ISL6308A Three-Phase Buck PWM Controller with High Current Integrated MOSFET Drivers
The ISL6308A is designed to enhance the efficiency and reliability of power management systems. Its three-phase PWM control architecture allows for smooth operation across various load conditions, making it ideal for applications requiring high efficiency and performance. The use of integrated MOSFET drivers minimizes the need for external components, which simplifies the design and reduces the overall footprint of the power management solution.
The programmable output voltage feature, facilitated by the on-chip DAC, allows for flexibility in design, accommodating a range of output requirements with precision. The remote voltage sensing capability ensures that voltage regulation remains accurate even when significant distances exist between the power supply and the load, thus enhancing the performance in distributed power systems.
The dual current sensing technique is particularly noteworthy, as it not only improves the accuracy of current measurement but also enhances the overall stability of the power supply. The combination of DCR and rDS(ON) sensing allows for effective load balancing among multiple phases, which is crucial in multi-phase applications where uneven current distribution can lead to overheating and potential failure.
The comprehensive protection features embedded in the ISL6308A ensure that both the power supply and the connected load are safeguarded against potential faults. The overvoltage protection mechanism is crucial for preventing damage to sensitive components, while the adjustable overcurrent protection allows designers to tailor the system to their specific needs. The inclusion of protections against open circuits in the sensing inputs further enhances the reliability of the system, making the ISL6308A a robust choice for modern power management applications.The ISL6308A is a three-phase PWM control IC with integrated MOSFET drivers. It provides a precision voltage regulation system for multiple applications including, but not limited to, high current low voltage point-of-load converters, embedded applications and other general purpose low voltage medium to high current applications. The integration of power MOSFET drivers into the controller IC marks a departure from the separate PWM controller and driver configuration of previous multi-phase product families. By reducing the number of external parts, this integration allows for a cost and space saving power management solution.
Output voltage can be programmed using the on-chip DAC or an external precision reference. A two bit code programs the DAC reference to one of 4 possible values (0. 6V, 0. 9V, 1. 2V and 1. 5V). A unity gain, differential amplifier is provided for remote voltage sensing, compensating for any potential difference between remote and local grounds. The output voltage can also be offset through the use of single external resistor. An optional droop function is also implemented and can be disabled for applications having less stringent output voltage variation requirements or experiencing less severe step loads.
A unique feature of the ISL6308A is the combined use of both DCR and rDS(ON) current sensing. Load line voltage positioning and overcurrent protection are accomplished through continuous inductor DCR current sensing, while rDS(ON) current sensing is used for accurate channel-current balance. Using both methods of current sampling utilizes the best advantages of each technique. Protection features of this controller IC include a set of sophisticated overvoltage and overcurrent protection.
Overvoltage results in the converter turning the lower MOSFETs ON to clamp the rising output voltage and protect the load. An OVP output is also provided to drive an optional crowbar device. The overcurrent protection level is set through a single external resistor. Other protection features include protection against an open circuit on the remote sensing inputs. Combined, these features provide advanced protection for the output load. 🔗 External reference
Related Circuits
Ethernet has traditionally been a complex interface. All Ethernet chips up until now have had 100 pins or more, making them difficult to find in small quantities and challenging to use with microcontrollers that have limited memory. Microchip has...
The transistor depicted is a P-channel MOSFET functioning as a high-side switch. Typically, an N-channel MOSFET is preferred for low-side switching, but the P-channel variant can be utilized effectively with the addition of a load at the drain. When...
This fast circuit is compatible with any amplifier that has a line or high-level input (radio, CD) that allows mixing signals from a microphone with a chosen music source and adding adjustable sound effects to the voice. The circuit...
The LM317 is capable of providing extremely good load regulation, but a few precautions are needed to obtain maximum performance. For best performance, the programming resistor (R1) should be connected as close to the regulator as possible to minimize...
If the control circuit of this motor driver is based on a microcontroller or digital component, it is advisable to implement a buffer for each port that controls the stepper motor driver. This precaution helps prevent overloading the microcontroller...
Electronics tutorial on mesh current analysis and examples of mesh analysis used to analyze complex electrical circuits in DC theory. Mesh current analysis is a powerful technique used in circuit analysis to determine the currents flowing in the loops of...