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参数资料
| 型号： | ULS-15/2-D48N-C |
| 厂商： | Murata Power Solutions Inc |
| 文件页数： | 26/30页 |
| 文件大小： | 0K |
| 描述： | 36-75VIN 15VOUT 30W NEG LOGIC |
| 产品培训模块： | ULS 30W 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： | 15V |
| 电流 - 输出（最大）： | 2A |
| 电源（瓦） - 制造商系列： | 30W |
| 电压 - 隔离： | 2.25kV（2250V） |
| 特点： | 具有远程开/关功能和 UVLO |
| 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： | 散装 |
| 工作温度： | -40°C ~ 85°C |
| 效率： | 89% |
| 电源（瓦特）- 最大： | 30W |
| 其它名称： | 811-2259 |
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ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
Short Circuit Condition
When a converter is in current-limit mode, the output voltage will drop as the
+VOUT
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,
C1
C2
SCOPE
R LOAD
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-
–VOUT
C1 = 1μF
C2 = 10μF
LOAD 2-3 INCHES (51-76mm) FROM MODULE
Figure 3. Measuring Output Ripple/Noise (PARD)
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
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.
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 +10V to +15V with respect to –Input).
Positive-logic devices are disabled when the on/off pin is pulled low (0 to 0.7V
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 4.
Dynamic control of the remote on/off function is best accomplished with a
mechanical relay or an open-collector/open-drain drive circuit (optically isolated
if appropriate). The drive circuit should be able to sink appropriate current (see
Performance Speci?cations) when activated and withstand appropriate voltage
when deactivated. Applying an external voltage to pin 2 when no input power is
applied to the converter can cause permanent damage to the converter.
another shutdown cycle. This on/off cycling is referred to as “hiccup” mode.
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
commonly referred to as power limiting. Current limit inception is de?ned
+VIN
ON/OFF
CONTROL
+Vcc
13V CIRCUIT
5V CIRCUIT
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
drawn from the converter, is signi?cant enough, the unit will go into a short
circuit condition as described below.
–VIN
Figure 4. Driving the Negative Logic On/Off Control Pin (simpli?ed circuit)
–VIN
+VOUT
–VIN
+VOUT
ON/OFF
CONTROL
TRIM
R TRIM UP
LOAD
ON/OFF
CONTROL
TRIM
R TRIM DOWN
LOAD
+VIN
–VOUT
Figure 5. Trim Connections To Increase Output Voltages.
If units have sense pins, Connect trim to + Sense pin.
+VIN
–VOUT
Figure 6. Trim Connections To Decrease Output Voltages.
If units have sense pins, connect Trim to (-) Sense pins.
www.murata-ps.com/support
MDC_ULS-30W_C06 Page 26 of 30
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