Datasheet > 驱动程序和接口 > MOSFET 驱动器> ADuM3221WBRZ

ADuM3221WBRZ

更新时间： 2024-02-07 09:32:51

品牌	Logo	应用领域
亚德诺 - ADI		驱动器栅极栅极驱动
页数	文件大小	规格书
16页	614K
描述
Isolated, 4 A Dual-Channel Gate Driver

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技术参数
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ADuM3221WBRZ 技术参数

是否无铅：	含铅	是否Rohs认证：	符合
生命周期：	Active	包装说明：	SOP, SOP8,.25
针数：	8	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.55	Is Samacsys：	N
内置保护：	TRANSIENT; OVER VOLTAGE; THERMAL; UNDER VOLTAGE	高边驱动器：	NO
接口集成电路类型：	BUFFER OR INVERTER BASED PERIPHERAL DRIVER	JESD-30 代码：	R-PDSO-G8
JESD-609代码：	e3	长度：	4.9 mm
湿度敏感等级：	3	功能数量：	2
端子数量：	8	最高工作温度：	125 °C
最低工作温度：	-40 °C	最大输出电流：	0.23 A
标称输出峰值电流：	4 A	封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装等效代码：	SOP8,.25
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
峰值回流温度（摄氏度）：	260	筛选级别：	AEC-Q100
座面最大高度：	1.75 mm	最大压摆率：	17 mA
最大供电电压：	5.5 V	最小供电电压：	3 V
标称供电电压：	3.3 V	电源电压1-最大：	18 V
电源电压1-分钟：	4.5 V	电源电压1-Nom：	10 V
表面贴装：	YES	技术：	CMOS
温度等级：	AUTOMOTIVE	端子面层：	Matte Tin (Sn)
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	30
断开时间：	0.72 µs	接通时间：	0.72 µs
宽度：	3.9 mm	Base Number Matches：	1

ADuM3221WBRZ 数据手册

Data Sheet

ADuM3220/ADuM3221

100

Output ringing can be reduced by adding a series gate resistor

to dampen the response. For applications that use a load of 1 nF

or less, it is recommended that a series gate resistor of about 5 Ω

be added. As shown in Figure 7, R_GATEis 5 Ω, which yields a

calculated Q factor of about 0.3. Figure 7 illustrates a damped

response in comparison with Figure 6.

DC CORRECTNESS AND MAGNETIC FIELD IMMUNITY

0.1

Positive and negative logic transitions at the isolator input cause

narrow (~1 ns) pulses to be sent to the decoder via the transformer.

The decoder is bistable and is, therefore, either set or reset by the

pulses, indicating input logic transitions. In the absence of logic

transitions of more than 1 µs at the input, a periodic set of refresh

pulses indicative of the correct input state is sent to ensure dc

correctness at the output.

0.01

0.001

10k

100k

10M

100M

MAGNETIC FIELD FREQUENCY (Hz)

Figure 22. Maximum Allowable External Magnetic Flux Density

If the decoder receives no internal pulses for more than about

3 µs, the input side is assumed to be unpowered or nonfunc-

tional, in which case the isolator output is forced to a default

low state by the watchdog timer circuit. In addition, the outputs

are in a low default state while the power is rising before the

UVLO threshold is crossed.

For example, at a magnetic field frequency of 1 MHz, the maxi-

mum allowable magnetic field of 0.2 kgauss induces a voltage

of 0.25 V at the receiving coil. This is about 50% of the sensing

threshold and does not cause a faulty output transition. Simi-

larly, if such an event were to occur during a transmitted pulse

(and had the worst-case polarity), the received pulse is reduced

from >1.0 V to 0.75 V, still well above the 0.5 V sensing thresh-

old of the decoder.

The ADuM3220/ADuM3221 are immune to external magnetic

fields. The limitation on the ADuM3220/ADuM3221 magnetic

field immunity is set by the condition in which induced voltage

in the transformer receiving coil is sufficiently large to either

falsely set or reset the decoder. The following analysis defines

the conditions under which this can occur. The 3 V operating

condition of the ADuM3220/ADuM3221 is examined because

it represents the most susceptible mode of operation. The pulses

at the transformer output have an amplitude greater than 1.0 V.

The decoder has a sensing threshold at about 0.5 V, therefore

establishing a 0.5 V margin in which induced voltages can be

tolerated. The voltage induced across the receiving coil is given by

The preceding magnetic flux density values correspond to

specific current magnitudes at given distances away from the

ADuM3220/ADuM3221 transformers. Figure 23 expresses

these allowable current magnitudes as a function of frequency

for selected distances. As shown, the ADuM3220/ADuM3221

are immune and can be affected only by extremely large currents

operated at a high frequency very close to the component. For

the 1 MHz example, a 0.5 kA current must be placed 5 mm

away from the ADuM3220/ADuM3221 to affect the operation

of the component.

1000

V = (−dβ/dt) ∑ πr_n; n = 1, 2, ... , N

DISTANCE = 1m

where:

100

β is the magnetic flux density (gauss).

r_nis the radius of the nth turn in the receiving coil (cm).

N is the number of turns in the receiving coil.

Given the geometry of the receiving coil in the ADuM3220/

ADuM3221 and an imposed requirement that the induced

voltage be, at most, 50% of the 0.5 V margin at the decoder,

a maximum allowable magnetic field is calculated, as shown

in Figure 22.

DISTANCE = 100mm

DISTANCE = 5mm

0.1

0.01

10k

100k

10M

100M

MAGNETIC FIELD FREQUENCY (Hz)

Figure 23. Maximum Allowable Current for Various

Current-to-ADuM3220/ADuM3221 Spacings

Rev. C | Page 13 of 16

1...10 11 121314 15 16

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