Datasheet > ADUM4120-1ARIZ-RL

ADUM4120-1ARIZ-RL

更新时间： 2022-05-14 22:14:47

品牌	Logo	应用领域
亚德诺 - ADI		栅
页数	文件大小	规格书
17页	308K
描述
Isolated, Precision Gate Drivers with 2 A Output

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ADUM4120-1ARIZ-RL 数据手册

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Data Sheet

ADuM4120/ADuM4120-1

THEORY OF OPERATION

Gate drivers are required in situations where fast rise times of

switching device gates are desired. The gate signal for most

enhancement type power devices are referenced to a source or

emitter node. The gate driver must be able to follow this source

or emitter node, necessitating isolation between the controlling

signal and the output of the gate driver in topologies where the

source or emitter nodes swing, such as a half bridge. Gate switching

times are a function of the drive strength of the gate driver. Buffer

stages before a CMOS output reduce total delay time and

increase the final drive strength of the driver.

layers of polyimide isolation. The encoding scheme used by the

ADuM4120/ADuM4120-1 is a positive logic on/off keying (OOK),

meaning a high signal is transmitted by the presence of the carrier

frequency across the iCoupler chip scale transformer coils. Positive

logic encoding ensures that a low signal is seen on the output

when the input side of the gate driver is not powered. A low state is

the most common safe state in enhancement mode power devices,

driving in situations where shoot through conditions can exist.

The architecture is designed for high common-mode transient

immunity and high immunity to electrical noise and magnetic

interference. Radiated emissions are minimized with a spread

spectrum OOK carrier and other techniques such as differential

coil layout. Figure 20 illustrates the encoding used by the

ADuM4120/ADuM4120-1.

The ADuM4120/ADuM4120-1 achieve isolation between the

control side and the output side of the gate driver by means of

a high frequency carrier that transmits data across the isolation

barrier using iCoupler chip scale transformer coils separated by

REGULATOR

RECEIVER

TRANSMITTER

OUT

GND

Figure 20. Operational Block Diagram of OOK Encoding

Rev. 0 | Page 12 of 17

1...9 10 111213 14 15...17

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