ST1S06APUR Integrated Circuits (ICs)

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The ST1S06APUR is a DC/DC switching regulator featuring high efficiency, low standby current and low ESR output capacitors. It is specifically designed for applications such as display backlighting and LED lighting, providing LED string constant current output with excellent LED efficiency and flicker free output. It is an ideal application as a part of a power supply architectural solution for such applications.

Overview of Features

• High power conversion efficiency up to 95%
• Low standby current consumption of 0.3mA
• Quasi-resonant switching modes for enhanced EMI performance
• PFM/PWM mode selectable
• Soft start and over current protection
• Low-ESR output capacitors for improved load transient response
• Variable current limit up to 500mA
• Integrated over temperature protection (shutdown)
• Output voltage available up to 27V
• Operation up to 1.5MHz switching frequency

Application Field

The ST1S06APUR is well-suited for display backlighting, LED lighting and current LED string applications. It provides LED string constant current output with excellent LED efficiency and low-flicker output. The ST1S06APUR is also suitable for high frequency power supply and telecommunication power applications.

In display backlighting applications, the ST1S06APUR enables superior power efficiency and allows for flexible designs. It also features an EMI friendly quasi-resonant switching mode that minimizes EMI noise. The variable current limitation up to 500mA also allows flexibility in the design of the backlighting output current, depending on the requirements.

In LED lighting applications, the ST1S06APUR is ideal for driving high-power LED strings due to its high efficiency of 95% and low standby current consumption. The low-ESR output capacitors provide improved load transient response and the integrated over temperature protection (shutdown) ensures reliable operation. The ST1S06APUR also has a wide range of output voltage from 0.95V to 25V. This provides flexibility in design, allowing for a wide range of LED strings and supply voltages.

In current LED string applications, the ST1S06APUR meets the stringent requirements for maximum efficiency, low standby current and low noise. The wide operating frequency range from 200KHz to 1.5MHz makes the ST1S06APUR suitable for high frequency power supply and telecommunication power applications.

Working Principle

The ST1S06APUR DC/DC switching regulator works on the principle of pulse width modulation (PWM). The pulse width of the output waveform is modulated according to the incoming voltage and current demand, so that the regulator maintains a constant output voltage and current. The frequency of the output waveform is determined by the internal oscillator, and can be selected from different operating frequency ranges.

The regulator comprises of an internal PWM comparator, an auxiliary error amplifier, a driver circuit and an internal oscillator. The comparator and the error amplifier together form the error signal which is used by the driver circuit to control the switching frequency and pulse width of the output waveform. The oscillator sets the basic frequency for the output waveform and the duty cycle of the switching is modulated so that the feedback voltage is maintained. The output voltage can be adjusted using external resistors and the current limit is adjustable using external capacitors.

The ST1S06APUR also integrates several protection mechanisms such as over current and over temperature protection, which prevents the regulator from damage due to overload or excessive temperature conditions.

Conclusion

The ST1S06APUR DC/DC switching regulator is a highly efficient and low standby current device that is suitable for a wide range of applications such as display backlighting, LED lighting, high frequency power supply and telecommunication power applications. The internal PWM comparator and auxiliary error amplifier enable the regulator to maintain a constant output voltage and current, while the low-ESR output capacitors ensure an improved load transient response. The integrated over current and over temperature protection devices ensure the reliable operation of the regulator even under extreme conditions.

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