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Q25S5-48 Schematic ( PDF Datasheet ) - Beta Dyne

Teilenummer Q25S5-48
Beschreibung 25-30W DC/DC Converter
Hersteller Beta Dyne
Logo Beta Dyne Logo 




Gesamt 9 Seiten
Q25S5-48 Datasheet, Funktion
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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
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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
http://www.Datasheet4U.com/






Q25S5-48 Datasheet, Funktion
FIGURE 7:
FIGURE 7: Output ripple of Q25D15/24 on -Vout as
shown in Figure 4.
FIGURE 8:
FIGURE 8: Output ripple of Q25D15/24 on -Vout with another external
cap of Nippon Chemi-Con 180µF@16V on
the -Vout. The part number is 16PS180MH11.
Ex S
z
Multiple Q25 converters can be synchronized together simply
The SYNC pin can be used to synchronize the internal os- by connecting the converters SYNC pins together as shown in figure
cilllator to external clock. An open drain output is the recommended 8. Care should be taken to ensure the ground potential differences
interface between the external clock to the Q25 SYNC pin as shown between the converters are minimized. In this configuration all the
in figure 7. The clock pulse width must be greater than 15ns. The converters will be synchronized to the highest frequeny device. The
external clock frequency must be greater than the frequency of the SYNC pin is a CMOS buffer with pull-up current limited to 200micro
Q25.
amps. If the external device forces the SYNC pin low before the
internal oscillator ramp completes its charging cycle, the ramp will
reset and another cycle begins. If the SYNC pins of multiple Q25
converters are connected together, the first SYNC pin that pulls low
will reset the oscillator ramp of all the other converters. All converters
will operate in phase when synchronized using the SYNC feature.
Up to five devices can be synchronized using this method.
FIGURE 9. SYNC from external clock
2N7002
Q25
2 SYNC
3 GND
Q25
2 SYNC
3 GND
FIGURE 10. SYNC of multiple devices
BETA DYNE INC • WWW.BETA-DYNE.COM
Q25 DC/DC CONVERTER • Q25_DS_RevA.PDF • PAGE 6 OF 9
http://www.Datasheet4U.com/

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