EC7AW24-72S12

The EC7AW24-72S12 has a specified input range of 24-72V DC, but includes undervoltage lockout (UVLO) protection. The typical UVLO threshold is 21V with 2V hysteresis, meaning the converter will shut down if input drops below approximately 21V and will not restart until input rises above 23V. This protection prevents abnormal operation during brownout conditions or when starting from a slowly rising input voltage. For reliable operation, ensure your input voltage source can maintain at least 24V under all load conditions including startup inrush. If using the converter with a 24V battery, account for voltage sag during discharge - a nominal 24V lead-acid battery can drop to 21V at 50% discharge, which is still within the operating range.

Ensure your input voltage source maintains at least 24V under all operating conditions including startup and peak loads.

The EC7AW24-72S12 can drive up to 1000uF of external output capacitance without instability. The converter includes internal output capacitors for basic filtering, but additional external capacitance is often needed for: Reducing output ripple voltage under transient loads; Providing hold-up time during input interruptions; Filtering high-frequency noise for sensitive loads. When adding external capacitors, use low-ESR ceramic or tantalum capacitors placed close to the load. Very large capacitance values (>1000uF) can cause startup issues as the converter must charge the capacitor while maintaining regulation. If large capacitance is required, consider using a soft-start circuit or current-limited precharge. For typical applications, 100-470uF is sufficient for most loads.

Limit external output capacitance to 1000uF maximum. For larger capacitance needs, consult our FAE team for proper implementation.

The EC7AW24-72S12 is rated for 3000V DC isolation between input and output, tested for 60 seconds during production. This is a dielectric withstand test voltage, not the continuous working voltage. The continuous working isolation voltage is typically 500-1000V depending on environmental conditions and safety agency requirements. The isolation barrier is designed to meet reinforced insulation requirements per IEC 60950-1 and IEC 62368-1. The isolation resistance is greater than 10^9 ohms at 500V DC. For medical applications requiring 2xMOPP (Means of Patient Protection), verify that the specific model meets the required creepage and clearance distances for your application. The 3000V rating provides substantial margin for industrial applications with transient overvoltages.

For safety-critical applications, verify that the isolation rating meets your specific safety standard requirements.

The EC7AW24-72S12 does not include active current sharing and is not recommended for direct parallel connection without external circuitry. For increased power requirements, consider these approaches: Use a single higher-power converter from the EC15AW series (15W); Implement external OR-ing diodes with current balancing resistors for passive sharing; Use the EC7AW24-72S12 with different output voltages to create multiple isolated rails. If parallel operation is required, external Schottky OR-ing diodes should be used to prevent back-feeding, and small series resistors (0.1-0.5 ohm) can help balance current. However, this approach reduces efficiency and regulation accuracy. For new designs requiring more than 7W, I recommend selecting a single higher-power converter rather than paralleling multiple units.

For power requirements above 7W, select a single higher-power converter rather than attempting to parallel EC7AW units.

The EC7AW24-72S12 is rated for full 7W output from -40°C to +71°C ambient with natural convection cooling. Above 71°C, output power must be derated linearly to 50% at 85°C. The derating curve is based on the converter's internal temperature rise and maximum allowable junction temperatures of the semiconductors. For example, at 78°C ambient, maximum output power is approximately 5.25W (75% of rated). The converter's efficiency decreases slightly at higher temperatures, increasing internal heat generation. For high-temperature applications, consider: Improving airflow around the converter; Reducing load power; Selecting a higher-power converter and operating it at partial load; Using thermal vias and copper pours on the PCB to spread heat. The converter includes overtemperature protection that shuts down at approximately 115°C internal temperature.

For ambient temperatures above 71°C, calculate required derating or improve thermal management to maintain reliable operation.

The EC7AW24-72S12 is designed to meet EN 55032 Class B emissions standards with appropriate external filtering. The converter uses a switching frequency of approximately 300kHz, which is high enough to allow small magnetic components while being low enough to minimize EMI. The metal package provides shielding that reduces radiated emissions. For conducted emissions compliance: Add input filtering capacitors (typically 10-100uF electrolytic plus 0.1uF ceramic); Consider a common-mode choke for applications with strict EMI requirements; Follow PCB layout guidelines in the application note. The 3000V isolation transformer provides inherent common-mode noise rejection. For medical applications with very low leakage current requirements, additional isolation may be needed. P-Duke provides application notes with recommended filter designs for various EMI standards.

For EMI-sensitive applications or strict regulatory requirements, implement recommended input filtering and follow PCB layout guidelines.