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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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UCC3973PWTRG4 Datenblatt(PDF) 1 Page - Texas Instruments |
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UCC3973PWTRG4 Datenblatt(HTML) 1 Page - Texas Instruments |
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1 / 24 page  UCC1972/3 UCC2972/3 UCC3972/3 DESCRIPTION Design goals for a Cold Cathode Fluorescent Lamp (CCFL) converter used in a notebook computer or portable application include small size, high effi- ciency, and low cost. The UCC3972/3 CCFL controllers provide the neces- sary 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 pro- tection, startup delay and synchronization circuitry between the buck and push-pull stages. The UCC3972/3 include an internal shunt regulator, al- lowing 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. BiCMOS Cold Cathode Fluorescent Lamp Driver Controller 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) SLUS252C - OCTOBER 1998 - REVISED MARCH 2005 3 8 6 5 VBAT 4 2 1 7 VDD GND MODE COMP BUCK OUT FB C7 0.1µF D1 R10 R11 Q3 C5 0.1µF L1 68µH R6 75Ω Q2 R2 1k T1 C6 27pF LAMP HV LAMP LV R3 68k D2 R5 10k R4 750 ANALOG DIMMING DLFD RLFD 68k 0V-5V LOW FREQUENCY CONTROL SIGNAL C4 33nF LOW FREQUENCY DIMMING C2 1µF R1 1kΩ C1 6.8µF SYSTEM VOLTAGE (4.5V TO 25V) C3 1µF UCC3972 UCC3973 NO INTERNAL VOLTAGE CLAMP INTERNAL VOLTAGE CLAMP LIMITS TRANSFORMER VOLTAGE AT START-UP OR DURING FAULT UCC3972/3 TYPICAL APPLICATION CIRCUIT UDG-99154 |
Ähnliche Teilenummer - UCC3973PWTRG4 |
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Ähnliche Beschreibung - UCC3973PWTRG4 |
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