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CS8122YTHA5 Fiches technique(PDF) 6 Page - ON Semiconductor |
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CS8122YTHA5 Fiches technique(HTML) 6 Page - ON Semiconductor |
6 / 10 page CS8122 http://onsemi.com 6 Figure 12. RESET Circuit Waveform VRH (1) (2) (2) (3) VRL VDH VDC(HI) VDC(LO) DELAY tDELAY VDIS RESET VRT(OFF) VRT(ON) VOUT (1) = No Delay Capacitor (2) = With Delay Capacitor (3) = Max: RESET Voltage (1.0 V) CIRCUIT DESCRIPTION The CS8122 RESET function, has hysteresis on both the reset and delay comparators, a latching Delay capacitor discharge circuit, and operates down to 1.0 V. The RESET circuit output is an open collector type with ON and OFF parameters as specified. The RESET output NPN transistor is controlled by the two circuits described (see Block Diagram on page 2). Low Voltage Inhibit Circuit The Low Voltage Inhibit Circuit monitors output voltage, and when output voltage is below the specified minimum, causes the RESET output transistor to be in the ON (saturation) state. When the output voltage is above the specified level, this circuit permits the RESET output transistor to go into the OFF state if allowed by the RESET Delay circuit. Reset Delay Circuit The Reset Delay Circuit provides a programmable (by external capacitor) delay on the RESET output lead. The Delay lead provides source current to the external delay capacitor only when the Low Voltage Inhibit circuit indicates that output 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 that a controlled RESET pulse is generated following detection of an error condition. The circuit allows the RESET output transistor to go to the OFF (open) state only when the voltage on the Delay lead is higher than VDC(HI). Figure 13. Test Circuit CIN* 100 nF Delay VOUT RRST COUT** 10 mF RESET CS8122 *CIN is required if regulator is far from the power source filter. **COUT is required for stability. VIN GND 4.7 k W CDelay 0.1 mF |
Numéro de pièce similaire - CS8122YTHA5 |
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Description similaire - CS8122YTHA5 |
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