B_S-2WR2 Series
4 pin SIP Package, 2 Watt, Isolated, Unregulated
Features
4 pin SIP package
Input / Output Isolation Voltage: 1.5kVDC
High Efficiency
Lead Free Design, RoHS Compliant
Operating temperature: -40°C to +85°C
Optional Continuous Short Circuit Protection
Continuous Short Circuit Protection
Meet Safety Standard / Approval: IEC / EN60950-1
Applications
These converters are well suitable for battery operated
equipment, measurement equipment, telecom, wireless
network, Industry control system, everywhere where
isolated, tightly regulated voltages and compact size are
required.
Technical Specification All specifications are typical at nominal input, full load and 25°C unless otherwise stated.
Model
Number
Output
Voltage
(V)
5
Output Current (mA)
200
79
12
80
82
470
220
15
65
82
220
B0524S-2WR2
24
65
82
100
B1205S-2WR2
5
200
79
470
12
15
80
65
82
82
220
24
65
82
220
100
5
200
79
470
12
80
82
220
15
65
82
220
24
65
82
100
Input Voltage
Range(V)
B0505S-2WR2
B0512S-2WR2
B0515S-2WR2
B1212S-2WR2
B1215S-2WR2
B1224S-2WR2
4.5 ~ 5.5
Nominal: 5
10.8 ~ 13.2
Nominal: 12
B2405S-2WR2
B2412S-2WR2
B2415S-2WR2
B2424S-2WR2
21.6 ~ 26.4
Nominal: 24
Full Load
Efficiency .(2) (%)
Capacitive
Load, max. (uF)
Note
1. Io below this value will not damage these converters, however, they may not meet all listed specifications.
2. Typical value, tested at nominal input and full load.
3. For each output.
4. In case of long input lines or hot plug-in requirements, we recommended to use an external low ESR capacitor
(22uF) near to the converter's input pins.
5. Specifications subject to change without notice.
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Input Specifications
Input voltage
Input current at no load
Surge voltage (1 s max.)
Recommended input fuse
5 Vin models
4.5~5.5V
12Vin models
10.8~13.2V
24Vin models
21.6~26.4V
5 Vin models
35mA(typ.)
12Vinmodels
18mA(typ.)
24Vinmodels
10mA(typ.)
5 Vin models
9V(Max.)
12Vin models
18V(Max.)
24Vin models
30V(Max.)
5 Vin models
1A (slow-blow fuse)
12Vin models
0.4A (slow-blow fuse)
24Vin models
0.2A (slow-blow fuse)
Input filter
Capacitor
Environmental Specifications
Operating ambient temperature
Natural convection
-40°C to +85°C
Maximum case temperature
+95°C
Storage temperature range
-55°C to +125°C
Relative humidity
95% RH max.
Output Specifications
Output power
Voltage accuracy
(Nominal Vin and full load)
2 Watts max.
±3% at 60% load
±3% at 80% load
5VDC models
Other models
Minimum load
Regulation
0A
Input variation
Load variation
Ripple and Noise (20MHz Bandwidth)
±1.5% max.for Vin Change of 1%
See graphs below
120mVp-p typ.
250mVp-p max.
Maximum capacitive load
See table
Temperature coefficient
Short Circuit Protection
±0.02%/°C max.
Automatic recovery
Continuous
Efficiency
Nominal input and full load
See table
Isolation voltage(60s)
Input to output
Isolation resistance
500VDC
General Specifications
1500VDC
1GΩ min.
<20pF.
Isolation capacitance
Switching frequency
Start-up time
30K-200KHz.
≤10ms
Nominal Vin and full load
Reliability, calculated MTBF
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Physical Specifications
Case material
Plastic (UL94 V-0)
Potting material
Epoxy (UL94 V-0)
Dimensions
0.46 × 0.295 × 0.4 Inch
(11.6 × 7.5 × 10.2 mm)
Weight
1.6g (0.057oz) typ.
Pin material
Tinned copper
Output voltage variation dependent on load (at nominal input voltage)
Other Output
10
7.5
5
2.5
0
max.
-2.5
typ.
-5
min.
-7.5
-10
20%
40%
60%
80%
Deviation of Vout nom. (%)
Deviation of Vout nom. (%)
5VDC Output
10
7.5
5
max.
2.5
0
typ.
-2.5
min.
-5
-7.5
-10
100%
20%
40%
Load (%)
60%
80%
Load (%)
Power Derating Curve
Power Derating Curve
120
Output Power (%)
100
Natural
Convection
20LFM
80
60
40
20
0
-40
-20
0
20
40
60
80
95
100
120
Ambient Temp.TA (℃)
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100%
Mechanical Dimensions
Pin Assignment
Pin
1
2
3
Single
-Vin
+Vin
-Vout
4
+Vout
Unit: mm (inch)
Pin section tolerances:±0.1(±0.004)
General tolerances:±0.5(±0.02)
Test Configurations
All specifications are typical at nominal input, full load and 25°C unless otherwise stated.
A
DC
Power Supply
A
DC/DC
converter
V
V
Load
◎DC Power Supply: It offers a wide voltage and current range precisely.
◎Current meter (A): Accuracy200μA ~ 200mA 4 ranges+(0.2% rdg + 2 digits)
2000mA ~ 20A 2 ranges+(0.3% rdg + 2 digits).
◎Voltage meter (V): Accuracy+(0.03% rdg + 4 digits).
◎Load: At full load.
◎Wires: The resistance of the wires must be small.
1. Input voltage range: Narrow input voltage range(±10%)、wide input voltage range (2:1 and 4:1)。
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EX: Narrow input voltage range(±10%)
5V nominal input
4.5~5.5V
12V nominal input
10.8~13.2V
24V nominal input
21.6~26.4V
Wide input voltage range 2:1
5V nominal input
4.5~9V
12V nominal input
9~18V
24V nominal input
18~36V
48V nominal input
36~75V
Wide input voltage range 4:1 (W)
24V nominal input
9~36 V
48V nominal input
18~75V
2. Input power :
Pin = Vin x Iin
Vin:Input voltage
Iin:Input current
Pout = Vout x Iout
Vout:Output voltage
Iout:Output current
3. Output power :
4. Efficiency :
Efficiency =
Pout
Pin
x100%
Pout: Output power
Pin: Input power
5. Voltage accuracy:
│Vout-Vout(nominal)│
Vout
x100%
Vout:Output voltage
Vout(nominal):Nominal output voltage
6. Line regulation:
Narrow input voltage range(±10%)and unregulated output voltage series.
Line regulation=
ΔVout
ΔVin
ΔVout = Vout(+10%)-Vout(-10%) x100%
Vout
Vout(+10%):Output voltage at Vin = 1.1xVin(nominal)&full load
Vout(-10%):Output voltage at Vin = 0.9xVin(nominal)&full load
Vout:Output voltage at Vin = Vin(nominal)&full load
ΔVin = Vin(+10%)-Vin(-10%) x100%
Vin(nominal)
Vin(+10%):Input voltage = 1.1xVin(nominal)
Vin(-10%):Input voltage = 0.9xVin(nominal)
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Vin(nominal):Nominal Input voltage
7. Load regulation :
│Vout(FL)-Vout(NL)│ x100%
Vout(FL)
Vout(FL): Output voltage at full load
Vout(NL): Output voltage at 25% full load or 10% full load
8. Ripple and Noise: as shown below. The bandwidth is 0-20MHz.
Noise
Ripple&Noise
Ripple
Output Ripple&Noise measurement test circuit: as shown below.
Copper strip
DC/DC
converter
Co
Oscilloscope
Load
Copper strip
Co: usually 0.47uF.
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9. Temperature derating curve: The DC-DC converter will operate over a wider temperature range if less power
Output Power (%)
is drawn from the output and the device is already running. The temperature derating curve shows the operating
power-temperature range. As shown below.
120
100
80
60
40
20
0
85
-40
-20
0
20
40
60
80
100
120
Ambient Temp.TA (℃)
10. Switching frequency: The nominal operating frequency of the DC-DC converters.
11. Input to output isolation: The dielectric breakdown strength test between input and output circuits. This is the
isolation voltage the device is capable of withstanding for a specified time, usually 1 second or 1 minute.
12. Input souce impedance: The power module should be connected to low ac-impedance input souce.
Highly inductive souce impedances can affect the stability of the power module. In applications where power is
supplied over long lines and output loading is high , it maybe necessary to use a capacitor at the input to ensure
startup. Capacitor mounted close to the power module helps ensure stability of the unit , it is commended to use
a good quality low Equivalent Series Resistance ( ESR < 0.1Ω at 100KHz ) capacitor of a 22uF for the power
module.
DC
Power Supply
Cin
DC/DC
converter
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