전자부품 데이터시트 검색엔진 |
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CS8101YD8 데이터시트(PDF) 7 Page - ON Semiconductor |
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CS8101YD8 데이터시트(HTML) 7 Page - ON Semiconductor |
7 / 13 page CS8101 http://onsemi.com 7 APPLICATION NOTES VBAT SWITCH Q1 500 k W 0.1 mF 500 k W 100 k W 100 k W CRST COUT RRST VCC RESET I/O Port mP VOUT RESET ENABLE VIN Figure 6. Microprocessor Control of CS8101 Using External Switching Transistor Q1 CS8101 GND The ENABLE pin of the CS8101 can be tied to the battery voltage provided a series resistor is used as shown in Figure 7. The maximum allowed voltage on the ENABLE pin without the resistor is 10 V. Direct voltages greater than 10 V applied to the pin without the series resistor may damage the device. The system designer should note the turn−on threshold (typ 1.4 V) is on the ENABLE pin. The threshold will be higher on the other side of RENABLE. VBAT Figure 7. Using the ENABLE pin with VBAT 60 k ENABLE RENABLE 0.64 V ON/OFF Control 10 k 50 k STABILITY CONSIDERATIONS The output or compensation capacitor helps determine three main characteristics of a linear regulator: start−up delay, load transient response and loop stability. VIN Figure 8. Test and Application Circuit Showing Output Compensation CIN* 0.1 mF ENABLE VOUT RRST COUT** 10 mF RESET CS8101 *CIN required if regulator is located far from the power supply filter. *COUT required for stability. Capacitor must operate at minimum temperature expected. 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 the capacitor will vary considerably. The capacitor manufacturers data sheet usually provides this information. The value for the output capacitor COUT shown in Figure 8 should work for most applications, however it is not necessarily the optimized solution. |
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