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参数资料
| 型号： | EVAL-ADUM3471EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 31/36页 |
| 文件大小： | 0K |
| 描述： | EVALUATION MODULE FOR ADUM3471 |
| 标准包装： | 1 |
| 系列： | iCoupler® |
| 主要目的： | 接口，数字式隔离器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | ADuM3470，ADuM3471，ADuM3472，ADuM3473，ADuM3474 |
| 主要属性： | 2 个独立的 ADuM347x 电路 |
| 次要属性： | 3.3 V ~ 5.5 V 电源 |
| 已供物品： | 板 |
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Data Sheet
ADuM3470/ADuM3471/ADuM3472/ADuM3473/ADuM3474
Because the rate of charge of the secondary side is dependent
on the soft start cycle, loading conditions, input voltage, and
output voltage level selected, care should be taken in the design
to allow the converter to stabilize before valid data is required.
When power is removed from V DD1 , the primary side converter
and coupler shut down when the UVLO level is reached. The
secondary side stops receiving power and starts to discharge.
The outputs on the secondary side hold the last state that they
received from the primary side until either the UVLO level is
reached and the outputs are placed in their default low state,
or the outputs detect a lack of activity from the inputs and the
outputs are set to their default value before the secondary power
reaches UVLO.
INSULATION LIFETIME
All insulation structures eventually break down when subjected
to voltage stress over a sufficiently long period. The rate of insu-
lation degradation is dependent on the characteristics of the voltage
waveform applied across the insulation. Analog Devices conducts
an extensive set of evaluations to determine the lifetime of the
insulation structure within the ADuM347x devices.
Accelerated life testing is performed using voltage levels higher
than the rated continuous working voltage. Acceleration factors
for several operating conditions are determined, allowing calcu-
lation of the time to failure at the working voltage of interest.
Bipolar ac voltage is the most stringent environment. A 50-year
operating lifetime under the bipolar ac condition determines the
maximum working voltage recommended by Analog Devices.
In the case of unipolar ac or dc voltage, the stress on the insulation
is significantly lower. This allows operation at higher working
voltages while still achieving a 50-year service life. The working
voltages listed in Table 11 can be applied while maintaining the
50-year minimum lifetime, provided that the voltage conforms
to either the unipolar ac or dc voltage cases. Treat any cross-
or Figure 48 as a bipolar ac waveform, and limit its peak voltage
The voltage presented in Figure 48 is shown as sinusoidal for
illustration purposes only. It is meant to represent any voltage
waveform varying between 0 V and some limiting value. The
limiting value can be positive or negative, but the voltage cannot
cross 0 V.
RATED PEAK VOLTAGE
0V
Figure 46. Bipolar AC Waveform
RATED PEAK VOLTAGE
The values shown in Table 11 summarize the peak voltages for
50 years of service life in several operating conditions. In many
cases, the working voltage approved by agency testing is higher
0V
Figure 47. DC Waveform
than the 50-year service life voltage. Operation at working
leads to premature insulation failure.
The insulation lifetime of the ADuM347x depends on the voltage
waveform type imposed across the isolation barrier. The i Coupler
insulation structure degrades at different rates, depending on
voltage waveforms.
Rev. A | Page 31 of 36
RATED PEAK VOLTAGE
0V
Figure 48. Unipolar AC Waveform
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