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Current Mode PWM Controller


Package | PIN: DW | 16
Temp: C (0 to 70)
Carrier: Partial Tube
Qty Price
1-9 $7.20
10-24 $6.48
25-99 $6.05
100-249 $5.43
250-499 $5.07
500-749 $4.41
750-999 $3.82
1000+ $3.74


  • Automatic Feedforward Compensation
  • Programmable Pulse-by-Pulse Current Limiting
  • Automatic Symmetry Correction in Push-Pull
  • Enhanced Load Response Characteristics
  • Parallel Operation Capability for Modular Power
  • Differential Current Sense Amplifier with Wide
    Common Mode Range
  • Double-Pulse Suppression
  • 500-mA (Peak) Totem-pole Outputs
  • ±1% Band Gap Reference
  • Undervoltage Lockout
  • Soft-Start Capability
  • Shutdown Terminal
  • 500-kHz Operation

Texas Instruments  UC3847DW

The UC1846/7 family of control devices provides all of the necessary features to implement fixed-frequency, current-mode control schemes while maintaining a minimum external parts count. The superior performance of this technique can be measured in improved line regulation, enhanced load response characteristics, and a simpler, easier-to-design control loop. Topological advantages include inherent pulse-by-pulse current limiting capability, automatic symmetry correction for push-pull converters, and the ability to parallel while maintaining equal current sharing. \

Protection circuitry includes built-in undervoltage lockout and programmable current limit, in addition to soft-start capability. A shutdown function is also available, which can initiate either a complete shutdown with automatic restart or latch the supply off.

Other features include fully-latched operation, double-pulse suppression, deadline adjust capability, and a ±1% trimmed band gap reference.

The UC1846 features low outputs in the OFF state, while the UCx847 features high outputs in the OFF state.