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DSN17 SERIES
SINGLE OUTPUT
DESCRIPTION With power densities up to 25 watts per cubic inch (1.53 watts per cm3), the DSN17 Series delivers 3.5 amperes of current at either 5 or 3.3 volts. Designed for digital and microprocessor applications, the non-isolated flat package requires only 1 square inch (6.45 cm2) 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
FRONT VIEW 2.00 (50.80)
RIGHT VIEW 0.50 (12.70)
0.75 (19.05) 12345 6789 0.000 0.2 (5.08) TYP 0.24 (6.10) 0.000
0.14 (3.6) 0.000 0.100 (2.54) 0.200 (5.08)
0.300 (7.62) 0.400 (10.16)
1.400 (35.56)
0.025 (0.64) SQ PIN 9 PLACES
Mechanical tolerances unless otherwise noted: X.XX dimensions: 0.020 inches X.XXX dimensions: 0.005 inches
NOTES (1) All parameters measured at Tc = 25C, 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
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1.500 (38.10) 1.600 (40.64) 1.700 (43.18)
DSN17 SERIES - SINGLE OUTPUT
NOTES
(1) All parameters measured at Tc = 25C, 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. 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 0.01F ceramic capacitor located 1 inch away from the converter. The worst case output voltage includes line, load and temperature effects. Short term stability is defined as the drift over 24 hours with constant line, load and ambient temperature conditions. Requires a 470 F/16V capacitor across output terminals.
(2)
required for operation above 50% output power, however it is recommended 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.
(3) (4) (5)
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
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DSN17 SERIES - SINGLE OUTPUT
DSN17 SERIES BLOCK DIAGRAM
OUTPUT POWER DERATING 20
+ INPUT 2 HIGH EFFICIENCY CURRENT MODE STEP DOWN REGULATOR + INPUT 3
8 + OUTPUT
15
9 + OUTPUT
POWER OUTPUT
10
- INPUT 4
6 - OUTPUT
5
- INPUT 5
7 - OUTPUT 1
ON/OFF
0 40
60 70 80 50 AMBIENT TEMPERATURE
90
Typical Performance: (Tc=25C, Vin=Nom VDC, Rated Load)
3.3 VOLT EFFICIENCY Vs. LOAD
95 90
3.3 VOLT EFFICIENCY Vs. LINE INPUT VOLTAGE
95 90 50% FULL LOAD
3.3 VOLT INPUT CURRENT Vs. LINE INPUT VOLTAGE
3.5
INPUT CURRENT (AMPS)
3.0 2.5 2.0 1.5 1.0 0.5 0.0 0 1 2 3 4
100% LOAD
EFFICIENCY (%)
85 80 75 70 0 10 20 30 40 50 60 70 80 90 100
EFFICIENCY (%)
85 100% FULL LOAD 80 75 70 4.0
50% LOAD
4.5
5.0
5.5
6.0
5
6
LOAD (%)
LINE INPUT (VOLTS)
LINE INPUT (VOLTS)
5.0 VOLT EFFICIENCY Vs. LOAD
95 90
3.3 VOLT EFFICIENCY Vs. LINE INPUT VOLTAGE
95 50% FULL LOAD 90
5.0 VOLT INPUT CURRENT Vs. LINE INPUT VOLTAGE
3.5
INPUT CURRENT (AMPS)
3.0 2.5 2.0 1.5 1.0 50% LOAD 0.5 0.0 0 2 4 6 8 10 12 14 16 100% LOAD
EFFICIENCY (%)
EFFICIENCY (%)
100% FULL LOAD 85 80 75 70
85 80 75 70 0 10 20 30 40 50 60 70 80 90 100
6
7
8
9
10
11
12
13
14
15
LOAD (%)
LINE INPUT (VOLTS)
LINE INPUT (VOLTS)
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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 depending on the date manufactured. Specifications are subject to change without notice.
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