keep the output voltage at a regulated level regardless of the changing LED load or LED number.

The BD8156EFV-E2 uses an integrated output current sensing circuit to control the average current being sourced into the LED strings. The device senses the voltage drop across a sense resistor and converts the signal into a current. This current is then compared to the target current set by a control input, and the device adjusts the output voltage accordingly. This allows for the LED strings to have continuous operation, with a wide range of availablecurrents and output voltages. The device also supports both dimming and fault signal output functions.

Conclusion

The BD8156EFV-E2 is a highly specialized PMIC device that offers a range of features and benefits specifically designed for low voltage LED lighting applications. These include high efficiency and performance, wide input voltage range, high output current capability, and multiple protection features. The device also supports simultaneous regulation of multiple LED strings, allowing for varying light intensities. This makes the BD8156EFV-E2 a good choice for applications ranging from automotive lighting to architectural lighting.