MIN1072M MinE-CAP Bulk Capacitor Miniaturization and Inrush Management IC for Very High Power Density AC/DC Converters Product Highlights C LV Up to 50% volume reduction of input bulk capacitors (E-CAPs) Eliminates inrush NTC 2 Significantly reduces i t stress on the input bridge rectifier and fuse C Partners with the InnoSwitch IC family for lowest component count HV ~ D L D V IS ultra-compact AC/DC converters VOUT MinE-CAP Advanced Protection / Safety Features S BP S BPP InnoSwitch3-CP Integrated temperature sensing and hysteretic thermal shutdown PI-9208-100720 Input surge protection Pin open/short-circuit and E-CAP UV/OV fault reporting Figure 1. Typical Application Schematic. Applications High power density universal input AC-DC converters Applications with very wide input range (90 350+ VAC) 180 Description 170 160 The MinE-CAP IC dramatically shrinks the size of input bulk capacitors 150 without compromising output ripple, operating efficiency or requiring 140 redesign of the transformer. When compared to traditional techniques 130 such as very high switching frequency operation, MinE-CAP achieves 120 110 the same or greater overall power supply size reduction whilst avoiding 100 the challenges of complex EMI filtering and the increased transformer/ 90 clamp dissipation associated with very high frequency designs. 80 70 MinE-CAP also precisely manages inrush current at AC turn-on, 60 eliminating the need for dissipative NTCs or large slow-blow fuses. 50 40 Figure 1 illustrates, the circuit configuration when using MinE-CAP. 30 The input E-CAPs are arranged with a small high-voltage capacitor (C 20 HV typically 400 V) in parallel with a low-voltage capacitor (C typically 10 LV 0 160 V) connected in series with the MinE-CAP IC. The physical size of 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 the input capacitors is minimized because a high percentage of the input capacitance is 160 V rated rather than 400 V as would normally Output Power (W) be used in conventional universal input converters. Figure 2. Typical Component Value Ranges for Optimal Space Saving and MinE-CAP can also be used in applications requiring extended Converter Operation. wide-range input (90 VAC to 350+VAC), again with a high percentage of the input capacitance 160 V rated along with either stacked 400 V or 500-600 V rated capacitors of much smaller value than would normally be required. During steady state-operation MinE-CAP introduces C into the circuit LV at low AC line voltage when maximum input capacitance is required. To achieve this, MinE-CAP monitors the input rail and voltage across C LV to dynamically engage and disengage this capacitor during every AC line cycle as required to ensure that the power supply operates smoothly across the entire specified input voltage range. Figure 3. MIN1072M MinSOP-16A Package. The selection chart of Figure 2 illustrates the recommended range of C and C values to achieve the required total input capacitance for a HV LV given output power. EMI filter configurations can be adopted depending on the form factor C is an electrolytic capacitor while C can be selected as an of a particular application. The MinE-CAP IC is designed to partner LV HV electrolytic or ceramic. Ceramic capacitors in the range of 1 to 5 mF directly with the InnoSwitch family of power supply ICs with a minimum 400 V (depending on power level) have very low esr and typically offer of external components. The existing InnoSwitch V pin resistor is the most space saving when the power supply is designed to connected to the MinE-CAP VTOP pin while a resistor connected to the accommodate ceramic capacitor characteristics (see Applications VBOT pin enables C voltage monitoring. Input voltage and fault LV Considerations section). 400 V electrolytic capacitors are lower cost information is transmitted from the MinE-CAP LINE (L) pin to the and when selected according to Figure 2 also provide up to 50% size InnoSwitch V pin with no additional components. The MinE-CAP IC reduction compared to traditional designs. A variety of standard input also derives its bias supply directly from the InnoSwitch BPP pin. www.power.com December 2020 This Product is Covered by Patents and/or Pending Patent Applications. 400 V C Range HV 160 V C Range LV Total Bulk Capacitance Range Capacitance (F) VBOT VTOP FWD SR BPS GND PI-9209-110220MinE-CAP D VTOP VBOT BP BP REGULATOR L LINE INTERFACE Gate BP DIGITAL CONTROLLER Driver BP/UV THERMAL SHUTDOWN PI-9216-082520 S Figure 4. MinE-CAP IC Block Diagram. 2 Rev. E 12/20 www.power.com