DC SERIES
UP TO 20 WATTS - DC SERIES
SURFACE MOUNT CONVERTER
FEATURES:
•
•
•
•
•
•
•
•
Output trim function
Overvoltage protection
High efficiency (to 88%)
Six sided shield
Undervoltage lockout
Remote On/Off
Short-circuit protection
UL/CUL 1950, file #E155800
TO 20 WATTS
THE DC SERIES FROM WALL INDUSTRIES
The DC surface mount series offers the user a wide input
range and single output with tight regulation. These converters
are highly reliable and well suited for telecom applications.
SPECIFICATIONS: DC SERIES
All specifications apply at 25° C ambient unless otherwise noted.
INPUT SPECIFICATIONS
Input Voltage Range ........48V Nominal input ..........36-75VDC
Input Voltage Lockout ......DC-DC On............................36VDC
DC-DC Off............................33VDC
Input Filter (Note 1)......................................................L-C type
Input Voltage Variation .....dv/dt ..............................5V/ms, max
(complies with ETS300 132 part 4.4)
Input Surge Voltage .........48V Input (100mS max) .....100VDC
Input Reflected Ripple (Note 2) ..................................25mAp-p
(nominal Vin at full load)
Start Up Time ...................nom. Vin & const. res. load ....25mS
Remote On/Off (Note 3)...DC-DC On....Open or 3.5V<Vr<12V
DC-DC Off ......Short or 0V<Vr<1.2V
Remote off input current ..nominal Vin............................2.5mA
GENERAL SPECIFICATIONS
Efficiency (nominal input and full load).......................see table
Isolation voltage .................................................1600VDC, min
Isolation resistance .............................................109ohms, min
Isolation capacitance ..............................................500pF, max
Switching frequency...............................................300KHz, typ
Approvals & standards.................IEC60950,UL1950,EN60950
Potting material..............................................Epoxy (UL94-V0)
Dimensions...........................................1.95 x 1.19 x 0.38 Inch
Weight ...............................................................32.5g (1.15 oz)
MTFB (Note 5) .................................................1.632 x 106 hrs
ENVIRONMENTAL SPECIFICATIONS
Operating temp. range...................-40ºC ~ +85ºC(w/ derating)
Maximum case temp. ....................................................+100ºC
Storage temp. range ........................................-55ºC ~ +105ºC
Thermal impedence .........(natural convection) .........14ºC/Watt
Thermal shock...................................................MIL-STD-810D
Vibration ................10~55Hz, 2G, 30 minutes along X,Y and Z
Relative humidity ...............................................5% to 95% RH
OUTPUT SPECIFICATIONS
Output Power .....................................................20 Watts, max
Voltage accuracy..............full load and nominal Vin ..........±1%
Voltage adjustability..........................................................±10%
Minimum load.......................................................................0%
Line regulation..................LL to HL at Full Load .............±0.2%
Load regulation ................10% to 100% FL....................±0.5%
Ripple and noise (Note 4) .................2, 3.3V: 50mV, 75mVp-p
Temperature Coefficient .................................±0.02%/ ºC, max
Transient resp rec time ....(25% load step change) ........300uS
Over voltage protection ....2.0 & 3.3V output .....................3.9V
..(Zener diode clamp)
5V output ..................................6.2V
12V output .................................15V
15V output .................................18V
EMC CHARACTERISTICS
Conducted emissions.......EN55022 ..............................Level A
Radiated emissions..........EN55022 ..............................Level A
ESD..................................EN61000-4-2 .............Perf. Criteria2
Radiated immunity ...........EN61000-4-3 .............Perf. Criteria2
Fast transient ...................EN61000-4-4 .............Perf. Criteria2
Surge................................EN61000-4-5 .............Perf. Criteria2
Conducted immunity ........EN61000-4-6 .............Perf. Criteria2
Over load protection ....% of FL at nom out ...150% max
Short circuit protection .........Hiccup, automatic recovery
Due to advances in technology, specifications subject to
change without notice.
3/18/04
1
603 778 2300
WWW
.
WALLINDUSTRIES
.
COM
TO 20 WATTS
DC SERIES
Input Output
Voltage Voltage
(VDC) (VDC)
36-75
2.0
3.3
5
12
15
Output
Current
(A)
4
4
4
1.67
1.33
Model Efficiency
Number
(%)
DC48S2.0-8
DC48S3.3-13
DC48S5-20
DC48S12-20
DC48S15-20
82
84
88
88
87
PIN CONNECTIONS
1
2
3
4
5
6
7
8
9
10
11
12
+Vout
-Vout
N/C (Note 7)
Trim
N/C (Note 7)
N/C (Note 7)
N/C (Note 7)
Remote On/Off
Sync
N/C (Note 7)
-Vin
+Vin
NOTES:
1. An external filter capacitor is required for normal
operation. The capacitor should be capable of han-
dling 1A ripple current. We suggest: Nippon chemi-
con KMF series, 220
µ
F/100V, ESR 90Mohm
2. Simulated source impedance of 12
µ
H.
12
µ
H inductor in series with +Vin.
3. Remote On/Off is referenced to the negative input
(-Vin).
4. Measured with 104pF/50V MLCC.
Test conditions: nominal input and full load.
5. BELLCORE TR-NWT-000332. Case I: 50% Stress,
Temperature at 40ºC. (Ground fixed and controlled
environment).
6. We recommend solder paste volume of 2.8 cubic mm
(170,000 cubic mills/pin).
7. N/C pins may be used internally by the module and
should not be connected by the customer.
3/18/04
WWW
.
WALLINDUSTRIES
.
COM
603 778 2300
2
DC SERIES
TO 20 WATTS
OUTLINE DIAGRAM
Dimensions are in inches and (millimeters).
Tolerances: x.x ±0.02 in. (0.5 mm) - x.xx ±0.015 in. (0.4 mm)
3/18/04
3
603 778 2300
WWW
.
WALLINDUSTRIES
.
COM
