LWA20 - Polytron Devices, Inc.
POLYTRON DEVICES, Inc.
20 WATT
SINGLE OUTPUT
1" x 2" x 0.40" Package Specifications
Isolated, Wide Input (2:1)
DC/DC Converters
Typical at 25°C under full load and nominal input voltage, unless otherwise specified.
INPUT
FEATURES
• 20 Watts Output Power
• 1.5V, 1.8V, 2.5V, 3.3V,
5V, 12V, 15Vdc Output
• UL & CE Approved
• -40°C to +85°C
Operating Temp.
Range (with derating)
• Low Profile Package
(1.0" x 2.0" x 0.4")
• Input/Output Isolation
(1500Vdc min.)
• High Efficiency to
89% @ FL
• Short Circuit & OverVoltage Protection
• 6-Sided Continuous
Metal Shielding
• Epoxy Encapsulated
LWA20 Series
1.5V, 1.8V, 2.5V, 3.3V, 5V, 12V, 15Vdc Output 20 Watts Output Power
Input Voltages ........................................................................................................................................Voltage Range
24 Vdc .............................................................................................................................................18-36 Vdc
48 Vdc .............................................................................................................................................36-72 Vdc
Input Filter (Note 1) ..........................................................................................................................................L-C type
Input reflected ripple (Note 2) ...............................................................................Nominal Vin and full load 20mA p-p
Start up time Nominal Vin and contant resistor load.....................................................................................10mS, typ.
Remote on/off (Note 4)
DC-DC ON ..................................................................................................................Open or 3.5V<Vr<12V
DC-DC OFF ..................................................................................................................Short or 0V<Vr<1.2V
Remote OFF Input current ..............................................................................................................Nominal Vin 20mA
ENVIRONMENTAL
Operating Temperature Range ......................................................................................-40°C to +85°C (with derating)
Maximum Case Temperature ...........................................................................................................................+100°C
Storage Temperature Range ...................................................................................................................-55 to +105°C
OUTPUT
Voltage Accuracy ...........................................................................................................................................±1% max.
Line Regulation LL to HL at FL ...................................................................................................................±0.2% max.
Load Regulation 10% to 100% FL ..............................................................................................................±0.5% max.
Ripple and Noise (20 MHz BW).............................................................................................................75mV p-p max.
Temperature Coefficient (at FL)...........................................................................................................±0.02%/°C max.
Transient Response, recovery time 25% load step ..................................................................................300μms max.
GENERAL
Efficiency .......................................................................................................................................................See Table
Isolation Voltage .....................................................................................................................................1500 Vdc min.
Isolation Resistance ......................................................................................................10 9 Ohms, min. / 1000MOhms
Isolation Capacitance...............................................................................................................................1000pF, max.
Switching Frequency .................................................................................................................................500KHz, typ.
Over Voltage Protection ..................1.5V output............3.9V
Zener diode clamp
3.3V output ...........3.9V
15V output .............18V
1.8V output ..........3.9V
5V output .............6.2V
2.5V output ..............3.9V
12V output ................15V
Short Circuit Protection .....................................................................................................Hiccup, automatics recovery
Over Load Protection .............................................................................................% of FL at nominal input 150% typ.
ENVIRONMENTAL
Operating Temperature Range ......................................................................................-40°C to +85°C (with derating)
Maximum Case Temperature .............................................................................................................................100°C
Storage Temperature Range ...................................................................................................................-55 to +105°C
Thermal Impedance (Note 5) ...................Nature convection 12°C/Watt, Nature convection with heat sink 10°C/Watt
Thermal Shock.......................................................................................................................................MIL-STD-810D
Vibration .....................................................................................................10-55Hz, 2G, 30 minutes along X, Y and Z
Relative humidity ....................................................................................................................................5% to 95% RH
Cooling .........................................................................................................................................Free Air Convection
PHYSICAL
Case Material ..................................................................................Nickel Coated Copper with Non-Conductive Base
Weight ......................................................................................................................................1.5 oz. (42.52 grams)
Dimensions...........................................................................................1.00" x 2.00" x 0.40" (25.4 x 50.8 x 10.16 mm)
MTBF (Note 4) ...................................................................................................................................1.791 x 106 Hours
EMC CHARACTERISTICS
Conducted emissions
Radiated emissions
ESD
Radiated immunity
Fast transient
Surge
Conducted immunity
EN55022
EN55022
EN61000-4-2
EN61000-4-3
EN61000-4-4
EN61000-4-5
EN61000-4-6
Level A
Level A
Perf. Criteria2
Perf. Criteria2
Perf. Criteria2
Perf. Criteria2
Perf. Criteria2
NOTE:
1. An external filter capacitor is required for normal operation. The capacitor should be capable of handling 1A ripple current for
24V/48V models. Suggest: Nippon chemi-con KMF series, 220μ F/100V, ESR 90mΩ.
2. The negative / positive logic and pin length are optional (see table). The pin voltage is referenced to negative input.
3. Heat sink is optional.
4. The LWA20 meets level A & level B conducted emissions only with external components connected before the input pin to the converter.
5. Typical value at nominal input voltage and full load.
6. The converter is provided with basic insulation.
P.O. Box 398, Paterson, New Jersey 07544 U.S.A.
Tel: (973)345-5885 Fax: (973)345-1264 • Email: [email protected] • www.polytrondevices.com
20 Watt Single Output DC/DC Converters
LWA20 Series
Selection Guide
SINGLE OUTPUT VOLTAGE
Input Voltage
Nominal (Range)
(Vdc)
24 (18-36)
48 (36-72)
(Continued)
Output
Voltage
(Vdc)
1.5
1.8
2.5
3.3
5
12
15
1.5
1.8
2.5
3.3
5
12
15
Output
Current
(mA)
6000
6000
6000
5000
4000
1670
1330
6000
6000
6000
5000
4000
1670
1330
Efficiency Model Number
%
79
82
84
86
88
87
87
80
83
85
87
89
88
87
LWA20-24S1.5
LWA20-24S1.8
LWA20-24S2.5
LWA20-24S33
LWA20-24S5
LWA20-24S12
LWA20-24S15
LWA20-48S1.5
LWA20-48S1.8
LWA20-48S2.5
LWA20-48S33
LWA20-48S5
LWA20-48S12
LWA20-48S15
Case
Capacitor
Load (Max)
P
P
P
P
P
P
P
P
P
P
P
P
P
P
65000μF
65000μF
33000μF
13000μF
6800μF
2200μF
755μF
65000μF
65000μF
33000μF
13000μF
6800μF
2200μF
755μF
Mechanical Specifications
Case P
I/O CONNECTIONS
PIN
SINGLE
1
+Vin
2
–Vin
3
+Vout
4
TRIM
5
–Vout
6
CTRL + LOGIC
All Dimensions are in inches (mm)
POLYTRON DEVICES, Inc.
P.O. Box 398, Paterson, New Jersey 07544 U.S.A.
Tel: (973)345-5885 Fax: (973)345-1264 • Email: [email protected] • www.polytrondevices.com
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