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LTC1421-2.5 Datasheet(PDF) 7 Page - Linear Technology |
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LTC1421-2.5 Datasheet(HTML) 7 Page - Linear Technology |
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7 / 24 page  7 LTC1421/LTC1421-2.5 BLOCK DIAGRAM Figure 1. Nominal Operation Switching Waveforms Figure 2. Fault Detection Switching CPON CON1 t1 CON2 RESET DISABLE POR 1421 F01 PWRGD t2 t3 t4 t6 t5 t7 CPON VCCLO – SETLO t9 FAULT RESET POR 1421 F02 PWRGD t2 t5 t11 t6 t10 SWITCHI G TI E WAVEFOR S – + + – + + – VTRIP + – + – 50mV 50mV CPON AUXVCC VCCHI SETLO CP1 CP2 VCCLO SETHI GATELO RAMP GATEHI VOUTHI VOUTLO 19 22 23 18 21 10 17 16 20 VCC FAULT CON1 CON2 POR DISABLE 9 24 4 1 2 3 5 20 µA VCC CP3 CP4 CP5 73.5k N1 N2 AUXVCC FB REF 11 8 PWRGD 6 RESET 7 COMPOUT 15 COMP – 14 COMP + 13 1421 BD 71.5k 26.7k 20 µA 20 µA 1.232V REFERENCE CHARGE PUMP UNDERVOLTAGE LOCKOUT RESET TIMING VCC VCC VCC – + GND DIGITAL CONTROL 12 |
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