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CPC1590PTR

P1-P3P4-P6P7-P9P10-P10
I
NTEGRATED
C
IRCUITS
D
IVISION
CPC1590
R01 www.ixysic.com 7
4. Device Configuration
4.1 LED resistor
The input resistor is required to limit LED current to a
value set by Recommended Operating Conditions in
“Recommended Operating Conditions” on page 3. In some
cases, higher LED operating current would improve
driver speed; however, this higher current could also
reduce LED lifespan, which would cause reliability
issues.
The general equation used to calculate the resistor
value is:
• I
F
= Input Control Current
• V
OL
= Low-level output of the driving logic gate or the
collector-emitter voltage of the driving logic transis-
tor. (This parameter is provided in the manufacturer’s
data sheet.)
• V
IN
= Input Power Source
• V
F
= Forward Voltage Drop of LED
• R
LED
= Input Resistor
When calculating the resistor value, the designer
should take into consideration power-supply
variations, which can range about ±10%, temperature
variations from -40°C to +85°C, LED forward voltage
drop over the temperature range, and the resistor’s
tolerance and temperature stability rating.
When the LED resistor value is selected by the above
formula, the R
LED
power dissipation, P
D
, can be
obtained from the following equation:
With power dissipation calculated, it is now possible to
select an appropriate resistor size that can be used in
the particular application circuit. It is recommended
that a resistor with at least twice the calculated power
rating should be selected.
4.2 Storage Capacitor
The storage capacitor (C
ST
) enables the gate driver to
turn on a power MOSFET faster by delivering a
reservoir of charge to the gate. Selection of the
storage capacitor is given by the following equation:
This equation shows that the storage capacitor needs
to deliver enough charge to the gate while only
dropping 0.5V. The CPC1590 can deliver 32nC of
charge at rated operating speed, and will operate with
much larger loads, >4nF, with slower turn-on and
turn-off times.
The CPC1590 has an internal J-FET, which is used to
regulate the voltage applied to the storage capacitor.
The voltage applied to the storage capacitor will be
2
3
1
4
NC
NC
8
5
6
7
CPC1590
CAP
+V
LOAD
G
-V
LOAD
C
ST
A
B
R
LED
V
IN
LOAD
R
LED
=
V
IN
- (V
F
+ V
OL
)
I
F
P
D
= I
F
2
• R
LED
C
ST
> Q
G
/ 0.5V
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CPC1590
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between 10V and 16V. The capacitor’s voltage rating
should be two to three times this range.
The designer should select the storage capacitor
based on the particular application requirements. If the
final product requires operating at a higher ambient
temperature range of -40°C to +110°C, then it is better
to select COG/NPO capacitors in order to meet
minimum capacitance requirements.
4.3 Transistor Selection
The CPC1590 charges and discharges an external
MOSFET transistor. The selection of the MOSFET is
determined by the user to meet the specific power
requirements for the load. The CPC1590 output
voltage is listed in the specification, but, as mentioned
earlier, there must be little or no gate leakage.
Another parameter that plays a significant role in the
selection of the transistor is the gate drive voltage
available from the part. The CPC1590 uses
photovoltaic cells to collect the optical energy
generated by the internal LED; to generate more
voltage, the photovoltaic diodes are stacked. As such,
the voltage of the photovoltaic stack reduces with
increased temperature. The user must select a
transistor that will maintain the load current at the
maximum temperature, given the V
GS
in the CPC1590
specifications.
5. CPC1590 Used as an AC Switch
The CPC1590 can be used in other configurations.
One typical configuration is shown in Figure 3, which
is called an AC Switch. This simply means that either
terminal can be positive or negative. This configuration
requires a second MOSFET (Q2) and two rectifying
diodes (D1 and D2).
The design considerations are identical for this
application. Diodes D1 and D2 must have voltage
ratings greater than the breakdown voltage of the
MOSFETs.
Figure 3. Application Circuit for Using the CPC1590 as an AC Switch
6. Conclusion
See IXYS Integrated Circuits Division’s Application Note, AN-202, for a thorough discussion, and for examples of
device usage, component selection, and over-voltage protection circuitry.
2
3
1
4
NC
NC
8
5
6
7
CPC1590
LED +
LED -
V
CAP
V
G
C
ST
+/- V
LOAD
+/- V
LOAD
Q1
Q2
LOAD
V
L1
V
L2
D2
D1
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CPC1590
R01 www.ixysic.com 9
7. Manufacturing Information
7.1 Moisture Sensitivity
All plastic encapsulated semiconductor packages are susceptible to moisture ingression. IXYS Integrated
Circuits Division classified all of its plastic encapsulated devices for moisture sensitivity according to the
latest version of the joint industry standard, IPC/JEDEC J-STD-020, in force at the time of product
evaluation. We test all of our products to the maximum conditions set forth in the standard, and guarantee
proper operation of our devices when handled according to the limitations and information in that standard as well as
to any limitations set forth in the information or standards referenced below.
Failure to adhere to the warnings or limitations as established by the listed specifications could result in reduced
product performance, reduction of operable life, and/or reduction of overall reliability.
This product carries a Moisture Sensitivity Level (MSL) rating as shown below, and should be handled according to
the requirements of the latest version of the joint industry standard IPC/JEDEC J-STD-033.
7.2 ESD Sensitivity
This product is ESD Sensitive, and should be handled according to the industry standard
JESD-625.
7.3 Reflow Profile
This product has a maximum body temperature and time rating as shown below. All other guidelines of
J-STD-020 must be observed.
7.4 Board Wash
IXYS Integrated Circuits Division recommends the use of no-clean flux formulations. However, board washing to
remove flux residue is acceptable. Since IXYS Integrated Circuits Division employs the use of silicone coating as an
optical waveguide in many of its optically isolated products, the use of a short drying bake may be necessary if a wash
is used after solder reflow processes. Chlorine-based or Fluorine-based solvents or fluxes should not be used.
Cleaning methods that employ ultrasonic energy should not be used.
Device Moisture Sensitivity Level (MSL) Rating
CPC1590P MSL 1
Device Maximum Temperature x Time
CPC1590P 260°C for 30 seconds
e
3
Pb
P1-P3P4-P6P7-P9P10-P10

CPC1590PTR

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Manufacturer:
IXYS Integrated Circuits
Description:
Logic Output Optocouplers Optically Isolated Gate Driver
Lifecycle:
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