SI9120DJ-E3

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The SI9120DJ-E3 is a popular off-line buck LED driver IC that integrates a current-mode PWM controller, a high-side MOSFET, and a driver MOSFET into a single package. It’s an ideal choice for cost-sensitive, space-constrained LED lamps and driver applications.

Application Field

The SI9120DJ-E3 is designed for portable LED lamp, off-line LED driver, LED dimmer, and LED bulb applications, to drive LEDs in constant-current and power efficient way. It features Dimming Signals (Gen. 2, DCMB-1, DCRC, i2C) and High Efficiency that make it well suited to the needs of LED or OLED lighting. It accepts a wide input voltage range (85VAC-265VAC) which eliminates the need of external components like fuses and MOVs or snubber circuits.

Working Principle

The chip features a voltage feedback topology (VFB) based on peak current-mode control with two feedback pins (FB1 and FB2) for the voltage loop and voltage-compensation loop. A 200mV voltage differential is created between the voltage at FB1 and FB2 pins. The chip contains an internal 500mV reference. The FB1/FB2 voltage differential is compared to the internal reference voltage to regulate the drive to the optics via the PWM cycle. The internal constant-current reference is determined by the EN/DIM pin and can be programmed between 10mV and 100mV.

The SI9120DJ-E3 provides very low quiescent current in Burst Mode operation, one of the many features that make it an attractive choice for cost-sensitive, space-constrained applications. The electronic dimming can be utilised for optimized light output, improved dimming range and greater system efficiency.

The SI9120DJ-E3 also provides a cycle-by-cycle current limit feature as a protective function. If an over-current event occurs, the switch will be turned off until the current returns to a safe level. The device also has short-circuit protection, which will detect a short circuit condition and prevent it from damaging the IC.

Features and Benefits

• Wide Input Voltage Range: The SI9120DJ-E3 can handle a wide input voltage range of 85Vac-265Vac, eliminating the need for external components such as fuses and snubber circuits.
• High Efficiency: The chip has a maximum efficiency of up to 95%, and it is suitable for portable LED lamp, off-line LED driver, LED dimmer, and LED bulb applications.
• Cycle-by-Cycle Current Limit: It has a cycle-by-cycle current limit feature as a protective function. If an over-current event occurs, the switch will be turned off until the current returns to a safe level.
• Electronic Dimming: The electronic dimming can be utilised for optimized light output, improved dimming range and greater system efficiency.
• Integrated Gate Drive: It integrates Strong Gate Drivers and MOSFETs optimized for high frequency switching, allowing the device to operate at frequencies greater than 200kHz.

Conclusion

The SI9120DJ-E3 is a powerful and cost-effective solution for LED applications such as LED lamps, LED dimmers and LED bulbs. It offers dimming functions, high efficiency and wide input voltage range, with short-circuit and cycle-by-cycle current limit protection. It is ideal for cost-sensitive, space-constrained LED lighting applications.

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