ULS-12/2.5-D48N-C【PDF 26/30 页】36-75VIN 12VOUT 30W NEG LOGIC

您好，
买卖IC网欢迎您。
请登录
免费注册

22页 23页 24页 25页 [26页]27页 28页 29页 30页

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

发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

*型号	*数量	厂商	批号	封装

添加更多采购

我的联系方式

*

*

*

相关PDF资料

ULS-12/5-D48P-C CONVERTER DC/DC 12V @ 5A POS

ULT-5/5-D48P-C DC/DC CONVERTER 5V 5A 25W BRICK

UM2NPAT BATTERY S-HD 1.5V C SIZE W/TAB

UMA1V470MDD CAP ALUM 47UF 35V 20% RADIAL

UMK107SD102JA-T CAP CER 1000PF 5% 50V 0603

UNL6W30K-F CAP FILM 30UF 600VDC SNAP

UNR-3.3/3-D5SM-C DC/DC SM 3A 5-3.3V NON-ISO

UP-VW1220P1 BATTERY VRLA 12V 20W

相关代理商/技术参数

ULS-12/2.5-D48NM-C 功能描述:DC/DC转换器 30W 48V 12Vout 2.5A Neg Polarity SMT RoHS:否制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸:

ULS-12/2.5-D48P-C 功能描述:DC/DC转换器 30W 48V 12Vout 2.5A Pos Polarity TH RoHS:否制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸:

ULS-12/2.5-D48PM-C 功能描述:DC/DC转换器 30W 48V 12Vout 2.5A Pos Polarity SMT RoHS:否制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸:

ULS-12/5-D48N-C 功能描述:DC/DC转换器 60W 48Vin 12Vout 5A NEG LOGIC RoHS:否制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸:

ULS-12/5-D48NH-C 功能描述:DC/DC转换器 60W 48Vin 12Vout 5A NEG LOGIC CONFML CTG RoHS:否制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸:

ULS-12/5-D48P-C 功能描述:DC/DC转换器 60W 48Vin 12Vout 5A POS LOGIC RoHS:否制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸:

ULS-12/5-D48PH-C 功能描述:DC/DC转换器 60W 48Vin 12Vout 5A POS LOGIC CONFML CTG RoHS:否制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸:

ULS-12/8.3-D48N-C 功能描述:DC/DC转换器 99.6W 48Vin 12Vout 8.3A Neg Log RoHS:否制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: