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LNK304DG Datasheet(PDF) 6 Page - Power Integrations, Inc. |
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LNK304DG Datasheet(HTML) 6 Page - Power Integrations, Inc. |
6 / 20 page 2-6 Rev. I 11/08 6 LNK302/304-306 Table 2. Common Circuit Configurations Using LinkSwitch-TN. (continued on next page) TOPOLOGY BASIC CIRCUIT SCHEMATIC KEY FEATURES High-Side Buck – Direct Feedback 1. Output referenced to input 2. Positive output (V O) with respect to -VIN 3. Step down – V O < VIN 4. Low cost direct feedback (±10% typ.) High-Side Buck – Optocoupler Feedback 1. Output referenced to input 2. Positive output (V O) with respect to -VIN 3. Step down – V O < VIN 4. Optocoupler feedback - Accuracy only limited by reference choice - Low cost non-safety rated opto - No pre-load required 5. Minimum no-load consumption Low-Side Buck – Optocoupler Feedback 1. Output referenced to input 2. Negative output (V O) with respect to +VIN 3. Step down – V O < VIN 4. Optocoupler feedback - Accuracy only limited by reference choice - Low cost non-safety rated opto - No pre-load required - Ideal for driving LEDs Low-Side Buck – Constant Current LED Driver High-Side Buck Boost – Direct Feedback 1. Output referenced to input 2. Negative output (V O) with respect to +VIN 3. Step up/down – V O > VIN or VO < VIN 4. Low cost direct feedback (±10% typ.) 5. Fail-safe – output is not subjected to input voltage if the internal MOSFET fails 6. Ideal for driving LEDs – better accuracy and temperature stability than Low-side Buck constant current LED driver High-Side Buck Boost – Constant Current LED Driver V O V IN PI-3751-121003 + + FB BP S D LinkSwitch-TN LinkSwitch-TN PI-3752-121003 + + BP FB D S V O V IN LinkSwitch-TN PI-3753-111903 + + BP FB D S V O V IN LinkSwitch-TN PI-3754-112103 + + BP FB D S V IN I O R = V F V F I O V O V IN PI-3755-121003 + FB BP S D LinkSwitch-TN R SENSE = R SENSE 300 Ω 2 k Ω 2 V I O I O 100 nF 10 μF 50 V V IN PI-3779-120803 + FB BP S D LinkSwitch-TN |
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