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profil-zyak-2012
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Trier
General Description The MAX2605–MAX2609 are compact high performance intermediate frequency IF voltage controlled oscillators VCOs designed specifically for demanding portable wireless communication systems They combine monolith ic construction with low noise low power operation in a tiny pin SOT23 package These low noise VCOs feature an on chip varactor and feedback capacitors that eliminate the need for external tuning elements making the MAX2605–MAX2609 ideal for portable systems Only an external inductor is required to set the oscillation frequency In addition an integrated differential output buffer is provided for dri ving a mixer or prescaler The buffer output is capable of supplying up to 8dBm differential with a simple power match It also provides isolation from load impedance variations The MAX2605–MAX2609 operate from a single 7V to 5V supply and offer low current consumption These IF oscillators can cover the 45MHz to 650MHz frequency range icon
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General Description The MAX2605–MAX2609 are compact high performance intermediate frequency IF voltage controlled oscillators VCOs designed specifically for demanding portable wireless communication systems They combine monolith ic construction with low noise low power operation in a tiny pin SOT23 package These low noise VCOs feature an on chip varactor and feedback capacitors that eliminate the need for external tuning elements making the MAX2605–MAX2609 ideal for portable systems Only an external inductor is required to set the oscillation frequency In addition an integrated differential output buffer is provided for dri ving a mixer or prescaler The buffer output is capable of supplying up to 8dBm differential with a simple power match It also provides isolation from load impedance variations The MAX2605–MAX2609 operate from a single 7V to 5V supply and offer low current consumption These IF oscillators can cover the 45MHz to 650MHz frequency range

Fe Campillo
The MC34261 MC33261 are active power factor controllers specifically designed for use as a preconverter in electronic ballast and in off–line power converter applications These integrated circuits feature an internal startup timer a one quadrant multiplier for near unity power factor zero current detector to ensure critical conduction operation high gain error amplifier trimmed internal bandgap reference current sensing comparator and a totem pole output ideally suited for driving a power MOSFET icon
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The MC34261 MC33261 are active power factor controllers specifically designed for use as a preconverter in electronic ballast and in off–line power converter applications These integrated circuits feature an internal startup timer a one quadrant multiplier for near unity power factor zero current detector to ensure critical conduction operation high gain error amplifier trimmed internal bandgap reference current sensing comparator and a totem pole output ideally suited for driving a power MOSFET

Amanda
General Description The MAX4373 MAX4374 MAX4375 low cost micropow er high side current sense supervisors contain a high side current sense amplifier bandgap reference and comparator with latching output They feature a voltage output that eliminates the need for gain setting resistors making them ideal for today s notebook computers cell phones and other systems where battery DC current monitoring is critical High side current monitoring is especially useful in battery powered systems since it does not interfere with the ground path of the battery charger The to +28V input common mode range is independent of the supply voltage which ensures that the current sense feedback remains viable even when connected to a battery pack in deep discharge The comparator output of the MAX4373 MAX4374 MAX4375 is latched to provide a turn off flag that doesn t oscillate In addition the MAX4374 MAX4375 contain a second comparator for use in window detec tion functions The MAX4373 MAX4374 MAX4375 are available in three different gain versions T +20V V F +50V V H +100V V and use an external sense resistor to set the sensitivity of the input voltage to the load current These features offer a high level of inte gration resulting in a simple and compact current sense solution The MAX4373 MAX4374 MAX4375 operate from a sin gle 7V to +28V supply and consume A They are specified for the extended operating temperature range 40°C to +85°C and are available in pin and pin MAX packages icon
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General Description The MAX4373 MAX4374 MAX4375 low cost micropow er high side current sense supervisors contain a high side current sense amplifier bandgap reference and comparator with latching output They feature a voltage output that eliminates the need for gain setting resistors making them ideal for today's notebook computers cell phones and other systems where battery DC current monitoring is critical High side current monitoring is especially useful in battery powered systems since it does not interfere with the ground path of the battery charger The to +28V input common mode range is independent of the supply voltage which ensures that the current sense feedback remains viable even when connected to a battery pack in deep discharge The comparator output of the MAX4373 MAX4374 MAX4375 is latched to provide a turn off flag that doesn't oscillate In addition the MAX4374 MAX4375 contain a second comparator for use in window detec tion functions The MAX4373 MAX4374 MAX4375 are available in three different gain versions T +20V V F +50V V H +100V V and use an external sense resistor to set the sensitivity of the input voltage to the load current These features offer a high level of inte gration resulting in a simple and compact current sense solution The MAX4373 MAX4374 MAX4375 operate from a sin gle 7V to +28V supply and consume A They are specified for the extended operating temperature range 40°C to +85°C and are available in pin and pin MAX packages

Maria
INTRODUCTION An induction motor can run only at its rated speed when it is connected directly to the main supply However many applications need variable speed operations This is felt the most in applications where input power is directly proportional to the cube of motor speed In applications like the induction motor based centrifugal pump a speed reduction of results in an energy savings of approximately Driving and controlling the induction motor efficiently are prime concerns in today s energy conscious world With the advancement in the semiconductor fabrication technology both the size and the price of semiconduc tors have gone down drastically This means that the motor user can replace an energy inefficient mechani cal motor drive and control system with a Variable Frequency Drive VFD The VFD not only controls the motor speed but can improve the motor s dynamic and steady state characteristics as well In addition the VFD can reduce the system s average energy consumption Although various induction motor control techniques are in practice today the most popular control tech nique is by generating variable frequency supply which has constant voltage to frequency ratio This technique is popularly known as VF control Generally used for open loop systems VF control caters to a large num ber of applications where the basic need is to vary the motor speed and control the motor efficiently It is also simple to implement and cost effective The PIC16F7X7 series of microcontrollers have three on chip hardware PWM modules making them suitable for phase motor control applications This application note explains how these microcontrollers icon
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INTRODUCTION An induction motor can run only at its rated speed when it is connected directly to the main supply However many applications need variable speed operations This is felt the most in applications where input power is directly proportional to the cube of motor speed In applications like the induction motor based centrifugal pump a speed reduction of results in an energy savings of approximately Driving and controlling the induction motor efficiently are prime concerns in today's energy conscious world With the advancement in the semiconductor fabrication technology both the size and the price of semiconduc tors have gone down drastically This means that the motor user can replace an energy inefficient mechani cal motor drive and control system with a Variable Frequency Drive VFD The VFD not only controls the motor speed but can improve the motor's dynamic and steady state characteristics as well In addition the VFD can reduce the system's average energy consumption Although various induction motor control techniques are in practice today the most popular control tech nique is by generating variable frequency supply which has constant voltage to frequency ratio This technique is popularly known as VF control Generally used for open loop systems VF control caters to a large num ber of applications where the basic need is to vary the motor speed and control the motor efficiently It is also simple to implement and cost effective The PIC16F7X7 series of microcontrollers have three on chip hardware PWM modules making them suitable for phase motor control applications This application note explains how these microcontrollers

Microchip Technology
General Description The MAX6668 MAX6670 remote junction thermal switches with an internal power transistor drive a cool ing fan rated for supply voltages up to +12V and 250mA These devices measure the temperature of an external P N junction typically a diode connected tran sistor and turn on the fan power switch when the remote temperature rises above a factory programmed threshold Self contained and requiring no software development the MAX6668 MAX6670 are simple “drop in” fan control solutions for a variety of systems The MAX6670 features an open drain WARN output that goes active when the remote temperature exceeds the factory programmed fan activation threshold by +15°C The MAX6670 features an open drain OT output that goes active when the remote temperature exceeds the factory programmed threshold by +30°C The MAX6668 MAX6670 provide a fan control input FORCEON that allows the fan to be driven externally regardless of temperature Available temperature thresholds range from +40°C to +75°C in 5°C increments Hysteresis is preset to 8°C on the MAX6668 or pin selectable to 4°C 8°C or 12°C using a three level logic input on the MAX6670 Temperature threshold accuracy is ±1°C typ and 2°C max for remote junction temperatures from +40°C to +75°C The MAX6668 MAX6670 operate from a +3V to 6V power supply and are specified over the automotive temperature range 40°C to +125°C The MAX6668 is offered in an pin MAX package and the MAX6670 is available in a space saving pin MAX package icon
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General Description The MAX6668 MAX6670 remote junction thermal switches with an internal power transistor drive a cool ing fan rated for supply voltages up to +12V and 250mA These devices measure the temperature of an external P N junction typically a diode connected tran sistor and turn on the fan power switch when the remote temperature rises above a factory programmed threshold Self contained and requiring no software development the MAX6668 MAX6670 are simple “drop in” fan control solutions for a variety of systems The MAX6670 features an open drain WARN output that goes active when the remote temperature exceeds the factory programmed fan activation threshold by +15°C The MAX6670 features an open drain OT output that goes active when the remote temperature exceeds the factory programmed threshold by +30°C The MAX6668 MAX6670 provide a fan control input FORCEON that allows the fan to be driven externally regardless of temperature Available temperature thresholds range from +40°C to +75°C in 5°C increments Hysteresis is preset to 8°C on the MAX6668 or pin selectable to 4°C 8°C or 12°C using a three level logic input on the MAX6670 Temperature threshold accuracy is ±1°C typ and 2°C max for remote junction temperatures from +40°C to +75°C The MAX6668 MAX6670 operate from a +3V to 6V power supply and are specified over the automotive temperature range 40°C to +125°C The MAX6668 is offered in an pin MAX package and the MAX6670 is available in a space saving pin MAX package

Fe Campillo
General Description The MAX220–MAX249 family of line drivers receivers is intended for all EIA TIA 232E and V V communica tions interfaces particularly applications where ±12V is not available These parts are especially useful in battery powered sys tems since their low power shutdown mode reduces power dissipation to less than W The MAX225 MAX233 MAX235 and MAX245 MAX246 MAX247 use no external components and are recommended for appli cations where printed circuit board space is critical icon
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General Description The MAX220–MAX249 family of line drivers receivers is intended for all EIA TIA 232E and V V communica tions interfaces particularly applications where ±12V is not available These parts are especially useful in battery powered sys tems since their low power shutdown mode reduces power dissipation to less than W The MAX225 MAX233 MAX235 and MAX245 MAX246 MAX247 use no external components and are recommended for appli cations where printed circuit board space is critical

Line Detection