PS9308L, PS9308L2 Chapter Title
R08DS0048EJ0200 Rev.2.00 Page 18 of 20
Sep 27, 2013
2. Cautions regarding noise
Be aware that when voltage is applied suddenly between the photocoupler’s input and output at startup, the output
transistor may enter the on state, even if the voltage is within the absolute maximum ratings.
USAGE CAUTIONS
1. This product is weak for static electricity by designed with high-speed integrated circuit so protect against static
electricity when handling.
2. Board designing
(1) By-pass capacitor of more than 1.0
μ
F is used between V
CC
and GND near device. Also, ensure that the distance
between the leads of the photocoupler and capacitor is no more than 10 mm.
(2) When designing the printed wiring board, ensure that the pattern of the IGBT collectors/emitters is not too close
to the input block pattern of the photocoupler.
If the pattern is too close to the input block and coupling occurs, a sudden fluctuation in the voltage on the IGBT
output side might affect the photocoupler’s LED input, leading to malfunction or degradation of characteristics.
(If the pattern needs to be close to the input block, to prevent the LED from lighting during the off state due to
the abovementioned coupling, design the input-side circuit so that the bias of the LED is reversed, within the
range of the recommended operating conditions, and be sure to thoroughly evaluate operation.)
(3) Pin 2 (which is an NC
*1
pin) can either be connected directly to the GND pin on the LED side or left open.
Unconnected pins should not be used as a bypass for signals or for any other similar purpose because this may
degrade the internal noise environment of the device.
Note: *1. NC: Non-Connection (No Connection).
3. Make sure the rise/fall time of the forward current is 0.5
μ
s or less.
4. In order to avoid malfunctions, make sure the rise/fall slope of the supply voltage is 3 V/
μ
s or less.
5. Avoid storage at a high temperature and high humidity.
