参数资料
| 型号： | SP6134HEU-L |
| 厂商： | Exar Corporation |
| 文件页数： | 10/15页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 10-MSOP |
| 标准包装： | 50 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 690kHz |
| 占空比： | 100% |
| 电源电压： | 4.5 V ~ 5.5 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
| 其它名称： | 1016-1525-5 SP6134HEU-L-ND |
S P 6 1 3 4 H
H i g h V o l t a g e , 6 0 0 k H z S y n c h r o n o u s P W M S t e p D o w n
C o n t r o l l e r
P CH ( max ) = R DS ( ON ) I OUT ( max ) D
P CL ( max ) = R DS ( ON ) I OUT ( max ) ( 1 ? D )
T J ( max ) = T A ( max ) +
MOSFET S ELECTION
The losses associated with MOSFETs can be
divided into conduction and switching losses.
Conduction losses are related to the on
resistance of MOSFETs, and increase with the
load current. Switching losses occur on each
on/off transition when the MOSFETs
experience both high current and voltage.
Since the bottom MOSFET switches current
from/to a paralleled diode (either its own body
diode or a Schottky diode), the voltage across
the MOSFET is no more than 1V during
switching transition. As a result, its switching
losses are negligible. The switching losses are
difficult to quantify due to all the variables
affecting turn on/ off time. However, the
following equation provides an approximation
on the switching losses associated with the top
MOSFET driven by SP6134H.
P SH ( max ) = 12 C rss V IN ( max ) I OUT ( max ) F S
where
Crss = reverse transfer capacitance of the top
MOSFET
Switching losses need to be taken into account
for high switching frequency, since they are
directly proportional to switching frequency.
The conduction losses associated with top and
bottom MOSFETs are determined by:
2
2
where
PCH(max) = conduction losses of the high side
MOSFET
PCL(max) = conduction losses of the low side
lowering the RDS(ON) of the MOSFETs always
improves efficiency even though it gives rise
to higher switching losses due to increased
Crss.
Top and bottom MOSFETs experience unequal
conduction losses if their on time is unequal.
For applications running at large or small duty
cycle, it makes sense to use different top and
bottom MOSFETs. Alternatively, parallel
multiple MOSFETs to conduct large duty
factor.
RDS(ON) varies greatly with the gate driver
voltage. The MOSFET vendors often specify
RDS(ON) on multiple gate to source voltages
(VGS), as well as provide typical curve of
RDS(ON) versus VGS. For 5V input, use the
RDS(ON) specified at 4.5V VGS. At the time of
this publication, vendors, such as Fairchild,
Siliconix and International Rectifier, have
started to specify RDS(ON) at VGS less than
3V. This has provided necessary data for
designs in which these MOSFETs are driven
with 3.3V and made it possible to use
SP6134H in 3.3V only applications.
Thermal calculation must be conducted to
ensure the MOSFET can handle the maximum
load current. The junction temperature of the
MOSFET, determined as follows, must stay
below the maximum rating.
P MOSFET ( max )
R θ JA
where
TA(max) = maximum ambient temperature
PMOSFET(max) = maximum power dissipation
of the MOSFET
MOSFET
R Θ JA = junction
to
ambient
thermal
RDS(ON) = drain to source on resistance.
The total power losses of the top MOSFET are
the sum of switching and conduction losses.
For synchronous buck converters of efficiency
over 90%, allow no more than 4% power
losses for high or low side MOSFETs. For input
voltages of 3.3V and 5V, conduction losses
often dominate switching losses. Therefore,
resistance.
R Θ JA of the device depends greatly on the
board layout, as well as device package.
Significant thermal improvement can be
achieved in the maximum power dissipation
through the proper design of copper mounting
pads on the circuit board. For example, in a
SO-8 package, placing two 0.04 square inches
? 2008 Exar Corporation
10/15
Rev. 2.0.0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6134HEU-L/TR | 功能描述:电压模式 PWM 控制器 High Voltage,600 kHz Synchronous RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| SP6134HV | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Dual Supply Synchronous Buck Controller |
| SP6134HVLED | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP6134HVLEDEB | 功能描述:电源管理IC开发工具 Dual Supply Sync Buck Controller RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| SP6136 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Evaluation Board Manual |
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