OFFLINE UPS ADDENDUM TO AN1279 This addendum is to be used in conjunction with the Offline UPS Reference Design Application Note (AN1279). The material covered in this addendum applies to the 110V version of the Offline UPS Reference Design. Efficiency Graph 110V UPS Efficiency 90 Percent (%) 85 80 75 70 65 10 20 30 40 50 60 70 80 90 100 % Load Hardware Changes The following table calls out specific hardware changes made for the 110V Offline UPS Reference Design. Designator Value / Description Manufacturer Part Number T1 Push-Pull Transformer (N = 4:32) Custom Wound C5, C7 Q7, Q8, Q9, Q10 Push-Pull Output Capacitors (1500 µF, 250V) Comments The construction of the transformer, bobbin, and core remained the same EET-ED2E152EA Inverter IGBT's (600V, 40A) STGP19NC60WD R87 9.10 kOhm 1/8W 1% MCR10EZHF9101 R138, R158, R162, R178 4.30 kOhm 1/8W 1% MCR10EZHF4301 AC sense (ACI, ACO) R137, R157 3.30 kOhm 1/8W 1% MCR10EZHF3301 DC Bus sense (UDC) © 2009 Microchip Technology Inc. page 1 OFFLINE UPS ADDENDUM TO AN1279 Electrical Specifications The following table provides the electrical specifications for the 110V version of the Offline UPS Reference Design. Parameter Description Min Typ Max Units Comments VIN Input Voltage 99 110 121 V fIN Input Frequency 57 60 63 Hz VOUT Output Voltage — 110 — V fOUT Output Frequency 59 60 61 Hz Battery Input Voltage 34 36 45 V POUT Continuous Output Power — — 1000 VA OLP Over Load Protection >100 — 135 % 1350 VA (2 sec) THD Output Voltage THD — — 5 % Full Load Resistive System Efficiency Battery Charger Mode — 84 — % Inverter Mode System Efficiency — 84 — % Mains to Inverter Transfer Time — — 12 ms Inverter to Mains Transfer Time — 0 — ms Battery Charge Current — 2 2.5 A Battery Input Current (Note 1) — — 40 A Operating Temperature — 25 — °C CF Crest Factor — — 3:1 — PF Power Factor (Inductive Load) .65 — — — Power Factor (Rectifier Load) .65 — — — VBATTERY η tTRANSFER ICHARGE I_BATTERY T Note 1: page 2 @100% Load Only tested at .8 PF UPS run time will vary with output load current and the discharge rate of the batteries. Refer to the battery data sheet for specific discharge times. © 2009 Microchip Technology Inc.