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Product Variant Information section
Product Specification Section
Pricing Section

Stock : 2 500

Sur commande : 0
Stock d'usine :Stock d'usine : 0
Délai d'usine : 6 Semaines
Commande minimale : 2 500
Multiples de : 2 500
Quantité Prix Internet
2 500 $0.20
5 000 $0.163
7 500 $0.161
10 000+ $0.16
Total :

500,00 $

USD
Attributs
Attributes Table
Supply Current-Max 17mA
Supply Voltage 10V to 30V
Frequency-Max 275kHz
Topology Flyback
Rated Power 702mW
Duty Cycle-Min 0%
Duty Cycle-Max 50%
Operating Temp Range 0°C to 70°C
Storage Temperature Range -65°C to +150°C
Output Current -1mA
Thermal Resistance 178°C/W
Fonctionnalités et applications

The UC3844B, UC3845B 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 included 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

To learn more about the UC3844B produuct family, Click Here