HCPL-7560-300 Avago Technologies US Inc., HCPL-7560-300 Datasheet - Page 14

• Manufacturer Part Number: HCPL-7560-300
• Description: OPTOCOUPLER MODULE 8-SMD GW
• Manufacturer: Avago Technologies US Inc.
• Series: -r
• Type: Sigma-Delta Modulatorr

Specifications of HCPL-7560-300

• Voltage - Isolation: 3750Vrms
• Input Type: DC
• Voltage - Supply: 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: Contains lead / RoHS non-compliant

Power Supplies and Bypassing
The recommended application circuit is shown in
Figure 17. A floating power supply (which in many ap-
plications could be the same supply that is used to
drive the high-side power transistor) is regulated to 5
V using a simple zener diode (D1); the value of resistor
R1 should be chosen to supply sufficient current from
the existing floating supply. The voltage from the cur-
rent sensing resistor or shunt (Rsense) is applied to the
input of the HCPL-7560 (U2) through an RC anti-aliasing
filter (R2 and C2). And finally, the output clock and data
of the isolated modulator are connected to the digital
interface IC. Although the application circuit is relatively
simple, a few recommendations should be followed to
ensure optimal performance.
The power supply for the isolated modulator is most
often obtained from the same supply used to power the
power transistor gate drive circuit. If a dedicated supply
is required, in many cases it is possible to add an ad-
ditional winding on an existing transformer. Otherwise,
some sort of simple isolated supply can be used, such
as a line powered transformer or a high-frequency DC-
DC converter.
Figure 17. Recommended Application Circuit.
14
MOTOR
R SENSE
+
-
HV+
HV-
GATE DRIVE
R2 39Ω
FLOATING
POSITIVE
SUPPLY
CIRCUIT
5.1 V
D1
R1
0.1 µF
0.01 µF
C1
C2
V
V
V
GND1
DD1
IN+
IN-
HCPL-7560
An inexpensive 78L05 three-terminal regulator can also
be used to reduce the floating supply voltage to 5 V. To
help attenuate high-frequency power supply noise or
ripple, a resistor or inductor can be used in series with
the input of the regulator to form a low-pass filter with
the regulator’s input bypass capacitor.
As shown in Figure 17, 0.1µF bypass capacitors (C1 and
C3) should be located as close as possible to the input
and output power-supply pins of the isolated modula-
tor (U2). The bypass capacitors are required because of
the high-speed digital nature of the signals inside the
isolated modulator. A 0.01µF bypass capacitor (C2) is
also recommended at the input due to the switched-
capacitor nature of the input circuit. The input bypass
capacitor also forms part of the anti-aliasing filter, which
is recommended to prevent high-frequency noise from
aliasing down to lower frequencies and interfering with
the input signal.
MCLK
MDAT
GND2
V
DD2
+ 5 V
0.1 µF
C3
CCLK
CLAT
CDAT
MCLK1
MDAT1
MCLK2
MDAT2
GND
HCPL-0872
RESET
CHAN
SCLK
SDAT
OVR1
THR1
V
DD
CS
TO
CONTROL
CIRCUIT