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参数资料
| 型号： | ADP3418KRZ-REEL1 |
| 厂商： | Analog Devices, Inc. |
| 英文描述： | Dual Bootstrapped 12 V MOSFET Driver with Output Disable |
| 中文描述： | 12伏双自举MOSFET驱动器与输出禁用 |
| 文件页数： | 11/16页 |
| 文件大小： | 323K |
| 代理商： | ADP3418KRZ-REEL1 |
ADP3418
The MOSFET vendor should provide a maximum voltage slew
rate at drain current rating such that this can be designed
around. Once you have this specification, the next step is to
determine the maximum current you expect to see in the
MOSFET. This can be done with the following equation:
(
DC
MAX
VCC
phase
per
I
I
)
(
Rev. B | Page 11 of 16
)
OUT
MAX
MAX
×
OUT
L
f
D
V
×
+
=
(5)
Here, D
MAX
is determined for the VR controller being used with
the driver. Please note this current gets divided roughly equally
between MOSFETs if more than one is used (assume a worst-
case mismatch of 30% for design margin). L
OUT
is the output
inductor value.
When producing your design, there is no exact method for
calculating the dV/dt due to the parasitic effects in the external
MOSFETs as well as the PCB. However, it can be measured to
determine if it is safe. If it appears the dV/dt is too fast, an
optional gate resistor can be added between DRVH and the
high-side MOSFETs. This resistor will slow down the dV/dt, but
it will also increase the switching losses in the high-side
MOSFETs. The ADP3418 has been optimally designed with an
internal drive impedance that will work with most MOSFETs to
switch them efficiently yet minimize dV/dt. However, some
high-speed MOSFETs may require this external gate resistor
depending on the currents being switched in the MOSFET.
Low-Side (Synchronous) MOSFETs
The low-side MOSFETs are usually selected to have a low on-
resistance to minimize conduction losses. This usually implies a
large input gate capacitance and gate charge. The first concern is
to make sure the power delivery from the ADP3418’s DRVL
does not exceed the thermal rating of the driver (see the Flex-
mode controller data sheet for details).
The next concern for the low-side MOSFETs is based on
preventing them from inadvertently being switched on when
the high-side MOSFET turns on. This occurs due to the drain-
gate (Miller, also specified as C
rss
) capacitance of the MOSFET.
When the drain of the low-side MOSFET is switched to VCC by
the high-side turning on (at a rate dV/dt), the internal gate of
the low-side MOSFET will be pulled up by an amount roughly
equal to VCC
×
(C
rss
/C
iss
). It is important to make sure this does
not put the MOSFET into conduction.
Another consideration is the non-overlap circuitry of the
ADP3418 which attempts to minimize the non-overlap period.
During the state of the high-side turning off to low-side turning
on, the SW pin is monitored (as well as the conditions of SW
prior to switching) to adequately prevent overlap.
However, during the low-side turn off to high-side turn on, the
SW pin does not contain information for determining the
proper switching time, so the state of the DRVL pin is
monitored to go below one sixth of VCC and then a delay is
added. But due to the Miller capacitance and internal delays of
the low-side MOSFET gate, one must ensure the Miller to input
capacitance ratio is low enough and the low-side MOSFET
internal delays are not large enough to allow accidental turn on
of the low-side when the high-side turns on.
A spreadsheet is available from ADI that will assist the designer
in the proper selection of low-side MOSFETs.
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|---|---|
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP3419 | 制造商:AD 制造商全称:Analog Devices 功能描述:Dual Bootstrapped, High Voltage MOSFET Driver with Output Disable |
| ADP34190091RMZR | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Dual Bootstrapped, High Voltage MOSFET Driver with Output Disable |
| ADP3419JRM-REEL | 功能描述:IC MOSFET DVR DUAL BOOTST 10MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - MOSFET，电桥驱动器 - 外部开关 系列:- 标准包装:95 系列:- 配置:半桥 输入类型:PWM 延迟时间:25ns 电流 - 峰:1.6A 配置数:1 输出数:2 高端电压 - 最大（自引导启动）:118V 电源电压:9 V ~ 14 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:管件 产品目录页面:1282 (CN2011-ZH PDF) 其它名称:*LM5104M*LM5104M/NOPBLM5104M |
| ADP3419JRMZ | 制造商:Analog Device 功能描述: 制造商:Analog Devices 功能描述:MOSFET Driver, Dual, 10 Pin, Plastic, TSSOP |
| ADP3419JRMZ-REEL | 功能描述:功率驱动器IC DUAL SYNCHRONOUS DRV RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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