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LT1172 Datasheet(PDF) 11 Page - Linear Technology |
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LT1172 Datasheet(HTML) 11 Page - Linear Technology |
11 / 20 page 11 LT1170/LT1171/LT1172 Negative-to-Positive Buck-Boost Converter † Driving High Voltage FET (for Off-Line Applications, See AN25) (Note that maximum output currents are divided by 2 for LT1171, by 4 for LT1172.) Negative Buck Converter External Current Limit External Current Limit 1170/1/2 TA05 VIN VSW LT1170 GND 10V TO 20V D1 + D G Q1 1170/1/2 TA06 VX D1 LT1170 GND R2 ≈ 2V VC R1 500 Ω C4* 100 µF VOUT 12V 2A 1170/1/2 TA07 R3 2.2k C2 1000 µF D1 C1 0.22 µF Q1 VIN VC FB VSW LT1170 GND OPTIONAL INPUT FILTER L3 VIN –20V REQUIRED IF INPUT LEADS ≥ 2" PULSE ENGINEERING 92114, COILTRONICS 50-2-52 * ** R2 1.24k L1** 50 µH OPTIONAL OUTPUT FILTER C3 L2 R1 11.3k THIS CIRCUIT IS OFTEN USED TO CONVERT –48V TO 5V. TO GUARANTEE FULL SHORT-CIRCUIT PROTECTION, THE CURRENT LIMIT CIRCUIT SHOWN IN AN19, FIGURE 39, SHOULD BE ADDED WITH C1 REDUCED TO 200pF. † + + 1170/1/2 TA08 R2 C2 VIN VC FB VSW LT1170 GND VIN NOTE THAT THE LT1170 GND PIN IS NO LONGER COMMON TO VIN –. R1 1k + – C1 1000pF Q1 RS C3* 100 µF –5.2V 4.5A 1170/1/2 TA09 R3 L1** 50 µH R1 4.64k C2 1000 µF D1 C1 Q1 2N3906 VIN VC FB VSW LT1170 GND OPTIONAL INPUT FILTER L3 VIN –20V LOAD REQUIRED IF INPUT LEADS ≥ 2" PULSE ENGINEERING 92114 COILTRONICS 50-2-52 * ** R2 1.24k R4 12k L2 4 µH OPTIONAL OUTPUT FILTER C4 200 µF + + + TYPICAL APPLICATIO S |
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