MA838

Features: ·Fully Digital Operation·Interfaces with most Microprocessors·Wide Power-Frequency Range·12-Bit Frequency Control accuracy·Carrier Frequency Selectable up to 24kHz·Waveform Stored in Internal ROM·Double Edged Regular Sampling·Selectable Minimum Pulse Width and Underlap Time·DC Injection ...

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MA838 Picture
SeekIC No. : 004408017 Detail

MA838: Features: ·Fully Digital Operation·Interfaces with most Microprocessors·Wide Power-Frequency Range·12-Bit Frequency Control accuracy·Carrier Frequency Selectable up to 24kHz·Waveform Stored in Inter...

floor Price/Ceiling Price

Part Number:
MA838
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/3/28

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Product Details

Description



Features:

·Fully Digital Operation
·Interfaces with most Microprocessors
·Wide Power-Frequency Range
·12-Bit Frequency Control accuracy
·Carrier Frequency Selectable up to 24kHz
·Waveform Stored in Internal ROM
·Double Edged Regular Sampling
·Selectable Minimum Pulse Width and Underlap Time
·DC Injection Braking



Pinout

  Connection Diagram


Specifications

Supply voltage, VDD............................................................. 10V
Voltage on any pin .................................VSS-0.3V to VDD +0.3V
Current through any I/O pin ...........................................±10mA
Storage temperature (see note)................... -65°C to +125°C
Operating temperature range (commercia...........0°C to +70°C
Operating temperature range (industrial).........-40°C to +85°C

NOTE: These temperature ranges apply to all package types.
Many package types are available and extended temperature
ranges can be offered for some packages. Further information
is available on request.

Stresses above those listed in the Absolute Maximum Ratings
may cause permanent damage to the device. These are stress
ratings only and functional operation of the device at these co
nditions, or at any other condition above those indicated in the
operations section of this specification, is not implied. Exposure
to Absolute MaximumRating conditions forextended periods may
affect device reliability



Description

The MA838 PWM generator has been designed to provide waveforms for the control of variable speed AC machines, uninterruptible power supplies and other forms of power electronic devices which require pulse width modulation as a means of efficient power control.

Two TTL level PWM outputs control the upper and lower switches in an inverter arm. This is usually via an external isolation and amplification stage.

Information contained within the pulse width modulated sequences controls the wave shape, power frequency and amplitude of the output waveform. Parameters such as the carrier frequency, minimum pulse width and pulse delay time may be defined during initialisation of the device. The pulse delay time (underlap) controls the delay between turning on and off the two power switches in the inverter, in order to accommodate variations in the turn-on and turn-off times of families of power devices.

The MA838 is easily controlled by a microprocessor and its fully digital generation of PWM waveforms gives unprecedented accuracy and temperature stability. Precision pulse shaping capability allows optimum efficiency with any power circuitry. The device operates as a stand-alone microprocessor peripheral reading the power waveform directly from an internal ROM and requiring microprocessor intervention only when operating parameters need to be changed.

An 8-bit multiplexed data bus is used to receive addresses and data from the microprocessor/controller. This is a standard MOTEL™ bus, compatible with most microprocessors/ controllers.




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