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LT3763 Datasheet(PDF) 1 Page - Linear Integrated Systems |
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LT3763 Datasheet(HTML) 1 Page - Linear Integrated Systems |
1 / 30 page LT3922 1 3922f For more information www.linear.com/LT3922 Typical applicaTion FeaTures DescripTion 36V, 2A Synchronous Step-Up LED Driver The LT®3922 is a monolithic, synchronous, step-up DC/ DC converter that utilizes fixed-frequency, peak current control and provides PWM dimming for a string of LEDs. The LED current is programmed by an analog voltage or the duty cycle of pulses at the CTRL pin. The LT3922 will maintain±2%currentregulationthroughanexternalsense resistor over a wide range of output voltages. The switching frequency is programmable from 200kHz to 2MHz by an external resistor at the RT pin or by an external clock applied at the SYNC/SPRD pin. With the optionalSpreadSpectrumFrequencyModulationenabled, the frequency varies from 100% to 125% to reduce EMI. The LT3922 also includes a driver for an external high- side PFET for PWM dimming and an internal PWM signal generator for analog control of PWM dimming when an external signal is not available. Additional features include an accurate external reference voltage for use with the CTRL and PWM pins, an LED current monitor, an accurate EN/UVLO pin threshold, open-drainfaultreportingforopen-circuitandshort-circuit load conditions, and thermal shutdown. 2MHz, 93% Efficient 10W (30V, 333mA) Boost LED Driver Efficiency vs VIN applicaTions n ±2% LED Current Regulation n ±2% Output Voltage Regulation n 5000:1 PWM Dimming at 100Hz n 128:1 Internal PWM Dimming n Spread-Spectrum Frequency Modulation n Silent Switcher® Architecture for Low EMI n Operates in Boost, Buck Mode and Buck-Boost Mode n 2.8V to 36V Input Voltage Range n Up to 34V LED String Voltage n 2A, 40V Internal Switches n 200kHz to 2MHz with SYNC Function n Analog or Duty Cycle LED Current Control n Open/Short LED Protection and Fault Indication n Thermally Enhanced 28-Pin (4mm × 5mm) QFN n Automotive and Industrial Lighting n Machine Vision L , LT, LTC, LTM, Linear Technology, the Linear logo and Silent Switcher are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 7199560, 7321203, and other patents pending. VIN VIN 8V TO 27V 365k 59.0k 100k EN/UVLO OVLO VREF CTRL ANALOG DIM PWM DIM PWM SYNC/SPRD INTVCC FAULT BST SW VOUT VOUT FB RP VC RT ISP GND GND ISN PWMTG ISMON 3922 TA01a LT3922 1M 1M 33.2k 100k 10k 1nF 1µF 0.1µF L1 4.7µH M1 300m 4.7µF 0.47µF 0.47µF 30V 333mA LED SS 45.3k 2MHz 2.2µF 10nF 4.7µF VLED = 30V fSW = 2MHz 100% PWM Duty Cycle VIN (V) 6 9 12 15 18 21 24 27 30 70 75 80 85 90 95 100 3922 TA01b |
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