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Overview
| Topology | Buck Converter |
| Input voltage | 18-560 V |
| Switching frequency | 138-142 kHz |
| Output 1 | 12 V / 0.8 A |
| IC revision | A |
Description
The LT®8315 is a high voltage flyback converter with integrated630V/300mA switch. No opto-isolator is needed forregulation. The device samples the output voltage from theisolated flyback waveform appearing across a third windingon the transformer. Quasi-resonant boundary modeoperation improves load regulation, reduces transformersize, and maintains high efficiency.At start-up, the LT8315 charges its INTVCC capacitor via acurrent source attached to the DRAIN pin. During normaloperation, the current source turns off and the devicedraws its power from a third winding on the transformer.The LT8315 operates from a wide range of input supplyvoltages and can deliver up to 15W of power. It is availablein a thermally enhanced 20-pin TSSOP package with fourpins removed for high-voltage spacing.
Features
Remark: Design Note 559 contain same inputs, outputs and circuit diagram so datafile is addednn Wide Input Voltage Range: 18V to 560Vnn 630V/300mA Integrated Power Switchnn No Opto-Isolator Required for Regulationnn Quasi-Resonant Boundary Mode Operationnn Constant-Current and Constant-Voltage Regulationnn Low-Ripple Light Load Burst Mode® Operationnn Low Quiescent Current: 70μAnn Programmable Current Limit and Soft-Startnn TSSOP Package with High-Voltage Spacing
Typical applications
- Electric Vehicles and Battery Stacks
- Isolated Telecom, Automotive, Industrial, Medical Power Supplies, Isolated Off-Line Housekeeping Power Supplies
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | VIN | VOut1(V) | IOut1(A) | Vaux(V) | RDC 1(Ω) | RDC 2(Ω) | RDC 3(Ω) | fswitch(kHz) | L(mH) | NPRI : NSEC : NAUX | ISAT(mA) | VT(V (AC)) | L(mm) | W(mm) | H(mm) | Mount | Size | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-OLLT Offline Flyback Transformers, 99 - 269 V (AC), 12 V | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-OLLT Offline Flyback Transformers | Input Voltage 99 - 269 V (AC) | Output Voltage 112 V | Output Current 11 A | Auxiliary Voltage12 V | DC Resistance 11.725 Ω | DC Resistance 20.037 Ω | DC Resistance 30.41 Ω | Switching Frequency 50 | Inductance2.75 mH | Turns Ratio10:1:1 | Saturation Current500 mA | Insulation Test Voltage4000 V (AC) | Length22.25 mm | Width14.6 mm | Height23.24 mm | MountTHT | SizeEE20/10/6 | ||||
| WE-OLLT Offline Flyback Transformers, 99 - 269 V (AC), 48 V | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-OLLT Offline Flyback Transformers | Input Voltage 99 - 269 V (AC) | Output Voltage 148 V | Output Current 10.3 A | Auxiliary Voltage12 V | DC Resistance 11.4 Ω | DC Resistance 20.425 Ω | DC Resistance 30.32 Ω | Switching Frequency 50 | Inductance2.4 mH | Turns Ratio2.5:1:0.25 | Saturation Current490 mA | Insulation Test Voltage4000 V (AC) | Length22.25 mm | Width14.6 mm | Height23.24 mm | MountTHT | SizeEE20/10/6 | ||||
 | WE-OLLT Offline Flyback Transformers, 99 - 269 V (AC), 5 V | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-OLLT Offline Flyback Transformers | Input Voltage 99 - 269 V (AC) | Output Voltage 15 V | Output Current 11.6 A | Auxiliary Voltage20 V | DC Resistance 14.55 Ω | DC Resistance 20.015 Ω | DC Resistance 30.695 Ω | Switching Frequency 100 | Inductance3.3 mH | Turns Ratio24:1:4 | Saturation Current360 mA | Insulation Test Voltage1500 V (AC) | Length13.46 mm | Width17.75 mm | Height12.7 mm | MountSMT | SizeEP13 |