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bdeytnae
Key Features
Efficiency up to 87%
Low output noise
Six-sided shielding
Output synchronous rectification
Input-to-output isolation
Soft start
External synchronization
Short circuit protection
Thermal protection
Industry standard pinout
Q25
25-30W DC/DC Converter
2”×1”×0.45”
Low Noise, 4 to 1 Input Range, Single & Dual
Models
1
2
bdeytnae
9
8
3 Q25S12/48 7
4 MADE IN USA 6
5
Beta Dyne is protected under various patents, including but not limited to U.S. Patent numbers: 5,777,519; 6,188,276; 6,262,901; 6,452,818; 6,473,3171.
Functional Description
The Q25 series is a 25-30W low noise isolated converter, consisting of 14 standard single & dual output models
from 3.3VDC to 15 VDC and 4:1 input voltage range from 9V to 72V. Output synchronous rectification followed
by a very low dropout linear regulator made possible to achieve up to 87% efficiency and less than 5mV output
noise with external capacitors. Standard features include input undervoltage protection , external synchroniza-
tion and thermal protection. The converter is packaged in a 1 x 2 x .45’’ metal case with six-sided shielding.
BETA DYNE INC • WWW.BETA-DYNE.COM
Typical Block Diagram
Q25 DC/DC CONVERTER • Q25_DS_RevA.PDF • PAGE 1 OF 9
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Electrical Specifications
INPUT SPECIFICATIONS
PARAMETER
Input Voltage Range
Input Startup Voltage 24 VIN
Input Startup Voltage 48 VIN
Overvoltage Shutdown 24 VIN
Overvoltage Shutdown 48 VIN
Input Filter
No Load Input Current
Full Load Input Current
Input Surge Current (20µS Spike)
Short Circuit Current Limit
Off State Current
Remote ON/OFF Control
Supply ON
Supply OFF
Logic Input Reference
Logic Compatability
Unless otherwise specified, all parameters are given under typical ambient tem-
perature of +25°C with an airflow rate = 400LFM. With the given power derating, the
operating range is -40°C to +125°C. Specifications subject to change without notice.
CONDITION / NOTE
See model selection guide
LC
See model selection guide
See model selection guide
120% Of I @ Full Load
in
Pin 1 Open (Open circuit voltage: 10V Max.)
TTL Open Collector or CMOS Open Drain
MIN TYP MAX UNIT
Vdc
8 9 Vdc
14 17 Vdc
37 Vdc
73 Vdc
mA
A
10 A
150 µA
0 0.6 Vdc
OUTPUT SPECIFICATIONS
PARAMETER
Voltage
Output Voltage Accuracy
Output Current
Output Voltage Adjustment
Ripple & Noise
Line Regulation
Load Regulation
Temperature Coefficient @ FL
Transient Response Time
Short Circuit Protection
Turn On Delay with Soft Start
Output Overvoltage Protection
GENERAL SPECIFICATIONS
PARAMETER
Efficiency (at full power)
Isolation Voltage (1 min.), Input to Output
Isolation Resistance
Isolation Capacitance
Switching Frequency (FC)
c
External Sync Frequency (Fe)
CONDITION / NOTE
See model selection guide
See model selection guide
See Figure 15
For further reduction see Figure 1 & Figure 4
Minimum VIN to maximum VIN
NL to FL
50% FL to FL to 50% FL, See Figure 11 & 13
By input current limiting
See Figure 12 & 14
None
(See App. Note
CONDITION / NOTE
See model selection guide
All models
See figure 9
MIN TYP MAX UNIT
Vdc
1%
A
±5 ±10
%
40 mV
±.1 %
±.1 %
.01 .02 %/°C
100 µS
MIN TYP MAX UNIT
%
1500
Vdc
109 W
300 pF
200 kHz
210 kHz
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Q25 DC/DC CONVERTER • Q25_DS_RevA.PDF • PAGE 2 OF 9
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ENVIRONMENTAL SPECIFICATIONS
PARAMETER
Operating Temperature Range (Ambient)
Storage Temperature Range
Maximum Operating Case Temperature1
MTBF
Shielding Connection
Shielding Connection
CONDITION / NOTE
Industrial, See Note 2
per MIL-HNBK-217F (Ground benign, +25°C)
- Vin for 24 Vin
+ Vin for 48 Vin
MIN TYP MAX
-40 +71
-55 +125
110
1.1×106
UNIT
°C
°C
°C
hours
Model Selection Guide
MODEL NUMBER
Q25S3.3/24
Q25S5/24
Q25S12/24
Q25S15/24
Q25S3.3/48
Q25S5/48
Q25S12/48
Q25S15/48
Q25D5/24
Q25D12/24
Q25D15/24
Q25D5/48
Q25D12/48
Q25D15/48
INPUT
Voltage (Vdc)
Current (mA)
Nominal Range No Load Full Load
24 9-36 52 1273
24 9-36 73 1240
24 9-36 92 1250
24 9-36 117 1251
48 18-72 33
627
48 18-72 32
607
48 18-72 44
605
48 18-72 52
600
24 9-36 25 1350
24 9-36 47 1276
24 9-36 50 1226
48 18-72 16
660
48 18-72 97
628
48 18-72 41
620
Voltage
(Vdc)
OUTPUT
Current (mA)
Efficiency
Full Load (%)
3.3 7580
5 5000
12 2080
15 1660
3.3 7580
5 5000
12 2000
15 1660
5 2500
12 1040
15 830
5 2500
12 1040
15 830
82
84
84
84
83
85
86
87
77
82
85
78
84
84
1 When converter enters thermal protection on mode, its duty cycle is reduced momentarily and will resume after its internal temperature
(pwm) drops down a few degrees (ºC).The converter’s output behaves similar to hiccup short circuit mode.
2 Contact factory for -55° to +85°C operating temperature range.
3 The maximum input current at any given input range measured at minimum input voltage is given as 1.6*INOMINAL. Nominal input current is the
typical value measured at the input of the converter under full-load room temperature and nominal input voltage ( 24 and 48VIN).
4 Adequate insulation is to be provided to the converters at the end usage as per applicable requirements.
5 Temperature rise on the case of the converters is to be considered during the end usage as per applicable requirements.
ORDERING GUIDE
Q_2_5__ _ __ /__ _ _
Power
Number of Outputs (S = Single, D = Dual)
Output Voltage
Insert X for -55°C to +85°C (Optional)
Insert R for RoHS (Optional)
Input Voltage
Contact factory for custom input and output voltage combinations
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Q25 DC/DC CONVERTER • Q25_DS_RevA.PDF • PAGE 3 OF 9
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