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| 型号： | EVAL-ADUM3070EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 6/12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
DOUBLE SUPPLY
The second power supply implemented with the ADuM3070 on
this evaluation board is a double supply. This circuit, which is
shown in Figure 10, is located on the top half of the board. The
ADuM3070 data sheet also describes the ADuM3070 in this
configuration. Figure 17 shows the schematic.
Figure 10. Double Supply Configuration
In its default configuration, the double supply provides a regulated
15 V output and an unregulated 7.5 V output, which are isolated
from the 5 V primary input supply. The double supply is capa-
ble of delivering up to 140 mA to external loads. The isolated
data channels on Side 2 load the secondary isolated supply and
reduce the total available current. The double supply can be
reconfigured as 12 V (regulated) and 6 V (unregulated) secondary
isolated supplies or as positive and negative supplies. See the
Other Secondary Isolated Supply Configurations section for
more details.
Figure 11. Double Supply Terminals
TERMINALS
The double supply has terminal blocks on Side 1 (the primary/
power supply input side) and Side 2 (the secondary/power supply
output side). A 4.3 mm isolation barrier separates Side 1 and
Side 2. Figure 11 shows these terminals. Table 3 summarizes the
functions of the terminal connections. They are described in
detail in the Input Power Connections and Output Power
Connections sections.
Evaluation Board User Guide
and V DDA are bypassed by a 47 μF ceramic capacitor (C7) and a
0.1 μF local bypass capacitor (C8) located close to the ADuM3070 .
R25, R31, C14, and C15 are provided for an optional and
unpopulated snubber, which can be used to reduce radiated
emissions.
Output Power Connections
Output loads can be connected to P7 and P9, labeled VISO1
and VISO2, respectively, in the schematic and +7.5V/6V and
+15/12V, respectively, on the silkscreen, which are the isolated,
unregulated 7.5 V and regulated 15 V output supplies. Connect
the return of the load to P8 and P10, which are labeled GND
ISO on the silkscreen and GND4 in the schematic.
Side 2 is powered by the secondary isolated 15 V supply. The
ADuM3070 internal low dropout regulator converts this voltage
to 5 V. The regulated 5 V supply powers the ADuM3070 secondary
side. Therefore, the ADuM3070 V REG pin is 15 V and the V DD2
pin is 5 V. The 15 V supply connects to P9. The 7.5 V supply
connects to P7, which is labeled +7.5V/6V on the silkscreen and
VISO1 on the schematic. The Side 2 ground reference is tied to
P10. Note that the single and double supplies do not share
grounds, although they have the same names on the silkscreen.
The two supplies are isolated from each other with a greater than
15 mm gap. See the ADuM3070 data sheet for an explanation of
the double supply theory of operation. Figure 12 through Figure 15
show efficiency curves for the double supply with the +15/+12 V
isolated output supply connected to V REG .
Powering V REG from the Unregulated 7.5 V Supply
V REG can be powered by the unregulated 7.5 V supply, which
results in higher efficiency. However, when the 15 V supply is
unloaded, the unregulated 7.5 V supply may drop to about 3 V,
which may not be high enough to power the ADuM3070
secondary side. This may cause the double supply to run open
loop, leaving the 15 V supply unregulated. Using 15 V for V REG
ensures that the secondary side of the ADuM3471 powers up
under light load conditions. Move the 0 ?, 0805 resistor from
R19 to R20 to power Side 2 from the 7.5 V supply.
Care must be taken to avoid driving the V DD2 output because
this can result in permanent damage to the ADuM3070 .
Table 3. Double Supply Terminal Function Descriptions
Terminal Pin Label Description
P5 1 +5V IN Side 1 5 V primary input supply
Input Power Connections
Connect 5 V to P5, labeled +5V IN. Connect the supply
negative to P6, labeled GND (GND3 on the schematic). These
are the only off-board connections required for the double
supply to function.
V DD2 supplies the voltage to the transformer primary and to the
P6
P7
P8
P9
P10
1
1
1
1
1
GND
+7.5V/6V
GND ISO
+15V/12V
GND ISO
Side 1 ground reference
Side 2 7.5 V secondary isolated
supply (regulated)
Side 2 ground reference
Side 2 15 V secondary isolated
supply (regulated)
Side 2 ground reference
ADuM3070 supply voltage, V DDA (see the ADuM3070 data sheet
for additional information about the V DDA pin function). V DD2
Rev. 0 | Page 6 of 12
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