| 座谈题目：日立开关电源用功率MOS场效应晶体管和控制集成电路 |
| 精彩回放 |
| 2002年3月21日，中国电子元器件信息交易网（简称中电网，www.ChinaECNet.com）与著名的日立公司合作，成功地举办了该公司在中电网上的在线座谈。 |
| [问：yanying9980]我想问一下,日立开关电源具体在什么电器上使用.还有他的具体作用是什么,如此的专业术语,我不太能弄清楚,希望您能给我简洁明朗一些的解释,这样才能让大多数人能够了解其产品的使用用途.谢谢! |
| [答：]Now they are using SMPS for home applications as follow; Example are 1).TV, 2).Lighting inverter
3).PDP etc. |
| [问：tiffy]对开关电源功率MOS场效应晶体管的开发和应用，日立有否新的计划和设想？ |
| [答：] We have development next generation D8-L process of 48VDC/DC converter
for Telecom and Server. 30V D8-L SPL will be the end of MAY. |
| [问：tiffy] 因为质量的原因，日立开关电源功率MOS场效应晶体管和控制集成电路价格是否会较同类产品有较大提升？ |
| [答：]Hitachi product quality is good, but it is not an essential factor
for price. That is, Hitachi product is still in market price |
| [问：tiffy]日立开关电源功率MOS场效应晶体管相比其它产品在节能方面有多大优势？ |
| [答:] We think the advantage is RDS(on)*Qg performance is better than that
of the competitor ( particularly in Hitachi Low voltage D7-L series) |
| [问：tiffy] 中国目前有否使用日立开关电源功率MOS场效应晶体管和控制集成电路的公司和产品？具体是哪些？ |
| [答：]Yes |
| [问：JOE-DING]请回复有关HITACHI是否有DC/DC IC VIN =1。8V~3。0 VOUT=3。0或3。3V
SMD PAKAGE 5个引脚 |
| [答:]Sorry Hitachi does not focus on low voltage dc to dc IC. |
| [问：JOE-DING]请问HITACHI有关HA17431相关资料 |
| [答：] Yes Hitachi has it. You can find it in Hitachi web site. (http//semiconductor.hitachi.com.hk) |
| [问：风之子]用贵公司的芯片作设计，如何提高开关电源的效率？ |
| [答：] Generally power efficiency depends on power circuit topology. |
| [问：风之子] 请问日立有无成品DC-DC,AC-DC模块，如何取得其资料，我们现用VICOR的，太贵 |
| [答：] Sorry Hitachi semiconductor division does not have power supply module. |
| [问：toneyli]贵公司有技术支持吗？如何联系？ |
| [答：] Yes, we have. Please inform us your company name and contact person.
We will let you know and inform where and who you should contact |
| [问：toneyli] 在哪里下载本次在线座谈的各种播放资料？ |
| [答：] (will inform you later about which web page) |
| [问：jmwxqfree1]请问是否UPS专用管? |
| [答：] Please inform us your detailed Spec . |
| [问：lqz] 用MOS管作开关管时如何降低噪声 |
| [答：]At first, The most important item is to reduce the parasitic inductance
in circuit especially for high current operating load. And, if the switching
speed is delayed (ajustable
by external gate series resistance), it can reduce the noise (but it is
increase switching loss). |
| [问：uuxuwen]能否提供日立DC-DC，降压9-12V to 3.5V(0-2.5A)开关电源方案(指PWM
IC，MOS场效应晶体管),我们用于Battery charger,希望效率大于85%. |
| [答：] HA16114/HA16116 may be available to use. Regarding MOSFET, Hitachi
recommends HAT2071R or HAT2070R |
| [问：hfapi] 我对日立公司的K560系列场效应有很好的感觉,原因是它比同容量其它公司的产品似乎可靠性要高,但丛参数上并不能发现它有明显的不同,在实际中,它总是给人以栅-源间有很大的漏电感觉,请问这个系列的管子在结构中有何特点,它会带来哪些好处,驱动电路,阻尼电路的设计有无需要特别注意的地方. |
| [答：] Sorry 2SK560(D2-H) is discontinue about ten years ago.We recommend
new generation 2SK3235(D5-H) instead of 2SK560. |
| [问：hfapi] 我想索取有关的资料手册 |
| [答：] related information have product catalog, presentation and data books
etc. Pls specify which. |
| [问：zhfdc] 请问你们的产品功率有多大呀？ |
| [答：] For example, in case of 500V series is 60A(p/n H5N5005PL) |
| [问：pylxg] 日立MOS场效应对管的未来的发展和应用？ |
| [答：]Please refer the presentation material of today's seminar. |
| [问：pylxg] MOS场效应管有那几类？ |
| [答：] Hitachi has many kinds of MOSFET(From 20V to 1500V). |
| [问：pylxg]日立开关电源功率MOS场效应晶体管的工作原理是什么？ |
| [答：]MOSFET is Gate Voltage drive device. On the other hand ,Bipolar Transistor
is driven by Base current. |
| [问：pylxg]lfpak和sop－8如何进行 区别？ |
| [答：] LFPAK is suitable for high current and high frequency use compared
with SOP-8. |
| [问：pylxg] 日立MOS场效应对管的未来的发展和应用？ |
| [答：] Please refer the presentation material of today's seminar. |
| [问：波尔电源] 您的产品在中国哪些公司成功大规模应用过？ |
| [答：] yes |
| [问：81929]如果能方便的连系到贵单位？如果能得到详细资料？ |
| [答：] Please tell us what information you need. For convenience, pls contact
http://semiconductor.hitachi.com.hk |
| [问：81929] 请问该产品的价格是多少？ |
| [答：]Which product you ask? |
| [问：xqluo] I don't know your IC and MOSFET used in power
supply before coming here. Could you have a summary on your history and
roadmap in controller IC of power supply? |
| [答：]Could you inform us your product plan. Hitachi will inform you that
meeting your plan. |
| [问：zhangmin] In our lab. the MOS product
should be used under zero centigrade , does it have some influence to the
performance of MOS . Thanks ! |
| [答：] Generally, Drain-source Break down voltage goes down as temperature
goes down. |
| [问：yangruifeng] 请问该产品在那里可以买到？ |
| [答：]Please ask Hitachi branch office where
is near you. If you don't know where, pls let us know. |
| [问：yangruifeng]日立开关电源功率MOS场效应晶体管和控制集成电路的性能稳定吗？ |
| [答：] Within guaranteed spec, all characteristic are stable. |
| [问：freespirit001] 我实验领域的应用环境的干扰特别大，请问MOS场效应晶体管的抗干扰性能如何？是否适合强干扰环境 |
| [答：] Generally Hitachi is not using the no good material for the environment. |
| [问：freespirit001] In our lab. there are very big interference
for the environment ,so i want to know the anti-interference properties
of your product ? Thanks a lots! |
| [答：] Generally Hitachi is not using the no good material for the environment. |
| [问：王永昆]请介绍一下在那里能找到贵公司的关于pwm的资料？ |
| [答：] Pls tell us what PWM you need. PWM IC product information? |
| [问：王永昆] 请问贵公司对开关电源的发展方向有什么最新的看法？ |
| [答：] Hitachi semiconductor division does not have power supply module.
Regarding control IC, please refer the material of the seminar. |
| [问：王永昆] 如何获取贵公司的关于开关电源的资料？ |
| [答：] We have components such as mosfet, IC etc) for SMPS. No SMPS products.
Which thing you need. |
| [问：王永昆] 去那里能找到关于控制集成电路的资料？ |
| [答：]Please contact http://semiconductor.hitachi.com.hk |
| [问：王永昆] 请谈一谈开关电源在民用领域里的发展前景？ |
| [答：] Hitachi semiconductor division does not have power supply module.
Regarding control IC, please refer the material of the seminar. |
| [问：ljmwxqfree1]这些产品适合UPS吗？请具体谈谈？ |
| [答：] HA16107, HA17384 may be suitable to UPS. |
| [问：zhangmin]what is the best working temperature fit
for the amplifier?thanks |
| [答：] Best working is within guaranteed temperature. |
| [问：ljmwxqfree1] 怎样获取贵公司产品用于小型马达驱动的资料？ |
| [答：] Please refer hppt://semiconductor.hitachi.com.hk |
| [问：lqz] 用场管作同步整流时，空载损耗较大如何产生的如何解决？ |
| [答：] Since Gate drive power dissipations is content, Efficiency goes down
as output power decreases. |
| [问：zjsab] 是否有控制IC与功率MOSFET集成一体的产品 |
| [答：] Sorry Hitachi dose not have combined IC of power MOS with control
circuit at present time. |
| [问：henry] What is the advantage of N-MOS compare to P-MOS
process used in Power MOSFET |
| [答：] The advantage of N-channel MOS is RDS(on) better than P-channel MOS
about half lower with same die size. |
| [问：starforce] 同样的功率，日立开关MOS场效应晶体管产生的热量比常用的MOS场效应晶体管和双极晶体管产生的热量相比低多少? |
| [答：] Power loss is determined by On loss(RDS(on)) & SW
loss(Qgd) & Drive loss(Qg). All items of Hiatchi's MOSFET are reduced
compared with others. |
| [问：starforce]当输出功率超过最大值并且其持续时间比允许的更长时，为避免MOS场效应晶体管过热,日立采取何种手段来进行过载保护?其智能化程度达到何种水平? |
| [答：] It is no problem in case of channel temperature keeps under 150degC. |
| [问：starforce] 开关MOS场效应晶体管是否要求特殊的设计和特别注意防静电措施? |
| [答：] Generally, No special design is required for SW MOSFET. In case of
special high frequency Operation(over 1MHz) Gate drive voltage should be
reduced for decreasing driving power loss(Pdrive= f * Vgs * Qg).Generally,
no problem for electro-static issue. |
| [问：] 我们一般知道，开关电源的频率越高，它的体积会越小，PFM+PWM如何使体积更小？ |
| [答：] The solution of smaller size of "PFC+PWM" power supply
is same as general switching power supply.
If switching frequency is higher, you can reduce the outline
size. |
| [问：] 据播放的资料，PFC+PWM结合可使噪音降低。使用PFC，如何能降低EMI？请具体说明工作原理。 |
| [答：] HA16141/HA16142 of “PFC+PWM” combined IC is synchronized switching
frequency by itself between PFC and PWM. Therefore the power supply does
not has beet noise. |
| [问：] PFC+PWM 如何共同控制？如何调整它们之间的脉冲频率？ |
| [答：] PFC is a boost dc to dc power supply converter.
The PFC function is controlled output dc voltage with input ac current. The result, the PFC output
voltage becomes constant voltage. And, PFC input current becomes sign wave
that wave is following to ac input voltage. |
| [问：]“光成型器”在冗余备份电源中的作用是否是隔离作用？ |
| [答：] Yes. The purpose of some photo coupler is for isolation. |
| [问：]播放资料中说，48V输入的DC/DC电源采用变压器耦合，没有内部压降，为什么说低Vout时效率低？ |
| [答：] If output voltage is low. Loss power becomes increase. |
| [问：] 静区调节和静区脉冲主要作用是什么？ |
| [答：] (pls state clearly about your request. We did not really understand
it) |
| [问：] 请详细说明SW模式的工作原理。它能改进性能的主要原因是什么？ |
| [答：] The reason of PWM is stable for the output voltage.
The improvement is case by case. |
| [问：]C模式中快速反馈和慢速反馈如何调节？采用两种不同的反馈速率是否要取得良好的相位补偿？或者是别的什么？ |
| [答：] C-mode should be necessary high speed with low speed feed back.
The C-mode is easy phase compensation than V-mode. |
| [问：] C模式中的频率可变是通过什么来实现？如何确定它的频率？是自动调整的吗？ |
|
[答：] Normal C-mode frequency is fixed.
|
| [问：] 手提电脑中的同步整流如何实现？有样品吗？ |
| [答：] Sorry Hitachi does not synchronized dc to dc switching power supply
IC for have note PC yet. |
| [问：] 什么是FRD的含义？ |
| [答：]FRD = Fast Recovery Diode; some
mosfets are built-in FRD for high switching speed |
| [问：] PFC是如何控制MOSFET的？它又受那部分控制？ |
| [答：] (We don't understand the question. Pls state clearly for us) |
| [问：]什么是过零SW？ |
| [答：] When Drain-Source Voltage of power MOS reached zero voltage, Power
MOS is doing on or off. It is called zero voltage switching. |
| [问：] 有没有非隔离结构的DC/DC转换器？ |
| [答：]Hitachi have some non isolated dc to dc switching regulator ICs.
There are HA16120, HA16114, HA16116, HA16121, HA17451 and other. |
| [问：] 并联调节器的作用是什么？有没有过压保护功能？ |
| [答：]The shunt regulator is using for error amplifier of switching control
circuit. |
| [问：] LEPEK的成本比一般的封装要高多少？ |
| [答：] LFPAK reduced PKG Resistance and Indactance, also down Thermal Resistance,
So you can get high efficiency in high frequency operation. |
| [问：]复合结构如何能减小浪涌电压？是因为集成度高了或引线短了或其它原因？ |
| [答：] Because Inductance of wiring connection can be redued compare with
each discreat compornent use. |
| [问：] 您好，我的机器上原有一片HM62256BLP-8，但我换上一片新的以后（确定是好的），输入原先的全部程序程序，却不能象以前那样向下执行。这是为什么？是不是原带有的HM62256BLP-8进行了什么设置？ |
| [答：] (Sorry no answer. Not our scope) |
| [问：] 请谈一下日立开关电源用功率MOS场效应晶体管和控制集成电路的特有优势.' 请问模拟器件和ATMEL的器件有关替代产品？ |
| [答：] Regarding MOSFET(Low Voltage), Hitachi's MOSFET is not only supper
Low RDS(on). Also suitable design for Low Qg and Low Qgd. So, you should
can be solved too high efficiency in high frequency operation.
Since, Hitachi's Ics incloud many functions, components for Power
Supply can be reduced. |
| [问：]对于输入220V/50Hz,输出12V/0.8-1A的应用，能否提供一个外围器件最少，电磁辐射最低的解决方案？ |
| [答：] Low EMC/EMI solution depends on : Layout of PCB, used
soft switching, used resonant switching and other. |
| [问：]日立有没有步进电机的功率放大电路（步进电机的电流)请介绍一下日立的MOS场效应晶体管和控制集成电路与其它厂商同类产品的优势。 |
| [答：] Sorry that we have no such circuit.
Regarding MOSFET(Low Voltage), Hitachi's MOSFET is not only supper
Low RDS(on). Also suitable design for Low Qg and Low Qgd. So, you should
can be solved too high efficiency in high frequency operation.
Since, Hitachi's Ics incloud many functions, components for Power
Supply can be reduced. |
| [问：] 日立公司的产品和同类产品有那些优势呀！诸如技术，价格，保质期？ |
| [答：] (Pls state what knid of products) |
| [问：] 我现在正在做一些语音方面的项目，但我设计好电路板后调试，发现语音有点背景音，我的同事说可能是电源引起的，不知道有什么方法可以消除呢 |
| [答：] Sorry that we have no idea about this problem. Now Hitachi focus
on the mosfet and control IC for SMPS, motor and automobile applications. |
| [问：]该产品较普通晶体管有何技术优势？ |
| [答：] (which products?) |
| [问：] 请问：便携式数据采集系统如何运用MOS构建电源子系统？ 谢谢" |
| [答：] " Power Supply sub-system" is not clear. Fundamentally,
MOSFET can be operated in higher frequency than Bipolar Transistor. |
| [问：]在-20度工作时，参数是否会下降？ |
| [答：] If temperature is decrease, Vdss is goes down, and RDS(on) is also
goes down. |
| [问：] 我在3月5日就提了个问题，现在还没得到回答，现在我再提一次：请问日立开关电源用功率MOS场效应晶体管和控制集成电路是否可用在汽车领域？如果有，请指出用在什么地方？谢谢！ |
| [答：] Yes. For example, Hitachi's MOSFETs are using ABS and Airbag, EPS
etc. |
| [问：] HA16163价格？ |
| [答：] (Pls contact us and provide more information about yr usage of this
IC. our web site is: http//semiconductor.hitachi.com.hk) |
| [问：]请问Qg和底Qgd趁势的解决方案应用在什么领域？谢谢！ |
| [答：] Low Qg and Qgd are very useful for high frequency operation especialy
for DC/DC converter. |
| [问：] 功率MOSFET的详细资料如何索取？北京地址或电话？谢谢 |
| [答：] (pls contact us at : http//semiconductor.hitachi.com.hk) |
| [问：] 请问日立开关电源功率MOS场效应晶体管和控制集成电路产品的价格如何？我公司拟大批量采购，不知可否优惠？ |
| [答：](Pls contact us and provide more information of which products you
will use. our contact web site is: http//semiconductor.hitachi.com.hk) |
| [问：] 日立开关电源用功率MOS场效应晶体管和控制集成电路在使用过程中有什么要求? |
| [答：]It is no problem in case of channel temperature keeps under 150degC. |
| [问：] 请问日立开关电源用功率MOS场效应晶体管和控制集成电路是否可用在汽车领域？如果有，请指出用在什么地方？ |
| [答：]Yes, Hitachi mosfets can be used in automobile system, such as anti-lock
brake ststem, electrical power steering system, vehicle stability control
sysem |
| [问：] 在使用开关电源供电地情况下，视频运放在使用中非常容易出现自激现象。如何克服自激现象。 谢谢！ |
[答：](1) In case of SW mode power supply, it will be solved by compensation
of the phase,
Capacitor will be used between
input and output for error amplifier |
| [问：] 贵公司的功率MOS场效应关可用于小型马达驱动，请问有没有专用于PWM输出驱动控制直流永磁微型电动机的集成芯片？怎样获取贵公司产品用于小型马达驱动的资料？ |
[答：]Which application do you use ?
If you need high voltage. We recommend Built-in FRD typ. We have lineup
500V, Id=10A to 50A Example 2SK1522 (500V,50A) 250V, Id=20A to 50A Example
H5N2507P (250V,50A)
If you need low voltage use. We recommend 30A to 60V. Example HAT3010R |
| [问：] 在高频率开关电源中，驱动电路如何克服功率MOSFET的大输入电容的影响？谢谢！ |
[答：]If the large capacitance MOSFET drive,You must need high gate peak
current.
ig ; (peak)=Qg/t (A)
t ;Switching speed
Qg ;Total Gate charge(See each data sheet) |
| [问：] 日立开关电源用功率MOS场效应晶体管和控制集成电路是否必须联合使用，换句话说控制集成电路可否应用于别的厂家的MOS场效应晶体管 |
| [答：]It is not necessary to use Hitachi mosfet and control IC together.
Of course our IC can be used with other company mosfet. |
| [问：] 请问日立的功率MOS场效应晶体管和控制集成电路在医用设备电源的应用效果和范围。能否提供300W至500W的功率。控制电路和保护电路的功能有哪些。 |
| [答：]Yes, applicable to medical equipment. power of 300W to 500W possible |
| [问：] 在3KW~10KW的开关电源(输入3相380V)上,日立推荐什么MOSFET? |
[答：]500V Voltage series.
We recommend currently device that is 2SK1518 (500V/20A,0.22ohm), 2SK1522
(500V/50A,0.085ohm).
Then, New device H5N5004PL (500V/50A,0.09ohm) and H5N5005PL (500V/60A,0.07ohm) |
| [问：] 在应用功率MOS场效应晶体管设计PWM功率放大器时应注意些什么？选择哪一种PWM控制集成电路（q=0-100%）比较合适？ |
[答：](1) HA16107/HA17384/385/ HA16141/HA16114 is PWM IC.
Please use within max current and voltage spec. |
| [问：] 请推荐一些用于线路驱动的放大器，输出电流大于500mA，工作频率在40kHz-30MHz. |
[答：]Could you tell us.which application ?
Which Vdss level do you request ? |
| [问：] 请问：有适合100W至400W功率的高压钠灯电子镇流器用的控制电路和功率MOS管吗？ |
| [答：]How large operating voltage? |
| [问：] Hitachi的控制集成电路的技术与别的公司的同类技术相比有什么不同的特色。我正在准备设计城市智能的交通网络系统，硬件的控制电路选用Hitachi的产品有什么好处呢？ |
[答：](1) Hitachi is good at New Bi-CMOS process, It is good for Power Supply
IC
(2) Hitachi can offer total solution including Power MOS FET. |
| [问：] 隔离驱动的方式（全桥）？ |
| [答：](1) Isolated method is transformer into secondary and primary., |
| [问：] 用于低电压大电流状况下的典型运用及设计注意点 |
| [答：](1) Low Rds(on) and Low Input capacitance Power MOS FET is suitable
for Low voltage and High current application.
Main applications are DC/DC power supply for network server and VRM. |
| [问：] 请问MOS场效应晶体管的输出电流是多大？ |
| [答：]It depends on what device. It is different from device to device. |
| [问：] 您认为日立开关电源功率MOS场效应晶体管和控制集成电路与同类产品相比，它的优势在哪？谢谢！ |
| [答：](1) Hitachi has new pkg of LFPAK . It is reduced for Power loss (
for low Ron) and SW loss compared other PKG, The Pkg is unique for Hitachi
and benefit. |
| [问：] 日立开关电源功率MOS场效应晶体管和控制集成电路，可以胜任正5伏正负12伏用以嵌入式pc104微机及控制板约为100瓦的高可靠有过压过流软启动的电源吗？该晶体管和控制集成电路有什么特点？ |
| [答：](1) We have the IC such as HA16107/HA16141/HA16142 have a function
of OVP/ OCP and Soft start. |
| [问：] 对于HAT2134H，GAET端在芯片内部的串联电阻有多大？ |
| [答：]Gate resistance of HAT2134H is nearly 1 ohm. |
| [问：] 实际应用中，如果MOSFET的GATE端有超过20V的电压尖峰是否允许？对此尖峰的幅度、单个尖峰的时间、多个尖峰的重复数量如何评估？ |
[答：]Usually we think no problem under 24Vpeak that use VGSS guarantee
+/-20V type.
This depends on devices.
According to Hitachi Power MOSFET
3 kind of devices type line-up now.
1.VGSS=+/-30V High voltage
2.VGSS=+/-20V
3.VGSS=+/-12V |
| [问：] 这款新型集成电路提供什么措施来减少通损问题? |
| [答：]What IC you refer to? (in which page of IC Presenation?) |
| [问：] 那些因素容易导致MOSFET内部的寄生三极管导通？ |
[答：]If the dv/dt is so high operation, sometimes ON.
Especially for high voltage power mosfet use.
Low voltage MOSFET under VDSS=100V has no problem.
But recently,Also Hitachi Power MOSFET solve this problem for high voltage. |
| [问：] 您的产品曾在哪些UPS或电源产品中试验过? |
| [答：]We have tested in many UPS and Power supply |
| [问：] 用N沟道场管做直流线性稳压时如何减少输入输出的压差 |
[答：]This depends on power MOSFET package.
Because the dessipation Pd=(Vin-Vout)*Id
The RDS(on) is not requirement.
The most important is channel dessipation of power MOSFET. |
[问：] 1、开关电源功率MOS场效应晶体管工作在高频(20KHz/5A)、大电流时，其散热问题如何解决？
2、有无高频特性好、热量小的MOS场效应管？
谢谢！ |
[答：]The most important characteristics of this condition is On
resistance RDS(on). So you must choose Low RDS(on) MOSFET.
If the high frequency operation, you must choose Low Qgd and Low thermal
resistance type MOSFET. Because switching loss is increase. |
| [问：] 你好请问你们的MOS管主要的优点在那里？使用在多大功率的电源上？如何获得更详细的资料？谢谢！ |
| [答：]Hiatchi low voltage mosfet has low RDS(on), low loss characteristics.
You can send us e-mail to our web site to get further information. |
[问：] 1.请对比一下日立MOS管与IR,NS,IXY同类产品的主要不同之处(每种有两点即可)
2.日立MOS管更适合的哪种电路模式,为什么? |
[答：]High voltage series
Fundamental same characteristics.
We have line-up built-in FRD
MOSFET.
Low Voltage series
We have New Package Line-up LFPAK.
Good point is less Qg and Qgd
characteristics. |
| [问：] Have you boost IC? |
| [答：]Have. Hitachi part numbers are HA16120 and HA16121 |
| [问：] 请问设计一个50A/-48V高频开关整流电源，需要贵司的什么器件，价位 如何？ |
[答：]It depends on the application.
What are the Vdss level and operating frequency ? What is the actual drain
current of the MOSFET ? |
| [问：] 日立的新封装的LFPAK技术在同类的厂商中是专利吗？ |
| [答：]Yes Hitachi possesses that patent. Actually Hitachi has many technology
patents in mosfets and control ICs |
| [问：] 采用新封装LFPAK技术比SOP8技术先进在那里？ |
| [答：]LFPAK has lower thermal resistance, RDS(on),low inductance, and pin-to-pin
compatible |
| [问：] 介绍的这些原理我都感到很清楚。但不知功率MOSFET是指出口功率器件，还是包括控制电路的一个整体组件？ |
| [答：]Hitachi has most single mosfet, but we are also developing mosfet
with drive circuit built-in now. |
| [问：] 请问日立公司有那些好的DC-DC，我想找一些两路输出的DC-DC芯片，输入电压要求是0。7V-3V左右的，不知道日立公司有没有 |
| [答：]HA16116 is two output DC/DC IC. However the minmum.input voltage is
3.0-4.0V . |
| [问：] 日立是不是将逐渐退出AC/DC IC的开发？ |
| [答：]We still develop AC/DC IC. |
| [问：] 日立发表一种P沟道功率MOS场效应管，其导通电阻能降低多少？谢谢 |
| [答：]Pls tell us which mosfet you refer to. |
| [问：] 该产品的核心技术是什么？ |
| [答：]Which product? |
| [问：] mosfet如何解决低驱动损耗和低开关损耗？ |
[答：]If the low voltage drive use. You must choose low voltage drive MOSFET.
See below.
1.Logic level MOSFET
4V Drive or 2.5V Drive
You can see data sheet RDS(on)
test condition.
and see the characteristics
VGS VS RDS(on) or VDS(on).
2.If you use high frequency > 200KHz
You must choose Low Qq MOSFET.
Hitachi MOFET is Low RDS(on)
& Low Qg. |
| [问：] 请问贵公司的驱动芯片都有哪些型号, 有无电流及温度检测功能? |
| [答：]We don't have driver IC. |
| [问：] 日立开关电源功率MOS场效应晶体管在散热冷却方面有否独到创意和特别效果? |
| [答：]One of the the advantage pakage is LFPAK. |
| [问：] 请问日立开关在汽车应用方面的资料在什么地方可以下载到，谢谢！ |
[答：]Whitch detail application use for automotive ?
EPS or ABS, Airbag, ECU ? |
| [问：] 电源设计中，零电流开机有无新的方案？ |
| [答：]We don't have zeo current SW IC |
| [问：] 开关MOS场效应晶体管具有类同的增益—带宽乘积不必筛选分频，但其内阻是否相对较大? |
| [答：]Please state more clearly yr question |
| [问：] 能具体谈一下如何作为网络服务器电源吗？ |
| [答：]We have a HA16141 and HA16341 for Network server application, It is
sutable for non stop power supply system, |
| [问：] 在移动通信领域，该电源的有什么特殊的作用？ |
| [答：]What power power you say? (in which page) |
| [问：] PWM IC 的输出过压状态是否可以保持 |
| [答：](1) Plesae use the OVP latch function is necessary . |
[问：] 当设计一个48V（DC）转换成12V（DC），平均负载电流8A的电路时，请问：MOS管后面连接的电感及电容的设计要求，电感量和容值如何计算？
谢谢。 |
| [答：](1) It is complicated question. We will answer later. |
| [问：] 功率MOS场效应晶体管GDS的封装形式与其它有什么区别？ |
| [答：]What GDS? Pls tell us first. |
| [问：] VRM将来的发展趋势一节中，将来要需要多长时间？ |
| [答：]Please state more clear about this question. Do you refer it to VRM
IC or VRM product? |
[问：] 日立公司在线专家，您好。
我想请教一下场效应晶体管输出电容对谐振变频器零电压开关的影响？谢谢！ |
[答：](1) Sorry ,we can't understand your question.
Please ask clealy. |
| [问：] PWM过压保护的理论基础是什么？ |
[答：](1) OVP function is necessary in case of the failure of feedback loop.
(2) OVP works when the feedback loop is open |
| [问：] 贵公司的产品能不能达到军品的要求，特别是在高温低温环境下的工作。 |
| [答：]No |
| [问：] 请问： HITACHI 何时可以量产UPAK PKG，2.5V-1%-36Vmax；SHUNT REGULATOR
PRODUCT。THANKS！ |
| [答：]HA17431HUP |
| [问：] 请解释（n+1）冗余度的含义？ |
| [答：]A kind of power system that has set of similar (N + 1) power converter
units, in which N converters practically work (one more converter guarantees
no system down). Current sharing and hot-swap functions are necessary. |
| [问：] 请问：就shunt regulator 性能而言： HITACHI MPAK-5 PACKAGE
是否比MPAK-3 有优势？ |
| [答：](1) It is up to your application. MPAK-5 has a terminal for photo
diode. |
| [问：] 贵公司的产品能在那些电源系统上使用？ |
| [答：](1) It is used mainly PC/Desk top (AC/DC), Server (AC/DC) and Telecom
(DC/DC) |
| [问：] 贵公司的产品能不能达到军品的要求，特别是在高温低温环境下的工作。 |
| [答：]Sorry No! |
| [问：] 请问DC HA16150封装尺寸？ |
| [答：]This pkg is TSSOP-16 and DIP-16. |
| [问：] 是否有控制IC与功率MOSFET集成一体的产品 |
| [答：]We don't have combined IC with MOS-FET and control. |
| [问：] 用场管作同步整流时，空载损耗较大如何产生的如何解决？ |
[答：]If the output load is very low.
Gate drive loss parcentage is increased. |
| [问：] 怎样获取贵公司产品用于小型马达驱动的资料？ |
| [答：]We have no IC for small motor application and no material. |
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@[02-3-21 下午 12:43:17] |
