1 description with power densities up to 25 watts per cubic inch (1.53 watts per cm 3 ), the dsn17 series delivers 3.5 amperes of current at either 5 or 3.3 volts. designed for digital and microprocessor applica- tions, the non-isolated flat package requires only 1 square inch (6.45 cm 2 ) of pcb area. remote on/off gives additional system flexibility. the 100khz operating frequency of the dsn17 series allows an increased power density while including adequate heat sinking and input/output filtering. this eliminates the need for external components in some applications. the series?input range and no load input current (5ma) makes it well suited for battery operation in commercial and industrial applications. full overload protection is provided by pulse-by-pulse current limiting. features up to 17 watts output power single in line package power density up to 25 watts per cubic inch efficiencies to 88% (lower for 3.3v output) high efficiency step down regulator remote on/off dsn17 series single output 1.700 1.600 1.500 1.400 0.400 0.300 0.200 0.14 0.000 0.75 2.00 (3.6) 0.100 (2.54) (10.16) (7.62) (5.08) (35.56) (38.10) (40.64) (43.18) (50.80) (19.05) front view 0.24 0.000 0.2 (5.08) typ 0.000 0.50 (6.10) (12.70) right view 0.025 (0.64) sq pin 9 places 12345 6789 mechanical tolerances unless otherwise noted: x.xx dimensions: ?.020 inches x.xxx dimensions: ?.005 inches notes (1) all parameters measured at tc = 25?, nominal input voltage and full rated load unless otherwise noted. refer to the technical reference section for the definition of terms, measurement circuits and other information. (2) the functional temperature range is intended to give an additional data point for use in evaluating this power supply. at the low functional temperature the power supply will function with no side effects, however, sustained operation at the high functional temperature will reduce expected operational life. the data sheet specifications are not guaranteed beyond the case operating range. (3) the case thermal impedance is specified as the case temperature rise over ambient per package watt dissipated. rev. 04/2000
2 notes (1) all parameters measured at tc = 25?, nominal input voltage and full rated load unless otherwise noted. refer to the technical reference section for the definition of terms, measurement circuits and other information. (2) noise is measured per technical reference section. measurement bandwidth is 0-20 mhz. rms noise is measured over a 0.01-1 mhz bandwidth. to simulate standard pcb decoupling practices, output noise is measured with a 1 f tantalum and 0.01? ceramic capacitor located 1 inch away from the converter. (3) the worst case output voltage includes line, load and temperature effects. (4) short term stability is defined as the drift over 24 hours with constant line, load and ambient tempera- ture conditions. (5) requires a 470 f/16v capacitor across output terminals. dsn17 series application notes: external capacitance requirements no external input capacitance is required for operation of the dsn17 series. to meet the reflected ripple requirements of the converter, an input impedance of less than 0.075 from dc to 100khz is required. if a capacitive input source is farther than 2 from the converter, an additional capacitor may be required at the input pins for proper operation. external output capacitance is not required for operation above 50% output power, however it is rec- ommended that 1 f to 10 f of tantalum and 0.001 to 0.1 f ceramic capacitance be selected for reduced system noise. operation below 50% output power may require the addition of a 470 f capacitor to meet noise specifications. negative outputs due to the non-isolated nature of the dsn17 series, generation of negative output voltages is not possible. remote on/off operation the remote on/off pin should be tied to the -input pin if this function is not used. it is recommended to drive this pin with a cmos or ttl gate. an open collector output may be used with a 2.2k to 50k resistor tied to +input. when the on/off pin is pulled low with respect to the -input, the converter is placed in a low power drain state. the input capacitors are kept fully charged in the off mode. the off state current is typically less than 5ma. dsn17 series ?single output
3 dsn17 series block diagram + output + output ?output ?output ?input + input + input 2 3 8 4 ?input 5 on/off 1 6 9 7 high efficiency current mode step down regulator typical performance: (tc=25?, vin=nom vdc, rated load) 95 90 50% full load 100% full load 80 75 85 70 6 7 8 910 11 12 13 14 15 3.3 volt efficiency vs. line input voltage line input (volts) efficiency (%) 3.5 3.0 2.0 2.5 1.0 1.5 0.5 0.0 08 4 100% load 50% load 6 2 14 10 12 16 5.0 volt input current vs. line input voltage line input (volts) input current (amps) 95 90 50% full load 100% full load 80 75 85 70 4.0 4.5 5.0 5.5 6.0 3.3 volt efficiency vs. line input voltage line input (volts) efficiency (%) 3.5 3.0 2.0 2.5 1.0 1.5 0.5 0.0 03 4 100% load 50% load 1 2 56 3.3 volt input current vs. line input voltage line input (volts) input current (amps) 95 90 80 75 85 70 040 30 20 10 50 60 70 80 90 100 3.3 volt efficiency vs. load load (%) efficiency (%) dsn17 series ?single output 95 90 80 75 85 70 040 30 20 10 50 60 70 80 90 100 5.0 volt efficiency vs. load load (%) efficiency (%) 50 0 5 10 15 20 60 70 80 90 40 output power derating ambient temperature power output www.power-one.com www.power-one.com for the most up-to-date information 24 hours/day? days/week nuclear and medical applications power-one products are not authorized for use as critical components in life support systems , equipment used in hazardous environments, or nuclear control systems without the express written consent of the president of power-one, inc. technical revisions the appearance of products, including safety agency certifications pictured on labels, may change dependin g on the date manufactured. specifications are subject to change without notice.
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