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As microcontroller (MCU)-based systems are becoming increasingly more interconnected in homes, offices, smart cities, hospitals, automobiles and other applications, they require access to the AC power that is predominant in our power distribution infrastructure. Our portfolio of AC-DC controllers offers access to and better control of power management from AC sources to help simplify your system design.

AC-DC Auxiliary Controllers

Intended for use in secondary MCU-based systems, these ICs can be coupled with an MCU or a Digitally Enhanced Power Analog (DEPA) controller to enable an offline power conversion function without requiring a dedicated primary side supply.

Inde-Flux™ Technology
Würth Elektronik has licensed our Inde-Flux technology to create a power transformer combined with an isolated signal winding that can be used to implement isolated feedback in this type of system. When you combine this solution with the architectural capabilities of our AC-DC auxiliary controllers, you can create an array of unique and powerful systems controlled by secondary MCUs.

How Can Our Auxiliary Controllers Solve Your Design Challenges?

  • Enable AC power without a dedicated primary supply
  • Enable control of primary power with tight coupling to a secondary MCU
  • Simplify AC power access with tighter functional integration using the Simplified Feedback Implementation

Inductor-less Offline Controllers

These controllers are designed for applications like battery chargers, proximity switches, television stand-by supplies and internal supplies for Switched-Mode Power Supplies (SMPSs) that call for a non-isolated, low-current DC power supply operating directly from the AC line. These types of systems do not require safety isolation because the internal electronics are not accessible by the end user. In these applications, an SMPS is far too complex and expensive, while a simple 60 Hz step-down transformer is cost effective but too large. Our inductor-less offline controllers provide a very cost-effective and compact solution for designs where line isolation is not necessary.

How Can Our Inductor-less Offline Controllers Solve Your Design Challenges?

  • Enable small, non-isolated offline power supply design with no magnetics
  • Ideal for single voltage range input with small load current (< 1W)
  • Can power MCU directly from AC line without transformer stepdown

Switch-Mode PWM Controllers

A unique input circuit allows these devices to self-start directly from a high-voltage input and  take the power to operate from one of the outputs of the converter it is controlling. This enables very efficient operation while maintaining input-to-output galvanic isolation that is only limited in voltage by the insulation system of the associated magnetic assembly.

Offline Linear Regulators

This high-voltage, low-output current, adjustable linear regulator has a wide operating input voltage range of 13.2–450V. The output voltage can be adjusted from 1.20–440V provided that the input voltage is at least 12V greater than the output voltage.

High Side Current Monitors

High side current monitor ICs transfer a high side current measurement voltage to its ground-referenced output with an accurate voltage gain of one. The measurement voltage typically originates at a current sense resistor which is located in a “high side” circuit, such as the positive supply line.


Primary-Side Auxiliary Controller

The MCP1012 enables the system start up, gating and protection of an offline flyback converter for a secondary MCU. Its tight integration with the MCU simplifies the implementation of the power function using fewer devices and at a reduced cost. Other system benefits include direct measurement and accurate regulation of voltage and/or current, higher loop bandwidth by direct loop closure and easier system communication for load-referenced systems. This high-voltage, self-powered device also offers protection features, a MOSFET driver and low-power sleep mode.

Quick Glance:

  • Direct operation off rectified AC power with transition to primary bias winding as secondary MCU assumes control
  • Gate driver for the primary-side FET
  • Internal current regulator sets biases during startup
  • When combined with secondary MCU, eliminates independent primary-side auxiliary supply
  • Overvoltage/undervoltage protection, overcurrent protection and Over Temperature Protection
  • Sleep mode option (controlled by MCU) for reduced standby power

Design Resources

MPLAB® Analog Designer

Provides design suggestions for common circuit needs, estimates performance for common modifications, and can export to MPLAB® Mindi™ Analog Simulator for verification.

MPLAB® Mindi™ Analog Simulator

Uses a SIMetrix / SIMPLIS environment to model circuit behavior, reducing design time with software debugging for initial design verification.

Power Check Design Service

Provides advice on your exact physical circuit layout, sharing best practices from an experienced power supply designer, so that physical hardware will match simulations.

AC/DC Power Conversion Products

View All Parametrics
Product Minimum Input Voltage (V) Maximum Input Voltage (V) Osc Frequency Min (kHz) Osc Frequency Max (kHz) On-Board FET? Type of On-Board FET?
MCP1012 16V (Typical) 500V Continuous/700V Transient 37 63 No NA
View All Parametrics
Product Buy Status Pricing Gain Quiescent Current max (µA) Rise and Fall Time (µs)
HV7800 http://www.microchipdirect.com/ProductDetails.aspx?Category=HV7800/ In Production 0.4700 Fixed, 1 50 0.7 - 2.0
HV7801 http://www.microchipdirect.com/ProductDetails.aspx?Category=HV7801/ In Production 0.4700 Fixed, 5 50 0.7 - 2.0
HV7802 http://www.microchipdirect.com/ProductDetails.aspx?Category=HV7802/ In Production 0.5500 Adjustable 50 0.7 - 1.4
View All Parametrics
Product Buy Status Pricing Adj Vout(V) ApplicationDesignNotes
MCP1012 http://www.microchipdirect.com/ProductDetails.aspx?Category=MCP1012/ In Production 0.4400
SR086 http://www.microchipdirect.com/ProductDetails.aspx?Category=SR086/ In Production 0.8700 9.0 - 50 --
SR087 http://www.microchipdirect.com/ProductDetails.aspx?Category=SR087/ In Production 0.8700 9.0 - 50 --
SR10 http://www.microchipdirect.com/ProductDetails.aspx?Category=SR10/ In Production 0.3900 6.0 - 28 AN-H65
View All Parametrics
Product Buy Status Pricing Dimming Features Output Current (mA)
LR8 http://www.microchipdirect.com/ProductDetails.aspx?Category=LR8/ In Production 0.4500 N/A Adj. Output, Overcurrent Limiting, OTP 10
View All Parametrics
Product Buy Status Pricing ApplicationDesignNotes Duty Cycle (%)
HV9120 http://www.microchipdirect.com/ProductDetails.aspx?Category=HV9120/ In Production 1.8300 AN-H13 49 ±2
HV9123 http://www.microchipdirect.com/ProductDetails.aspx?Category=HV9123/ In Production 2.0100 AN-H13 99 ±2