Additional Resources: Product Page | 3D Model | PCB Footprint date 01/14/2021 page 1 of 7 SERIES: VX78-500 DESCRIPTION: NON-ISOLATED DC SWITCHING REGULATOR FEATURES * * * * * * * * * * wide input pin-out compatible with linear regulators encapsulated UL & CSA approved high efficiency up to 95% no-load input current as low as 0.2 mA wide operating temp: -40C to +85C supports negative output short circuit protection on the output EN 62368-1 MODEL input voltage1 output voltage output current output power ripple & noise2 efficiency3 typ (Vdc) range (Vdc) (Vdc) max (mA) max (W) max (mVp-p) typ (%) VX7803-500 24 4.75~36 3.3 500 1.65 75 86 VX7805-500 24 12 6.5~36 7~31 5 -5 500 -300 2.5 1.5 75 75 90 80 VX78039-500 24 12~36 9 500 4.5 75 93 VX78012-500 24 12 15~36 8~24 12 -12 500 -150 6 1.8 75 75 94 84 VX7815-500 24 12 19~36 8~21 15 -15 500 -150 7.5 2.25 75 75 95 85 Notes: 1. For input voltages higher than 30 Vdc, a 22 F / 50 V input capacitor is required. 2. Tested at nominal input, 10~100% load, 20 MHz bandwidth, with 10 F electrolytic and 1 F ceramic capacitor on the output. At loads below 10%, the max ripple and noise of the 3.3 & 5 Vdc outputs will be 150 mVp-p, and the other outputs will be 2% Vo. 3. Measured at min Vin, full load. 4. All specifications are measured at Ta=25C, humidity < 75%, nominal input voltage, and rated output load unless otherwise specified. PART NUMBER KEY VX78 XX - 500 Base Number Output Voltage cui.com Output Current Additional Resources: Product Page | 3D Model | PCB Footprint CUI Inc SERIES: VX78-500 DESCRIPTION: NON-ISOLATED DC SWITCHING REGULATOR date 01/14/2021 page 2 of 7 INPUT parameter conditions/description min typ max units operating input voltage1 for positive output applications for negative output applications 4.75 7 24 12 36 31 Vdc Vdc filter capacitor filter 0.2 1.5 mA typ max units 680 330 F F input reverse polartiy protection no no-load input current Note: positive outputs 1. See Model section on page 1 for specific input voltage ranges. OUTPUT parameter conditions/description maximum capacitive load2 for positive output applications for negative output applications voltage accuracy at full load, input voltage range 3.3 Vdc output model all other models 2 2 4 3 % % line regulation at full load, input voltage range 0.2 0.4 % load regulation at nominal input, 10~100% load 0.4 0.6 % switching frequency at nominal input voltage, full load 850 kHz transient recovery time at nominal input voltage, 25% load step change 0.2 1 ms transient response deviation at nominal input voltage, 25% load step change 50 temperature coefficient at full load Note: min 550 250 mV 0.03 %/C 2. The maximum capacitive load was tested at nominal input voltage, full load. PROTECTIONS parameter conditions/description short circuit protection continuous, auto recovery min typ max units min typ max units SAFETY AND COMPLIANCE parameter conditions/description safety approvals certified to 62368-1: EN certified to 60950-1: UL EMI/EMC EN 55032, EN 55024 conducted emissions CISPR22/EN55022, class B (external circuit required, see Figure 6-b) radiated emissions CISPR22/EN55022, class B (external circuit required, see Figure 6-b) ESD IEC/EN61000-4-2, contact 4kV, class B radiated immunity IEC/EN61000-4-3, 10V/m, class A EFT/burst IEC/EN61000-4-4, 1kV, class B (external circuit required, see Figure 6-a) surge IEC/EN61000-4-5, line-line 1kV, class B (external circuit required, see Figure 6-a) conducted immunity IEC/EN61000-4-6, 3 Vr.m.s, class A MTBF as per MIL-HDBK-217F, 25C RoHS 2011/65/EU 2,000,000 cui.com hours Additional Resources: Product Page | 3D Model | PCB Footprint CUI Inc SERIES: VX78-500 DESCRIPTION: NON-ISOLATED DC SWITCHING REGULATOR date 01/14/2021 page 3 of 7 ENVIRONMENTAL parameter conditions/description min max units operating temperature see derating curve -40 85 C -55 125 C 5 95 % max units 260 C max units storage temperature storage humidity non-condensing typ SOLDERABILITY parameter conditions/description wave soldering see wave soldering profile min typ Peak Temp. 260C Max. Wave Soldering Time 4 Sec. Max. 250 Temperature (C) 200 10 Sec. Max. 150 100 50 0 MECHANICAL Time (sec.) parameter conditions/description dimensions 11.60 x 7.55 x 10.16 [0.457 x 0.297 x 0.400 inch] min case material black flame-retardant heat-proof plastic (UL94V-0) weight typ mm 1.8 MECHANICAL DRAWING units: mm [inch] tolerance: 0.25[0.010] pin diameter tolerance: 0.10[0.004] PIN CONNECTIONS PIN +OUTPUT -OUTPUT 1 +VIN +VIN 2 GND -VOUT 3 +VOUT GND cui.com g Additional Resources: Product Page | 3D Model | PCB Footprint CUI Inc SERIES: VX78-500 DESCRIPTION: NON-ISOLATED DC SWITCHING REGULATOR date 01/14/2021 page 4 of 7 DERATING CURVE Temperature Derating Curve (Natural Convention) 120 Load (%) 100 80 60 40 20 0 -40 0 40 71 85 120 Ambient Temperature (C) EFFICIENCY CURVES VX7803-500 Efficiency Curve Positive Output, Efficiency vs. Load Current (at Vin nominal) 88 84 86 82 Efficiency (%) Efficiency (%) VX7803-500 Efficiency Curve Positive Output, Efficiency vs. Input Voltage (at full load) 84 82 80 78 76 4.75 80 78 76 74 72 8 12 16 20 24 Input Voltage (Vdc) 28 32 70 10 36 96 94 92 40 50 60 70 Load Current (%) 80 90 100 98 96 90 88 86 84 82 80 15 30 VX78012-500 Efficiency Curve Positive Output, Efficiency vs. Load Current (at Vin nominal) Efficiency (%) Efficiency (%) VX78012-500 Efficiency Curve Positive Output, Efficiency vs. Input Voltage (at full load) 20 18 21 24 27 Input Voltage (Vdc) 30 33 36 94 92 90 88 86 84 82 10 cui.com 20 30 40 50 60 70 Load Current (%) 80 90 100 Additional Resources: Product Page | 3D Model | PCB Footprint CUI Inc SERIES: VX78-500 DESCRIPTION: NON-ISOLATED DC SWITCHING REGULATOR date 01/14/2021 page 5 of 7 EFFICIENCY CURVES (CONTINUED) VX78012-500 Efficiency Curve Negative Output, Efficiency vs. Input Voltage (at full load) VX78012-500 Efficiency Curve Negative Output , Efficiency vs. Load Current (at Vin nominal) 88 Efficiency (%) Efficiency (%) 86 84 82 80 78 76 74 8 12 16 Input Voltage (Vdc) 20 24 88 86 84 82 80 78 76 74 72 70 10 50 60 70 Load Current (%) 80 90 100 94 92 90 88 86 84 19 20 22 24 26 28 30 Input Voltage (Vdc) 32 34 36 94 92 90 88 86 84 82 10 VX7815-500 Efficiency Curve Negative Output, Efficiency vs. Input Voltage (at full load) Efficiency (%) 88 86 84 82 8 12 15 Input Voltage (Vdc) 18 20 30 40 50 60 70 Load Current (%) 80 90 100 VX7815-500 Efficiency Curve Negative Output, Efficiency vs. Load Current (at Vin nominal) 90 Efficiency (%) 40 96 98 96 80 78 30 VX7815-500 Efficiency Curve Positive Output, Efficiency vs. Load Current (at Vin nominal) Efficiency (%) Efficiency (%) VX7815-500 Efficiency Curve Positive Output, Efficiency vs. Input Voltage (at full load) 20 21 90 88 86 84 82 80 78 76 74 10 cui.com 20 30 40 50 60 70 Load Current (%) 80 90 100 Additional Resources: Product Page | 3D Model | PCB Footprint CUI Inc SERIES: VX78-500 DESCRIPTION: NON-ISOLATED DC SWITCHING REGULATOR date 01/14/2021 page 6 of 7 TYPICAL APPLICATION CIRCUIT Figure 1 Figure 2 Positive Output Application Circuit Negative Output Application Circuit 1 +Vin 3 DC/D C C1 +Vout 2 GND 1 2 C3 GND LDM 1 C4 DC/DC -Vout VX7803-500 10 F/50 V 22 F/10 V VX7805-500 10 F/50 V 22 F/10 V VX78039-500 10 F/50 V 22 F/16 V VX78012-500 10 F/50 V 22 F/25 V VX7815-500 10 F/50 V 22 F/25 V C2 Figure 4 Figure 5 Positive Output Ripple Reduction Circuit 1 DC/DC 3 Negative Output Ripple Reduction Circuit L Vout 2 C1 C1, C3 C2, C4 (ceramic capacitor) (ceramic capacitor) 3 C1 +Vin C2 GN D Model Number GND 2 3 Table 1 External Capacitor Table +Vout 3 DC/DC -Vout GN D Figure 3 Positive and Negative Output Paralleling Application Circuit +Vin 2 DC / DC C1 C2 GND 1 +Vin +Vin C2 1 3 C1 22 F DC/DC 2 L Vout C2 22 F GND GND EMC RECOMMENDED CIRCUIT Figure 6 Table 2 Recommended external circuit components V in FUSE L DM 1 L DM 2 Vin + M OV GN D Note: C0 D DC/DC +Vo GN D C1 C5 C2 L OAD E FUSE choose according to actual input current MOV S20K30 LDM1 82 H C0 680 F/50 V C1, C2 see Table 1 C5 4.7 F/50 V LDM2 12 H 1. C1 & C2 (C3 & C4) are required and should be connected as close to the module pins as possible. 2. To reduce the output ripple further, it is recommended to connect an "LC" filter at the output terminal with a recommended value of 10~47 H for the L component. (See Figures 4 & 5). 3. When using application circuit in Figure 3, a 10 H LDM component is recommended to reduce the interference. cui.com Additional Resources: Product Page | 3D Model | PCB Footprint CUI Inc SERIES: VX78-500 DESCRIPTION: NON-ISOLATED DC SWITCHING REGULATOR date 01/14/2021 page 7 of 7 REVISION HISTORY rev. description date 1.0 initial release 05/18/2017 1.01 features and safety line updated, packaging removed 01/14/2021 The revision history provided is for informational purposes only and is believed to be accurate. Headquarters 20050 SW 112th Ave. Tualatin, OR 97062 800.275.4899 Fax 503.612.2383 cui.com techsupport@cui.com CUI offers a two (2) year limited warranty. Complete warranty information is listed on our website. CUI reserves the right to make changes to the product at any time without notice. Information provided by CUI is believed to be accurate and reliable. However, no responsibility is assumed by CUI for its use, nor for any infringements of patents or other rights of third parties which may result from its use. CUI products are not authorized or warranted for use as critical components in equipment that requires an extremely high level of reliability. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.