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CS9202 Datasheet(PDF) 4 Page - ON Semiconductor |
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CS9202 Datasheet(HTML) 4 Page - ON Semiconductor |
4 / 6 page CS9202 http://onsemi.com 4 CIRCUIT DESCRIPTION VOLTAGE REFERENCE AND OUTPUT CIRCUITRY Output Stage Protection The output stage is protected against overvoltage, short circuit and thermal runaway conditions (Figure 8). If the input voltage rises above 32 V (typ), 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 Load Dump Short Circuit Thermal Shutdown VIN VOUT IOUT > 32 V GND VIN VOUT CS9202 C1* 0.1 mF * C1 is required if regulator is distant from power source filter. Figure 9. Application and Test Diagram APPLICATION NOTES STABILITY CONSIDERATIONS / NOCAP Normally a linear regulator (with a slow lateral PNP in the control loop) necessitates a large external compensation capacitor at the output of the IC. The external capacitor is also used to curtail offshoot, determine startup delay time and load transient response. Traditional regulators typically have low unity gain bandwidth, display overshoot and poor ripple rejection. Compensation is also an issue and depends on the external capacitor value, ESR (Equivalent Series Resistance) and board layout parasitics that all can create oscillations if not properly accounted for. NOCAP is an ON Semiconductor exclusive output stage which internally compensates the regulator over temperature, load and line variations without the need for an expensive external capacitor. NOCAP is ideally suited for slow switching or steady loads. If the load is characterized by transient current events, an output storage capacitor may be needed. If this is the case, the capacitor should be no larger than 100 nF. With loads that require greater transient suppression, a regulator with a traditional output stage (such as the CS8221) may be better suited for proper operation. |
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