UCC3889

Features: · Transformerless Off-line Applications· Ideal Primary-side Bias Supply· Efficient BiCMOS Design· Wide Input Range· Fixed or Adjustable Low Voltage Output· Uses Low Cost SMD Inductors· Short Circuit Protected· Optional Isolation CapabilityPinoutSpecificationsICC. . . . . . . . . . . . . ...

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UCC3889 Picture
SeekIC No. : 004536048 Detail

UCC3889: Features: · Transformerless Off-line Applications· Ideal Primary-side Bias Supply· Efficient BiCMOS Design· Wide Input Range· Fixed or Adjustable Low Voltage Output· Uses Low Cost SMD Inductors· Sho...

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Part Number:
UCC3889
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2025/1/6

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Product Details

Description



Features:

· Transformerless Off-line Applications
· Ideal Primary-side Bias Supply
· Efficient BiCMOS Design
· Wide Input Range
· Fixed or Adjustable Low Voltage Output
· Uses Low Cost SMD Inductors
· Short Circuit Protected
· Optional Isolation Capability



Pinout

  Connection Diagram


Specifications

ICC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . 5mA
Current into TON Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . .  1.5mA
Voltage on VOUT Pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V
Current into TOFF Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250A
Storage Temperature . . . . . . . . . . . . . . . . . . -65°C to +150°C

Note: Unless otherwise indicated, voltages are referenced to ground and currents are positive into, negative out of, the specified terminals.



Description

The UCC1889 controller is optimized for use as an off-line, low power, low voltage, regulated bias supply. The unique circuit topology utilized in this device can be visualized as two cascaded flyback converters, each operating in the discontinuous mode, and both driven from a single external power switch. The significant benefit of this approach is the ability to achieve voltage conversion ratios of 400V to 12V with no transformer and low internal losses.

The UCC1889 control algorithm utilized by the UCC1889 is to force the switch on time to be inversely proportional to the input line voltage while the switch off time is made inversely proportional to the output voltage. This action is automatically controlled by an internal feedback loop and reference. The cascaded configuration allows a voltage conversion from 400V to 12V to be achieved with a switch duty cycle greater  than 10%. This topology also offers inherent short circuit protection since as the output voltage falls to zero, the switch off time approaches infinity.

The UCC1889 output voltage can be easily set to 12V or 18V. Moreover, it can be programmed for other output voltages less than 18V with a few additional components. An isolated version can be achieved with this topology as described further in Unitrode Application Note U-149




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