ISL6556BCB-T

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The ISL6556BCB-T is an integrated circuit from Intersil Corporation and a member of the ISL6556 family of Voltage Regulators of the Special Purpose category. It is an offline current-mode LED controller for LED lighting applications. This part provides an adjustable, regulated output voltage with a maximun current bias of 400mA. The LED output current is controlled as a function of remote sense voltage. This device is designed to provide a power supply output current limit function. The ISL6556BCB-T is well suited for applications like LED backlighting, white LED, and notebook power.

Key Features

• Remote Sensing Capabilities.
• VCC Surge Voltage Protection Up To 48V.
• LED Current Up To 400mA.
• Undervoltage Lockout Protects the Load from a Low VCC.
• ±2% Sense Voltage Tolerance.
• High Output Voltage Accuracy.
• Stable With Ceramic Output Capacitor.

Application Fields

The ISL6556BCB-T is used in a variety of fields due to its high output current limits, its surge voltage protection, and its remote sensing capabilities. Commonly, it is used in LED lighting applications like backlighting, white LEDs, and notebooks. It can also be used in 12V and 24V motion control applications, as well as high intensity discharge (HID) lighting systems. Other possible applications include low power AC-DC and DC-DC converters, cable boxes, switch-mode power supplies (SMPS), automotive power electronics, and isolated systems.

Working Principles

The ISL6556BCB-T is a current mode LED controller IC. It is designed to control LED current from relatively low to relatively high current values. It operates in a fixed frequency (approximately 360kHz) current mode control and regulates the LED current through an integrated error amplifier and transconductance amplifier. When the sense voltage at its input is higher than the minimum current level, the IC increases the LED current up to its set maximum limit. The output voltage can be adjusted with a single resistor and the LED current can be set with an external drive voltage. The IC also offers pulse-width modulation (PWM) dimming with an external signal. It operates with supplies ranging from 8V to 42V and can handle up to 48V surge voltage.

Protection Features

The ISL6556BCB-T provides overvoltage protection, thermal cut-off protection, undervoltage lockout (UVLO) protection, and overtemperature protection for enhanced safety. These safety features are enabled by the integrated current-limit and power-limit circuits on the IC. The undervoltage lockout circuit monitors the VCC level and blocks the IC from operating if the VCC falls below a preset level. The overtemperature protection feature shuts down the IC when its temperature gets too high. The thermal cut-off protection circuit limits the external power dissipation to a safe level. The overvoltage protection is enabled by the integrated error amplifier and ensures the LED current is never overdriven.

Conclusion

The ISL6556BCB-T is an integrated circuit from Intersil Corporation and a member of the ISL6556 family of Voltage Regulators of the Special Purpose category. It is an offline current-mode LED controller designed to provide an adjustable, regulated output voltage with a maximum current bias of 400mA. The LED output current is controlled as a function of remote sense voltage. This IC is used in LED lighting applications like backlighting, white LEDs, and notebooks or in 12V and 24V motion control applications, as well as high intensity discharge (HID) lighting systems. The ISL6556BCB-T also offers overvoltage protection, thermal cut-off protection, undervoltage lockout (UVLO) protection, and overtemperature protection for enhanced safety.

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