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R5112x051D Datasheet(PDF) 11 Page - RICOH electronics devices division |
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R5112x051D Datasheet(HTML) 11 Page - RICOH electronics devices division |
11 / 34 page R5112S NO.EA-406-160420 11 Delay Operation and Released Output Delay Time (tdelay) CD Pin Threshold Voltage (VTCD) Released Voltage (+VDET) GND GND Detector Voltage (-VDET) Detect Output Delay Time (tPHL) Release Output Delay Time (tdelay) VOUT/ SENSE Pin CD Pin Voltage DOUT Pin Released Output Delay Timing Diagram When the operating voltage higher than the released voltage is applied to VOUT pin (R5112SxxxD) or SENSE pin (R5112SxxxB), charge to an external capacitor starts, then CD pin voltage (VCD) increases. DOUT pin (R5112SxxxB/D) maintains the released output until VCD reaches the threshold voltage of the release output delay pin (VTCD). And when VCD is over VTCD, DOUT pin is inverted from “L” to “H”. That is, the charged external capacitor starts discharging. When the operating voltage lower than the detector threshold is applied to VOUT pin/SENSE pin, the detect output delay time, which is the time until the output voltage is inverted from “H” to “L”, remains constant independent of the external capacitor. Released Output Delay Time Released Output Delay Time (tdelay) is determined by the following formula. CD (F) represents capacitance of the external capacitor tdelay (s) = 0.73 × CD (F) / (1.2 × 10-6) Use 100 pF or higher CD when allowing this device to detect VOUT/SENSE pin decreasing slower than 0.1 V/s. Released Output Delay Time indicates the time between the instance when VOUT pin (R5112SxxxD) or SENSE pin (R5112SxxxB) shifts from “1.5 V” to “ −VDET + 2.0 V” by the application of a pulse voltage and the instance when the output voltage reaches 2.5 V after pulled up DOUT pin (R5112SxxxB/D) to 5.0 V with a resistor of 100 k Ω. -VDET +2.0V 1.5V VOUT/SENSE GND 5.0V 2.5V GND DOUT tdelay tPHL |
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