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| 型号： | EVAL-ADUM3471EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 27/36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
V DD1 ( MAX )
TRANSFORMER ET CONSTANT
The next transformer design factor to consider is the ET constant.
This constant determines the minimum V × μs constant of the
transformer over the operating temperature. ET values of 14 V × μs
and 18 V × μs were selected for the ADuM347x transformer
designs listed in Table 18 using the following equation:
ET ( MIN ) =
f SW ( MIN ) × 2
where:
V DD1 (MAX) is the maximum input supply voltage.
f SW (MIN) is the minimum primary switching frequency = 300 kHz
in startup.
2 is a multiplier factor used for the push-pull switching cycle.
TRANSFORMER PRIMARY INDUCTANCE AND
RESISTANCE
Another important characteristic of the transformer for designs
with the ADuM347x is the primary inductance. Transformers
for the ADuM347x are recommended to have between 60 μH to
100 μH of inductance per primary winding. Values of primary
inductance in this range are needed for smooth operation of the
ADuM347x pulse-by-pulse current-limit circuit, which can help
protect against a build-up of saturation currents in the transformer.
If the inductance is specified for the total of both primary wind-
ings, for example, as 400 μH, the inductance of one winding is
one-fourth of two equal windings, or 100 μH.
Another important characteristic of the transformer for designs
with the ADuM347x is primary resistance. Primary resistance as
low as is practical (less than 1 ?) helps to reduce losses and
improves efficiency. The dc primary resistance can be measured
TRANSFORMER ISOLATION VOLTAGE
Isolation voltage and isolation type should be determined for
the requirements of the application and then specified. The
transformers in Table 18 have been specified for 2500 V rms
for supplemental or basic isolation and for 1500 V rms functional
isolation. Other isolation levels and isolation voltages can be
specified and requested from the transformer manufacturers
listed in Table 18 or from other manufacturers.
SWITCHING FREQUENCY
The ADuM347x devices also have an open-loop mode where
the output voltage is not regulated and is dependent on the
transformer turns ratio, N S /N P , and the conditions of the output
including output load current and the losses in the dc-to-dc
converter circuit. This open-loop mode is selected when the OC
pin is connected high to the V DD2 pin. In open-loop mode, the
switching frequency is 318 kHz.
TRANSIENT RESPONSE
The load transient response of the ADuM347x output voltage for
for the application schematics in Figure 38 and Figure 39. The
response shown is slow but stable and can have more output
change than desired for some applications. The output voltage
change with load transient is reduced, and the output is shown
to remain stable by adding more inductance to the output circuits,
as shown in the second V ISO output waveform in Figure 30 to
add a 0.1 μF ceramic capacitor (C FB ) in parallel with the high
feedback resistor. This value helps to reduce the overshoot and
undershoot during load transients.
COMPONENT SELECTION
The ADuM347x digital isolators with 2 W dc-to-dc converters
require no external interface circuitry for the logic interfaces.
Power supply bypassing is required at the input and output supply
pins. Note that a low ESR ceramic bypass capacitor of 0.1 μF is
required on Side 1 between Pin 9 and Pin 10, and on Side 2
between Pin 18 and Pin 19, as close to the chip pads as possible.
The power supply section of the ADuM347x uses a high oscillator
frequency to efficiently pass power through the external power
transformer. In addition, normal operation of the data section of
the i Coupler introduces switching transients on the power supply
pins. Bypass capacitors are required for several operating frequen-
cies. Noise suppression requires a low inductance, high frequency
capacitor; ripple suppression and proper regulation require a large
value capacitor. To suppress noise and reduce ripple, large value
ceramic capacitors of X5R or X7R dielectric type are recom-
mended. The recommended capacitor value is 10 μF for V DD1 and
47 μF for V ISO . These capacitors have a low ESR and are available
in moderate 1206 or 1210 sizes for voltages up to 10 V. For output
voltages larger than 10 V, two 22 μF ceramic capacitors can be
used in parallel. See Table 19 for recommended components.
The ADuM347x switching frequency can be adjusted from
200 kHz to 1 MHz by changing the value of the R OC resistor
Table 19. Recommended Components
Part No. Manufacturer
Value
shown in Figure 38, Figure 39, and Figure 40. The value of the
R OC resistor needed for the desired switching frequency can be
determined from the switching frequency vs. R OC resistance curve
shown in Figure 9. The output filter inductor value and output
capacitor value for the ADuM347x application schematics have
been designed to be stable over the switching frequency range of
500 kHz to 1 MHz, when loaded from 10% to 90% of the maxi-
mum load.
GRM32ER71A476KE15L
GRM32ER71C226KEA8L
GRM31CR71A106KA01L
MBR0540T1G
LQH3NPN470MM0
ME3220-104KL
LQH6PPN470M43
LQH6PPN101M43
Murata
Murata
Murata
ON Semiconductor
Murata
Coilcraft
Murata
Murata
47 μF, 10 V, X7R, 1210
22 μF, 16 V, X7R, 1210
10 μF, 10 V, X7R, 1206
Schottky, 0.5 A, 40 V,
SOD-123
47 μH, 0.41 A, 1212
100 μH, 0.34 A, 1210
47 μH, 1.10 A, 2424
100 μH, 0.80 A, 2424
Rev. A | Page 27 of 36
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