MICRODC WRA-YLS-3W

WRA-YLS-3W Series
WIDE INPUT,ISOLATED & REGULATED Dual Output SIP DC/DC Converter
SELECTION GUIDE
Input
Rated Output
Input
Effciency
Isolation
Voltage
Voltage
Min Load3
Full Load
Current2
(MIN.)
Capacitance
V (NOM.)
V
mA
mA
mA
%
pF
WRA2412YLS-3W
24
±12
±32
125
157
81
36
FEATURES
WRA2415YLS-3W
24
±15
±25
100
155
82
36
WRA4812YLS-3W
48
±12
±32
125
78
78
40
◆RoHS compliant
WRA4815YLS-3W
48
±15
±25
100
78
78
40
order code
Output Current
◆Compact SIP form factor
◆2:1 Wide range voltage input
INPUT CHARACTERISTICS
◆Continuous short circuit protection with
Parameter
Conditions
Min.
Typ.
Max.
Voltage range
All WRA24XX types
18
24
36
All WRA48XX types
36
48
72
All WRA24 types when 10µF at input
200
250
All WRA48 types when 10µF at input
105
150
current foldback
Operating temperature range –40
◆Operating
40°°C to +85
+85°°C
Refected ripple current
◆0.5% Load Regulation
Shutdown Power
◆ 1kVDC Isolation
VIN Nominal 24XX
8
VIN Nominal 48XX
16
Units
V
mA p-p
mW
◆ 24V & 48V nominal input
INPUT CHARACTERISTICS
◆ 12V & 15V Output
◆ Power density 1.00W/cm3
◆ Remote on/off
Parameter
Conditions
Voltage set point accuracy
Line regulation
With external input/output capacitors
Low line to high line with external
input/
output capacitors
Load regulation
Minimum load to rated load with
◆ No electrolytic capacitors
◆ Low noise
external input/output capacitors
Ripple
MODEL SELECTION
①
Min.
②
③
④
⑤
⑥
WR
WRA
A 24 12 Y LS -3W
①Product Series
②Input Voltage
③Output Voltage
④Wide (2:1) Input Range
⑤Lengthened SIP Package Style ⑥ Rated Power
PRODUCT OVERVIEW
The WRA-YLS-3W series is a range of high performance
miniature DC/DC converters having regulated outputs
over the wide temperature range of –40°C to +85°C. The
input voltage range is 2:1 and the input to output isolation
is 1kVDC. Continuous short circuit protection, external
control and extremely small SIP packaging provide state
of the art functionality. The use of ceramic capacitors and
a ceramic substrate, and SMD construction, provide
genuine high reliability. Nominal input voltages of 24 and
48V with output voltages of 12 and 15V are available as
standard with custom parts on request. The plastic case is
rated to UL 94V-0 with encapsulant to UL 94V-1.
Ripple & noise
BW = 20Hz to 300kHz with external
input/
output
capacitors
BW
= DC
to 20MHz with external
input/
Typ.
Max.
±1
±5
Units
%
0.05
0.2
%
0.2
0.5
%
15
30
mV rms
90
150
mV p-p
2.1
5.0
%
output
capacitors
%
voltage
change on negative output
Cross regulation
when positive load varies from 12% to
50% with negative load fxed at 50%
ABSOLUTE MAXIMUM RATINGS
Short-circuit protection
Continuous
Lead temperature 1.5mm from case for 10 seconds
300°C
Minimum output load for specifcation3
25% of rated output
Control pin input current
15mA
Input voltage 24 types1
40V
Input voltage 48 types1
80V
Free air space
10mm MIN. around component
1. Absolute maximum value for 30 seconds. Prolonged operation may damage the product.
2. Measured at full load with external input/output capacitors. Refer to application note.
3. A lower load condition can be used but higher levels of output ripple may be experienced, this condition may
also cause the output
voltage to exceed its specifcation transiently during power down when the input voltage also falls below its rated
minimum.
All specifcations typical at TA=25°C, Nominal input voltage and rated output current unless otherwise specifed.
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Technical Enquiries-Email:[email protected] Tel:0086-20-86000646
Page 1 of 4
WRA-YLS-3W Series
TEMPERATURE CHARACTERISTICS
Parameter
Conditions
MIN.
TYP.
-40
85
Operation
-40
100
Storage
-50
130
Case temperature rise above ambient
Units
MAX.
Specifcation
12V & 15V output types @ 100% load
°C
36
MTTF (MEAN TIME TO FAILURE)
Part Number
MTTF
WRA2412YLS-3W
2077
WRA2415YLS-3W
2080
WRA4812YLS-3W
2090
WRA4815YLS-3W
2045
Conditions
Units
Calculated using MIL-HDBK 217F with
kHrs
Nominal input at full voltage (ground
benign) at 25°C.
GENERAL CHARACTERISTICS
Parameter
Control pin (CTRL) input current
Switching frequency
Conditions
Please refer to control pin application note
MIN.
TYP.
6
MAX.
Units
15
mA
Load causing lowest frequencies, 100% load VIN MIN.
100
125
150
Load causing highest frequencies, 25% load VIN MAX.
300
400
500
MIN.
TYP.
MAX.
kHz
ISOLATION CHARACTERISTICS
Parameter
Conditions
Isolation test voltage
Flash tested for 1 second
Resistance
VISO = 1000VDC
Units
1000
1
VDC
GΩ
TECHNICAL NOTES
ISOLATION VOLTAGE
‘Hi Pot Test’, ‘Flash Tested’, ‘Withstand Voltage’, ‘Proof Voltage’, ‘Dielectric Withstand Voltage’ & ‘Isolation Test Voltage’ are all terms that relate to the same thing, a test
voltage, applied for a specified time, across a component designed to provide electrical isolation, to verify the integrity of that isolation.
MICRODC WRA-YLS-3W series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 1kVDC for 1 second.
A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?”
For a part holding no specific agency approvals, such as the WRA-YLS-3W series, both input and output should normally be maintained within SELV limits i.e. less than 42.4V
peak, or 60VDC. The isolation test voltage represents a measure of immunity to transient voltages and the part should never be used as an element of a safety isolation
system. The part could be expected to function correctly with several hundred volts offset applied continuously across the isolation barrier; but then the circuitry on both sides
of the barrier must be regarded as operating at an unsafe voltage and further isolation/insulation systems must form a barrier between these circuits and any user-accessible
circuitry according to safety standard requirements.
REPEATED HIGH-VOLTAGE ISOLATION TESTING
It is well known that repeated high-voltage isolation testing of a barrier component can actually degrade isolation capability, to a lesser or greater degree depending on
materials, construction and environment. The WRA-YLS-3W series has an EI ferrite core, with no additional insulation between primary and secondary windings of enameled
wire. While parts can be expected to withstand several times the stated test voltage, the isolation capability does depend on the wire insulation. Any material, including this
enamel (typically polyurethane) is susceptible to eventual chemical degradation when subject to very high applied voltages thus implying that the number of tests should be
strictly limited. We therefore strongly advise against repeated high voltage isolation testing, but if it is absolutely required, that the voltage be reduced by 20% from specified
test voltage.
This consideration equally applies to agency recognized parts rated for better than functional isolation where the wire enamel insulation is always supplemented by a further
insulation system of physical spacing or barriers.
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Technical Enquiries-Email:[email protected] Tel:0086-20-86000646
Page 2 of 4
WRA-YLS-3W Series
APPLICATION NOTES
External capacitance
Although these converters will work without external capacitors, they are neces-
Value
sary in order to guarantee the full parametric performance over the full line and load
CIN
COUT
range. All parts have been tested and characterized using the following values and
10µF, 200V
47µF, 25V
test circuit.
Value
Control Pin
The WRA-YLS-3W converters have a shutdown feature which enables the user to put the converter into a low power state. The control pin connects directly to the base of an
internal transistor. If the pin is left open (high impedance), the converter will be ON (there is no allowed low state for this pin), but once a control voltage is applied with
sufficient drive current, the converter will be switched OFF. A suitable application
circuit is shown below.
D1 (eg 1N4001) is required to provide high impedence when the signal is low.
From the WRA-YLS-3W specifcation, the drive current to operate this
function is recommended to be 6mA, and hence the value of R1 can be
derived as follows:
Cross Regulation
Load regulation is at its best when the positive and negative loads are balanced. When the loads are asymmetric, the negative output is not as tightly regulated as the
positive output. To meet ripple specifcation a total minimum load of 25% full load is required, however, the WRA-YLS-3W can be used with much lighter loading at the
expense of increased ripple. A small load is required on the negative output of 150mW to ensure the maximum negative output voltage is not exceeded.
Cross regulation is defined as change in the negative output voltage as a percentage of nominal as the positive output load is changed from 12.5% to 50% with the
negative load is fixed at 50% of full load.
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Technical Enquiries-Email:[email protected] Tel:0086-20-86000646
Page 3 of 4
WRA-YLS-3W Series
PACKAGE SPECIFICATIONS
MECHANICAL DIMENSIONS
PIN CONNECTIONS
MECHANICAL DIMENSIONS
Pin
Function
1
-VIN
2
+VIN
3
CTRL
6
+VOUT
7
0V
8
N/A
9
-VOUT
Package weight: 6.5g
N/A - Not available for electrical
Connection
All pins on a 0.1(2.54) pitch and within ±
0.01(0.25) of true position.
Unless otherwise stated all dimensions in
inches(mm) ±0.01(0.25).
RoHS COMPLIANT INFORMATION
This series is compatible with RoHS soldering systems with a peak wave solder temperature
of 300°C for 10 seconds.
The pin termination finish on the SIP package type is Tin Plate, Hot Dipped over Matte Tin
with Nickel Preplate. The DIP types are Matte Tin over Nickel Preplate. Both types in this
series are backward compatible with Sn/Pb soldering systems.
Microdc Professional Power Module,Inc.
Tel:0086-20-86000646
REACH COMPLIANT INFORMATION
E-mail:[email protected]
Website:http://www.microdc.cn
http://www.microdc.cn
This series has proven that this product does not contain harmful chemicals, it also has
harmful chemical substances through the registration, inspection and approval.
Technical Enquiries-Email:[email protected] Tel:0086-20-86000646
Page 4 of 4