ISOLATED DC/DC CONVERTERS 24 Vdc/48 Vdc Input SRQB-20U080 8 Vdc/2.5 A Output RoHS Compliant Rev.C • High Efficiency • Remote On/Off • Isolated • Output Voltage Trim • Low Cost • Input Under Voltage Lockout • Fixed Frequency (340 kHz) • SCP/OCP • Output Over Voltage Shut Down • Over Temperature Protection • Excellent Thermal Performance • Positive/Negative Remote Sense • Basic Insulation Description The SRQB-20U080 is an isolated dc/dc converter that operates from a nominal 24 Vdc and 48 Vdc source. This unit provides up to 20 W of output power from a nominal 24 Vdc and 48 Vdc input. This unit is designed to be highly efficient and low cost. Features include remote on/off, over current protection and under voltage lockout. The converter is provided in an industry standard quarter brick package. Part Selection Output Voltage 8.0 Vdc Input Voltage 14 Vdc - 65 Vdc Max. Output Current 2.5 A Max. Output Power 20 W Typical Efficiency 81% Model Number SRQB-20U080 Notes: 1. Add “G” suffix at the end of the model number to indicate Tray Packaging. 2. All part numbers above indicate RoHS 6. Change the second letter "R" to "7" for RoHS 5 part numbers. Absolute Maximum Ratings Parameter Input Voltage (continuous) Min -0.3 V Typ - Remote On/Off (Active High) -0.3 V - 12 V - - 2000 V Ambient Temperature -40 °C - 85 °C Storage Temperature -55 °C - 125 °C I/O Isolation Voltage Max 70 V Notes Input Specifications Parameter Input Voltage Input Current Input Current (no load) Remote Off Input Current Input Reflected Ripple Current (rms) Input Reflected Ripple Current (pk-pk) 2 I t Inrush Current Transient Turn-on Input Voltage Turn-off Input Voltage Min 14 V - Typ 40 mA 3 mA Max 65 V 2.5 A 150 mA 10 mA Notes - 5 mA 10 mA - 15 mA 30 mA With simulated source impedance of 10 uH, 5 Hz to20 MHz. And use a 100 uF/ 100 V electrolytic capacitor with ESR=1 ohm max, at 200 kHz. - 0.012 A s 0.024 A s 12.8 V 12.5 V 13.3 V 13.0 V 13.8 V 13.5 V 2 2 Note: All specifications are typical at 25 °C unless otherwise stated. Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com ISOLATED DC/DC CONVERTERS 24 Vdc/48 Vdc Input 8 Vdc/2.5 A Output Output Specifications Parameter Min Typ Max 7.84 V 8.0 V 8.16 V Line Regulation - ±3 mV ±10 mV Load Regulation - ±5 mV ±15 mV Temperature Regulation (-40 °C to +85 °C) - ±30 mV ±60 mV Ripple and Noise (rms) - 15 mV 30 mV Ripple and Noise (pk-pk) - 60 mV 100 mV 0A - 2.5 A 2.7 A 4.0 A Output Voltage Set Point Output Current Current Limit Threshold Vin=48 V, IO=50% full load 0-20 MHz BW, with a 1 µF ceramic capacitor and a 10 uF tantalum capacitor at the output. 5.5 A 2 2 Short Circuit Surge Transient - 0.7 A s 1.4 A s Turn on Time - 10 mS 25 mS Overshoot at Turn On - 0% 5% 0 uF - 330 uF Output Capacitance Notes Transient Response 50% ~ 75% Max Load Overshoot - 100 mV 300 mV Settling Time - 200 uS 400 uS 50% ~ 25% Max Load Overshoot - 100 mV 300 mV Settling Time - 200 uS 400 uS di/dt=0.1 A/us, Vin=48 Vdc, with a 1 uF ceramic capacitor and a 10 uF tantalum at the output. Note: All specifications are typical at nominal input, full load at 25°C unless noted. General Specifications Parameter Min Typ Max 77% 81% - Switching Frequency 300 kHz 340 kHz 380 kHz Isolation Capacitance - 1500 pF - Remote Sense Compesation - - 10% 7V - 9V Over Temperature Protection - 125 °C - Over Voltage Protection - 9.5 V - Efficiency Output Voltage Trim Range MTBF Notes Measured at Vin=48 V, full load Vin=48 V, Io=full load Calculated Per Bell Core SR-332 (IO = 80% IO max; Vin=48 V; Vo=8 V; Ta = 25 °C) TBD Dimensions Inches (L × W × H) Millimeters (L × W × H) Weight 2.3 x 1.45 x 0.391 58.42 x 36.83 x 9.93 - 26 g - Note: All specifications are typical at 25 °C unless otherwise stated. Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com ISOLATED DC/DC CONVERTERS 24 Vdc/48 Vdc Input 8 Vdc/2.5 A Output Control Specifications Parameter Min Typ Max Signal Low (Unit Off) -0.3 V - 0.8 V Signal High (Unit On) 3.5 V - 12 V Current Sink 0 mA - 12 mA Notes Remote On/Off (Active High) The remote On/Off pin open, Unit On. Output Trim Equations Equations for calculating the trim resistor (in kΩ) given the desired adjusted voltage (Vadj) and the nominal output voltage of the converter (Vnom) are shown below. The Trim Down resistor should be connected between the Trim pin and Vout. The Trim Up resistor should be connected between the Trim pin and Ground. Only one of the resistors should be used for any given application. Vout Rtrim _ down 59.2 = − 26 Vnom − Vadj 27.5 Rtrim _ up = − 15 Vadj − Vnom Rtrim_down Module Trim GND Vout Module Trim Rtrim_up GND Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com ISOLATED DC/DC CONVERTERS 24 Vdc/48 Vdc Input 8 Vdc/2.5 A Output Efficiency Data Efficiency Curve 85.0% Efficiency 80.0% 75.0% 18V 24V 48V 65V 70.0% 65.0% 60.0% 55.0% 50.0% 0.2A 0.75A 1.25A 1.75A Output Current(A) 2.5A Thermal Derating Curves Vin=24 V Vin=48 V Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com ISOLATED DC/DC CONVERTERS 24 Vdc/48 Vdc Input 8 Vdc/2.5 A Output Ripple and Noise Waveforms Ripple and noise at full load, 24 Vdc input, 8 Vdc/2.5 A output Ripple and noise at full load, 48 Vdc input, 8 Vdc/2.5 A output Note: Ripple and noise at full load, with a 1uF ceramic capacitor and a 10 uF tantalum capacitor at output, and Ta=25 deg C. Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com ISOLATED DC/DC CONVERTERS 24 Vdc/48 Vdc Input 8 Vdc/2.5 A Output Transient Response Waveforms Vout= 8 V 50%-75% Load Transients at Vin=24 V Vout= 8 V 50%-75% Load Transients at Vin=48 V Vout= 8 V 75%-50% Load Transients at Vin=24 V Vout= 8 V 75%-50% Load Transients at Vin=48 V Note: Load Transients at di/dt=0.1 A/us, Vin=48 Vdc, with a 1 uF ceramic capacitor and a 10 uF tantalum at the output, Ta=25 deg C. Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com ISOLATED DC/DC CONVERTERS 24 Vdc/48 Vdc Input 8 Vdc/2.5 A Output Mechanical Outline Pin Connections Pin Function Pin Size 1 Vin+ 0.079’’ 2 On/Off 0.079’’ 3 Vin- 0.079’’ 4 Vo- 0.10’’ 5 Sense- 0.079’’ 6 Trim 0.079’’ 7 Sense+ 0.079’’ 8 Vo+ 0.10’’ RoHS Compliance Complies with the European Directive 2002/95/EC, calling for the elimination of lead and other hazardous substances from electronic products. ©2007 Bel Fuse Inc. Specifications subject to change without notice. 010907 CORPORATE FAR EAST EUROPE Bel Fuse Inc. 206 Van Vorst Street Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com Bel Fuse Ltd. 8F/ 8 Luk Hop Street San Po Kong Kowloon, Hong Kong Tel 852-2328-5515 Fax 852-2352-3706 www.belfuse.com Bel Fuse Europe Ltd. Preston Technology Management Centre Marsh Lane, Suite G7, Preston Lancashire, PR1 8UD, U.K. Tel 44-1772-556601 Fax 44-1772-888366 www.belfuse.com