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参数资料
| 型号： | IXDD409YI |
| 厂商： | IXYS CORP |
| 元件分类： | 功率晶体管 |
| 英文描述： | 9 Amp Low-Side Ultrafast MOSFET Driver |
| 中文描述： | 9 A BUF OR INV BASED MOSFET DRIVER, PSSO5 |
| 封装： | TO-263, D2PAK-5 |
| 文件页数： | 9/10页 |
| 文件大小： | 259K |
| 代理商： | IXDD409YI |
9
IXDD409PI / 409SI / 409YI / 409CI IXDI409PI / 409SI / 409YI / 409CI
IXDN409PI / 409SI / 409YI / 409CI
Supply Bypassing and Grounding Practices,
Output Lead inductance
When designing a circuit to drive a high speed MOSFET
utilizing the IXDD409/IXDI409/IXDN409, it is very important to
keep certain design criteria in mind, in order to optimize
performance of the driver. Particular attention needs to be paid
to
Supply Bypassing
,
Grounding
, and minimizing the
Output
Lead Inductance
.
Say, for example, we are using the IXDD409 to charge a
5000pF capacitive load from 0 to 25 volts in 25ns…
Using the formula: I=
V C /
t, where
V=25V C=5000pF &
t=25ns we can determine that to charge 5000pF to 25 volts
in 25ns will take a constant current of 5A. (In reality, the charging
current won’t be constant, and will peak somewhere around
8A).
SUPPLY BYPASSING
In order for our design to turn the load on properly, the IXDD409
must be able to draw this 5A of current from the power supply
in the 25ns. This means that there must be very low impedance
between the driver and the power supply. The most common
method of achieving this low impedance is to bypass the
power supply at the driver with a capacitance value that is a
magnitude larger than the load capacitance. Usually, this
would be achieved by placing two different types of bypassing
capacitors, with complementary impedance curves, very close
to the driver itself. (These capacitors should be carefully
selected, low inductance, low resistance, high-pulse current-
service capacitors). Lead lengths may radiate at high frequency
due to inductance, so care should be taken to keep the lengths
of the leads between these bypass capacitors and the IXDD409
to an absolute minimum.
GROUNDING
In order for the design to turn the load off properly, the IXDD409
must be able to drain this 5A of current into an adequate
grounding system. There are three paths for returning current
that need to be considered: Path #1 is between the IXDD409
and it’s load. Path #2 is between the IXDD409 and it’s power
supply. Path #3 is between the IXDD409 and whatever logic
is driving it. All three of these paths should be as low in
resistance and inductance as possible, and thus as short as
practical. In addition, every effort should be made to keep these
three ground paths distinctly separate. Otherwise, (for
instance), the returning ground current from the load may
develop a voltage that would have a detrimental effect on the
logic line driving the IXDD409.
OUTPUT LEAD INDUCTANCE
Of equal importance to Supply Bypassing and Grounding are
issues related to the Output Lead Inductance. Every effort
should be made to keep the leads between the driver and it’s
load as short and wide as possible. If the driver must be placed
farther than 2” from the load, then the output leads should be
treated as transmission lines. In this case, a twisted-pair
should be considered, and the return line of each twisted pair
should be placed as close as possible to the ground pin of the
driver, and connect directly to the ground terminal of the load.
The enable (EN) input to the IXDD409 is a high voltage
CMOS logic level input where the EN input threshold is V
,
and may not be compatible with 5V CMOS or TTL input levels.
The IXDD409 EN input was intentionally designed for
enhanced noise immunity with the high voltage CMOS logic
levels. In a typical gate driver application, V
=15V and the
EN input threshold at 7.5V, a 5V CMOS logical high input
applied to this typical IXDD409 application’s EN input will be
misinterpreted as a logical low, and may cause undesirable
or unexpected results. The note below is for optional
adaptation of TTL or 5V CMOS levels.
The circuit in Figure 27 alleviates this potential logic level
misinterpretation by translating a TTL or 5V CMOS logic input
to high voltage CMOS logic levels needed by the IXDD409 EN
input. From the figure, V
is the gate driver power supply,
typically set between 8V to 20V, and V
is the logic power
supply, typically between 3.3V to 5.5V. Resistors R1 and R2
form a voltage divider network so that the Q1 base is
positioned at the midpoint of the expected TTL logic transition
levels.
A TTL or 5V CMOS logic low, V
=~<0.8V, input applied to
the Q1 emitter will drive it on. This causes the level translator
output, the Q1 collector output to settle to V
+
V
=<~2V, which is sufficiently low to be correctly
interpreted as a high voltage CMOS logic low (<1/3V
CC
=5V for
V
CC
=15V given in the IXDD409 data sheet.)
A TTL high, V
=>~2.4V, or a 5V CMOS high,
V
=~>3.5V, applied to the EN input of the circuit in
Figure 27 will cause Q1 to be biased off. This results in Q1
collector being pulled up by R3 to V
=15V, and provides a
high voltage CMOS logic high output. The high voltage CMOS
logical EN output applied to the IXDD409 EN input will enable
it, allowing the gate driver to fully function as an 8 Amp output
driver.
The total component cost of the circuit in Figure 27 is less
than $0.10 if purchased in quantities >1K pieces. It is
recommended that the physical placement of the level
translator circuit be placed close to the source of the TTL or
CMOS logic circuits to maximize noise rejection.
Figure 27 - TTL to High Voltage CMOS Level Translator
TTL to High Voltage CMOS Level Translation
(IXDD409 Only)
10K
R3
3.3K
R2
Q1
2N3904
EN
Output
(To IXDD409
EN Input)
CC
(From Gate Driver
Power Supply)
Input)
TTL
CMOS
3.3K
R1
V
DD
(From Logic
Power Supply)
or
High Voltage
相关PDF资料 |
PDF描述 |
|---|---|
| IXDI409CI | 9 Amp Low-Side Ultrafast MOSFET Driver |
| IXDI409PI | 9 Amp Low-Side Ultrafast MOSFET Driver |
| IXDI409SI | 9 Amp Low-Side Ultrafast MOSFET Driver |
| IXDN402 | 2 Ampere Dual Low-Side Ultrafast MOSFET Drivers |
| IXDN402PI | 2 Ampere Dual Low-Side Ultrafast MOSFET Drivers |
相关代理商/技术参数 |
参数描述 |
|---|---|
| IXDD414CI | 功能描述:功率驱动器IC 40V 14A 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 |
| IXDD414PI | 功能描述:功率驱动器IC 40V 14A 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 |
| IXDD414SI | 功能描述:功率驱动器IC 14 Amps 40V 1 Rds 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 |
| IXDD414YI | 功能描述:功率驱动器IC 40V 14A 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 |
| IXDD415 | 制造商:IXYS 制造商全称:IXYS Corporation 功能描述:Dual 15 Ampere Low-Side Ultrafast MOSFET Driver |
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