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| 型号： | ULS-5/12-D48P-C |
| 厂商： | Murata Power Solutions Inc |
| 文件页数： | 21/24页 |
| 文件大小： | 0K |
| 描述： | CONVERTER DC/DC 5V @ 12A POS |
| 产品目录绘图： | ULS Series |
| 标准包装： | 128 |
| 系列： | ULS |
| 类型： | 隔离 |
| 输出数： | 1 |
| 电压 - 输入（最小）： | 36V |
| 电压 - 输入（最大）： | 75V |
| Voltage - Output 1： | 5V |
| 电流 - 输出（最大）： | 12A |
| 电源（瓦） - 制造商系列： | 60W |
| 电压 - 隔离： | 2.25kV（2250V） |
| 特点： | 具有远程开/关功能 |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP 模块，1/16 砖 |
| 尺寸/尺寸： | 1.30" L x 0.90" W x 0.40" H（33.0mm x 22.9mm x 10.2mm） |
| 包装： | 托盘 |
| 工作温度： | -40°C ~ 85°C |
| 效率： | 90% |
| 电源（瓦特）- 最大： | 60W |
| 产品目录页面： | 2720 (CN2011-ZH PDF) |
| 其它名称： | 811-2202 |
ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
Floating Outputs
Since these are isolated DC/DC converters, their outputs are “?oating” with
respect to their input. Designers will normally use the –Output as the ground/
return of the load circuit. You can however, use the +Output as ground/return to
effectively reverse the output polarity.
Minimum Output Loading Requirements
ULS converters employ a synchronous-recti?er design topology and all models
regulate within spec and are stable under no-load to full load conditions.
Operation under no-load conditions however might slightly increase the output
ripple and noise.
Thermal Shutdown
The ULS converters are equipped with thermal-shutdown circuitry. If environ-
mental conditions cause the temperature of the DC/DC converter to rise above
the designed operating temperature, a precision temperature sensor will power
down the unit. When the internal temperature decreases below the threshold
of the temperature sensor, the unit will self start. See Performance/Functional
Speci?cations.
Output Over-Voltage Protection
The ULS output voltage is monitored for an over-voltage condition using a com-
parator. The signal is optically coupled to the primary side and if the output volt-
age rises to a level which could be damaging to the load, the sensing circuitry
will power down the PWM controller causing the output voltage to decrease.
Following a time-out period the PWM will restart, causing the output voltage
to ramp to its appropriate value. If the fault condition persists, and the output
voltage again climbs to excessive levels, the over-voltage circuitry will initiate
another shutdown cycle. This on/off cycling is referred to as “hiccup” mode.
Remote Sense
Note: The Sense and V OUT lines are internally connected through low-value
resistors. Nevertheless, if the sense function is not used for remote regulation
the user should connect the +Sense to +V OUT and –Sense to –V OUT at the DC/
DC converter pins. ULS series converters employ a sense feature to provide
point of use regulation, thereby overcoming moderate IR drops in PCB conduc-
tors or cabling. The remote sense lines carry very little current and therefore
require minimal cross-sectional-area conductors. The sense lines, which are
capacitively coupled to their respective output lines, are used by the feedback
control-loop to regulate the output. As such, they are not low impedance points
and must be treated with care in layouts and cabling. Sense lines on a PCB
should be run adjacent to dc signals, preferably ground.
[V OUT (+)-V OUT (–)] – [Sense(+)-Sense(–)] ? 10%V OUT
In cables and discrete wiring applications, twisted pair or other techniques
should be used. Output over-voltage protection is monitored at the output volt-
age pin, not the Sense pin. Therefore, excessive voltage differences between
V OUT and Sense in conjunction with trim adjustment of the output voltage can
cause the over-voltage protection circuitry to activate (see Performance Speci-
?cations for over-voltage limits). Power derating is based on maximum output
current and voltage at the converter’s output pins. Use of trim and sense func-
tions can cause output voltages to increase, thereby increasing output power
beyond the converter’s speci?ed rating, or cause output voltages to climb into
the output over-voltage region. Therefore, the designer must ensure:
(V OUT at pins) x (I OUT ) ? rated output power
Contact and PCB resistance
losses due to IR drops
Current Limiting
As soon as the output current increases to approximately 130% of its rated
value, the DC/DC converter will go into a current-limiting mode. In this condi-
tion, the output voltage will decrease proportionately with increases in output
current, thereby maintaining somewhat constant power dissipation. This is
+VIN
ON/OFF
CONTROL
+VOUT
+SENSE
TRIM
I OUT
Sense Current
LOAD
commonly referred to as power limiting. Current limit inception is de?ned
as the point at which the full-power output voltage falls below the speci?ed
tolerance. See Performance/Functional Speci?cations. If the load current, being
–SENSE
Sense Return
I OUT Return
drawn from the converter, is signi?cant enough, the unit will go into a short
circuit condition as described below.
–VIN
–VOUT
Short Circuit Condition
When a converter is in current-limit mode, the output voltage will drop as the
output current demand increases. If the output voltage drops too low, the mag-
netically coupled voltage used to develop primary side voltages will also drop,
thereby shutting down the PWM controller. Following a time-out period, the
PWM will restart causing the output voltage to begin ramping to their appropri-
ate value. If the short-circuit condition persists, another shutdown cycle will be
initiated. This on/off cycling is referred to as “hiccup” mode. The hiccup cycling
reduces the average output current, thereby preventing internal temperatures
from rising to excessive levels. The ULS Series is capable of enduring an inde?-
nite short circuit output condition.
Contact and PCB resistance
losses due to IR drops
Figure 4. Remote Sense Circuit Con?guration
On/Off Control
The input-side, remote On/Off Control function can be ordered to operate with
either logic type:
Positive ("P" suf?x) logic models are enabled when the on/off pin is left
open (or is pulled high, applying +3.5V to +15V with respect to –Input) as per
Figure 5. Positive-logic devices are disabled when the on/off pin is pulled low
(0 to 1V with respect to –Input).
Negative (“N” suf?x) logic devices are off when pin is left open (or pulled
high, applying +2.5V to +15V), and on when pin is pulled low (–0.1 to +0.8V)
with respect to –Input as shown in Figure 5.
www.murata-ps.com/support
MDC_ULS Series.B31 Page 21 of 24
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| ULSE-ALLEGRO-ORCAD | 制造商:ACCELERATED DESIGNS 功能描述:ULTRA LIBRARIAN TOOL FOR CADENCE 制造商:ACCELERATED DESIGNS 功能描述:ULTRA LIBRARIAN TOOL, FOR CADENCE 制造商:ACCELERATED DESIGNS 功能描述:ULTRA LIBRARIAN TOOL, PCB DESIGN, CADENCE ALLEGRO; Software Application:PCB Design, Component Libraries; Software Edition:SE; No. of User Licenses:1; Supported Hosts:Windows 95, 98, ME, 2000, XP, Vista, 7 ;RoHS Compliant: NA |
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