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参数资料
| 型号： | EVAL-ADUM3070EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADUM3070 |
| 标准包装： | 1 |
| 系列： | iCoupler® |
| 主要目的： | 板，隔离式电源 |
| 输出及类型： | 3，隔离 |
| 输出电压： | 5V，7.5V，15V |
| 输入电压： | 5V |
| 频率 - 开关： | 500kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ADuM3070 |
Evaluation Board User Guide
TRANSFORMER SELECTION
The EVAL-ADuM3070EBZ supports multiple transformer
options. The double supply is equipped with a Halo TGSAD-
290V6LF (T3) or a Coilcraft JA4650-BL (T4) 1:3 turns ratio
transformer. The Coilcraft footprint is directly to the left of the
Halo footprint (see the ADuM3070 data sheet for a details on
transformer selection with the ADuM3070 ). Figure 12 and
90
80
70
60
50
40
UG-402
Figure 14 show the supply’s efficiency with a Coilcraft and a
Halo transformer, respectively, at different switching frequencies.
SWITCHING FREQUENCY OPTIONS
The resistor connected from the ADuM3070 OC pin to ground
sets the double supply switching frequency. Figure 4 shows the
30
20
10
0
0
10
20
30
40
50
60
70
80
T A = –40°C
T A = +25°C
T A = +105°C
90 100 110 120 130 140
relationship between this resistance and the converter switching
frequency. The EVAL-ADuM3070EBZ can be configured with
0 ?, 0805 resistors to four different preset switching frequen-
cies. Short-circuiting R26 sets R28 (300 k?) and R29 (150 k?)
in parallel, and short-circuiting R27 sets R28 and R30 (100 k?)
in parallel. Table 4 lists the switching frequencies that can be
selected by short- or open-circuiting R26 and R27. The user can
select a different switching frequency by removing R26 and R27
and then choosing R28 based on Figure 4. The board is config-
ured for the 500 kHz setting by default. Figure 12 and Figure 14
show how the switching frequency affects the efficiency with
either transformer installed. Figure 13 shows how temperature
LOAD CURRENT (mA)
Figure 13. 5 V In to 15 V Out Efficiency with the 1:3 Coilcraft Transformer at
500 kHz and Various Temperatures
90
80
70
60
50
40
30
affects efficiency.
Table 4. Switching Frequency Selection
20
10
T A = –40°C
T A = +25°C
T A = +105°C
R26
R27
R OC
Switching Frequency
0
0
10
20
30
40
50
60
70
80
90 100 110 120 130 140
Open
0?
Open
0?
Open
Open
0?
0?
300 k?
100 k?
75 k?
50 k?
200 kHz
500 kHz
700 kHz
1 MHz
LOAD CURRENT (mA)
Figure 14. 5 V In to 15 V Out Efficiency with the 1:3 Halo Transformer at
Various Switching Frequencies
80
90
80
70
70
60
50
60
40
50
30
40
20
30
20
10
f SW = 1MHz
f SW = 700kHz
f SW = 500kHz
f SW = 200kHz
10
0
0
5
10
15
20
25
30
35
40
45
5V IN TO 12V OUT
5V IN TO 15V OUT
50 55 60 65
70
0
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140
LOAD CURRENT (mA)
Figure 12. 5 V In to 15 V Out Efficiency with the 1:3 Coilcraft Transformer at
LOAD CURRENT (mA)
Figure 15. Double Supply Efficiency with the 1:5 Coilcraft Transformer for
Different Output Options at 500 kHz
Various Switching Frequencies
Rev. 0 | Page 7 of 12
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