Fairchild RC5042, RC5040 specifications Device Description, Iload =13.9A

Page 22

AN42

 

 

 

APPLICATION NOTE

 

 

 

 

 

Component Case Temperature

 

 

 

 

 

 

 

 

 

 

Case Temperature

Case Temperature

Case Temperature

 

 

(°C)

(°C)

(°C)

Device

Description

Iload= 9.9A

Iload= 12.4A

Iload =13.9A

Q3A

MOSFET

57

63

56.3

 

K1388

 

 

 

 

 

 

 

 

Q3B

MOSFET

58

64

66.6

 

K1388

 

 

 

 

 

 

 

 

L1

Inductor,

53

56

61.2

 

Unknown

 

 

 

 

 

 

 

 

Q2

Schottky Diode

66

70

87

 

2048CT

 

 

 

 

 

 

 

 

IC

Raytheon RC5040

52

54

58

 

 

 

 

 

Cin

Input Capacitor 1000F

38.2

36.8

39

 

 

 

 

 

Cout

Output Capacitor

35

34.8

38.2

 

1500F

 

 

 

 

 

 

 

 

Note:

Case temperatures are all within guidelines. Our guideline is that case temperatures for all components should be below 105°C @25°C Ambient.

Comments:

Excellent input ripple voltage. Input ripple voltage is recommended to be less than 5% of the output voltage.

Evaluation Summary:

The on-board DC-DC converter is fully functional. It has excellent load regulation, transient response, and input voltage ripple.

Attachment A

Attachment B

22

Image 22
Contents Input Voltages Pentium Pro DC Power RequirementsIntroduction DC Voltage RegulationProcessor Voltage Identification Output Ripple and NoiseEfficiency ControlsSimple Step-Down Converter RC5040 and RC5042 DescriptionRC5040 and RC5042 Controllers Upgrade Present UP# Power Good PwrgdOutput Enable Outen Main Control LoopShort Circuit Protection Design Considerations and Component SelectionOver-Voltage Protection OscillatorRC5042 Thermal Mosfet SelectionTwo MOSFETs in Parallel Conditions1 Manufacturer & Model # Typ MaxCharge Pump or Bootstrap Mosfet Gate BiasConverter Efficiency Implementing Short Circuit Protection Selecting the InductorShort Circuit Comparator Resistor IRC Discrete MetalDescription ResistorResistor mΩ = 2000miFor each Mosfet RC5040 and RC5042 Short Circuit Current Characteristics⋅ .2 = 0.74W Schottky Diode Selection Input filter Schottky Diode Selection TableOutput Filter Capacitors Bill of MaterialsMotorola Shottky Diode PCB Layout Guidelines and ConsiderationsPCB Layout Guidelines 320-6110Example of Proper MOSFETs Placements PC Motherboard Layout and Gerber FileApplication Note Guidelines for Debugging and Performance Evaluations TroubleshootingDebugging Your First Design Implementation Performance Evaluation Vout+ 80.0mV Device Description Iload =13.9ASummary RC5040/RC5042 Evaluation BoardAppendix a Directory of Component Suppliers Life Support Policy

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.