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CS8135YTHA5 Datasheet(PDF) 6 Page - ON Semiconductor |
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CS8135YTHA5 Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 8 page 6 Application Notes 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 insta- bility. The aluminum electrolytic capacitor is the least expensive solution, but, if the circuit operates at low tem- peratures (-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 output capacitor C2 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 for a partic- ular application, start with a tantalum capacitor of the rec- Stability Considerations S1 ON/OFF RESET FLAG R1 20k Ω C1* 0.1 µF RESET/ ENABLE VIN VOUT1 Gnd VOUT2 C3** 10 µF + + 10 µF C2 ** CS8135 NOTES: * C1 required if regulator is located far from power supply filter. ** C2, C3 required for stability. Test & Application Circuit Disabling VOUT2 when it is not needed. C3 is no longer needed. 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 approx- imately 30V (e.g., load dump), this output will automatical- ly shutdown. This protects the internal circuitry and enables the IC to survive higher voltage transients than would otherwise be expected. Thermal shutdown is effec- tive against die overheating since the high current output is the dominant source of power dissipation in the IC. The function has the ability to serve a dual purpose if desired. When controlled in the manner shown in the test circuit (common in automotive systems where /ENABLE is connected to the ignition switch), the lead also serves as an output flag that is active low when- ever a fault condition is detected with the high current regulated output. Under normal operating conditions, the output voltage of this lead is high (5V). This is set by an internal clamp. If the high current output becomes unreg- ulated for any reason (line transients, short circuit, thermal shutdown, low input voltage, etc.) the lead switches to the active low state, and is capable of sinking several mil- liamps. This output signal can be used to initiate any reset or start-up procedure that may be required of the system. The lead can also be driven directly from logic cir- cuits. The only requirement is that the 20k Ω pull-up resis- tor remain in place. This will not affect the logic gate since the voltage on this lead is limited by the internal clamp to 5V. The signal is sacrificed in this arrangement since the maximum sink capability of the lead in the active low state (approximately 5mA), is usually not sufficient to pull down the active high logic gate. The flag can be retained if the driving gate is open collector logic. Controlling ON/OFF Terminal with a typical CMOS or TTL Logic Gate Reset Pulse on Power-Up (with approximately 300ms delay) RESET/ ENABLE Gnd CS8135 R1 20k Ω R2 100k Ω 4.7 µF CMOS MM 74CO4 or Equivalent Delayed Reset Out CS8135 VIN R1 20k Ω RESET/ ENABLE RESET RESET RESET RESET RESET Function High Current Output VIN VOUT 2 R D 10k Ω C3 + VOUT 2 Circuit Description: continued |
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