NPH15S2415IC【PDF 4/8 页】CONV DC/DC 15W24VIN 15.1VOUT DIP

您好，
买卖IC网欢迎您。
请登录
免费注册

1页 2页 3页 [4页]5页 6页 7页 8页

NPH15S Series

Isolated 15W Single Output DC/DC Converters

APPLICATION NOTES (continued)

SYNCHRONIZATION

The converter frequency may be synchronised to an external frequency by connecting a negative going pulse to the SS pin. The drive signal is typically

8V to 12V amplitude and 100ns to 200ns duration. A suitable circuit consists of a CMOS timer (TLC555) connected as an oscillator or as a pulse shaper.

Its logic output (not the discharge output) should be connected via a 4.7nF capacitor to the converter pin. The synchronised frequency is above the free

running value. However, the free running frequency can be lowered, so that sychronisation may include frequencies near or below the natural value. An

example of a practical circuit is shown below, which uses a zener diode to lower the natural frequency. Several converters of this family may be syn-

chronised from the same reference provided the waveform can be maintained by the use of an adequate driver circuit. If the rise time is more than 20ns,

for example, synchronisation may not be achieved over the speci?ed frequency range.

For best ef?ciency, set the frequency within the speci?ed range of its natural state.

TECHNICAL NOTES

ISOLATION VOLTAGE

‘Hi Pot Test’, ‘Flash Tested’, ‘Withstand Voltage’, ‘Proof Voltage’, ‘Dielectric Withstand Voltage’ & ‘Isolation Test Voltage’ are all terms that relate to the same thing, a test voltage,

applied for a speci?ed time, across a component designed to provide electrical isolation, to verify the integrity of that isolation.

Murata Power Solutions NPH15S series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 1500 VDC for 1 second.

A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?”

The NPH15S series has been recognized by Underwriters Laboratory, both input and output should normally be maintained within SELV limits i.e. less than 42.4V peak, or 60VDC.

The isolation test voltage represents a measure of immunity to transient voltages and the part should never be used as an element of a safety isolation system. The part could be

expected to function correctly with several hundred volts offset applied continuously across the isolation barrier; but then the circuitry on both sides of the barrier must be regarded

as operating at an unsafe voltage and further isolation/insulation systems must form a barrier between these circuits and any user-accessible circuitry according to safety standard

requirements.

REPEATED HIGH-VOLTAGE ISOLATION TESTING

It is well known that repeated high-voltage isolation testing of a barrier component can actually degrade isolation capability, to a lesser or greater degree depending on materi-

als, construction and environment. While manufactured parts can withstand several times the stated test voltage, the isolation capability does depend on the wire insulation. Any

material, including this enamel (typically polyurethane) is susceptible to eventual chemical degradation when subject to very high applied voltages thus implying that the number of

tests should be strictly limited. We therefore strongly advise against repeated high voltage isolation testing, but if it is absolutely required, that the voltage be reduced by 20% from

speci?ed test voltage.

www.murata-ps.com/support

KDC_NPH15S.F05 Page 4 of 8

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

NPH25S2415IC CONV DC/DC 25W24VIN 15.1VOUT DIP

NPVV567M002R0003 CAP NIOB OXIDE 560UF 2.5V 2924

NPX20S48033DC CONV DC/DC 6A 48VIN 3.3VOUT SGL

NR10050T680M INDUCTOR WOUND 68UH 1.7A SMD

NR6012T101M INDUCTOR 100UH 350MA 20% SMD

NRS5012T3R3MMGF INDUCTOR POWER 3.3UH 1.45A SMD

NS10155T4R7NNA INDUCTOR POWER 4.7UH 30% SMD

NTA1212MC CONV DC/DC 1W 12VIN 12V DL 1KV

相关代理商/技术参数

NPH15S2415XXX 制造商:CANDD 制造商全称:C&D Technologies 功能描述:Isolated 15W Single Output DC/DC Converters

NPH15S4803EI 功能描述:DC/DC转换器 15W 48V to 3V 5A 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:

NPH15S4803EIC 功能描述:DC/DC转换器 15W 48V to 3V 5A Single Output 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:

NPH15S4803I 功能描述:DC/DC转换器 15W SINGLE OUT 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:

NPH15S4803IC 功能描述:DC/DC转换器 48Vin 3.4Vout 4.4A Isolated 15W 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:

NPH15S4803XXX 制造商:CANDD 制造商全称:C&D Technologies 功能描述:Isolated 15W Single Output DC/DC Converters

NPH15S4805EI 功能描述:DC/DC转换器 15W 48V TO 5.1V ADJ 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:

NPH15S4805EIC 功能描述:DC/DC转换器 15W 48V TO 5.1V ADJ Single Output 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: