MCH2805S

FEATURES • • • • • • • -55°C to +125°C operation 12 to 50 VDC input Fully isolated Magnetic feedback Fixed frequency 370 kHz typ. Topology – Current Mode Flyback 80 V for up to 120 ms transient protection (70 V for 15 V single and dual models) • Inhibit function • Short circuit protection • Undervoltage lockout DC/DC CONVERTERS 28 VOLT INPUT MCH SERIES 1.5 WATT MODELS VDC OUTPUT SINGLES 5 5.2 12 15 DUALS ±5 ±12 ±15 Size (max.): 0.980 x 0.805 x 0.270 inches (24.89 x 20.45 x 6.86 mm) Weight: 12 grams max. Screening: Standard, ES, or 883 (Class H) DESCRIPTION With a miniature footprint of just 0.8 square inches, the MCH Series™ of DC/DC converters delivers 1.5 watts of output power while saving significant board real estate. The wide input voltage range of 12 to 50 VDC accepts the varying voltages of military, aerospace, or space bus power and tightly regulates output voltages to protect downstream components. Transient protection of 80 volts for up to 120 milliseconds exceeds the requirements of MIL-STD-704A for the 5, 5.2, and 12 volt single models and the 12 volt dual model. The 15 volt single and dual converters will withstand transients of up to 70 volts for up to 120 milliseconds. INHIBIT FUNCTION When an open collector TTL logic low is applied to the inhibit terminal, pin 7, the converter shuts down and lowers the output voltage to near zero and input current to as low as 2.3 mA. Leaving the terminal open or applying an open collector TTL logic high will enable the converter. PROTECTION FEATURES Undervoltage lockout prevents the MCH Series converters from operating below approximately 8 VDC input voltage to keep system current levels smooth, especially during initialization or re-start operations. All models include a soft-start function to prevent large current draw and minimize overshoot. The converters also provide short circuit protection by restricting the current. CONVERTER DESIGN MCH Series DC/DC converters incorporate a continuous flyback topology with a constant switching frequency of approximately 370 kHz. Current-mode pulse width modulation (PWM) provides output voltage regulation. Output error voltage is magnetically fed back to the input side of the PWM to regulate output voltage. Regulation is also affected by the load; refer to the Electrical Characteristics tables on the following pages. Dual models regulate the negative output with magnetic coupling to the positive output. Up to 80% of the total load may be on one output providing that the other output carries a minimum of 20% of the total load. The dual models can be used at double the output voltage by connecting the load between positive and negative outputs, leaving the common unconnected. (ex: MCH2805D can be used as a 10 VDC output.) POSITIVE 1 INPUT MIL-STD-461 Use Interpoint’s FMSA-461 EMI filter to pass the CE03 requirements of MIL-STD-461C. CONVENIENT PACKAGING The MCH Series converters are packaged in hermetically sealed, projection-welded metal cases which provide EMI/RFI shielding. + 0.47 µF typical +VIN FB + 3 POSITIVE OUTPUT INHIBIT 7 SHUTDOWN PWM CONTROLLER +VOUT + 4 OUTPUT COMMON 6 NEGATIVE OUTPUT DUAL MODELS ONLY INPUT COMMON 2 FIGURE 1: BLOCK DIAGRAM 1 MCH SERIES 1.5 WATT ABSOLUTE MAXIMUM RATINGS Input Voltage • 12 to 50 VDC Output Power • 1.5 W Capacitive Load • Single output models 200 µF • Dual output models 100 µF Lead Soldering Temperature (10 sec per lead) • 300°C Storage Temperature Range (Case) • –65°C to +150°C DC/DC CONVERTERS INHIBIT Inhibit – TTL Open Collector • Logic low (output disabled) 0.8 V max Inhibit pin current 1 mA max • Referenced to input common • Logic high (output enabled) open collector TYPICAL CHARACTERISTICS Output Voltage Temperature Coefficient • 100 ppm/°C typical Input to Output Capacitance • 100 to 170 pF typical Undervoltage Lockout • 8 V input typical Current Limit • 125% of full load typical Isolation • 100 megohm minimum at 500 V Audio Rejection 40 dB, typical Conversion Frequency (kHz) • 25°C, 300 min, 370 typ, 450 max • –55°C to +125°C 270 min, 370 typ, 470 max Inhibit Pin Voltage (unit enabled) • 7 to 12 V RECOMMENDED OPERATING CONDITIONS Input Voltage Range • 12 to 50 VDC continuous • 80 V for 120 msec transient (70 V for 15 V single and dual models) Case Operating Temperature (Tc) • –55°C to +125°C full power • –55°C to +135°C absolute Derating Output Power/Current (Tc) • Linearly from 100% at 125°C to 0% at 135°C Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified. SINGLE OUTPUT MODELS PARAMETER CONDITIONS OUTPUT VOLTAGE1 Tc = 25°C Tc = –55°C TO +125°C OUTPUT CURRENT VIN = 12 to 50 VDC OUTPUT POWER OUTPUT RIPPLE VOLTAGE LINE REGULATION LOAD REGULATION VIN = 12 TO 50 VDC 10 kHz - 2 MHz Tc = –55°C TO +125°C V = 12 TO 50 VDC IN Tc = –55°C TO +125°C 10% TO FULL LOAD Tc = –55°C TO +125°C 50% TO FULL Tc = –55°C TO +125°C CONTINUOUS TRANSIENT 120 ms NO LOAD Tc = –55°C TO +125°C FULL LOAD Tc = –55°C TO +125°C INHIBITED Tc = –55°C TO +125°C 10k Hz - 10 MHz Tc = –55°C TO +125°C Tc = 25°C Tc = –55°C TO +125°C POWER DISSIPATION Tc = –55°C TO +125°C RECOVERY Tc = -–55°C TO +125°C 50 %–100%– 50% LOAD TRANSIENT Tc = –55°C TO +125°C RECOVERY Tc =–55°C TO +125°C 12 TO 50 TO 12 V IN TRANSIENT Tc = –55°C TO +125°C RECOVERY Tc = –55°C TO +125°C DELAY Tc = –55°C TO +125°C OVERSHOOT Tc = –55°C TO +125°C MCH2805S MCH285R2S MCH2812S MCH2815S MIN TYP MAX MIN TYP MAX MIN TYP MAX MIN TYP MAX 4.95 5 5.05 5.15 5.2 5.25 11.88 12 12.12 14.85 15 15.15 4.80 5 5.20 5.00 5.2 5.40 11.52 12 12.48 14.40 15 15.60 — 300 0 — 288 0 — 125 0 — 100 mA 0 — — — — — — — — 12 0 — — — — — — — — 72 69 — — — — –400 –500 — — –400 –500 — — — — — — — 45 65 35 40 350 380 100 115 28 — 5.5 6.0 70 73 2.3 2.4 100 130 77 75 1.3 1.4 3.0 3.5 185 185 125 125 170 180 0.75 0.75 7 10 0 0 1.5 150 300 100 120 700 800 200 300 50 80 10 11 74 78 3.2 3.5 200 250 — — 2.0 2.3 12 15 400 500 500 600 400 500 3.0 4.0 20 40 100 150 0 — — — — — — — — 12 0 — — — — — — — — 72 69 — — — — –400 –500 — — — 45 65 35 40 350 380 100 115 28 — 5.5 6.0 70 73 2.3 2.4 100 130 77 75 1.3 1.4 3.0 3.5 185 185 125 125 1.5 150 300 100 120 700 800 200 300 50 80 10 11 74 78 3.2 3.5 200 250 — — 2.0 2.3 12 15 400 500 500 600 0 — — — — — — — — 12 0 — — — — — — — — 74 72 — — — — –700 –800 — — — 50 70 60 70 600 640 145 160 28 — 6.0 6.5 68 70 2.3 2.4 100 150 79 77 2.0 2.2 3.5 3.5 350 380 130 130 1.5 200 300 200 250 1300 1400 300 400 50 80 10 12 72 74 3.2 3.5 200 250 — — 3.2 3.5 15 20 700 800 500 600 0 — — — — — — — — 12 0 — — — — — — — — 74 72 — — — — –700 –800 — — — 1.5 UNITS VDC W mV p-p mV INPUT VOLTAGE NO LOAD TO FULL INPUT CURRENT INPUT RIPPLE CURRENT2 EFFICIENCY LOAD FAULT 3, 4 35 150 50 250 70 300 80 350 700 1500 760 1600 165 350 185 450 28 50 — 70 6.0 11 6.5 12 68 72 70 74 2.3 3.2 2.4 3.5 100 200 150 250 79 — 77 — 2.3 3.7 2.5 4.0 4.0 18 4.0 20 350 380 140 180 700 800 600 750 750 850 2.0 2.5 20 40 300 450 mV VDC V mA mA p-p % W ms STEP LOAD RESPONSE5 mV pk µs STEP LINE RESPONSE5 START-UP 0 TO 28 VDC –400 170 –500 180 — 0.75 — 0.75 — 7 — 10 — 0 — 0 400 –900 400 500 –1000 400 3.0 — 0.6 4.0 — 0.6 20 — 7 40 — 10 100 — 0 150 — 0 900 –750 400 1000 –850 450 2.5 — 0.47 3.0 — 0.5 20 — 7 40 — 10 250 — 0 350 — 0 mV pk ms ms mV pk See notes 1, 2, 3, 4, 5, and 6 on the following page. 2 DC/DC CONVERTERS DUAL OUTPUT MODELS PARAMETER 1 OUTPUT VOLTAGE OUTPUT CURRENT6 OUTPUT POWER OUTPUT RIPPLE VOLTAGE +VOUT –V OUT 7 8 MCH SERIES 1.5 WATT UNITS VDC mA W Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified. CONDITIONS Tc = 25°C Tc = –55°C TO +125°C VIN = 12 TO 50 VDC VIN = 12 TO 50 VDC 10 kHz - 2 MHz Tc = –55°C TO +125°C 10 kHz - 2 MHz Tc = –55°C TO +125°C VIN = 12 TO 50 VDC Tc = –55°C TO +125°C 10% TO FULL –55°C TO +125°C 50% TO FULL –55°C TO +125°C CONTINUOUS TRANSIENT 120 ms NO LOAD Tc = –55°C TO +125°C FULL LOAD Tc = –55°C TO +125°C INHIBITED Tc = –55°C TO +125°C 10 kHz - 10 MHz Tc = –55°C TO +125°C Tc = 25°C Tc = –55°C TO +125°C MCH2805D MIN TYP MAX ±4.95 ±5 ±5.05 ±4.80 ±5 ±5.20 0 ±150 240 0 — — — — — — — — — — 12 0 — — — — — — — — 73 70 — — — — –300 –400 — — –250 –300 — — — — — — — 35 50 35 50 10 20 300 350 80 100 28 — 5.0 6.0 69 72 2.3 2.4 100 130 77 75 1.4 1.6 3.7 3.8 130 140 100 100 125 130 0.6 0.6 8 10 0 0 1.5 150 250 150 250 50 100 600 700 200 300 50 80 10 12 73 77 3.2 3.5 200 250 — — 2.2 2.5 15 20 300 400 400 500 250 300 2.5 3.0 25 45 100 150 MCH2812D MCH2815D MIN TYP MAX MIN TYP MAX ±11.88 ±12 ±12.12 ±14.85 ±15 ±15.15 ±11.52 ±12 ±12.48 ±14.40 ±15 ±15.60 0 ±62.5 100 0 ±50 80 0 — — — — — — — — — — 12 0 — — — — — — — — 73 70 — — — — –600 –700 — — –500 –600 — — — — — — — 35 40 35 40 100 110 550 570 115 130 28 — 7.5 8.0 70 71 2.3 2.4 115 150 77 75 2.5 2.7 3.2 3.2 250 260 165 165 240 250 0.9 0.9 8 10 0 0 1.5 150 250 150 250 300 400 1100 1200 250 350 50 80 13 14 73 77 3.2 3.5 200 250 — — 3.8 4.2 15 20 600 700 700 800 500 600 3.0 4.0 25 45 250 350 0 — — — — — — — — — — 12 0 — — — — — — — — 72 69 — — — — –600 –700 — — –500 –600 — — — — — — — 30 35 30 35 165 180 600 630 125 135 28 — 7.5 8.0 71 72 2.3 2.4 90 120 76 74 2.7 3.0 4.0 4.0 250 270 50 50 220 230 0.6 0.7 8 10 0 0 1.5 150 250 150 250 500 650 1300 1400 300 400 50 70 13 14 74 78 3.2 3.5 200 250 — — 4.1 4.5 15 20 600 700 200 300 500 600 3.0 4.0 25 45 750 900 mV p-p LINE REGULATION mV LOAD REGULATION ±VOUT mV INPUT VOLTAGE NO LOAD TO FULL INPUT CURRENT VDC V mA INPUT RIPPLE CURRENT EFFICIENCY LOAD FAULT 2 mA p-p % W ms POWER DISSIPATION Tc = –55°C TO +125°C RECOVERY Tc = –55°C TO +125°C STEP LOAD 50 %–100%– 50% LOAD 5 TRANSIENT RESPONSE ± VOUT Tc = –55°C TO +125°C RECOVERY –55°C TO +125°C STEP LINE 12 TO 50 TO 12 VIN RESPONSE5 ± VOUT TRANSIENT Tc = –55°C TO +125°C RECOVERY Tc = –55°C TO +125°C START–UP DELAY 0 TO 28 VDC, ± VOUT Tc = –55°C TO +125°C OVERSHOOT Tc = –55°C TO +125°C 3,4 mV pk µs mV pk ms ms mV pk Notes: 1. Specified at 50% load. 2. Lin = 2 µH. 3. Maximum duration of short circuit: 25°C-– 90 seconds, 125°C – 30 seconds. 4. Load fault is a short circuit (