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See Technical Specifications

UCC3972PW

BiCMOS cold cathode fluorescent lamp driver controller with lamp intensity control

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

UCC3972PW
Datasheet:

UCC3972PW Datasheet (PDF)
Type:

CCFL Controller
Frequency:

80kHz ~ 160kHz
Voltage - Supply:

4.5V ~ 20V
Current - Supply:

7 mA
EDA/CAD Models:

Request Free CAD Models for UCC3972PW

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UCC3972PW General Description

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.

Key Features

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)

Specifications

Category	Integrated Circuits (ICs)Power Management (PMIC)Lighting, Ballast Controllers	Series	-
Type	CCFL Controller	Frequency	80kHz ~ 160kHz
Voltage - Supply	4.5V ~ 20V	Current - Supply	7 mA
Current - Output Source/Sink	-	Dimming	No
Operating Temperature	0°C ~ 70°C	Mounting Type	Surface Mount
Base Product Number	UCC3972	Number of channels	1
Vin (min) (V)	4.5	Vin (max) (V)	25
Vout (max) (V)	18	Switching frequency (max) (kHz)	220
Features	Adjustable Switch Frequency	Operating temperature range (°C)	0 to 70
Rating	Catalog	feature-type	CCFL Driver
feature-maximum-operating-frequency-khz	160	feature-process-technology	BiCMOS
feature-minimum-operating-supply-voltage-v	4.5	feature-maximum-operating-supply-voltage-v	25
feature-typical-supply-current-ma	1	feature-maximum-power-dissipation-mw
feature-packaging	Tube	feature-pin-count	8
feature-cecc-qualified	No	feature-esd-protection
feature-military	No	feature-aec-qualified	No
feature-aec-qualified-number		feature-eccn-code	EAR99
feature-svhc	No	feature-svhc-exceeds-threshold	No