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I NTEGRATED C IRCUITS D IVISION
4. Device Configuration
CPC1590
V I N
CPC1590
8
CAP
1
4
N C
N C
7 A
LOAD
+V LOAD
R LED
2
5
C ST
G
3
6 B
-V LOAD
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:
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:
P D = I F2 ? R LED
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.
R LED =
V IN - (V F + V OL )
I F
4.2 Storage Capacitor
? 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.
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:
C ST > Q G / 0.5V
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
R01
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