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MC34280FTBR2 Datasheet(PDF) 2 Page - ON Semiconductor |
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MC34280FTBR2 Datasheet(HTML) 2 Page - ON Semiconductor |
2 / 20 page MC34280 http://onsemi.com 2 Power ON Reset Lithium Battery Backup Voltage Reference Low Battery Detect Current Bias Control and Gate Drive Startup Current Limit Main Regulator with Synchronous Rectifier LIBATCL LIBATON LOWBATB PORB DGND LOWBATSEN 14 13 12 11 10 9 GND GND RLBb r = 900 k RLBa r = 300 k LIBATIN 27 28 29 30 31 32 GND N/C LIBATOUT VMAINGND VMAINSW 1N5817 M2 M1 IREF AGND 87 VREF VBAT GND RMAINb r = 1000 k CMAINb c = 100p VBAT VMAIN PDELAY VDD VDD VMAINFB VBAT 65 4 VREF GND GND Ren r = 1000 k VBAT Battery Lock Switch VMAIN GND CVDD c = 20u 32 1 ENABLE Riref r = 480 k R123 r = 5 CMAIN c = 100u 10 V SMT tantalum LMAIN L = 33u (Rs < 60 mOhm) GND Optional CMAINbp c = 100u 10 V SMT tantalum M3 d s d s d s GND GND Figure 1. Typical Application Block Diagram Cpor c = 80n VAUXADJ 15 VAUXCON 16 VAUXEN 17 VBAT LIBATCL LIBATON LOWBAT PORB VAUXADJ VAUXCON VAUXEN VAUXFBP GND Optional CAUXbp c = 100u 10 V SMT tantalum VBAT 18 20 21 19 22 23 24 Level Control Current Limit Auxiliary Regulator Control and Base Drive LAUX L = 22u (Rs < 60 mOhm) VAUXFBN GND Caux c = 30u 30 V SMT tantalum VAUX 1N5818 GND GND VAUXREF (1.1 V to 2.2 V) VAUXBDV VAUXCHG VAUXBASE N/C Rauxb r = 2.2 M Rauxa r = 200 k GND CAUXb c = 2n CAUXa c = 33n Q1 VAUXEMR 26 VAUXSW 25 Optional |
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