TPS61196PWPR

The TPS61196PWPR is a high-performance, high-efficiency, and average-current non-isolated power stage controller intended for use in DC, AC/DC, and boost applications. The TPS61196PWPR features programmable current-sensing inputs, ultra-low power-on reset, and requires no external components. It is suitable for LED drivers applications such as streetlights, retail fixtures, landscape lighting and so on.

Features of TPS61196PWPR

The feature of TPS61196PWPR includes:

• Integrated average current sensing
• Integrated low power current-mode PWM converter
• Wide gain bandwidth product loop compensation
• Maximum supply VCC of 30 V
• 256:1 adjustable current range
• 4.5 V current input voltage
• No external components required
• External timing control

Application Field

The application field of TPS61196PWPR includes LED drivers such as streetlights, retail fixtures, landscape lighting, LED wall washes and LED signboards.

Working Principle of TPS61196PWPR

The TPS61196PWPR can be divided into mainly two working principle, current limit mode and constant frequency current control.

Current Limit Mode

In the current limit mode, after the input voltage reaches the operating voltage level above the startup threshold, the TPS61196PWPR starts the control loop. The input voltage is compared to the feedback voltage. If the input voltage is greater than the feedback voltage then the output switching process is started. The current limit function monitors the input current through the peak current limit resistor which can set the upper limit for the output current. The peak current limit current can be externally adjusted according to the requirement.

Constant Frequency Current Control

The constant frequency current control is used when the input voltage is greater than the start up voltage. The oscillator generates a constant frequency which drives the switch MOSFETs. The output current is regulated by controlling the duty cycle of the switching transistors, which is determined by the voltage difference between the feedback voltage and the sensed current voltage.

Conclusion

The TPS61196PWPR is a high performance and wide input voltage range, average current non-isolated controller that can be used in LED drivers applications. Due to its high efficiency and wide range of features, it is a popular choice for lighting applications such as streetlights, retail fixtures and landscape lighting.