Issue link: https://resources.mouser.com/i/1437744
As a result, 48V Mild Hybrid vehicles that provide a lower-cost solution while still reducing CO2 emissions attract increased attention. The major difference between Mild Hybrid and standard vehicles is the battery's power-supply voltage. Mild Hybrid systems utilize a 48V battery, quadruple the standard systems' voltage (12V). However, because all other elements remain the same, including ECUs, the input /output voltage difference is significantly increased. In response to these emerging challenges, ROHM innovated new converter technology, Nano Pulse Control ™ , to enable the conversion of high voltages to low voltages used in modern complex integrated circuits in a single stage. By reducingthe switching ON time of the DC/ DC converter to several nanoseconds from a typical ON time of over 100 nanoseconds, Nano Pulse Control ™ devices can offer stable control at extremely narrow pulse widths. One technical hurdle for achieving lower output voltage from a higher input voltage at high frequency is narrowing the switching pulse width. The switching pulse width of a DC/DC converter is a function of the input voltage, output voltage, and switching frequency and is calculated by the following: t_on=V_ OUT /V_ IN ÷f (ton: Switching Pulse Width, V OUT : Output Voltage, V IN : Input Voltage, f: Switching Frequency) Formula 1: Switching Pulse Width Calculation Formula As shown in the equation, the switching pulse width narrows as the input voltage increases, output Figure 2: DC/DC Converter Operating Principle and Circuit (Source: Rohm) In the automotive field, regulatory targets have been established in many countries, prompting manufacturers to develop electric vehicles to achieve these limits. 11 innovations in Converter design Enhances Efficiency in 48V (and Higher) Systems