HCPL-7520-560E Avago Technologies US Inc., HCPL-7520-560E Datasheet - Page 14
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HCPL-7520-560E
Manufacturer Part Number
HCPL-7520-560E
Description
Optocoupler
Manufacturer
Avago Technologies US Inc.
Datasheet
1.HCPL-7520-000E.pdf
(16 pages)
Specifications of HCPL-7520-560E
No. Of Channels
1
Isolation Voltage
3.75kV
Optocoupler Output Type
Analog
Input Current
16mA
Output Voltage
6V
Opto Case Style
SMD
No. Of Pins
8
Peak Reflow Compatible (260 C)
Yes
Reel Quantity
1000
Amplifier Type
Isolation
Number Of Circuits
1
-3db Bandwidth
100kHz
Current - Input Bias
600nA
Voltage - Input Offset
600µV
Current - Supply
11.7mA
Current - Output / Channel
16mA
Voltage - Supply, Single/dual (±)
4.5 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SMD Gull Wing
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Output Type
-
Slew Rate
-
Gain Bandwidth Product
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
HCPL-7520-560E
Manufacturer:
AVAGO
Quantity:
1 400
Figure 18. Motor output horsepower vs. motor phase current and supply
voltage.
When laying out a PC board for the current sensing
resistors, a couple of points should be kept in mind. The
Kelvin connections to the resistor should be brought
together under the body of the resistor and then run
very close to each other to the input of the HCPL-7520;
this minimizes the loop area of the connection and
reduces the possibility of stray magnetic fields from in-
terfering with the measured signal. If the sense resistor
is not located on the same PC board as the HCPL-7520
circuit, a tightly twisted pair of wires can accomplish
the same thing. Also, multiple layers of the PC board
can be used to increase current carrying capacity.
Numerous plated-through vias should surround each
non-Kelvin terminal of the sense resistor to help dis-
tribute the current between the layers of the PC board.
The PC board should use 2 or 4 oz. copper for the layers,
resulting in a current carrying capacity in excess of 20
A. Making the current carrying traces on the PC board
fairly large can also improve the sense resistor’s power
dissipation capability by acting as a heat sink. Liberal
use of vias where the load current enters and exits the
PC board is also recommended.
14
40
35
30
25
20
15
10
5
0
0
MOTOR PHASE CURRENT – A (rms)
5
10
440
380
220
120
15
20
25
30
35
Sense Resistor Connections
The recommended method for connecting the HCPL-
7520 to the current sensing resistor is shown in Figure
17. VIN+ (pin 2 of the HPCL-7520) is connected to the
positive terminal of the sense resistor, while VIN- (pin
3) is shorted to GND1 (pin 4), with the powersupply
return path functioning as the sense line to the negative
terminal of the current sense resistor. This allows a
single pair of wires or PC board traces to connect the
HCPL-7520 circuit to the sense resistor. By referenc-
ing the input circuit to the negative side of the sense
resistor, any load current induced noise transients on
the resistor are seen as a common- mode signal and
will not interfere with the current-sense signal. This
is important because the large load currents flowing
through the motor drive, along with the parasitic in-
ductances inherent in the wiring of the circuit, can
generate both noise spikes and offsets that are relative-
ly large compared to the small voltages that are being
measured across the current sensing resistor. If the same
power supply is used both for the gate drive circuit and
for the current sensing circuit, it is very important that
the connection from GND1 of the HCPL-7520 to the
sense resistor be the only return path for supply current
to the gate drive power supply in order to eliminate
potential ground loop problems. The only direct con-
nection between the HCPL-7520 circuit and the gate
drive circuit should be the positive power supply line.