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CS8151D2R2G датащи(PDF) 8 Page - ON Semiconductor |
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CS8151D2R2G датащи(HTML) 8 Page - ON Semiconductor |
8 / 14 page CS8151 http://onsemi.com 8 APPLICATION NOTES Operation Without Watchdog The CS8151 can be operated without the watchdog functionality by connecting the WDI and Wake Up Pins. This will eliminate false resets from occurring. Without the connection, a reset would occur because a watchdog signal on WDI would not occur in the required time frame. The Wake Up Pin provides the watchdog signal into the WDI Pin. Figure 7. Device Operation Without Watchdog Function VIN CDelay VOUT WDI RESET GND CS8151 Microprocessor Wake Up CDelay C1 C2 VCC RESET Battery Output Stage Protection The output stage is protected against overvoltage, short circuit and thermal runaway conditions (see Figure 8). If the input voltage rises above the overvoltage shutdown threshold (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 power transistor is turned off. Thermal shutdown is an effective means to prevent die overheating since the power transistor is the principle heat source in the IC. Figure 8. Typical Circuit Waveforms for Output Stage Protection VIN VOUT IOUT > 50 V Load Dump Short Circuit Thermal Shutdown Stability Considerations The output or compensation capacitor C2 (see Figure 9) helps determine three main characteristics of a linear regulator: startup delay, load transient response and loop stability. Figure 9. Test and Application Circuit Showing Output Compensation CS8151 VIN C1* 0.1 mF VOUT RESET C2** 10 mF *C1 required if regulator is located far from the power supply filter. **C2 required for stability. RRST The capacitor value and type should be based on cost, availability, size and temperature constraints. A tantalum or aluminum electrolytic capacitor is best, since a film or ceramic capacitor with almost zero ESR can cause instability. The aluminum electrolytic capacitor is the least expensive solution, but, if the circuit operates at low temperatures (−25 °C to −40°C), both the value and ESR of |
Аналогичный номер детали - CS8151D2R2G |
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Аналогичное описание - CS8151D2R2G |
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