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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 applications, 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: ±0.020 inches
X.XXX dimensions: ±0.005 inches
NOTES
(1) All parameters measured at Tc = 25°C, 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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NOTES
(1) All parameters measured at Tc = 25°C, 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 0.01µF 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 470F/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 recommended that 1F to 10F of tantalum and 0.001 to 0.1F
ceramic capacitance be selected for reduced system noise.
Operation below 50% output power may require the addition of
a 470F 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
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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°C, Vin=Nom VDC, Rated Load)
95
90
50% FULL LOAD
100% FULL LOAD
80
75
85
70
6
7 8 91011 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
62 1410 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
302010 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
302010 50 60 70 80 90 100
5.0 VOLT EFFICIENCY Vs. LOAD
LOAD (%)
EFFICIENCY (%)
50
0
5
10
15
20
60 70 80 9040
OUTPUT POWER DERATING
AMBIENT TEMPERATURE
POWER OUTPUT
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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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