MPS20-24S12

The MPS20-24S12 maintains high efficiency across the load range: At 100% load (20W): 88% efficiency; At 75% load (15W): 88% efficiency (peak); At 50% load (10W): 87% efficiency; At 25% load (5W): 84% efficiency. The efficiency curve is optimized for medical applications where the converter typically operates at moderate to high loads. The high efficiency minimizes heat generation, which is important for: Enclosed medical devices with limited airflow; Battery-powered portable equipment; Thermally sensitive applications; Energy efficiency requirements. For thermal calculations, use the efficiency at your typical operating load. The efficiency remains above 84% down to 25% load, providing good performance across a wide operating range.

For thermal design, use the efficiency at your typical operating load to calculate power dissipation.

The MPS20-24S12 provides good transient response for medical applications with pulsed loads: Voltage deviation is +/-5% for 50% load step; Recovery time is less than 5ms to return to within 1%; Output capacitors can be added to improve transient response; The control loop is optimized for typical medical load profiles. For applications with large load transients: Add external output capacitance (up to 1000uF); Use low-ESR ceramic capacitors for best performance; Place capacitors close to the load; Consider the ESR and ESL of capacitors. Medical applications often have pulsed loads from: Motor drives in pumps and actuators; Display backlights; Communication bursts; Sensor sampling circuits. The converter's transient response is suitable for most medical device applications.

For applications with large load transients, add external output capacitance to improve transient response.

The MPS20-24S12 provides accurate output voltage for sensitive medical circuits: Initial accuracy is +/-1% at 25°C; Line regulation is +/-0.2% across input range; Load regulation is +/-0.5% from no load to full load; Temperature coefficient is +/-0.02%/°C; Overall accuracy is +/-2% over all conditions. The tight regulation is achieved through: Precision voltage reference; Feedback control with compensation; Temperature-compensated components; Careful PCB layout. For applications requiring even tighter accuracy: Use the trim feature to calibrate output; Consider temperature effects in your design; Add external linear regulation for critical circuits. The +/-2% accuracy is suitable for most medical analog and digital circuits. For critical measurements, verify that this accuracy meets your system requirements.

For precision analog circuits, verify output voltage accuracy meets your measurement requirements.

The MPS20-24S12 is rated for full 20W output from -40°C to +71°C ambient: Above 71°C, output power must be derated linearly; At 85°C ambient, maximum output is approximately 12W (60%); Derating is based on internal temperature rise; Natural convection cooling is assumed (no forced airflow). The thermal derating curve ensures: Internal components stay within safe temperature limits; Long-term reliability is maintained; MTBF ratings are achieved; Safety isolation is preserved. For high-temperature applications: Improve airflow if possible; Reduce load power; Use thermal vias and copper pours on PCB; Consider heatsink mounting if available. The converter includes overtemperature protection that shuts down at approximately 115°C internal temperature to prevent damage.

For high-temperature applications, calculate required derating or improve thermal management.

The MPS20-24S12 has low isolation capacitance for minimal leakage current: Isolation capacitance is typically 25pF; This low capacitance contributes to the ultra-low leakage current; Capacitance is measured between input and output; The low capacitance is achieved through transformer design. Isolation capacitance affects: Leakage current (higher capacitance = higher leakage); Common-mode noise coupling; EMI performance; High-frequency isolation. The 25pF capacitance is very low for a 20W converter. For comparison, typical industrial converters may have 100-500pF isolation capacitance. The low capacitance is one factor that enables the <2uA patient leakage current specification.

For applications sensitive to capacitive coupling, the low isolation capacitance minimizes leakage and noise coupling.

The MPS20-24S12 has high MTBF for reliable medical operation: MTBF is 1,600,000 hours at 25°C per MIL-HDBK-217F; At 40°C, MTBF is approximately 1,100,000 hours; At 50°C, MTBF is approximately 800,000 hours. The high reliability is achieved through: Conservative component derating; High-quality medical-grade components; 100% burn-in testing; Robust thermal design; Comprehensive protection circuits. For medical applications, high MTBF is important because: Device failure can affect patient care; Service access may be difficult or costly; Regulatory submissions require reliability data; Product liability considerations. P-Duke provides detailed reliability reports including: FIT rates for each component; Failure mode analysis; Accelerated life test data; Field reliability history. The MTBF calculation assumes ground benign environment; actual MTBF depends on operating conditions.

For life-support applications, request detailed reliability data and consider operating temperature effects on MTBF.