SNDBS400B18

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DC to DC converters are widely used in various applications, ranging from automotive to mobile devices. The SNDBS400B18 is a high-efficiency DC to DC converter which offers an 18V output voltage and 1A output current while having a wide input voltage range from 4.5V to 24V. It is a non-isolated flyback topology DC-DC converter with high power efficiency, low cost, long life, and small size.

The SNDBS400B18 has been designed to meet the requirements ofmany applications, such as industrial system DC/DC converters, motor control systems, computer system peripheral supplies, and LCD monitor supplies. It is rated at 400 W with a wide operating temperature range from -40°C to +85°C.

The working principle of the SNDBS400B18 is pretty simple. Its core component is the primary side MOSFET. When the energy is stored in the primary circuit, the current flows into the diode first, and then enters the primary side MOSFET. When the voltage reaches the breakdown value of the MOSFET, the MOSFET is turned on and the energy stored in the primary circuit is transferred to the feedback winding on the secondary side. At the same time, a current flows into the feedback winding and forms a closed loop, so that the output voltage quickly reaches the rated voltage.

The output voltage of the SNDBS400B18 is controlled by the turns ratio of the primary and secondary windings. The feedback winding is connected to the feedback pin, and the voltage of the feedback pin is compared with a fixed voltage of the internal voltage comparator. When the voltage of the feedback pin is higher than the internal voltage, the PWM signal sent to the MOSFET will be shut off and the output voltage will be locked. On the other hand, if the voltage of the feedback pin is lower than the internal voltage, the PWM signal will be turned on again and the output voltage will reach its rated voltage again.

The SNDBS400B18 has wide input voltage range, high output power efficiency, and low power consumption. It is also equipped with a low-noise linear regulator to reduce output ripple voltage and protect the load. It has many beneficial features that make it an ideal choice for a wide range of applications, including industrial system DC/DC converters, motor control systems, computer system peripheral supplies, and LCD monitor supplies.

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