DC1185B-A

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Introduction

The DC1185B-A is an evaluation board for DC/DC and AC/DC (Off-Line) SMPS. It is an excellent tool for testing and evaluating the performance and operation of a wide variety of switched mode power supplies. It is designed to provide users with a range of easily configurable SMPS configurations. DC1185B-A is used to investigate and experiment in many fields, such as electric automobile, driving, manual user, and users with fast adjustments. It is also an excellent tool for development and validation of switched mode power supplies.

Functionality

The DC1185B-A offers a number of important features. It can provide an output voltage from 2V to 24V at up to 5A, allowing adjustment of the output voltage in very small increments. It also features step up and step down operation for AC to DC, DC to DC and DC to AC conversion, as well as pulse width modulation (PWM) control. In additional to the common functions, the DC1185B-A also has several advanced features such as monitoring of output voltage, current, and power. The accurate peak current limit mode and analog gain setting of the pulse width modulation can serve as good protection to the power supplies and its components.

Applications

The DC1185B-A is widely used in various fields such as office automation, industrial control, mobile communications, medical technology, consumer electronics and home appliances. It enables efficient utilization of resources and energy optimization. The DC1185B-A can be used to develop and validate various kinds of switched mode power supplies in both desktop and mobile applications. It can also be used to evaluate and test the reliability, performance and EMC compliance of power supplies.

Working Principle

The DC1185B-A works in three different switching modes. The first mode, illustrated by the simplified circuit diagram below, is the off-line switching mode, in which the majority of the switching components are connected in parallel with the AC line. The diode bridge rectifies the AC to DC, while the two transistor switches form a basic resonant circuit. The voltage is then applied to the output buffer, and the output is taken from the buffer. The step-down switching mode example shown below uses a buck regulator circuit, which is a boost regulator with a feedback loop. The voltage is divided using resistors RB1 and RA3, and the resulting voltage is compared with the output voltage of the power supply to determine its operation. The feedback loop works to keep the voltage at the desired value.

In the third mode, the forward converter, a diode bridge rectifies the AC to DC. The DC voltage is then applied to the booster transistor; this transistor is set in parallel to the transformer primary winding. The transformer with the secondary winding feeds the current to the rectifier diodes, which convert the alternating current into direct current with the help of the capacitor. The resulting DC voltage is then applied to the output for storage or use.

Conclusion

The DC1185B-A is a versatile and useful tool for quickly evaluating and testing DC/DC and AC/DC (Off-Line) SMPS. The evaluation board offers many features, including adjustability, monitoring, protection, and PWM control, for development and validation of switched mode power supplies. It can be used to develop and validate various kinds of switched mode power supplies in both desktop and mobile applications, and to evaluate and test the reliability, performance and EMC compliance of power supplies. In this article, we discussed the application fields and working principles of the DC1185B-A.

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