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CS8101YD8G Scheda tecnica(PDF) 5 Page - ON Semiconductor |
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CS8101YD8G Scheda tecnica(HTML) 5 Page - ON Semiconductor |
5 / 13 page CS8101 http://onsemi.com 5 TYPICAL PERFORMANCE CHARACTERISTICS Load (mA) 0 10 20 3040 5060 7080 Figure 2. CS8101 Dropout Voltage vs. Load Over Temperature 0.6 0.5 0.4 0.3 0.2 0.1 0 25 °C 90 100 125 C −40 °C ° CIRCUIT DESCRIPTION VOLTAGE REFERENCE AND OUTPUT CIRCUITRY Output Stage Protection The output stage is protected against overvoltage, short circuit and thermal runaway conditions (Figure 3). Figure 3. Typical Circuit Waveforms for Output Stage Protection IOUT Load Dump VIN VOUT Current Limit Short Circuit > 30 V If the input voltage rises above 30 V (e.g. load dump), the output shuts down. This response protects the internal circuitry and enables the IC to survive unexpected voltage transients. Should the junction temperature of the power device exceed 180 °C (typ) the load current capability is reduced thereby preventing thermal overload. This thermal management function is an effective means to prevent die overheating since the load current is the principle heat source in the IC. REGULATOR CONTROL FUNCTIONS The CS8101 contains two microprocessor compatible control functions: ENABLE and RESET (Figure 4). Figure 4. Circuit Waveform (1) = No Reset Delay Capacitor VIN VOUT ENABLE RESET (2) = With Reset Delay Capacitor VRLO VRPEAK VRPEAK For 7.0 V < VIN < 26 V VIN(H) VRH VRL (1) (2) ENABLE Function The ENABLE function switches the output transistor ON and OFF. When the voltage on the ENABLE lead exceeds 1.4 V typ, the output pass transistor turns off, leaving a high impedance facing the load. The IC will remain in Sleep mode, drawing only 50 mA, until the voltage on this input drops below the ENABLE threshold. RESET Function A RESET signal (low voltage) is generated as the IC powers up until VOUT is within 250 mV of the regulated output voltage, or when VOUT drops out of regulation, and is lower than 300 mV below the regulated output voltage. A hysteresis of 50 mV is included in the function to minimize oscillations. |
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