STR-A6069H

Duty Cycle:	83%
Mounting Type:	Through Hole
Supplier Device Package:	8-DIP
Package / Case:	8-DIP (0.300", 7.62mm), 7 Leads
Operating Temperature:	-20°C ~ 125°C (TA)
Control Features:	--
Fault Protection:	Current Limiting, Over Load, Over Temperature, Over Voltage
Power (Watts):	30W
Frequency - Switching:	100kHz
Series:	STR-A6000
Voltage - Supply (Vcc/Vdd):	8.1 V ~ 32 V
Voltage - Start Up:	15.3V
Topology:	Flyback
Voltage - Breakdown:	700V
Internal Switch(s):	Yes
Output Isolation:	Isolated
Part Status:	Active
Packaging:	Tube

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STR-A6069H Application Field and Working Principle

The STR-A6069H is part of the PMIC – AC DC Converters, Offline Switchers. It is a pulse-width modulation (PWM) controller integrated IC designed for offline switching power converters. Also called flyback converters, these systems are ideal for powering a wide range of applications, including point-of-load (POL) DC-DC converters and offline AC-DC adapters. The STR-A6069H has a wide range of applications and includes many features that make it an ideal choice for those applications requiring an economical yet efficient solution.

Features

The STR-A6069H is a highly integrated and efficient solution for offline switching power converters. It includes an operational amplifier, a reset comparator, a thermal shutdown circuit, a current-sense and feedback reference amplifier, a pulse-width modulator, an undervoltage lockout (UVLO) control circuit, and a power switch control circuit. These features provide the necessary protection and control to create high efficiency switching power converters. In addition, the STR-A6069H offers a range of Adaptive On-Time (AOT) characteristics in order to accommodate a variety of AC/DC current or power supply topologies.

Working Principle

The STR-A6069H is designed to operate in a flyback topology, such that the energy stored in the main winding of the transformer is recycled to the output capacitor when the power switch turns off. The power switch is controlled externally through the power switch control circuit of the STR-A6069H. The pulse-width modulation (PWM) signal generated by the STR-A6069H is then used to saturate the power switch. The on-time of the power switch is determined by the comparative outputs of two specific circuits: the voltage loop and the current loop.The voltage loop is responsible for maintaining the output voltage, while the current loop is responsible for limiting the maximum output current. When the output voltage falls below the reference voltage, the voltage loop turns on the power switch. When the maximum current limit is reached, the current loop turns off the power switch. The pulse-width modulation signal generated from these two loops is combined with the internal oscillator signal to ensure that the peak of the power switch carrier wave coincides with the peak of the modulation signal. This control technique is called Adaptive On-Time control and ensures that the power switch passes through its on-time range efficiently.

Performance

The STR-A6069H is designed to provide maximum efficiency and high performance operation in its applications. The unique adaptive on-time control method ensures that the power switch passes through its on-time range efficiently, reducing switching losses and power dissipation. Additionally, the device features a protection system that prevents excessive stress on the power switch, thereby protecting its user from over-temperature and over-current conditions. Efficiency is further enhanced by various features such as the low-ripple current waveform, input voltage ripple compensation, thermal shut-down, and hysteretic current sensing.The STR-A6069H automatically adjusts the control loop parameters to optimize current regulation, thus relying on minimal combined design complexity. This makes the IC an ideal choice for high efficiency applications, where space is limited. To further optimize the efficiency and performance of the design, the STR-A6069H includes many programmable parameters that allow the user to fine-tune the performance.

Conclusion

The STR-A6069H is a highly integrated and efficient solution for offline switching power converters. It is part of the PMIC – AC DC converters, Offline Switchers and provides state of the art features such as adaptive on-time control and a protection circuit. The STR-A6069H also includes programmable parameters to fine-tune the performance, and thus is an ideal choice for designers looking for an economical yet efficient power supply solution.

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