A slightly more sophisticated power control device is the ltc2937 sequencer voltage supervisor from analog devices.
Power sequence controller ic.
Voltage monitors continuously check the power supply output voltages and currents for over and under threshold levels.
The sample voltage applies externally can be derived from a simple 0 12v variable voltage power supply circuit.
Once the power rail is within 3 or less of its final value the reset ic enters the wait period defined by the solution before powering up the next rail.
Power sequencing is an essential part of any design especially in complex systems that utilize multiple power rails.
We can see that the power sequencing is accomplished by the interaction between the power logic the platform controller hub chipset and the imvp processor voltage regulator.
Power supply sequencing is required for microcontrollers fpgas dsps adcs and other devices that operate from multiple voltage rails.
With this option the reset ic monitors the power rails with tight threshold limits.
Power supply sequencers enable disable the power supplies in order at power up and power down.
So can powering one off.
These applications typically require that the core and analog blocks be powered up before the digital i o rails although some designs may require other sequences.
Using power sequencer can also prevent unnecessary current draw while portions of the design sit idle waiting for prerequisite systems to be powered.
This circuit was originally created to start up power supplies in sequence and subsequently switch them off for a second time in the opposite sequence.
If a fault is detected the supervisory ic automatically shuts down the system in an orderly fashion.
Sequencing using a reset ic ing is a reset ic with time delay.
Configuring one or more ltc2937s is as simple as a few clicks of the mouse.
Whether your system has two voltage rails or dozens we have a power sequencer to fit your requirements.
The gui communicates with any linear technology power system management ic including the ltc2937 on the i 2 c smbus.
This feature can be often useful for tinkering with equipment and circuits where power needs to be employed and taken out in a specific order.
This varying voltage applied to the 556 ic is used to vary the pwm of the pulses at the output and which eventually is used for the speed regulation of the connected motor.
Ltpowerplay graphical user interface gui displays all of the status and debug register information in one convenient interface.
Power sequencer tailored for unique systems.
Timing order of events and power levels need to be just right for proper system functionality and stability.
Like the lm3880 the ltc2937 can control the order and time delay of up to six power supplies or regulators figure 4.
Take control of your power supply sequencing.
