IR21571S

Series:	--
Packaging:	Tube
Part Status:	Obsolete
Type:	Ballast Controller
Frequency:	45.5kHz ~ 50.5kHz
Voltage - Supply:	10.5 V ~ 16.5 V
Current - Supply:	5.5mA
Current - Output Source/Sink:	--
Dimming:	No
Operating Temperature:	-40°C ~ 125°C
Mounting Type:	Surface Mount
Package / Case:	16-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	16-SOIC
Base Part Number:	IR21571S

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Introduction

IR21571S is a high-performance ballast controller designed to control AC or DC ballasts in lighting applications. The IR21571S integrates dual-mode AC/DC ballast control with a three-channel PWM dimming capability, allowing for multiple dimming options for different applications. The IR21571S also includes a power MOSFET switch for load current control and a high- side rectifier for maximum energy efficiency. In addition, the IR21571S includes a comprehensive set of protection features, such as load current detection, load current limitation, and EMI/RFI filtering. These features ensure consistent, safe, and reliable operation of lighting ballasts.

Application Field

The IR21571S is designed for applications where power and accuracy matter, such as lighting and ballast control applications. It is suitable for controlling fluorescent lamps, metal halide lamps, induction lamps, high-pressure sodium lamps, and other types of lighting ballasts. The IR21571S is also suitable for use in LED lighting systems. It can be used to control LED drivers up to 20A and LED modules up to 50A. It offers dimming capabilities that can be used to adjust brightness and create attractive lighting effects.

Working Principle

The IR21571S ballast controller works by regulating the current flowing from the mains to the lighting ballast. This is done by controlling the power MOSFETs in the device. The power MOSFETs switch the load current between the DC bus and the mains AC current. The controller then modulates the switching frequency to control the amount of energy going to the ballast. This allows for control of the light level, power consumption, and lighting effects.The IR21571S uses a three-channel PWM dimming system. The three PWM channels are connected to the MOSFETs, which allow for multiple dimming options. The controller can be programmed to adjust duty cycles to provide different dimming effects. The duty cycles can be vary in time and amplitude to give a corresponding change in light output.

Protection Features

The IR21571S is designed to provide a wide range of protection features to ensure reliable operation and maximize system lifetime. It is designed with over-current and over-voltage protection to protect both the ballast and lighting device from damage due to excessive current or voltage. It also provides short-circuit protection to prevent the ballast from being damaged due to an overload situation. Additionally, the controller includes an EMC filter that minimizes radiation and interference from the device, allowing for accurate operation in even the most challenging EMC environments.

Conclusion

The IR21571S ballast controller is an ideal choice for lighting and ballast control applications. It has a wide range of features that make it suitable for a variety of applications. It offers high power efficiency, high performance, and reliable operation. The controller also includes a set of protection features to ensure safe and consistent operation. With its comprehensive features, the IR21571S is an excellent choice for light and ballast control applications.

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