HCPL-7560 Просмотр технического описания (PDF) - Avago Technologies
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HCPL-7560 Datasheet PDF : 18 Pages
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Table 3. Isotek (Isabellenhütte) Four-Terminal Shunt Summary.
Shunt
Resistor Part
Num
Maximum RMS
Shunt Resistance
Tol.
Current
mW
%
A
PBV-R050-0.5
50
0.5
3
PBV-R020-0.5
20
0.5
7
PBV-R010-0.5
10
0.5
14
PBV-R005-0.5
5
0.5
25 [28]
PBV-R002-0.5
2
0.5
39 [71]
Motor Power Range
120 Vac-440 Vac
hp
kW
0.8 - 3
0.6 - 2
2-7
0.6 - 2
4 - 14
3 - 10
7 - 25 [8 - 28] 5 - 19 [6 - 21]
11 - 39 [19 - 71] 8 - 29 [14 - 53]
Note: Values in brackets are with a heatsink for the shunt.
In some applications, however, supply currents flowing
through the power-supply return path may cause offset
or noise problems. In this case, better performance may
be obtained by connecting VIN+ and VIN- directly across
the shunt resistor with two conductors, and connecting
GND1 to the shunt resistor with a third conductor for
the power-supply return path, as shown in Figure 19.
When connected this way, both input pins should be
bypassed. To minimize electromagnetic interference of
the sense signal, all of the conductors (whether two or
three are used) connecting the isolated modulator to
the sense resistor should be either twisted pair wire or
closely spaced traces on a PC board.
The 39Ω resistor in series with the input lead (R2) forms
a lowpass anti-aliasing filter with the 0.01µF input
bypass capacitor (C2) with a 400 kHz bandwidth. The
resistor performs another important function as well;
it dampens any ringing which might be present in the
circuit formed by the shunt, the input bypass capacitor,
and the inductance of wires or traces connecting the
two. Undamped ringing of the input circuit near the
input sampling frequency can alias into the baseband
producing what might appear to be noise at the output
of the device.
FLOATING
POSITIVE
SUPPLY
HV+
GATE DRIVE
CIRCUIT
R1
MOTOR
+-
R SENSE
D1
5.1 V
R2a 39Ω
R2b 39Ω
C1
0.1 µF
C2a C2b
0.01 µF 0.01 µF
V DD1
V IN+
V IN-
GND1
V DD2
MCLK
MDAT
GND2
HCPL-7560
HV-
Figure 19. Schematic for Three Conductor Shunt Connection.
17
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