Sometimes applications have devices with multiple voltage requirements (eg, core voltages, I/O voltages). The sequence in which these voltages rise is important.
A common requirement is that one voltage must rise and stabilise before another voltage. These multiple-voltage applications can benefit from small microcontrollers, such as Microchip Technology's PIC10F206, to control the sequence in which the voltages in the system are allowed to rise. The PIC microcontroller can be added to an existing design with a minimal increase in complexity or cost.
The circuit operates by using pulse width modulation (PWM) to slowly increase the amount of time the power supply is allowed to operate (the complete technical brief is available at www.microchip.com). The circuit will first increase the duty cycle of one PWM output from 0 to 100% to allow the first voltage to rise. It will then pause and increase the duty cycle of the second PWM output from 0 to 100% to allow the second voltage to rise, as shown in the timing diagram. While doing this, an active-low shutdown pin will be polled to ensure that the voltage on the under-voltage lockout pin is above 0,6 V.
This particular solution demonstrates how to control the shutdown pins of two power supplies in order to provide one with a specifiable soft-start time. The delay between PWM outputs and when the softstart begins can be customised. Furthermore, the design provides both an active-low shutdown pin and an under-voltage lockout pin.
Analysis of switch-mode power supply: inductor violations Altron Arrow
Editor's Choice Power Electronics / Power Management
Common switch-mode power supply (SMPS) design errors are discussed, and their appropriate rectification is specified, with details on complications that arise with the power stage design of DC-DC switching regulators.
Read more...Microsoft Windows IoT on ARM Altron Arrow
Computer/Embedded Technology
This expansion means that the Windows IoT ecosystem can now harness the power of ARM processors, known for their energy efficiency and versatility.
Read more...The 8-bit survival syndrome – Part 2
DSP, Micros & Memory
Just like the 4-bit pre-microcontroller, the 8-bit MCU has been finding ways to stick around. Their features and speeds have been improving, offering competitive reasons to work with them.
Read more...Microchip introduces ECC608 TrustMANAGER Altron Arrow
Circuit & System Protection
To increase security on IoT products and facilitate easier setup and management, Microchip Technology has added the ECC608 TrustMANAGER with Kudelski IoT keySTREAM, Software as a Service (SaaS) to its Trust Platform portfolio of devices, services and tools.
Read more...Enhanced code protection for USB µC portfolio Future Electronics
DSP, Micros & Memory
To help easily incorporate USB power and communication functionality into embedded systems, Microchip Technology has launched the AVR DU family of microcontrollers.
Read more...General-purpose MCU with RISC-V architecture EBV Electrolink
DSP, Micros & Memory
Renesas has released a general-purpose MCU to enhance its existing RISC-V portfolio, and this is its first MCU using a RISC-V core developed internally at the company.
Read more...8-bit MCU with I3C support Avnet Silica
DSP, Micros & Memory
The PIC18-Q20 8-bit microcontrollers from Microchip easily interface with devices operating in multiple voltage domains, and the built-in I3C interface supports higher-speed and lower-power data transfers than I2C.
Read more...SolidRun unveils new SoM Altron Arrow
AI & ML
SolidRun and Hailo has unveiled a game-changer for engineers and AI product developers with the launch of their market-ready SoM, which packs the cutting-edge capabilities of the Hailo-15H SoC.
printer friendly version