BRA20W Series 20130813A

Isolated DC-DC Converters
BRA20W Series -- 20 Watt
Bothhand USA
Features
Wide 4 : 1 Input Voltage Range(9~36V,18~75V)
High Efficiency up to 91%
Remote On/Off
Input / Output Isolation Voltage: 1.5K VDC
Extended Operating Temperature Range: -40°C to+85°C
Output Short Circuit Protection:
Hiccup, continuous & Auto Recovery
Over Voltage Protection: Clamp Mode
Description
Shielded Metal Case with Insulated Baseplate
The BRA20W Series are isolated 20W DC/DC converters.
Designed with highly efficiency, allow the operating
Lead Free Design, RoHS Compliant
temperature range of these units to be -40°C to +85°C (with
6 pin DIP Package with Industry-Standard Footprint
derating) in a 6 pin DIP package with industry-standard
Standard 1”X1” Package
footprint. Further features include wide 4 : 1 input voltage
range, remote on/off control, trimmable output, short-circuit
Customer Design Available
protection and over voltage protection.
Safety Standard / Approval : IEC / EN 60950-1
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
Model
Number
Input Voltage
Range
All specifications are typical at nominal input, full load and 25°C unless otherwise stated.
Output
Voltage
(V)
Output Current (mA)
Min. Load
(1)
Input Current (mA)
Full. Load
No Load
Full Load
Eff .
(%)
Capacitive
(3)
Load, max.
(uF)
(2)
BRA20-24S0W
3.3
0
4500
63
755
86
24700
BRA20-24S1W
5
0
4000
65
992
88
14700
12
0
1670
83
970
90
4700
BRA20-24S2W
9~36V
Nominal:24V
15
0
1330
70
967
90
2200
BRA20-24D2W
±12
±40
±833
60
992
88
2200
BRA20-24D3W
±15
±60
±667
83
981
89
1000
BRA20-48S0W
3.3
0
4500
29
373
87
32200
BRA20-24S3W
5
0
4000
30
490
89
23300
12
0
1670
38
486
90
3300
15
0
1330
32
477
91
1000
BRA20-48D2W
±12
0
±833
35
490
89
680
BRA20-48D3W
±15
0
±667
36
490
89
470
BRA20-48S1W
BRA20-48S2W
BRA20-48S3W
18~75V
Nominal:48V
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Rev:20130813A
Page 1 of 8
Isolated DC-DC Converters
BRA20W Series -- 20 Watt
Bothhand USA
Input Specifications
Input Voltage
24V nominal input
9-36V
48V nominal input
18-75V
Pi Type
Input filter
Input surge voltage
24V nominal input
50V
(100ms max.)
48V nominal input
100V
Input reflected ripple current
Nominal Vin and full load
Start up time
Nominal Vin and constant resistive load
Remote ON/OFF
60mAp-p max.
76ms typ.
Open or 3.5V<Vr<12V
Converter: ON
Short
Converter: OFF
(4)
or 0V<Vr<0.7V
Sourcing current of remote control pin
Nominal Vin
<0.2 mA
Idle input current (at Remote OFF state)
Nominal Vin
<12 mA
Environmental Specifications
-40°C to +85°C (with derating)
Operating ambient temperature
+105°C max.
Maximum case temperature
-55°C to +125°C
Storage temperature range
95% RH max.
Relative humidity
±0.02% / °C max.
Temperature coefficient
Output Specifications
20 Watts max.
Output power
Voltage accuracy
Full load and nominal Vin
±1%
See table
Minimum load
Line regulation
LL to HL at full load
25% load to full load
Load Regulation
Balanced load
±1.0%
Single
±1.0%
Dual
±0.5%
Unbalanced load 25% to 100% full load
Ripple and Noise
±5%
20MHz bandwidth
80mVp-p max.
3.3Vout models
3.9V
Over voltage protection
5.1Vout models
6.2V
(Zener Diode Clamp)
12Vout models
15V
15Vout models
18V
See table
Capacitive load
Over load protection
% of full load at nominal input
Short circuit protection
Transient response settling time
110% min.
Hiccup, continuous (Auto Recovery)
700µs max.
50% load step change
(1.4ms for 3.3Vout)
Transient response over shoot
≤ ±5% of Vo
di/dt=0.8A/µs
(≤ ±6% for 3.3Vout)
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Rev:20130813A
Page 2 of 8
Isolated DC-DC Converters
BRA20W Series -- 20 Watt
Bothhand USA
General Specifications
Efficiency
Nominal input
Isolation voltage
Input to output
Isolation resistance
See table
1500VDC
9
500VDVC
10 Ohms min.
Isolation capacitance
450pF typ.
Switching frequency
330kHz typ.
6
Reliability, calculated MTBF
0.35 × 10 Hrs
Physical Specifications
Case material
Nickel-coated copper
Base material
Non conductive FR4
Silicon rubber (UL94V-0)
Potting material
1.0 × 1.0 × 0.4 Inch
Dimensions
(25.4 × 25.4 × 10.2 mm)
Weight
19.2g (0.68oz) typ.
Power Derating Curve (Without Heatsink)
Power Derating Curve (With Heatsink)
120
Output Power (%)
Output Power (%)
120
100
80
60
40
20
0
-40
-20
0
20
40
50
100
80
60
40
20
0
60
80
100
120
-40
-20
0
Ambient Temp.TA (℃)
BRA20-48S1W
Efficiency %
Efficiency %
100
4
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3.6
Input voltage (V)
3.2
75
2.8
66
2.4
60
2
54
1.6
48
1.2
42
0.8
36
80
95
90
85
80
75
70
65
60
55
50
0.4
30
60
Output Current vs. Efficiency
95
90
85
80
75
70
65
60
55
50
24
40
BRA20-48S1W
Input voltage vs. Efficiency
18
20
Ambient Temp.TA (℃)
Output Current (A)
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Rev:20130813A
Page 3 of 8
120
Bothhand USA
BRA20-48S1W
Isolated DC-DC Converters
BRA20W Series -- 20 Watt
BRA20-48S1W
Transient Response at 50%~100% Max Load
Loop Gain & Phase at Vi=48V,Full Load
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. Short to -Vin (Pin 2).
Mechanical Dimensions
Pin
1
2
3
4
5
6
Pin Assignment
Single
Dual
+Vin
+Vin
-Vin
-Vin
+Vout
+Vout
Trim
Common
-Vout
-Vout
Remote On/Off
(optional)
Unit: mm [inch]
Tolerance:±0.5[0.02]
Specifications subject to change without noticed.
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Rev:20130813A
Page 4 of 8
Bothhand USA
Isolated DC-DC Converters
BRA20W Series -- 20 Watt
Heat-sink
Material: Aluminum
Weight:
4.2g (0.15oz)
Note:
The product label on converter has to be
removed before mounting the heat-sink.
For volume orders, converters will be supplied
with heat-sink already mounted. Please contact
factory for quotation.
Separate heat-sinks are only available for
prototypes and small quantity orders.
Specifications subject to change without notice.
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Rev:20130813A
Page 5 of 8
Isolated DC-DC Converters
BRA20W Series -- 20 Watt
Bothhand USA
Test Configurations
All specifications are typical at nominal input, full load and 25°C unless otherwise stated.
A
A
DC
Power Supply
DC/DC
converter
V
V
Load
◎DC Power Supply: It offers a wide voltage and current range precisely.
◎Current meter (A): Accuracy 200μA ~ 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)。
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 12V nominal input 24V nominal input 48V nominal input 4.5~9V
9~18V
18~36V
36~75V
Wide input voltage range 4:1 (W)
24V nominal input 9~36V
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
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x100%
Vout:Output voltage
Vout(nominal):Nominal output voltage
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Rev:20130813A
Page 6 of 8
Isolated DC-DC Converters
BRA20W Series -- 20 Watt
Bothhand USA
││││
││││
6. Line regulation: (1) Wide input voltage range and regulated output voltage series.
│Vout(LL)-Vout(HL)│
│
Vout(LL)
LL: Low Line input voltage
HL: High Line input voltage
x100%
(2) Narrow input voltage range(±10%)and unregulated output voltage series.
Δ Vout
Δ Vin
ΔVout = Vout(+10%)-Vout(-10%) x100%
Vout
Line regulation=
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)
Vin(nominal):Nominal Input voltage
7. Load regulation :
│ x100%
│Vout(FL)-Vout(NL)│
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.
Ripple&Noise
Noise
Ripple
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Isolated DC-DC Converters
BRA20W Series -- 20 Watt
Bothhand USA
Output Ripple&Noise measurement test circuit: as shown below.
Copper strip
DC/DC
converter
Co
Load
Oscilloscope
Copper strip
Co: usually 0.47uF.
9. Temperature derating curve: The DC-DC converter will operate over a wider temperature range if less 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
Output Power (%)
120
100
80
60
40
20
0
-40
-20
0
20
40
50
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.
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Rev:20130813A
Page 8 of 8
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