UC2871QTR Datasheet Summary

Overview

The UC2871QTR is a highly efficient fluorescent lamp control IC from Texas Instruments, optimized for applications requiring precise control of resonant fluorescent lamps and LCD supplies. It integrates a PWM controller for additional supply requirements and features a true disconnect feature with only 1µA ICC when disabled, making it ideal for battery-powered systems.

Features

• Low Power Consumption: 1µA ICC when disabled
• PWM Control for LCD Supply: Integrated PWM controller for additional supply requirements
• Zero Voltage Switching (ZVS): On push-pull drivers for reduced switching losses
• Open Lamp Detect Circuitry: Detects open lamp conditions after soft-start cycle
• Wide Operating Voltage Range: 4.5V to 20V
• Non-saturating Transformer Topology: Ensures smooth operation
• Smooth Duty Cycle Control: 100% duty cycle on Buck PWM and 0% to 95% on Flyback PWM
• Precision 1% Reference: Ensures accurate operation
• Under Voltage Lockout: Protects the device from low supply voltage
• Flyback Current Limit: Limits current in flyback mode
• Accurate Frequency Control: Ensures stable operation

Electrical Characteristics

• Reference Voltage: 2.963V to 3.037V at TJ=25°C
• Oscillator Frequency: 57kHz to 78kHz (free running) and up to 240kHz (max sync frequency)
• Charge Current: 180µA to 220µA at VCT = 1.5V
• Zero Detect Threshold: 0.46V to 0.56V
• Error Amplifier Input Voltage: 1.445V to 1.505V
• Output High Voltage: 3.1V to 3.9V
• Output Low Voltage: 0.1V to 0.2V
• Output Source Current: -350µA to -500µA
• Output Sink Current: 10mA to 20mA
• Common Mode Range: 0 to VIN-1V
• Unity Gain Bandwidth: 1MHz at TJ = 25°C

Absolute Maximum Ratings

• Analog Inputs: -0.3V to +10V
• VCC, VC Voltage: +20V
• Zero Detect Input Current: +10mA (high impedance source), +20V (low impedance source)
• Power Dissipation: 1W at TA = 25°C
• Storage Temperature: -65°C to +150°C
• Lead Temperature: 300°C

Package Information

• Package Type: PLCC (Plastic Leaded Chip Carrier)
• Pin Count: 20
• Package Drawing: FN (S-PQCC-J**)
• Eco Plan: Green (RoHS & no Sb/Br)
• Lead/Ball Finish: CU SN (Tin/Lead)
• Moisture Sensitivity Level (MSL): Level-2-260C-1 YEAR
• Peak Temp: 260°C

Pin Configuration

• Pin 1: Gnd (Ground)
• Pin 2: B Out (Output B)
• Pin 3: A Out (Output A)
• Pin 4: VC (Voltage Control)
• Pin 5: E/A 1 Comp (Error Amplifier 1 Compensation)
• Pin 6: SS (Soft Start)
• Pin 7: E/A 1(-) (Error Amplifier 1 Inverting Input)
• Pin 8: N/C (No Connection)
• Pin 9: CT (Timing Capacitor)
• Pin 10: Zero Detect
• Pin 11: N/C (No Connection)
• Pin 12: VREF (Voltage Reference)
• Pin 13: E/A 2(+) (Error Amplifier 2 Non-Inverting Input)
• Pin 14: E/A 2(-) (Error Amplifier 2 Inverting Input)
• Pin 15: E/A 2 Comp (Error Amplifier 2 Compensation)
• Pin 16: VCC (Supply Voltage)
• Pin 17: Enable (Enable Input)
• Pin 18: Flyback ISENSE (Flyback Current Sense)
• Pin 19: D Out (Output D)
• Pin 20: C Out (Output C)

Applications

• Resonant Fluorescent Lamp Drivers: Ideal for driving CCFLs in various applications
• LCD Supply Modulation: Suitable for LCD displays requiring precise voltage control
• Battery-Powered Systems: Optimized for low power consumption and true disconnect feature

Ordering Information

• Manufacturer: Texas Instruments
• Part Number: UC2871QTR
• Package Type: PLCC-20
• Operating Temperature Range: -25°C to +85°C