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CS8161YT5G Datasheet(PDF) 7 Page - ON Semiconductor |
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CS8161YT5G Datasheet(HTML) 7 Page - ON Semiconductor |
7 / 11 page CS8161 http://onsemi.com 7 Figure 17. Typical Circuit Waveform 14 V 0 V 0 V 2.0 V 0.8 V VIN ENABLE VOUT1 VOUT2 60 V 12 V 5.0 V 34 V 12 V 2.4 V 3.0 V 26 V 12 V 0 V 12 V 5.0 V 12 V 14V 0 V Load Dump Low VIN Line Noise, Etc. VOUT1 Short Circuit VOUT1 Thermal Shutdown Turn Off Turn On 2.4 V VOUT2 Short Circuit 0 V 0 V 0 V 5.0 V APPLICATION DIAGRAM Figure 18. Application Diagram CS8161 VOUT1 VOUT2 ENABLE GND VIN + + * C1 required if regulator is located far from power supply filter. ** C2, C3 required for stability, value may be increased. Capacitor must operate at minimum temperature expected. C1* 0.1 mF C2* 22 mF C3* 22 mF Tuner Display APPLICATION NOTES Since both outputs are controlled by the same ENABLE, the CS8161 is ideal for applications where a sleep mode is required. Using the CS8161, a section of circuitry such as a display and nonessential 5.0 V circuits can be shut down under microprocessor control to conserve energy. The example in the Applications Diagram (Figure 18) shows an automotive radio application where the display is powered by the 12 V on VOUT1 and the Tuner IC is powered by the 5.0 V on VOUT2. Neither output is required unless both the ignition and the Radio On/Off switch are on. Stability Considerations The output or compensation capacitor (Application diagram C2 and C3) helps determine three main characteristics of a linear regulator: startup delay, load transient response and loop stability. 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 cheapest 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. |
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