LT3795 - 110V LED Controller with Spread Spectrum Frequency Modulation

Features

  • 3000:1 True Color PWM™ Dimming
  • Wide Input Voltage Range: 4.5V to 110V
  • Input and Output Current Reporting
  • PMOS Switch Driver for PWM and Output Disconnect
  • Internal Spread Spectrum Frequency Modulation
  • ±2% Constant Voltage Regulation
  • ±3% Constant Current Regulation: 0V ≤ VOUT ≤ 110V
  • Programmable Input Current limit
  • CTRL Inputs Linearly Adjust LED Current
  • Adjustable Frequency: 100kHz to 1MHz
  • Programmable Open LED Protection with OPENLED Flag
  • Short-Circuit Protection and SHORTLED Flag
  • Programmable Undervoltage Lockout with Hysteresis
  • Soft-Start with Programmable Fault Restart Timer
  • C/10 Detection for Battery Charging
  • Available in 28-Lead TSSOP Package

Typical Application

LT3795 Typical Application
LT3795 Typical Application

Description

The LT®3795 is a DC/DC controller designed to regulate a constant-current or constant-voltage and is ideal for driving LEDs. It drives a low side external N-channel power MOSFET from an internal regulated 7.7V supply. The fixed frequency and current mode architecture result in stable operation over a wide range of supply and output voltages. Spread spectrum frequency modulation (SSFM) can be activated for improved electromagnetic compatibility (EMC) performance. The ground referred voltage FB pin serves as the input for several LED protection features, and also allows the converter to operate as a constant-voltage source. The maximum output current is set by an external resistor, and the output current amplifier has a rail-to-rail common mode range. The LT3795 also includes a separate input current sensing amplifier that is used to limit input current. The TG pin inverts and level shifts the PWM signal to drive the gate of the external PMOS. The PWM input provides LED dimming ratios of up to 3000:1, and the CTRL inputs provide additional analog dimming capability.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

TSSOP-28

LT3795 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT3795EFE#PBF TSSOP 28 E $4.93 $3.45 View
LT3795EFE#TRPBF TSSOP 28 E $3.51 View
LT3795HFE#PBF TSSOP 28 H $5.87 $4.11 View
LT3795HFE#TRPBF TSSOP 28 H $4.17 View
LT3795IFE#PBF TSSOP 28 I $5.51 $3.86 View
LT3795IFE#TRPBF TSSOP 28 I $3.92 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1827A LT3795 Demo Board | 110V LED Controller; 8V to 60Vin, 87Vout @ 0.4A, Spread Spectrum Frequency Modulation. $125.00
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Applications

  • High Power LED, High Voltage LED
  • Battery Chargers
  • Accurate Current Limited Voltage Regulators

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