Technical Data 4301 VP Effective August 2017 VERSA-PAC® Inductors and Transformers (Surface Mount) VERSA-PAC® Performance characteristicsBipolar (Push-Pull) Power vs FrequencyInductance characteristics 70.0 60.0 OCL vs. Isat 100.0% 50.0 90.0% VP 5 40.0 80.0% Watts 30.0 VP 4 70.0% L 20.0 60.0% VP 3 OC f 10.0 o 50.0% VP 2 % VP 1 40.0% 0.0 100 200 300 400 500 Frequency, kHz 30.0% Unipolar (Flyback) Power vs Frequency 20.0% 40.0 10.0% 35.0 0.0%0.0% 20.0% 40.0% 60.0% 80.0% 100.0% 120.0% 140.0% 160.0% 180.0% 200.0% 30.0 % of Isat VP 5 25.0 20.0 Watts VP 4 15.0 VP 3 10.0 VP 2 5.0 These curves represent typical power handling capability. VP 1 0.0 100 200 300 400 500 Indicated power levels may not be achievable with all configurations. Frequency, kHz3.3V Buck Converter5V to 3.3V Buck Converter With 5V Output This circuit utilizes the gap of the VP5-0083 to handle the 12.5 This circuit minimizes both board space and cost by eliminating a Amp output current without saturating. In each of the five VERSA- second regulator. VERSA-PAC ’s gap serves to prevent core PAC sizes, the gap is varied to achieve a selection of specific saturation during the switch on-time and also stores energy for the inductance and current values (see VERSA-PAC Data Table). +5V load which is delivered during the flyback interval. The +3.3V buck winding is configured by placing two windings in series while All six windings are connected in parallel to minimize AC/DC the +5V is generated by an additional flyback winding stacked on copper losses and to maximize heat dissipation. With VERSA- the 3.3V output. Extra windings are paralleled with primary PAC, this circuit works well at or above 300 KHz. Also, the closed windings to handle more current. The turns ratio of 2:1 adds 1.67V flux-path EFD geometry enables much lower radiation to the +3.3V during the flyback interval to achieve +5V. characteristics than open-path bobbin core style components. +V VERSA-PAC +V VP5-0083 RTN 1 12 1,2 +5V@ Synchronous 2 11 VERSA-PAC 7 Controller 1A 3 10 VP5-0083 IC Synchronous 4 9 Controller 5 8 6 IC 6 7 +3.3V@ 12,11 3,4,5 12.5A + + LEVEL SHIFT 10,9,8 RTN +3.3V@ + 4.2A LITHIUM-ION BATTERY TO 3.3V SEPIC CONVERTER VERSA-PAC VP5-0083 The voltage of a Lithium-Ion Battery varies above and below 12 11 10 4 5 6 +3.3V depending on the degree of charge. The SEPIC + +3.3V@ configuration takes advantage of VERSA-PAC ’s multiple tightly 6A Controller + coupled windings. This results in lower ripple current which lowers IC W/Integral 1 2 3 9 8 7 Switch noise and core losses substantially. The circuit does not require a + snubber to control the voltage “spike” associated with switch turn- off, and is quite efficient due to lower RMS current in the windings. 8 www.eaton.com/electronics