Fairchild RC5042, RC5040 specifications

Page 6

AN42

 

 

 

 

 

 

 

 

 

 

 

APPLICATION NOTE

 

L2

 

 

 

 

 

 

 

 

 

 

 

 

VCC

2.6H

 

 

 

 

 

 

 

 

 

 

 

 

C4

C1

 

C2

C3

C5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.1F

 

1000F

1000F

1000F

0.1F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DS2

 

C8

C9

 

 

 

 

 

 

 

 

 

 

1N5817

 

 

 

 

 

 

 

 

 

 

 

 

0.1F

0.1F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

M1

 

M2

 

 

 

 

 

 

11

 

10

C12

 

 

2SK1388

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

12

 

 

9

1F

 

 

 

 

 

 

 

R7

 

13

 

 

8

2SK1388

 

L1

RSENSE

 

 

 

 

 

 

 

 

 

 

 

 

 

14

 

 

7

 

 

 

 

 

 

 

VO

10K

 

 

 

 

 

 

1.3H

 

F

F

 

15

 

 

6

C6

 

 

8mΩ

F

 

 

RC5040

4.7F

 

 

 

 

1500

1500

1500

VREF

 

16

 

 

5

 

 

 

 

 

17

 

 

4

M3

 

 

 

 

 

 

 

C7

 

 

 

 

DS1

 

 

 

 

 

18

 

 

3

 

 

 

 

 

 

 

 

 

 

2SK1388

 

 

 

 

C13

C14

C15

 

 

19

 

 

2

 

1N5817

 

0.1F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GND

 

20

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CEXT

 

 

 

 

 

 

 

 

 

 

 

 

39pF

 

 

 

 

 

 

 

 

VID3

R1

 

10K

 

 

 

VCC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VID2

R2

 

10K

 

R6

 

 

 

 

 

 

 

 

 

 

 

10K

 

 

 

 

 

 

 

 

 

R3

 

10K

 

 

 

 

 

 

 

 

VID1

 

 

 

 

PWRGD

 

65-AP42-04

 

 

 

 

 

 

 

 

 

 

 

VID0

R4

 

10K

 

VCC

C11

 

 

 

 

 

 

 

 

 

 

0.22F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OUTEN

 

 

 

 

R5

 

 

 

 

 

 

 

 

 

 

 

10K

 

 

 

 

 

 

 

 

 

 

 

 

C10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.1F

 

 

 

 

 

 

 

 

Figure 4. Synchronous DC-DC Converter Application Schematic Using RC5040

 

L2

 

 

 

 

 

 

 

 

 

 

 

 

VCC

2.6H

 

 

 

 

 

 

 

 

 

 

 

 

C4

C1

C2

C3

C5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.1F

 

1000F

1000F

1000F

0.1F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DS2

C8

 

C9

 

 

 

 

 

 

 

 

 

 

1N5817

 

 

 

 

 

 

 

 

 

 

 

0.1F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.1

F

 

 

 

 

 

 

 

 

 

 

 

 

 

M2

 

 

 

 

 

 

 

 

 

 

C12

M1

 

2SK1388

 

 

 

 

 

 

 

 

 

1F

 

 

 

 

 

 

 

 

 

 

 

 

2SK1388

 

L1

 

 

 

 

 

 

9

 

8

 

 

RSENSE

 

 

 

 

R7

 

 

 

 

 

 

 

 

 

10

 

7

 

 

 

 

 

 

 

 

VO

 

 

 

 

 

 

 

1.3H

 

1500F

 

 

10K

11

 

6

C6

 

 

 

8mΩ

1500F

1500F

 

 

 

 

 

 

 

 

 

VREF

 

12

RC5042

5

4.7F

 

 

 

 

 

 

 

 

 

13

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C7

14

 

3

 

 

DS1

 

 

 

C13

C14

C15

 

 

 

 

 

 

 

 

 

 

0.1F

15

 

2

 

 

MBR1545CT

 

 

GND

 

16

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CEXT

 

 

 

 

 

 

 

 

 

 

 

 

39pF

 

 

 

 

 

 

 

 

 

 

VID3

R1

10K

 

 

VCC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VID2

R2

10K

 

 

R6

 

 

 

 

 

 

 

 

 

 

 

 

10K

 

 

 

 

65-AP42-05

 

 

 

R3

10K

 

 

 

 

 

 

 

 

VID1

 

 

 

PWRGD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VID0

R4

10K

 

VCC

 

C11

 

 

 

 

 

 

 

 

 

C10

 

0.22F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.1F

 

 

 

 

 

 

 

 

 

Figure 5. Non-Synchronous DC-DC Converter Application Schematic Using RC5042

6

Image 6
Contents Input Voltages Pentium Pro DC Power RequirementsIntroduction DC Voltage RegulationProcessor Voltage Identification Output Ripple and NoiseEfficiency ControlsRC5040 and RC5042 Description Simple Step-Down ConverterRC5040 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 Selecting the Inductor Implementing Short Circuit ProtectionShort Circuit Comparator Resistor IRC Discrete MetalDescription ResistorResistor mΩ = 2000miRC5040 and RC5042 Short Circuit Current Characteristics For each Mosfet⋅ .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 Troubleshooting Guidelines for Debugging and Performance EvaluationsDebugging 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.