Note 3: Switching time measurement circuit and waveform.
TPS842A(F)
VOL.REG.
TPS842A(F),TPS844(F)
AMP
(INFRARED LED)
(TPS842A(F))
TPS844(F)
VOL.REG.
AMP
(INFRARED LED)
(TPS844(F))
Precautions
• When you consider a combined use with an LED, be sure to use an infrared LED. Visible rays in wavelength of
less than 700 nm cannot be detected.
• Make sure the shielding plate that is used to detect positions is manufactured from materials with superior
light-shielding characteristics. Insufficient shield can cause malfunction.
• Photo ICs contain a high-sensitivity amplifier. Toshiba recommends connecting a capacitor of about 0.01 μF that
has good high-frequency characteristics between VCC and GND near the device to prevent unwanted oscillation.
• Please install so that disturbance light is not irradiated by these products.
When disturbance light (incandescence light etc.) 700 nm or more is detected, it may incorrect-operate. Please
perform sufficient evaluation and verification by set.
• During 100 μs after turning on VCC, output voltage changes for stabilizing the inner circuit.
3
2007-10-01