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Manufacturer Part #

UC2844BD1R2G

UC2844B Series 36 V 275 kHz High Performance Current Mode Controller - SOIC-8

Mfr. Name: ON Semiconductor
Standard Pkg:
Product Variant Information section
Date Code: 2006
Product Specification Section
Technical Attributes
Attributes Table
Package Style:  SOIC-8
Mounting Method: Surface Mount
Features & Applications

The UC2844B, UC2845B series are high performance fixed frequency current mode controllers. They are specifically designed for Off−Line and dc−dc converter applications offering the designer a cost−effective solution with minimal external components. These 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 inclued are protective features consisting of input and reference undervoltage 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%. These devices are available in an 8−pin dual−in−line and surface mount (SOIC−8) plastic package as well as the 14−pin plastic surface mount (SOIC−14). The SOIC−14 package has separate power and ground pins for the totem pole output stage. The UCX844B has UVLO thresholds of 16 V (on) and 10 V (off), ideally suited for off−line converters. The UCX845B is tailored for lower voltage applications having UVLO thresholds of 8.5 V(on) and 7.6 V (off).

Key Features:

  • Trimmed Oscillator for Precise Frequency Control
  • Oscillator Frequency Guaranteed at 250 kHz
  • Current Mode Operation to 500 kHz Output Switching Frequency
  • Output Deadtime Adjustable from 50% to 70%
  • Automatic Feed Forward Compensation
  • Latching PWM for Cycle−By−Cycle Current Limiting
  • Internally Trimmed Reference with Undervoltage Lockout
  • High Current Totem Pole Output
  • Undervoltage Lockout with Hysteresis
  • Low Startup and Operating Current
  • Pb−Free Packages are Available
Pricing Section
Stock:
0
Minimum Order:
2,500
Multiple Of:
2,500
On Order:
0
Factory Stock:Factory Stock:
0
Total
$600.00
USD
Quantity
Web Price
2,500
$0.24
5,000
$0.196
10,000
$0.193
12,500+
$0.192
Product Variant Information section