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參數(shù)資料
| 型號(hào)： | UVQ-18/5.6-D24NB |
| 元件分類(lèi)： | 電源模塊 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT |
| 文件頁(yè)數(shù)： | 5/9頁(yè) |
| 文件大?。?/td> | 612K |
| 代理商： | UVQ-18/5.6-D24NB |
Removal of Soldered UVQ's from Printed Circuit Boards
Should removal of the UVQ from its soldered connection be needed, thor-
oughly de-solder the pins using solder wicks or de-soldering tools. At no time
should any prying or leverage be used to remove boards that have not been
properly de-soldered rst.
Input Source Impedance
UVQ converters must be driven from a low ac-impedance input source.
The DC/DC’s performance and stability can be compromised by the use of
highly inductive source impedances. The input circuit shown in Figure 2 is a
practical solution that can be used to minimize the effects of inductance in
the input traces. For optimum performance, components should be mounted
close to the DC/DC converter.
I/O Filtering, Input Ripple Current, and Output Noise
All models in the UVQ Series are tested/specied for input ripple current
(also called input reected ripple current) and output noise using the circuits
and layout shown in Figures 2 and 3.
Figure 2. Measuring Input Ripple Current
CIN
VIN
CBUS
LBUS
CIN = 33F, ESR < 700m
@ 100kHz
CBUS = 220F, ESR < 100m
@ 100kHz
LBUS = 12H
3
1
+INPUT
–INPUT
CURRENT
PROBE
TO
OSCILLOSCOPE
+
–
T E C H N I C A L N O T E S
External input capacitors (CIN in Figure 2) serve primarily as energy-stor-
age elements. They should be selected for bulk capacitance (at appropriate
frequencies), low ESR, and high rms-ripple-current ratings. The switching
nature of DC/DC converters requires that dc voltage sources have low ac
impedance as highly inductive source impedance can affect system stability.
In Figure 2, CBUS and LBUS simulate a typical dc voltage bus.Your specic
system conguration may necessitate additional considerations.
5
2 . 5 - 4 0 A M P I S O L A T E D D C / D C C O N V E R T E R S
UVQ Series
Environmental
Calculated MTBF (4)
TBD Hours
Operating Temperature Range (Ambient)
No baseplate
No derating, 200 LFM airow
–40 to +70°C (9)
(all models except 18V-D24)
No derating, 200 LFM airow
–40 to +45°C (18V-D24 models)
With derating
See Derating Curves
Operating Temperature with Baseplate
–40 to +110°C maximum
(No derating required) (3) (13)
Storage Temperature Range
–55 to +125°C
Thermal Protection/Shutdown
+110°C
Density Altitude
0 to 10,000 feet
Relative Humidity
10% to 90%, non-condensing
Physical
Outline Dimensions
See Mechanical Specications
Baseplate Material
Aluminum
Pin Material
Solder-coated brass
Weight
TBD ounces (TBD grams)
Electromagnetic Interference
FCC part 15, class B, EN55022
(conducted and radiated)
(may need external lter)
Safety
UL/cUL 60950 CSA-C22.2 No.234
IEC/EN 60950
(1)
All models are tested and specied with 200 LFM airow, external 1||10F ceramic/tantalum
output capacitors and a 33F external input capacitor. All capacitors are low ESR types. These
capacitors are necessary to accommodate our test equipment and may not be required to
achieve specied performance in your applications. All models are stable and regulate within
spec under no-load conditions.
General conditions for Specications are +25°C, VIN =nominal, VOUT = nominal, full load.
(2)
Input Ripple Current is tested and specied over a 5-20MHz bandwidth. Input ltering is
CIN = 33F tantalum, CBUS = 220F electrolytic, LBUS = 12H.
(3)
Note that Maximum Power Derating curves indicate an average current at nominal input
voltage. At higher temperatures and/or lower airow, the DC/DC converter will tolerate brief full
current outputs if the total RMS current over time does not exceed the Derating curve.
(4)
Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case
3, ground xed conditions, Tpcboard = +25°C, full output load, natural air convection.
(5)
The On/Off Control may be driven with external logic or by applying appropriate external
voltages which are referenced to Input Common. The On/Off Control Input should use either an
open collector/open drain transistor or logic gate which does not exceed +13.5V.
(6)
Short circuit shutdown begins when the output voltage degrades approximately 2% from the
selected setting.
(7)
The outputs are not intended to sink appreciable reverse current. Sinking excessive reverse
current may damage the outputs.
(8) Output noise may be further reduced by adding an external lter. See I/O Filtering and Noise
Reduction.
(9)
All models are fully operational and meet published specications, including “cold start” at –40°C.
(10)
Regulation specications describe the deviation as the line input voltage or output load current
is varied from a nominal midpoint value to either extreme.
(11)
Overvoltage shutdown on 48V input models is not supplied in order to comply with telecom
reliability requirements. These requirements attempt continued operation despite signicant
input overvoltage.
(12)
Do not exceed maximum power specications when adjusting the output trim.
(13)
Note that the converter may operate up to +110°C with the baseplate installed. However,
thermal self-protection occurs near +110°C. Therefore, +100°C is recommended to avoid
thermal shutdown.
Absolute Maximum Ratings
Input Voltage
24V models
48V models
Continuous
0 to +36V
0 to +75V
Transient (100 mS)
+50V
+100V
On/Off Control
–0.3 V min to +13.5V max.
Input Reverse Polarity Protection
See Fuse section
Output Overvoltage
VOUT +20% max.
Output Current (Note 7)
Current-limited. Devices can
withstand sustained short circuit
without damage.
Storage Temperature
–55 to +125°C
Lead Temperature (soldering 10 sec.) +300°C
Absolute maximums are stress ratings. Exposure of devices to any of these conditions may
adversely affect long-term reliability. Proper operation under conditions other than those listed
in the Performance/Functional Specications Table is not implied nor recommended.
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