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LT1641-1 Datasheet(PDF) 11 Page - Linear Technology |
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LT1641-1 Datasheet(HTML) 11 Page - Linear Technology |
11 / 12 page 11 LT1641-1/LT1641-2 164112fc APPLICATIO S I FOR ATIO VCC TIMER SENSE GATE 87 6 54 2 1 3 D1 CMPZ 5248B GND PWRGD FB R5 10 Ω 5% ON R1 294k 1% VIN 48V UV = 37V GND 1641-1 F12 R2 10.2k 1% C2 0.68 µF R6, 1k, 5% RS 0.01 Ω C1 10nF R3 143k 1% R4 4.22k 1% R7 47k 5% + CL 220 µF Q2 MMBT5551LT1 VOUT LT1641-1 ACTIVE LOW ENABLE MODULE VOUT– VOUT+ VIN– ON/OFF VIN+ Q1 IRF530 SHORT PIN Figure 12. Active Low Enable Module R1 SENSE RESISTOR, RS 1641-1 F14 R2 LT1641-1 ILOAD ILOAD Figure 14. Recommended Layout for R1, R2 and RS Figure 13. Gate Drive vs Supply Voltage VCC (V) 8 18 16 14 12 10 8 6 4 2 0 1641-1 F13 13 18 23 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. Layout Considerations To achieve accurate current sensing, a Kelvin connection is recommended. The minimum trace width for 1oz cop- per foil is 0.02" per amp to make sure the trace stays at a reasonable temperature. 0.03" per amp or wider is recom- mended. Note that 1oz copper exhibits a sheet resistance of about 530 µΩ/ . Small resistances add up quickly in high current applications. To improve noise immunity, put the resistor divider to the ON pin close to the chip and keep traces to VCC and GND short. A 0.1µF capacitor from the ON pin to GND also helps reject induced noise. Figure 14 shows a layout that addresses these issues. |
Similar Part No. - LT1641-1_15 |
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Similar Description - LT1641-1_15 |
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