Features and Benefits
- Wide Input Voltage Range: 18V to 560V
- 630V/300mA Integrated Power Switch
- No Opto-Isolator Required for Regulation
- Quasi-Resonant Boundary Mode Operation
- Constant-Current and Constant-Voltage Regulation
- Low-Ripple Light Load Burst Mode® Operation
- Low Quiescent Current: 70μA
- Programmable Current Limit and Soft-Start
- TSSOP Package with High Voltage Spacing
The LT8315 is a high voltage flyback converter with integrated 630V/300mA switch. No opto-isolator is needed for regulation. The device samples the output voltage from the isolated flyback waveform appearing across a third winding on the transformer. Quasi-resonant boundary mode operation improves load regulation, reduces transformer size, and maintains high efficiency.
At start-up, the LT8315 charges its INTVCC capacitor via a current source attached to the DRAIN pin. During normal operation, the current source turns off and the device draws its power from a third winding on the transformer.
The LT8315 operates from a wide range of input supply voltages and can deliver up to 15W of power. It is available in a thermally enhanced 20-pin TSSOP package with four pins removed for high-voltage spacing.
- Isolated Telecom, Automotive, Industrial, Medical Power Supplies
- Isolated Off Line Housekeeping Power Supplies
- Electric Vehicles and Battery Stacks
Markets and Technologies
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (2)
Demonstration circuit 2478A is a non isolated buck converter featuring the LT8315. The demo board outputs 12V, and maintains tight regulation with a load current from 4mA to 120mA. It is optimized to operate over a wide 19V to 400V DC input voltage range. Output voltage accuracy stays within ±1% over the entire input voltage and load range.
Demonstration circuit 2337A is an offline isolated flyback converter featuring LT8315. The demo board outputs 12V, and maintains tight regulation with a load current from 4mA to 0.55A. It is optimized to operate over a wide AC input voltage range (90VAC to 265VAC, 47Hz to 63Hz). Output voltage accuracy stays within ±5% over the whole input voltage and load range.
Documentation & Resources
R570 Reliability Data3/23/2018
Single IC Can Produce Isolated or Nonisolated ±12 V Outputs from 30 V to 400 V Input11/1/2019 Analog Dialogue
No-Opto Flyback DC/DC Converters & Snubber Protection Circuits5/2/2017
560V Input, No-Opto Isolated Flyback Converter1/19/2017
No-Opto Isolated Flyback Converters6/10/2016
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
To launch ready-to-run LTspice demonstration circuits for this part:
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Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.
Models for the following parts are available in LTspice:
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.