Fairchild RC5040, RC5042 Guidelines for Debugging and Performance Evaluations, Troubleshooting

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APPLICATION NOTE

AN42

 

 

Guidelines for Debugging and Performance Evaluations

Debugging Your First Design Implementation

Use the following procedure to help you debug your design implementation:

1.Note the VID pins settings. They tell you what voltage is to be expected.

2.Do not connect any load to the circuit. While monitoring the output voltage, apply power to the part with current limiting at the power supply. Do this to make sure that no catastrophic shorts occur.

3.Ιf proper voltage is not achieved, follow the procedures in the Troubleshooting section.

4.After there is proper voltage, increase the current limit- ing of the power supply to 16A.

5.Apply load at 1A increments; an active load (HP6060B or equivalent) is suggested.

6.In case of poor regulation, refer to the procedures in the Troubleshooting section.

Troubleshooting

1.If no voltage is registered at the output and the circuit is not drawing current, look for openings in the connec- tions. Check the circuitry versus the schematic, and the power supply pins at the device to ascertain that volt- age(s) had been applied.

2.If no voltage is registered at the output and the circuit is drawing excessive current (>100mA) with no load, check for possible shorts. Trace the path of the excessive current to determine if the controller is at fault or if the excessive current is due to peripheral components.

3.If the output voltage comes near to, but is not, what is expected, check the VID inputs at the device pins. The part is factory set to correspond to the VID inputs.

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Contents DC Voltage Regulation Pentium Pro DC Power RequirementsIntroduction Input VoltagesControls Output Ripple and NoiseEfficiency Processor Voltage IdentificationSimple Step-Down Converter RC5040 and RC5042 DescriptionRC5040 and RC5042 Controllers Main Control Loop Power Good PwrgdOutput Enable Outen Upgrade Present UP#Oscillator Design Considerations and Component SelectionOver-Voltage Protection Short Circuit ProtectionRC5042 Conditions1 Manufacturer & Model # Typ Max Mosfet SelectionTwo MOSFETs in Parallel ThermalMosfet Gate Bias Charge Pump or BootstrapConverter Efficiency Implementing Short Circuit Protection Selecting the InductorShort Circuit Comparator Resistor Discrete MetalDescription Resistor IRC= 2000mi Resistor mΩFor each Mosfet RC5040 and RC5042 Short Circuit Current Characteristics⋅ .2 = 0.74W Schottky Diode Selection Bill of Materials Schottky Diode Selection TableOutput Filter Capacitors Input filter320-6110 PCB Layout Guidelines and ConsiderationsPCB Layout Guidelines Motorola Shottky DiodePC Motherboard Layout and Gerber File Example of Proper MOSFETs PlacementsApplication Note Guidelines for Debugging and Performance Evaluations TroubleshootingDebugging Your First Design Implementation Vout Performance Evaluation+ 80.0mV Iload =13.9A Device DescriptionRC5040/RC5042 Evaluation Board SummaryLife Support Policy Appendix a Directory of Component Suppliers

RC5040, RC5042 specifications

The Fairchild RC5042 and RC5040 are versatile integrated circuits that stand out in the realm of high-performance analog applications. Designed to meet the demands of modern electronic systems, these devices integrate various features and technologies that contribute to their effectiveness in a multitude of applications.

The RC5040 is a precision voltage reference that offers a stable, low-noise output, making it ideal for applications such as instrumentation, data acquisition systems, and RF circuits. It boasts an operating temperature range of -40°C to +85°C, ensuring reliability in diverse environments. One of its most significant characteristics is its low-temperature drift, which minimizes variations in output voltage over temperature fluctuations, thereby enhancing the accuracy of devices that utilize it.

On the other hand, the RC5042 is designed as a high-speed comparator with an integrated voltage reference. This dual functionality allows for a more compact design in applications where space is a premium. The RC5042 features an ultra-fast response time and high input impedance, which contribute to its capability to handle rapidly changing signals without distortion. This makes it particularly useful in applications like analog signal processing and threshold detection.

Both devices utilize Fairchild's advanced BiCMOS technology, which combines the benefits of bipolar and CMOS processes. This technology allows the devices to operate with low power consumption while maintaining high speed and operational efficiency. The RC5042 and RC5040 also incorporate noise-reduction techniques, which help in minimizing unwanted disturbances that could impact circuit performance.

Another noteworthy characteristic of both the RC5040 and RC5042 is their ease of integration. They come in compact package sizes, making them easier to incorporate into various designs without compromising on performance. Furthermore, the availability of multiple output options allows engineers the flexibility to choose configurations that best suit their specific applications.

In conclusion, the Fairchild RC5042 and RC5040 are robust devices that offer essential functionality for various high-performance analog applications. With their precision, fast response time, and exceptional reliability, these integrated circuits are a valuable asset in the design of modern electronic systems, catering to the growing demands of the technology landscape.
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