Home Power management LED drivers Backlight LED drivers

UCC2973

LAST TIME BUY

BiCMOS cold cathode fluorescent lamp driver controller with external sync

UCC2973 is in the process of being discontinued
Consider one of these alternates:
open-in-new Compare alternates
Similar functionality to the compared device
NEW TPS923655 ACTIVE 65-V, 4-A boost or buck-boost LED driver with inductive fast dimming and spread spectrum More dimming options, better dimming performance and better efficiency for LED

Product details

Vin (min) (V) 4.5 Vin (max) (V) 25 Switching frequency (max) (kHz) 220 Operating temperature range (°C) -40 to 85 Rating Military
Vin (min) (V) 4.5 Vin (max) (V) 25 Switching frequency (max) (kHz) 220 Operating temperature range (°C) -40 to 85 Rating Military
TSSOP (PW) 8 19.2 mm² 3 x 6.4
  • 1mA Typical Supply Current
  • Accurate Lamp Current Control
  • Analog or Low Frequency Dimming Capability
  • Open Lamp Protection
  • Programmable Startup Delay
  • 4.5V to 25V Operation
  • PWM Frequency Synchronized to External Resonant Tank
  • 8 Pin TSSOP and SOIC Packages Available
  • Internal Voltage Clamp Protects Transformer from Over-voltage (UCC3973)
  • 1mA Typical Supply Current
  • Accurate Lamp Current Control
  • Analog or Low Frequency Dimming Capability
  • Open Lamp Protection
  • Programmable Startup Delay
  • 4.5V to 25V Operation
  • PWM Frequency Synchronized to External Resonant Tank
  • 8 Pin TSSOP and SOIC Packages Available
  • Internal Voltage Clamp Protects Transformer from Over-voltage (UCC3973)

Design goals for a Cold Cathode Fluorescent Lamp (CCFL) converter used in a notebook computer or portable application include small size, high efficiency, and low cost. The UCC3972/3 CCFL controllers provide the necessary circuit blocks to implement a highly efficient CCFL backlight power supply in a small footprint 8 pin TSSOP package. The BiCMOS controllers typically consume less than 1mA of operating current, improving overall system efficiency when compared to bipolar controllers requiring 5mA to 10mA of operating current.

External parts count is minimized and system cost is reduced by integrating such features as a feedback controlled PWM driver stage, open lamp protection, startup delay and synchronization circuitry between the buck and push-pull stages. The UCC3972/3 include an internal shunt regulator, allowing the part to operate with input voltages from 4.5V up to 25V. The part supports both analog and externally generated low frequency dimming modes of operation.

The UCC3973 adds a programmable voltage clamp at the BUCK pin. This feature can be used to protect the transformer from overvoltage during startup or when an open lamp occurs. Transformer voltage is controlled by reducing duty cycle when an over-voltage is detected.

Design goals for a Cold Cathode Fluorescent Lamp (CCFL) converter used in a notebook computer or portable application include small size, high efficiency, and low cost. The UCC3972/3 CCFL controllers provide the necessary circuit blocks to implement a highly efficient CCFL backlight power supply in a small footprint 8 pin TSSOP package. The BiCMOS controllers typically consume less than 1mA of operating current, improving overall system efficiency when compared to bipolar controllers requiring 5mA to 10mA of operating current.

External parts count is minimized and system cost is reduced by integrating such features as a feedback controlled PWM driver stage, open lamp protection, startup delay and synchronization circuitry between the buck and push-pull stages. The UCC3972/3 include an internal shunt regulator, allowing the part to operate with input voltages from 4.5V up to 25V. The part supports both analog and externally generated low frequency dimming modes of operation.

The UCC3973 adds a programmable voltage clamp at the BUCK pin. This feature can be used to protect the transformer from overvoltage during startup or when an open lamp occurs. Transformer voltage is controlled by reducing duty cycle when an over-voltage is detected.

Download View video with transcript Video

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 2
Type Title Date
* Data sheet BiCMOS Cold Cathode Fluorescent Lamp Driver Controller datasheet (Rev. C) 28 Mar 2005
White paper Common LED Functions and LED Driver Design Considerations 21 Sep 2020

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Package Pins Download
TSSOP (PW) 8 View options

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos