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2.5), so the diode does not conduct and the input and output circuits are effectively isolated from each other. the potential is higher on the right than on the left in Fig. Recalling that the aim is to produce an output voltage greater than the input, it should be clear that the voltage across the diode (D) is negative (i.e. 2.5A, the input current is drawn to appear larger than the output (motor) current, for reasons that will soon become apparent.
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Meanwhile, the motor current is supplied by the storage capacitor (C), the voltage of which falls only a little during this discharge period. 2.5A), the input voltage (V in) is applied across the inductor (L), causing the current in the inductor to rise linearly, thereby increasing the energy stored in its magnetic field. The transistor is switched ON in (A) and OFF in (B).Īs is usual, the converter operates repetitively at a rate determined by the frequency of switching ON and OFF the transistor (T). The combination of small circuit size, low quiescent current and 40V input makes the LT3470 ideal for automotive and industrial applications.įig. Hysteretic current mode control and single-cycle bursts result in very low output ripple and stable operation with small ceramic capacitors. Micropower bias current and Burst Mode operation enable it to consume merely 26μA with no load and a 12V input. The LT3470 accepts an input voltage from 4V to 40V and delivers up to 200mA to load.
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The boosted NPN power stage provides high voltage capability, high power density and high switching speed without the cost and space of external diodes.
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The LT3470 is a 40V step-down converter with the power switch, catch diode and boost diode integrated in a tiny ThinSOT package. In most cases, the switch is an n-type transistor (NMOS or NPN) with a boot-strapped drive stage, requiring an external boost diode and capacitor as well as the main catch diode, complicating the applications circuit. High voltage monolithic step-down converters simplify circuit design and save space by integrating the high side power switch into the device. Keith Szolusha, in Analog Circuit Design, Volume Three, 2015 Introduction The LT1766 is provided in a small 16-pin SSOP (GN16) package with fused corner pins to improve thermal performance. A shutdown pin provides an accurate 2.38V undervoltage lockout threshold in addition to a 0.4V threshold for micropower shutdown (25μA). Running at a fixed frequency of 200kHz, the LT1766 can be externally synchronized to clock frequencies up to 700kHyz. These systems must survive load-dump input transients as high as 60V. The 5.5V to 60V input voltage range makes the LT1766 ideal for 48V nonisolated telecom applications as well as 12V, 24V and (future) 42V automotive applications. The LT1766 is a 1.5A monolithic buck switching regulator. In addition, the current mode topology used to provide fast transient response and good loop stability does not suffer from peak switch current fall off at low input-to-output voltage differentials, commonplace in most current mode converters. The LT1766 is designed to optimize efficiency for both high and low input-to-output voltage differentials to support a wide input voltage range. The switch drop can also limit maximum duty cycle-putting a limit on the minimum input voltage for a given regulated output voltage. Such converters sacrifice efficiency when lower input-to-output voltage differentials are required. At such low duty cycle operation where DC switch losses are less critical, the switch design is often neglected, resulting in a switch resistance that (for some 1.5A converters) can be as poor as 1Ω. Monolithic step-down converters capable of operation at high input voltages are usually optimized for efficiency at high input-to-output voltage differentials. Marosek, in Analog Circuit Design, Volume Three, 2015 Introduction