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CS8129 Datasheet(PDF) 5 Page - Cherry Semiconductor Corporation |
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CS8129 Datasheet(HTML) 5 Page - Cherry Semiconductor Corporation |
5 / 8 page The CS8129 function has hysteresis on both the reset and delay comparators, a latching Delay capacitor discharge circuit, and operates down to 1V. The circuit output is an open collector type with ON and OFF parameters as specified. The output NPN transistor is controlled by the two circuits described (see Block Diagram). This circuit monitors output voltage, and when output voltage is below the specified minimum causes the output transistor to be in the ON (saturation) state. When the output voltage is above the specified level, this circuit permits the output transistor to go into the OFF state if allowed by the Delay circuit. This circuit provides a programmable (by external capaci- tor) delay on the output lead. The Delay lead pro- vides source current to the external delay capacitor only when the "Low Voltage Inhibit" circuit indicates that out- put voltage is above VRT(ON). Otherwise, the Delay lead sinks current to ground (used to discharge the delay capacitor). The discharge current is latched ON when the output voltage is below VRT(OFF). The Delay capacitor is fully discharged anytime the output voltage falls out of regulation, even for a short period of time. This feature ensures a controlled pulse is generated following detection of an error condition. The circuit allows the output transistor to go to the OFF (open) state only when the voltage on the Delay lead is higher than VDC(HI). The Delay time for the function is calculated from the formula: Delay time = Delay time = CDelay(µF) x 3.2 x 105 If CDelay=0.1µF, Delay time (ms)=32ms ± 50%: i.e. 16ms to 48ms. The tolerance of the capacitor must be taken into account to calculate the total variation in the delay time. CDelay x VDelay Threshold ICharge RESET RESET RESET RESET Reset Delay Circuit RESET RESET RESET Low Voltage Inhibit Circuit RESET RESET RESET 5 (1) (2) (3) (2) Delay VOUT VRT(ON) VRT(OFF) VRH VDC(HI) VDC(LO) VDH tDelay VDIS VRL RESET (1) = No Delay Capacitor (2) = With Delay Capacitor (3) = Max: Voltage (1.0V) RESET Circuit Waveform RESET Circuit Functional Description RESET |
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Descripción similar - CS8129 |
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