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| 型号： | EVAL-ADUM3471EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 26/36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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ADuM3470/ADuM3471/ADuM3472/ADuM3473/ADuM3474
Data Sheet
N S V ISO + V D
+ V D
N S 2
N S V ISO + V D
TRANSFORMER DESIGN
Custom transformers were designed for use in the circuits shown
in Figure 38, Figure 39, and Figure 40 (see Table 18). The trans-
formers designed for use with the ADuM347x differ from other
transformers used with isolated dc-to-dc converters that do not
regulate the output voltage. The output voltage is regulated by a
PWM controller in the ADuM347x that varies the duty cycle of
the primary side switches in response to a secondary side feed-
back voltage, V FB , received through an isolated digital channel.
The internal controller has a maximum duty cycle of 40%.
TRANSFORMER TURNS RATIO
To determine the transformer turns ratio—taking into account
the losses for the primary switches and the losses for the secondary
diodes and inductors—the external transformer turns ratio for
the ADuM347x can be calculated using Equation 1.
= (1)
N P V DD1 ( MIN ) × D × 2
where:
N S / N P is the primary to secondary turns ratio.
V ISO is the isolated output supply voltage.
V D is the Schottky diode voltage drop (0.5 V maximum).
V DD1 (MIN) is the minimum input supply voltage.
D is the duty cycle = 0.30 for a 30% typical duty cycle (40% is
the maximum duty cycle).
2 is a multiplier factor used for the push-pull switching cycle.
For the circuit shown in Figure 38 using the 5 V to 5 V reference
design in Table 18 and with V DD1 (MIN) = 4.5 V, the turns ratio is
N S /N P = 2.
For a 3.3 V input to 3.3 V output isolated single power supply
and with V DD1 (MIN) = 3.0 V, the turns ratio is also N S /N P = 2.
Therefore, the same transformer turns ratio, N S /N P = 2, can be
used for the three single power applications: 5 V to 5 V, 5 V to
3.3 V, and 3.3 V to 3.3 V.
The circuit shown in Figure 39 uses double windings and diode
pairs to create a doubler circuit; therefore, half the output voltage,
V ISO /2, is used, as shown in Equation 2.
Table 18. Transformer Reference Designs
V ISO
= (2)
N P V DD1 ( MIN ) × D × 2
where:
N S / N P is the primary to secondary turns ratio.
V ISO is the isolated output supply voltage. V ISO /2 is used because
the circuit uses two pairs of diodes, creating a doubler circuit.
V D is the Schottky diode voltage drop (0.5 V maximum).
V DD1 (MIN) is the minimum input supply voltage.
D is the duty cycle = 0.30 for a 30% typical duty cycle (40% is
the maximum duty cycle).
2 is a multiplier factor used for the push-pull switching cycle.
For the circuit shown in Figure 39 using the 5 V to 15 V reference
design in Table 18 and with V DD1 (MIN) = 4.5 V, the turns ratio is
N S /N P = 3.
The circuit shown in Figure 40 also uses double windings and
diode pairs to create a doubler circuit. However, because a
positive and negative output voltage are created, V ISO is used,
and the external transformer turns ratio can be calculated using
Equation 3.
= (3)
N P V DD1 ( MIN ) × D × 2
where:
N S / N P is the primary to secondary turns ratio.
V ISO is the isolated output supply voltage.
V D is the Schottky diode voltage drop (0.5 V maximum).
V DD1 (MIN) is the minimum input supply voltage.
D is the duty cycle = 0.35 for a 35% typical duty cycle (40% is
the maximum duty cycle).
2 is a multiplier factor used for the push-pull switching cycle.
For the circuit shown in Figure 40, the duty cycle, D, is set to 0.35
for a 35% typical duty cycle to reduce the maximum voltages seen
by the diodes for a ±15 V supply.
For the circuit shown in Figure 40 using the +5 V to ±15 V refer-
ence design in Table 18 and with V DD1 (MIN) = 4.5 V, the turns
ratio is N S /N P = 5.
Turns Ratio,
ET Constant
Total Primary
Total Primary
Isolation
Isolation
Part No.
JA4631-BL
JA4650-BL
KA4976-AL
TGSAD-260V6LF
TGSAD-290V6LF
TGSAD-292V6LF
TGAD-260NARL
TGAD-290NARL
TGAD-292NARL
Manufacturer
Coilcraft
Coilcraft
Coilcraft
Halo Electronics
Halo Electronics
Halo Electronics
Halo Electronics
Halo Electronics
Halo Electronics
PRI:SEC
1CT:2CT
1CT:3CT
1CT:5CT
1CT:2CT
1CT:3CT
1CT:5CT
1CT:2CT
1CT:3CT
1CT:5CT
(V × μs Min)
18
18
18
14
14
14
14
14
14
Inductance (μH)
255
255
255
389
389
389
389
389
389
Resistance (Ω)
0.2
0.2
0.2
0.8
0.8
0.8
0.8
0.8
0.8
Voltage (rms)
2500
2500
2500
2500
2500
2500
1500
1500
1500
Type
Basic
Basic
Basic
Supplemental
Supplemental
Supplemental
Functional
Functional
Functional
Reference
Rev. A | Page 26 of 36
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