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
AEC-Q100 data available for specific packages
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
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LT3795EFE#PBF | TSSOP-28 | FE | E | 05-08-1663 (EA) | Yes |
| LT3795EFE#TRPBF | TSSOP-28 | FE | E | 05-08-1663 (EA) | Yes |
| LT3795HFE#PBF | TSSOP-28 | FE | H | 05-08-1663 (EA) | Yes |
| LT3795HFE#TRPBF | TSSOP-28 | FE | H | 05-08-1663 (EA) | Yes |
| LT3795IFE#PBF | TSSOP-28 | FE | I | 05-08-1663 (EA) | Yes |
| LT3795IFE#TRPBF | TSSOP-28 | FE | I | 05-08-1663 (EA) | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LT3795EFE#PBF | TSSOP-28 | E | $4.93 | $3.45 | Yes | |
| LT3795EFE#TRPBF | TSSOP-28 | E | $3.51 | Yes | ||
| LT3795HFE#PBF | TSSOP-28 | H | $5.87 | $4.11 | Yes | |
| LT3795HFE#TRPBF | TSSOP-28 | H | $4.17 | Yes | ||
| LT3795IFE#PBF | TSSOP-28 | I | $5.51 | $3.86 | Yes | |
| LT3795IFE#TRPBF | TSSOP-28 | I | $3.92 | Yes | ||
| Buy Now • Request Samples | ||||||
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 | |
| Buy Now | |||
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LT3795HFE#PBF | TSSOP-28 | H | $5.87 | $4.11 | Yes | |
| LT3795HFE#TRPBF | TSSOP-28 | H | $4.17 | Yes | ||
| LT3795IFE#PBF | TSSOP-28 | I | $5.51 | $3.86 | Yes | |
| LT3795IFE#TRPBF | TSSOP-28 | I | $3.92 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- High Power LED, High Voltage LED
- Battery Chargers
- Accurate Current Limited Voltage Regulators
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Design Tools
LTspice
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LT3795
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
