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UC3844BDG

UC3844BDG -ON SEMICONDUCTOR - PWM Controller, 25V-12V supply, 250 kHz, 13.5V/200mA out, SOIC-14

ON SEMICONDUCTOR UC3844BDG

Image is for illustrative purposes only. Please refer to product description.

Manufacturer Part No:
UC3844BDG
Order Code:
1228725
Technical Datasheet:
UC3844BDG   Datasheet
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Product Overview

The UC3844BDG is a high performance fixed frequency Current Mode Controller designed for off-line and DC-to-DC converter applications offering the designer a cost-effective solution with minimal external components. This integrated circuits feature an oscillator, a temperature compensated reference, high gain error amplifier, current sensing comparator and a high current totem pole output ideally suited for driving a power MOSFET. Also included are protective features consisting of input and reference under-voltage lockouts each with hysteresis, cycle-by-cycle current limiting, a latch for single pulse metering and a flip-flop which blanks the output off every other oscillator cycle, allowing output deadtimes to be programmed from 50 to 70%. The UCX844B has UVLO thresholds of 16V (on) and 10V (off), ideally suited for off-line converters. The UCX845B is tailored for lower voltage applications having UVLO thresholds of 8.5V (on) and 7.6V (off).
  • Trimmed oscillator for precise frequency control
  • Oscillator frequency guaranteed at 250kHz
  • Current mode operation to 500kHz output switching frequency
  • Output dead time adjustable from 50 to 70%
  • Automatic feed forward compensation
  • Latching PWM for cycle-by-cycle current limiting
  • Internally trimmed reference with under-voltage lockout
  • High current totem pole output
  • Under-voltage lockout with hysteresis
  • Low startup and operating current
  • 36V Bias and driver voltage
  • 30mA Total power supply and Zener current
  • +150°C Maximum junction temperature

Applications

Automotive

Warnings

ESD sensitive device, take proper precaution while handling the device.

Product Information

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-
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13.5V
:
200mA
:
12V
:
25V
:
SOIC
:
14Pins
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250kHz
:
0°C
:
70°C
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-
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-
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Technical Docs (2)

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