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Product details

Parameters

Topology Flyback Control method Voltage feed forward VCC (Min) (V) 8.6 VCC (Max) (V) 9.3 Duty cycle (Max) (%) 55 UVLO thresholds on/off (V) 8.4/6.3 Frequency (Max) (kHz) 250 Operating temperature range (C) -40 to 85 Gate drive (Typ) (A) 0.2 Features Constant on-time, Error Amplifier, Green Mode, Light Load Efficiency, Soft Start Rating Catalog open-in-new Find other PWM controllers & resonant controllers

Package | Pins | Size

PDIP (P) 8 93 mm² 9.81 x 9.43 SOIC (D) 8 19 mm² 3.91 x 4.9 open-in-new Find other PWM controllers & resonant controllers

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

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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 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 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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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 4
Type Title Date
* Datasheet Off-line Power Supply Controller datasheet (Rev. A) Feb. 20, 2003
Selection guides Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Application notes DN-59A UCC3889 Bias Supply Controller EVM Kit - Schematic Sep. 05, 1999
Application notes U-149 Elegantly Simple Off-Line Bias Supply for Very Low Power Applications Sep. 05, 1999

Design & development

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Design tools & simulation

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Reference designs

REFERENCE DESIGNS Download
Universal AC DLP Power Supply (10V @ 6A)
PMP5500 — This reference design provides 400W of power from a universal AC input with power factor correction. The UCC28019A controls a PFC boost front end, while the UCC25600 LLC resonant-half bridge converts the PFC output to isolated 40V, 33V, and 27V outputs. The total system efficiency is over 89% with a (...)
REFERENCE DESIGNS Download
High-Eff 2Stage Univ Input Pwr Supply Using Trans Mode PFC/LLC Resonant Conv Reference Design
PMP8920 — Low EMI, high efficiency, high power factor and reliable power supply are main focus of the PMP8920 design for telecom applications. Transient mode (TM) power factor correction (PFC) with UCC28051 and LLC series resonant converter (SRC) with UCC25600 are applied in PMP8911. In addition, synchronous (...)
REFERENCE DESIGNS Download
High Eff 2Stage Univ Input Power Supply-Transition Mode PFC LLC Resonant Conv Reference Design
PMP8911 — Low EMI, high efficiency, high power factor and reliable power supply are main focus of the PMP8911 design for telecom applications. Transient mode (TM) power factor correction (PFC) with UCC28051 and LLC series resonant converter (SRC) with UCC25600 are applied in PMP8911. Low EMI is expected with (...)
REFERENCE DESIGNS Download
PFC, Resonant Half-Bridge, Buck (PFC, 42V@6A) for Digital Audio
PMP5327 — The PMP5327 reference design provides a 42V/6A output with power factor correction from a universal AC input voltage range. This design uses the UCC28019A to control the front end PFC boost stage. The output of the PFC is followed by a UCC25600 LLC resonant half-bridge. The total efficieny, from (...)

CAD/CAE symbols

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SOIC (D) 8 View options

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