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LTC3801 Datasheet(PDF) 11 Page - Linear Technology |
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LTC3801 Datasheet(HTML) 11 Page - Linear Technology |
11 / 12 page 11 LTC3801/LTC3801B sn3801 3801fs APPLICATIO S I FOR ATIO Foldback Current Limiting As described in the Output Diode Selection, the worst- case dissipation occurs with a short-circuited output when the diode conducts the current limit value almost continuously. To prevent excessive heating in the diode, foldback current limiting can be added to reduce the current in proportion to the severity of the fault. Foldback current limiting is implemented by adding di- odes DFB1 and DFB2 between the output and the ITH/RUN pin as shown in Figure 5. In a hard short (VOUT = 0V), the current will be reduced to approximately 50% of the maximum output current. Figure 5. Foldback Current Limiting VFB ITH/RUN VOUT LTC3801/ LTC3801B R1 3801 F05 R2 DFB1 DFB2 + PACKAGE DESCRIPTIO S6 Package 6-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1636) 1.50 – 1.75 (NOTE 4) 2.80 BSC 0.30 – 0.45 6 PLCS (NOTE 3) DATUM ‘A’ 0.09 – 0.20 (NOTE 3) S6 TSOT-23 0302 2.90 BSC (NOTE 4) 0.95 BSC 1.90 BSC 0.80 – 0.90 1.00 MAX 0.01 – 0.10 0.20 BSC 0.30 – 0.50 REF PIN ONE ID NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 3.85 MAX 0.62 MAX 0.95 REF RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 1.4 MIN 2.62 REF 1.22 REF 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193 Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. |
Similar Part No. - LTC3801_15 |
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Similar Description - LTC3801_15 |
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