Overview
The FL5150MX, produced by onsemi, is a controller designed for varying the pulse width for AC loads, specifically tailored for 50 Hz applications. This device is part of the FL5150/60 series, which includes the FL5160 for 60 Hz applications. The FL5150MX is powered directly from the AC line and generates a programmable gate drive to control the pulse width for external IGBT or MOSFET transistors. It offers user-programmable dimming control, over-current and temperature protection, and supports both trailing and leading edge dimming. The device is particularly useful in LED lighting applications, providing smooth dimming transitions and compliance with relevant safety standards such as UL1472 for flicker reduction.
Key Specifications
| Parameter | Value |
|---|---|
| Operating Frequency | 50 Hz |
| Package Type | 10-pin SOIC |
| Operating Temperature Range | -40°C to +85°C |
| Quiescent Current | 600 µA (typical at VS to GND = 12 V) |
| Pulse Width Control | 0 to 100% duty cycle |
| Dimming Pulse Widths | 226 selectable widths with 25 µs resolution |
| Dimming Mode | Trailing edge and leading edge dimming |
| Over-Current Protection | User programmable with external sense resistors |
| Temperature Protection | User programmable |
| Internal Regulators | 17 V shunt regulator, 5 V linear regulator |
Key Features
- Selectable earth ground or line-hot zero-cross detection for flicker reduction
- User-programmable leading or trailing edge dimming control
- Dynamic over-current and temperature protection
- Powered from the AC line with symmetric AC current control
- IGBT or MOSFET gate driver with programmable gate pulse width
- 8-bit ADC input for dimming control with adjustable resistor or 0 to 10 V DC voltage
- Smooth dimming transition with built-in ramp up/down control
- Low power electronic off state mode reducing power consumption to less than 100 mW
- Compact 10-pin SOIC package for low-cost design
Applications
- LED Lighting – High Power, Mid Power, Low Power with phase-cut dimming
- Dimmer Switches
- AC Controls
- General Lighting applications requiring phase-cut dimming
Q & A
- What is the operating frequency of the FL5150MX?
The FL5150MX operates at 50 Hz. - What type of package does the FL5150MX come in?
The FL5150MX comes in a 10-pin SOIC package. - What is the operating temperature range of the FL5150MX?
The operating temperature range is -40°C to +85°C. - How is the pulse width controlled in the FL5150MX?
The pulse width can be controlled from 0 to 100% duty cycle using an external resistor, 0 to 10 V DC signal, or a logic signal from a microprocessor. - What types of dimming does the FL5150MX support?
The FL5150MX supports both trailing edge and leading edge dimming. - How does the FL5150MX protect against over-current and temperature?
The FL5150MX has user-programmable over-current and temperature protection using external sense resistors. - What is the quiescent current of the FL5150MX?
The quiescent current is typically 600 µA at VS to GND = 12 V. - How many selectable dimming pulse widths does the FL5150MX offer?
The FL5150MX offers 226 selectable dimming pulse widths with a resolution of 25 µs per step. - What is the purpose of the internal 8-bit ADC in the FL5150MX?
The internal 8-bit ADC allows for dimming control with an adjustable resistor or 0 to 10 V DC voltage. - How does the FL5150MX achieve smooth dimming transitions?
The FL5150MX controls the dim pulse width rate of change to ensure a smooth dim transition with a minimum to maximum dim ramp time of approximately 1 second.
