All Sections: LT - 9

81. Simple dc/dc converter increases available power in dual-voltage system
    David Kim
    Circuits Linear Technology LT1946
    The schematic in Figure 1 shows a way to increase the power available from a current-limited 5 V supply by adding power from a 5 V supply. The dc/dc converter generates a single 12 V, 150-mA (1.8 W) output from two regulated and current-limited ...
    Jul 12, 2023

82. Broadband random noise generator
    Jim Williams
    Circuits Analog Devices LT1004 LT1006 LT1013 LT1226 LT1228
    Filter, audio, and RF-communications testing often require a random noise source. Figure 1’s circuit provides an RMS-amplitude regulated noise source with selectable bandwidth. RMS output is 300 mV with a 1 kHz to 5 MHz bandwidth, selectable ...
    Jun 27, 2023

83. 3.3V powered V/F converter
    Jim Williams
    Circuits Analog Devices LT1017 LT1034 LTC1043
    Figure 1 is a “charge pump” type V/F converter specifically designed to run from a 3.3 V rail. A 0 V to 2 V input produces a corresponding 0 kHz to 3 kHz output with linearity inside 0.05%. To understand how the circuit works assume ...
    Jun 26, 2023
84. Constant-voltage load box for battery simulation
    Jon Dutra
    Circuits Analog Devices LT1211
    This article describes an active load circuit that can be used to simulate a battery in any state of charge. The battery simulator provides a constant-voltage load for a battery-charging circuit, independent of applied charging current. The ...
    Jun 22, 2023
85. Battery internal resistance meter
    Jim Williams
    Circuits Analog Devices LT1077 LTC1150 LTC1798 LTC6943
    It is often desirable to determine a battery’s internal resistance to evaluate its condition or suitability for an application. Accurate battery resistance determination is complicated by inherent capacitive terms which corrupt results taken ...
    Jun 22, 2023
86. Quasiresonant flyback converter easily charges energy-storage capacitors
    Todor Arsenov
    Circuits STMicroelectronics L6562 L6565
    Designers often use chargers with flyback topologies to quickly charge energy-storage capacitors (references 1 and 2 ). In a flyback topology, the energy transfer takes place only when the charger’s power MOSFET is off, which effectively ...
    Jun 8, 2023
87. Topology implements updated version of non-isolated capacitive power converter
    Zbyno Brudny
    Circuits Linear Technology LTC1046
    .. only a very short time when the charge from C1 has to supply the rest of the circuit. The circuit has been simulated using LT-Spice version 4.19, as well as built and tested (Fig. 3). Figure 3. C1 has to supply the rest of the circuit of ...
    Jun 2, 2023
88. Amplifier compensates piezoelectric-rate gyros
    Jim Mahoney
    Circuits Analog Devices LT1368 LT1495
    Low-power, low-cost ceramic piezoelectric rate gyros are available, but they lack the low-temperature-coefficient characteristics of their quartz counterparts. However, you can use a servo amplifier to remove the dc level shift due to ...
    May 31, 2023
89. Sensing negative outputs
    Dimitry Goder
    Circuits Linear Technology LT1172
    Various switching regulator circuits exist to provide positive- to-negative conversion. Unfortunately, most controllers cannot sense the negative output directly; they require a positive feedback signal derived from the negative output. This ...
    May 29, 2023
90. Automatic load sensing saves power in high voltage converter
    Mitchell Lee
    Circuits
    There are a surprising number of high output voltage applications for LTC’s micropower DC/DC converter family. These applications include electroluminescent panels, specialized sensing tubes and xenon strobes. One of the key features of the ...
    May 16, 2023

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