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参数资料
| 型号： | EVAL-ADUM3070EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 4/12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 |
UG-402
The user can select a different switching frequency by removing
R10 and R11 and then choosing R1 based on Figure 4. The
board is configured for the 500 kHz setting by default. Figure 5
and Figure 7 show how the switching frequency affects the
supply’s efficiency with either transformer installed. Figure 6
shows how the efficiency curve varies over temperature with a
500 kHz switching frequency.
Table 2. Switching Frequency Selection
90
80
70
60
50
40
30
Evaluation Board User Guide
R10
Open
0?
R11
Open
Open
R OC
300 k?
100 k?
Switching Frequency
200 kHz
500 kHz
20
10
f SW = 1MHz
f SW = 700kHz
f SW = 500kHz
f SW = 200kHz
Open
0?
75 k?
700 kHz
0
0
50
100
150
200
250
300
350
400
450
500
0?
0?
50 k?
1 MHz
LOAD CURRENT (mA)
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
Figure 5. 5 V In to 5 V Out Efficiency with 1:2 Coilcraft Transformer at Various
Switching Frequencies
90
80
70
60
50
40
30
20
0
0
50 100 150 200 250 300 350 400 450
R OC ( ? )
Figure 4. Switching Frequency vs. R OC Resistance
500
10
0
0
50
100
150
200
250
300
350
T A = –40°C
T A = +25°C
T A = +105°C
400 450
500
OTHER INPUT AND ISOLATED OUTPUT SUPPLY
OPTIONS
The single supply can be configured to have a 3.3 V secondary
isolated supply with a 3.3 V or 5 V primary input supply. Short-
circuiting R4 by soldering a 0 ?, 0805 resistor to R9 sets the
output supply for 3.3 V. The voltage at the feedback node (the
FB pin of the ADuM3070 ) should be the desired output voltage
divided to approximately 1.25 V. Having R9 open-circuited sets
the secondary isolated supply to 5 V, and having it short-circuited
sets the supply to 3.3 V. See the ADuM3070 data sheet for more
details on setting the secondary isolated output supply voltage.
LOAD CURRENT (mA)
Figure 6. 5 V In to 5 V Out Efficiency with 1:2 Coilcraft Transformer at 500 kHz
over Temperature
90
80
70
60
50
40
30
Figure 8 shows how the single supply efficiency curve changes
when it is reconfigured for either of these supply options.
20
10
f SW = 1MHz
f SW = 700kHz
f SW = 500kHz
f SW = 200kHz
0
0
50
100
150
200
250
300
350
400
450
500
LOAD CURRENT (mA)
Figure 7. 5 V In to 5 V Out Efficiency with 1:2 Halo Transformer at Various
Switching Frequencies
Rev. 0 | Page 4 of 12
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