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CS8164YTHA5 Scheda tecnica(PDF) 6 Page - ON Semiconductor |
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CS8164YTHA5 Scheda tecnica(HTML) 6 Page - ON Semiconductor |
6 / 8 page 6 to bias VOUT2 up to this point. Approximately 60µA will suffice, resulting in a 10k Ω external resistor for most appli- cations. Unlike the standby regulated output, which must remain on whenever possible, the high current regulated output is fault protected against overvoltage and also incorporates thermal shutdown. If the input voltage rises above approximately 30V (e.g., load dump), this output will automatically shutdown. This protects the internal circuit- ry and enables the IC to survive higher voltage transients than would otherwise be expected. Thermal shutdown is effective against die overheating since the high current out- put is the dominant source of power dissipation in the IC. The enable function controls VOUT1 When ENABLE is high (5V), VOUT1 is on. When ENABLE is low, VOUT1 is off. ENABLE High Current Output Circuit Description: continued VIN VOUT2 RD 10k Ω C3 + VOUT2 Disabling VOUT2 when it is not needed. C3 is no longer needed. CS8164 C1* 0.1 µF ENABLE VIN VOUT1 Gnd C3** 10 µF + + 10 µF C2** VOUT2 Test & Application Circuit Application Notes NOTES: * C1 required if regulator is located far from power supply filter. ** C2, C3 required for stability. The output or compensation capacitor helps determine three main characteristics of a linear regulator: start-up 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 instabil- ity. The aluminum electrolytic capacitor is the least expen- sive solution, but, if the circuit operates at low tempera- tures (-25°C to -40°C), both the value and ESR of the capacitor will vary considerably. The capacitor manufac- turers data sheet usually provides this information. The value for each output capacitor shown in the test and applications circuit should work for most applications, however it is not necessarily the optimized solution. To determine acceptable values for C2 and C3 a particular application, start with a tantalum capacitor of the recom- mended value and work towards a less expensive alterna- tive part for each output. Step 1: Place the completed circuit with the tantalum capacitors of the recommended values in an environmen- tal chamber at the lowest specified operating temperature and monitor the outputs with an oscilloscope. A decade box connected in series with the capacitor C2 will simulate the higher ESR of an aluminum capacitor. Leave the decade box outside the chamber, the small resistance added by the longer leads is negligible. Step 2: With the input voltage at its maximum value, increase the load current slowly from zero to full load on the output under observation. look for oscillations on the output. If no oscillations are observed, the capacitor is large enough to ensure a stable design under steady state conditions. Stability Considerations |
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