STR3A155D

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STR3A155D is a low‐voltage, high‐performance current‐mode pulse width modulation (PWM) switcher. It is widely used in offline switcher applications, such as personal computers, telecom adapters, LCD displays, and other power converter applications. In particular, it is well-suited for applications having limited thermal solutions or width noise immunity issues.

The STR3A155D provides a wide range of operating modes, including current‐mode up to 55kHz and 100kHz for high‐frequency applications. It has adjustable frequency and phase shift, adjustable pulse peak current, and adjustable PWM ripple factor, making it an ideal choice for a wide range of offline switcher designs. Its adjustable dead time control enables excellent crossover distortion, while providing precise control of device turn‐on/off times and peak−to−peak ripple.

STR3A155D\'s working principle is based on the principle of pulse width modulation (PWM). This is a form of power switching in which the power delivered to a load is controlled proportionally to the pulse width. The device provides an adjustable control signal that increases or decreases the pulse width, proportional to a load current or voltage value. The result is a precise control of power delivery, with a very fast response time.

In pulse width modulation (PWM) control, a voltage reference signal is fed to the internal PWM comparator, which compares the reference signal with a clock signal provided by the internal oscillator. When the clock signal is greater than the reference signal, the PWM output will be high; when the clock signal is lower than the reference signal, the output signal will be low. The duty cycle of the output signal is regulated by the reference signal. This regulation can be adapted to match various load conditions and ambient temperatures.

The STR3A155D utilizes a patented Peak Discharge Mode Control circuit that further enhances the dynamic range of the device and aids in noise immunity during light load conditions. This circuit also eliminates the need for an additional capacitor and eliminates the need for frequent calibration. In Freewheel Mode, the device is able to deliver equivalent low−noise and high−frequency operation at far lighter loads than competing devices, making it the ideal solution for low power supplies.

The STR3A155D has integrated input protection circuitry. The device includes to protect against over-voltage, under-voltage, and over-temperature conditions, which can be set independently for the primary and secondary outputs. The device also features several package options, with active−low Enable/Reset, Anti−Fuse, and low current standby modes.

The STR3A155D\'s Thermal Shutdown and Over Voltage Shutdown protect the device against thermal events and overvoltage conditions, respectively. Thermal Shutdown protects the device against high temperature conditions while Over Voltage Shutdown helps to prevent damage to the device and the system due to excessive voltage input. The Over Voltage Shutdown feature is driven by a voltage reference that is programmed by external resistors.

Overall, the STR3A155D is an ideal choice for a wide range of PMIC - AC DC Converters and Offline Switchers, providing effective performance and robust protection against over-voltage, under-voltage, and over-temperature conditions. Its adjustable frequency and phase shift, adjustable pulse peak current, and adjustable PWM ripple factor, provide precise control of power delivery and a fast response time.

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