Integrated Quad Low Side Switch for All-in-One Solution
Update Time: 2022-05-16 16:59:41
The IPS4260L is an integrated quad low-side switch that allows us to address better markets and designs that tend to avoid high-side buttons. IPS3260L can be used in consumer or industrial applications for valve or motor control, programmable logic control, PC peripherals, or more general-purpose applications. It is unique in its high-speed monolithic architecture and two diagnostic pins, non-dissipative overload, and per-channel thermal protection, providing an intelligent and robust system. Its integrated design also means that engineers do not have to use discrete solutions but can benefit from a more specific all-in-one device.
As a four-way switch, it uses four independent and protected channels to manage up to four loads, whether they are capacitive, resistive, or inductive. At the same time, its low-side aspect means that current flows through the switch and into the ground when the load is connected directly to the power supply. Europe and the Americas tend to prioritize high-end devices that switch the power source and click the bag to the ground. The latter tend to provide safer switching operation because the power supply is not directly connected to the load. On the other hand, low-end switching is easier to implement and often allows for components with higher RDS(on), which explains why Asian manufacturers have long favored this approach and why these markets often prioritize these solutions.
However, when we decided to introduce our first integrated quad low-side switch, we undoubtedly wanted to bring something new. We did so in the form of intelligent protection and diagnostic system.
An intelligent four-way low-side switch that protects
Typically, intelligent protection and detection systems are found on high-end switches. Low-end discrete solutions are standard, but they require external components for these additional functions. Therefore, we integrated these functions to achieve a more comprehensive device. Intelligent protection means protecting the device and the module in which it is installed from faulty loads or specific faults. For example, we cover the IPS4260L from excessive temperature by selectively shutting down the channel when the junction temperature exceeds a particular threshold, even in the case of a short circuit.
Users can also configure low-dissipation short-circuit protection. An external resistor sets the overcurrent threshold and an internal counter for the next restart. Similarly, we have embedded an Undervoltage lockout to shut down the device if the power supply becomes too unstable and drops to a specific level. In addition, the addition of a very inexpensive transient voltage suppression diode, which the system can share between all output channels, dramatically improves the switch's ability to demagnetize inductive loads while improving the robustness to inrush pulses. Finally, we also provide ground and VCC disconnect protection to prevent serious faults.
A Diagnosable, Intelligent Quad Low SideSwitch
We also integrate a brilliant diagnostic architecture that uses two open-drain signals to alert the microcontroller (MCU) when one of the built-in protection is in effect. Let's take the example of an overload, which causes overheating and thus enables temperature protection for one or more channels. In this case, the device first protects itself by activating intelligent built-in protections. Then it will report the event to the MCU using the FLT and INx signals. Another example is the open load detection feature. If the load is disconnected from the LOADx pin due to a disconnection, the OL pin sends a signal to the MCU.
As a result, developers can create sophisticated algorithms to respond to various situations and program alternative behaviors to protect the design and better respond to unexpected events. For example, let's go back to the low dissipation short circuit protection mechanism. We will see that the current flowing through the IPS4260L power stage does not exceed the configured time slot and is limited based on an externally set threshold. Resistor. A flag alerts the MCU that the power stage is restarting only after a configurable delay has passed. The system operates at a lower average temperature to determine if the problem still exists. As a result, an MCU that gets multiple flags can, in turn, take more sophisticated action in response to this problem.
IEC-61131-2 compliant silicon with low resistance
The IPS4260L is a monolithic switch, which means that all of its functions are on silicon, which means a larger chip size than if we had taken a more straightforward approach. However, we chose this approach because we knew that our manufacturing process allowed us to create a reliable and unique component. Its performance is the best of such architectures, as our typical RDS(on) is only 0.26 Ω, which means that the switch itself has minimal power loss, thus contributing positively to the overall efficiency of the product. Discrete low-side buttons are more common because creating an all-in-one solution is more complex. However, we delivered outstanding performance and an impressive feature set to change the industry.
The quality and robustness of the device are also reflected in some of its basic features, such as its wide operating voltage range from 8 V to 50 V. Since the part is primarily used in 24 V applications, engineers knew the component had enough margin to withstand significant voltage spikes or severe voltage drops. We designed and tested our new part number to meet the IEC-61131-2 standard for programmable controllers. Teams using multiple external components from different manufacturers must undergo a more complex testing process to ensure that their selected features meet these requirements. As a result, engineers who like our switches already know that the IPS4260L is ready for the harsh industrial environment. They will have an easier time passing the industry's stringent certifications.
Evaluation Board and GUI as the first step into the IPS4260L
Teams wanting to start experimenting with the IPS4260L can obtain the STEVAL-IFP029V1, an evaluation board that allows you to monitor the switch's channels, its performance, and safety features. This will enable them to program the cutoff delay time, and the LEDs on the board will alert the user if an event triggers thermal or short circuit protection. In addition, we offer the STSW-IPF029GUI, a graphical user interface that provides the option to drive the STEVAL-IFP029V1 at a steady-state or PWM, as well as a visual alternative to configure the timer that will define how often the system will check the device status.
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