You have entered a value in the highlighted fields below that contain invalid characters. Please revise your selection using valid characters only.

Product may not be an exact match for your search

You previously purchased this product. View in Order History



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


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

Manufacturer Part No:
Order Code:
Technical Datasheet:
UC3844BDG   Datasheet
See all Technical Docs

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




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

Product Information

Want to see similar products? Simply select your required attributes below and hit the button ×













Find similar products Choose and modify the attributes above to find similar products.

Technical Docs (2)

1,493 In stock

153 available for 1 - 2 business days delivery
1,340 available for 3 - 4 business days delivery

Available until stock is exhausted


Pricing is unavailable. Please contact customer services.

Price for:
Multiple: 1 Minimum: 1
Quantity Price Your Price
1+ HK$2.37
Promotional price
Contract Price
Web only price
Web only contract price

Pricing is unavailable. Please contact customer services.

No longer stocked:: No Longer Manufactured::
Add to Basket Add to Basket Pre-Order
Restricted Item
Add Part No. / Line Note
Total Price:
Total Price: ( )
Total Price: --