W9959_02_DCDC_001-073_73 2/8/02 3:38 PM Page 42 Total Power: 100 Watts Input Voltages: 48V 100 Watts No. of Outputs: Dual ALH25-Dual Electrical Specs Input Input range 36 to 75 VDC (48Vdc Nom.) Efficiency 88% typical Input reverse Voltage protection Fuse recommended 3A.MB Input surge voltage 100V for 100mS Output Voltage tolerance ± 1% Line regulation ±0.2% Load regulation ±0.5% Special Features Ripple/noise 200mV P-P • 100W Output loadsharing Temperature coefficient +0.02%/°C (max) • 48VDC Input Transient response 3% Vo max recovery <500msec • Open Frame 2.3” x 2.4” x 0.50” pkg. (50% to 75% step load change) • -40 to 120°C board temperature Switching frequency 250 kHz typical • Trim feature, both rails • Industry standard pin-out Control • Enable (on/off) (pos or neg logic) Enable on =1.2Vdc Max (Neg Enable) • OC, OV, OT protection off = 3Vdc Min (Neg Enable) • 5.0V/3.3V dual outputs Ref. to -Vin. TTL compatible Input current (enable off) <2ma. Output trim Both outputs ±10% minimum Environmental Isolation I/O isolation 1500 VDC Operating PCB temperature range: -40°C to +120°C Storage temperature: -55°C to +125°C Weight 80 grams Safety UL UL 1950 Pending CAN22.2-950 Pending TUV EN60950 Pending 42 America’s (USA): 1-888-41-ASTEC Europe (UK): 44 (1384) 842-211 Asia (HK): 852-2437-9662 Astec Industry Standard ALH25-Dual Astec Industry Standard W9959_02_DCDC_001-073_73 2/8/02 3:38 PM Page 43 EUROPE ASIA AMERICAS Astec House, Waterfront Business Park Units 2111-2116, Level 21 5810 Van Allen Way Merry Hill, Dudley Tower1, Metroplaza Carlsbad, CA 92008 West Midlands, DY5 1LX, UK 223, Hing Fong Road Telephone: 760-930-4600 Telephone: 44 (1384) 842-211 Fwai Fong, New Territories Facsimile: 760-930-0698 Facsimile: 44 (1384) 843-355 Hong Kong Telephone: 852-2437-9662 Facsimile: 852-2402-4426 Ordering Information Input Output 1 Output 2 Model Number Voltage Voltage Voltage 36 - 75VDC 5.0V @ 20A 3.3V @ 25A ALH25AF48 Note: Enable Function "N" = negative logic enable (without "N" = positive enable) 1. Maximum output power not to exceed 100W total for 5/3.3V version 20/25A). 2. Any output loading ratio within the maximum specified limits is possible. Pin Assignments Dual Output 1. -Vin 2. Case 3. Control (on/off) 4. Vin+ 5. V2 6. Rtn (V2) 7. Trim (V2) 8. V1 9. Rtn (V1) 10. Trim (V1) Notes: 1. 20MHz bandwidth. An external 2.2mf ceramic capacitor is recommended to be placed from +V out to -V out. 2. Recommended External components below: C1 = 100uF/100V, C2=C4= metallic film .47uF/50V C3= C5 = Electrolytic 1000uF/10V, C6 = .01uF/1500V 3. All specifications are typical at nominal line, full load, and 25°C unless otherwise noted. 4. All specifications subject to change without notice. Mechanical drawings are for reference only. 5. Please refer to the Technical Reference Notes for more information. 6. Warranty: 1 yr www.astec.com 43