SMHF Datasheet | INTERPOINT

FEATURES - Fully qualified to Class H or K - Radiation hardened - - 55° to +125°C operation - 16 to 40 VDC input - Fully Isolated - Red hard optocoupler feedback MODELS - Fixed frequency, 550 k Hz typical VDC OUTPUT - Topology - Single Ended Forward SINGLE DUAL - Transient protection 50 V/120 ms 3.3 ±5 - Inhibit function 5 ±12 - Sync function 12 ±15 15 - Indefinite short circuit protection - Undervoltage lockout Size (max.): Non flanged 1.460 x 1.130 x 0.330 (37.08 x 28.70 x 8.38 mm) - Up to 84% efficiency DC/DC CONVERTERS 28 VOLT INPUT SMHF SERIES SINGLE AND DUAL 15 WATT Flanged 2.005 x 1.130 x 0.330 (50.93 x 28.70 x 8.38 mm) See Figures 21 through 24 for dimensions. Weight: 30 grams maximum. Screening: Standard, Class H, or Class K (MIL-PRF-38534) Radiation hardness levels O, L, and R DESCRIPTION The SMHF Series™ of 28 V DC/DC converters offers a wide input voltage range of 16 to 40 volts and up to 15 watts of output power. The units are capable of withstanding short term transients up to 50 volts. The package is a hermetically sealed, seam-welded metal case. Flanged and non-flanged models are available. step load transient is as low as 1.3% with a 150 msec recovery time. Input ripple current is typically 35 m A p-p with output ripple voltage typically 30 m V p-p . INHIBIT FUNCTION SMHF converters provide an inhibit terminal that can be used to disable internal switching, resulting in no output and very low quiescent input current. The converter is inhibited when a TTL patible low (≤0.8 - output disabled) is applied to the inhibit pin. The unit is enabled when the pin, which is internally connected to a pull-up resistor, is left unconnected or is connected to an open-collector gate. The open circuit output voltage associated with the inhibit pin is 8.5 to 12 VDC. In the inhibit mode, a maximum of 12 m A must be sunk from the inhibit pin at 28 VDC input. SCREENING AND REPORTS SMHF converters offer three screening options (Standard, Class H, or Class K) and three...