All Sections: LT - 7

61. High Voltage CMOS Amplifier Enables High Impedance Sensing with a Single IC
    Jon Munson
    Circuits Linear Technology LTC6090 LT5400 LT6654 LT8300 CMHZ4697
    Introduction Accurately measuring voltages requires minimizing the impact of the instrument connection to the tested circuit. Typical digital voltmeters (DVMs) use 10 M resistor networks to keep loading effects to an inconspicuous level, but even ...
    Oct 10, 2016

62. 60V Buck-Boost LED Driver with Up to 98% Efficiency Has Internal PWM Dimming and Spread Spectrum
    Keith Szolusha
    Circuits Linear Technology LT8391
    Design Note 548 Synchronous buck-boost converters with four power switches can deliver very high efficiency while providing both step-up and step-down DC/DC conversion. Combining the capabilities of two separate converters (buck and boost) has the ...
    Oct 18, 2016

63. Active load handles high voltages
    Circuits Linear Technology LT1243
    Gheorghe Plasoianu EDN Bench electronic loads are usually rated for voltages less than 100 V, which make it difficult to test high-voltage power supplies. This Design Idea offers an alternative: an inexpensive electronic load rated for 500 V or ...
    Oct 24, 2016
64. Thermal design: Get the heat out of the electronics
    Paul Rako
    Articles Linear Technology LT3080
    If you have high-powered LEDS, or a power supply, or are trying to control larger motors, you have to get a lot of heat out of your circuit boards. The classic way to dissipate heat is to bolt your power transistor to an aluminum heat sink. That is ...
    Mar 11, 2017
65. Current Limiter Offers Circuit Protection with Low Voltage Drop
    Sajjad Haidar
    Circuits Linear Technology LT1636
    Most common current-limiting implementations have a voltage drop that’s too high for today's systems with their low-voltage supply rails; this design with its far lower voltage drop is a better fit. There are many cases where a power ...
    Nov 18, 2016
66. Convert 1 to 5V signal to 4- to 20-mA output
    Thomas Mosteller
    Circuits Linear Technology LT5400
    Despite the long-predicted demise of the 4- to 20-mA current loop, this analog interface is still the most common method of connecting current-loop sources to a sensing circuit. This interface requires the conversion of a voltage signal typically, ...
    Dec 1, 2016
67. Using a Current Sharing Controller with Non-Redundant Supplies
    Circuits Linear Technology LT1716 LT6650 LTC4370
    Bob Smith, Linear Technology Design Note 1036 Introduction The LTC®4370 is a 2-supply current sharing, diode- ORing controller that uses MOSFETs to form ideal diodes. In this way, the LTC4370 can actively balance the output currents of two ...
    Dec 2, 2016
68. Single Transistor Provides Short-Circuit Protection
    Keith Szolusha
    Circuits Linear Technology LT1961
    In certain dc/dc-converter applications, on-chip, cycle-by-cycle current limit may be insufficient protection to prevent a failure during a short circuit. A nonsynchronous boost converter provides a direct path from the input to the short circuit ...
    Dec 14, 2016
69. Op Amps Make Precision Clipper, Protect ADC
    Aaron Schultz Thomas Mosteller
    Articles Linear Technology LT6015 LT6016 LT6017
    A simple op amp clipping circuit can limit input-voltage excursions into an ADC, thus preventing input overload and possible damage to the converter. It can be a challenge to match the voltage range of an analog signal to the input range of an ...
    Jan 6, 2017
70. 1-Hz to 100-MHz VFC features 160-dB dynamic range
    Jim Williams
    Circuits Linear Technology LT1460 LTC1150 LTC6943
    The VFC (voltage-to-frequency-converter) circuit in Figure 1 achieves a wider dynamic range and a higher full-scale output frequency 100 MHz with 10% overrange to 110 MHz by a factor of 10 over any commercially available converter. The ...
    Jan 19, 2017

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