BUC20W Series 20130814A

PRELIMINARY
Isolated DC-DC Converters
BUC20W Series -- 20 Watt
Bothhand USA
Features
Wide 4 : 1 Input Voltage Range(9~36V,18~75V)
High Efficiency up to 90%
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 BUC20W 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 2”X1” Package
footprint. Further features include wide 4 : 1 input voltage
range, remote on/off control, trimmable output, short-circuit
Customer Design Available
protection, over voltage protection and over temperature
protection.
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
0
5500
70
945
Eff .
(%)
Capacitive
(3)
Load, max.
(uF)
84
33000
(2)
BUC20-24S0W
3.3
BUC20-24S1W
5.1
0
4000
86
1012
88
18000
BUC20-24S2W
12
150
1670
38
1006
87
3300
15
80
1330
49
990
88
2200
BUC20-24D1W
±5
0
±2000
91
992
88
8200
BUC20-24D2W
±12
±25
±835
45
1006
87
1000
BUC20-24D3W
±15
0
±665
95
1002
87
900
BUC20-48S0W
3.3
0
5500
25
461
86
33000
BUC20-48S1W
5.1
0
4000
38
500
89
18000
BUC20-48S2W
12
90
1670
40
491
89
3300
15
55
1330
37
489
89
2200
±5
0
±2000
39
484
90
8200
491
89
1000
495
88
900
BUC20-24S3W
BUC20-48S3W
9~36V
Nominal:24V
18~75V
Nominal:48V
BUC20-48D1W
BUC20-48D2W
±12
±10
±835
42
BUC20-48D3W
±15
0
±665
43
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Rev:20130814A
Page 1 of 7
PRELIMINARY
Isolated DC-DC Converters
BUC20W Series -- 20 Watt
Bothhand USA
Input Specifications
Input Voltage
24V nominal input
9-36V
48V nominal input
18-75V
Input filter
Pi Type
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
100mAp-p typ.
80ms 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
<15 mA
Environmental Specifications
-40°C to +85°C (with derating)
Operating ambient temperature
+100°C
Maximum case temperature
-55°C to +105°C
Storage temperature range
95% RH max.
Relative humidity
±0.02% / °C max.
Temperature coefficient
Output Specifications
20.4 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
±0.5%
Single
±0.5%
Dual
±0.5%
Unbalanced load 25% to 100% full load
Ripple and Noise
±3%
20MHz bandwidth
85mVp-p max.
(Measured with a 2.2uF/50V MLCC)
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)
300µs typ.
50% load step change
(1.8ms for 3.3Vout)
Transient response over shoot
≤ ±5% of Vo
di/dt=0.8A/µs
(≤ ±8% for 3.3Vout)
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Rev:20130814A
Page 2 of 7
PRELIMINARY
Isolated DC-DC Converters
BUC20W Series -- 20 Watt
Bothhand USA
General Specifications
Efficiency
Nominal input
Isolation voltage
Input to output
Isolation resistance
See table
1500VDC
9
500VDC
10 Ohms min.
Isolation capacitance
1200pF typ.
Switching frequency
300kHz typ.
6
Reliability, calculated MTBF
1.06 × 10 Hrs
Physical Specifications
Case material
Nickel-coated copper
Base material
Non-conductive black plastic
Silicon rubber (UL94V-0)
Potting material
2.0 × 1.0 × 0.4 Inch
Dimensions
(50.8 × 25.4 × 10.2 mm)
Weight
32.0g (1.13oz) typ.
BUC20W Series
Power Derating Curve(5)
120
Output Power (%)
100
80
70
60
40
20
0
-40
-20
0
20
40
60 70 80
105
120
Ambient Temp.TA (℃)
BUC20-48S1W
Output Current vs. Efficiency
Efficiency (%)
Efficiency (%)
BUC20-48S1W
Input voltage vs. Efficiency
Input voltage (V)
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Output Current (A)
Rev:20130814A
Page 3 of 7
PRELIMINARY
Isolated DC-DC Converters
BUC20W Series -- 20 Watt
Bothhand USA
BUC20-48S1W
BUC20-48S1W
Transient Response at 50%~100% Max Load
Loop Gain & Phase at Vi=48V,Full Loa
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).
5. Based on BUC20-48S1W.
Mechanical Dimensions
Pin
1
2
3
4
5
6
Pin Assignment
Single
Dual
+Vin
+Vin
-Vin
-Vin
Remote On/Off
+Vout
-Vout
Trim
+Vout
Common
-Vout
Unit: mm [inch]
Tolerance:±0.5[0.02]
Specifications subject to change without noticed.
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Rev:20130814A
Page 4 of 7
PRELIMINARY
Isolated DC-DC Converters
BUC20W 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:20130814A
Page 5 of 7
PRELIMINARY
Isolated DC-DC Converters
BUC20W 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.
Line regulation=
Δ Vout
Δ Vin
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)
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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Rev:20130814A
Page 6 of 7
PRELIMINARY
Isolated DC-DC Converters
BUC20W Series -- 20 Watt
Bothhand USA
Output Ripple&Noise measurement test circuit: as shown below.
Copper strip
DC/DC
converter
Co
Oscilloscope
Load
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
70
60
40
20
0
-40
-20
0
20
40
60 70 80
105
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:20130814A
Page 7 of 7
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