Additional Resources: Product Page 3D Model date 04/26/2021 page 1 of 5 SERIES: VF-S250-XXA DESCRIPTION: AC-DC POWER SUPPLY FEATURES up to 250 W continuous power 600 W peak power within 500 s duty duration passive power factor correction power good signal remote on/off control 3000 Vac isolation voltage over load, over voltage, over temperature, and short circuit protections UL, cUL, and TUV 62368-1 safety approvals efficiency up to 85% RoHS output output output ripple and efficiency MODEL 1 2,3 voltage current power noise max max max typ (Vdc) (A) (W) (mVp-p) (%) VF-S250-05A 5 40 200 50 75% VF-S250-09A 9 25 225 90 83% VF-S250-12A 12 20.83 250 120 80% VF-S250-15A 15 16.67 250 150 83% VF-S250-18A 18 13.89 250 180 83% VF-S250-24A 24 10.42 250 240 83% VF-S250-28A 28 8.93 250 280 83% VF-S250-36A 36 6.93 250 360 83% VF-S250-48A 48 5.21 250 480 83% VF-S250-54A 54 4.63 250 540 83% Notes: 1. Maximum power must not exceed 135 W with convection cooling or 250 W with 16 CFM forced air. The 5 and 9 Vdc models have a maximum of 100 W and 121.5 W respectively for convection cooling. 2. 1% minimum load is required to maintain the ripple and regulation. 3. Ripple and noise is measured from 10 KHz to 20 MHz at output terminals with a 0.1 F ceramic capacitor and a 22 F electrolytic capacitor in parallel. PART NUMBER KEY VF - S250 - XX A - X X Base Number Output Voltage Low leakage option: blank = standard specification L = low leakage (contact factory) Input/Output connector: blank = Terminal block input / Terminal block output 1 = Molex input / Molex output 2 = Molex input / Terminal block output 3 = Terminal block input / Molex output cui.comAdditional Resources: Product Page 3D Model CUI Inc SERIES: VF-S250-XXA DESCRIPTION: AC-DC POWER SUPPLY date 04/26/2021 page 2 of 5 INPUT parameter conditions/description min typ max units 90 132 Vac voltage auto selectable 180 264 Vac frequency 47 63 Hz at 110~120 Vac, cold start 6 A current at 200~240 Vac, cold start 3 A at 115 Vac, cold start 35 A inrush current at 230 Vac, cold start 70 A power factor compliant to EN 61000-3-2 class A designated as RMSW on the CN1, requires a low signal to inhibit output, remote on/off off behavior: hiccup mode OUTPUT parameter conditions/description min typ max units regulation 1 % output voltage returns to within 1% in less than 2.5 ms for a 50% load change transient response peak transient does not exceed 5%. start-up time at 230 Vac 1 s hold-up time at 80% of rated maximim load 20 ms adjustability 5 % switching frequency fixed 25 kHz designated as PG on the CN1, signal goes high 100~500 ms after the output power good reaches regulation, signal goes low at least 1 ms before loss of regulation (open collector). fan drive 12 Vdc / 300 mA for external fan PROTECTIONS parameter conditions/description min typ max units over voltage protection AC input needs to be reset to restart the power supply 130 % over current protection automatically recovers 110 140 % short circuit protection short circuit can be continuous, recovers automatically over temperature protection auto recovery 110 C SAFETY & COMPLIANCE parameter conditions/description min typ max units for 3 seconds at 10 mA max primary to secondary: 3,000 Vac isolation voltage primary to transformer core: 1,500 Vac primary to earth chassis: 1,500 Vac safety approvals IEC/EN/UL 62368-1 EN 55032 Class B conducted / radiated, EN 61000-3-2, EN 61000-3-3, EN 55024 (IEC 61000-4-2, EMI/EMC IEC 61000-4-3, IEC 61000-4-4, IEC 61000-4-5, IEC 61000-4-6, IEC 61000-4-8, IEC 61000-4-11) standard model at 264 Vac 1 mA leakage current low-leakage model at 240 Vac 500 A low-leakage model at 120 Vac 300 A RoHS yes MTBF according to MIL-HDBK-217 at 30C 100,000 hrs cui.com