In automotive and heavy equipment environments, power conversion systems must meet extremely demanding requirements. These systems often operate across wide voltage ranges, experience large transients, and face significant temperature variations. Additionally, the growing number of voltage rails in modern electronics—such as 8.5V, 5V, 3.3V, 2.5V, 1.8V, and 1.5V in a typical navigation system—adds complexity to the design. As component counts increase, space becomes more limited, making high-efficiency power conversion essential due to both spatial constraints and thermal challenges.
To address these challenges, automotive and truck DC/DC regulators must support a broad input voltage range. For 12V systems, a 60V rating offers sufficient headroom, typically clamped between 36V and 40V. In dual battery applications, such as those found in trucks and heavy vehicles, where the nominal voltage is 24V, a higher operating voltage is necessary. Most systems are clamped around 58V, so a 60V-rated regulator is usually adequate. Overvoltage clamps are also important to protect against transient voltages caused by engine starter inductive kickback, which can otherwise lead to dangerous voltage spikes.
Many vehicle systems, like remote door locks and alarm systems, require continuous power even when the engine is off. This "always on" operation demands low quiescent current from the DC/DC converter to maximize battery life. The LTC3890, for example, transitions into Burst Mode at light loads (below ~30–50mA), reducing quiescent current to tens of microamps and significantly extending battery run time.
With the limited availability of 60V DC/DC converters, some designers have turned to transformer-based topologies or external high-side drivers, but these approaches often complicate the design and reduce efficiency. Linear Technology’s LTC3890 offers a better solution, supporting 60V inputs with high efficiency and minimal complexity. It is ideal for 12V or 24V automotive, truck, and industrial applications, with outputs up to 20A and efficiencies reaching 98%.
The LTC3890 features a wide input range (4V to 60V) and supports multiple operating modes, including Burst Mode, Pulse Skipping, and Forced Continuous. Its two-phase architecture reduces input filtering needs, while its current mode control ensures fast transient response and easy compensation. The device also includes overcurrent protection, gate drive capabilities, and options for DCR or resistor-based current sensing.
Efficiency remains high across a wide load range, even under light loads, thanks to Burst Mode operation. This makes it especially suitable for always-on systems that need to minimize power consumption. The LTC3890 also delivers excellent transient performance, with a fast amplifier capable of handling high bandwidths and allowing precise control over output voltage fluctuations.
Overall, the LTC3890 is an advanced solution for high-voltage power conversion in challenging environments. Its combination of high input voltage capability, low quiescent current, and flexible operation modes makes it a reliable choice for automotive, truck, and heavy equipment applications. Whether used in dual battery systems or compact designs, the LTC3890 provides a cost-effective, efficient, and robust power management solution.
433MHZ Antenna
With the rapid development of wireless sensing technology, 433 MHz wireless communication devices have been more widely used in portable devices, vehicle-mounted terminals, intelligent locks and other fields [1]. As an important part of wireless communication equipment, antenna is a key component that affects the overall performance of the communication system [2].
Domestic and foreign scholars have been exploring the 433 MHz printed antenna with high gain and miniaturization for many years. However, there are two main trends in the design of 433 MHz printed antenna by previous scholars: one is to sacrifice size to ensure high gain, such as the structural scheme in literature [3]; The other is to sacrifice gain to ensure size miniaturization, such as the scheme in reference [4].
Taking into account the effective size and gain characteristics of the antenna is the difficulty in the design of 433 MHz miniaturized printed antenna. Based on the research experience of domestic and foreign scholars on 433 MHz printed antenna, a 433 MHz miniaturized spiral printed antenna is designed based on the 1/4 wavelength monopole antenna. The simulation results show that the antenna occupies only 20×35 mm2 and the effective gain is -4.14 dB.
433MHZ Rubber Antenna,433Mhz Patch antenna,433MHZ antenna with magnetic base,433MHZ Yagi Antenna
Yetnorson Antenna Co., Ltd. , https://www.yetnorson.com
