Backward BT3756 | Demoboard BTDBA11A

Description

The BT3756 is a wide input voltage range, low component count,High efficiency DC/DC controller.Demonstration circuit A11A is a liter developed based on BT3756 Compression DC/DC switching power supply circuit. The functionality of this demo board is Boost the input voltage of 5V~18V to 24V, the output current Up to 1A. By changing the resistance value of the external resistor, the switching frequency can be adjusted The frequency can be set between 200kHz and 800kHz. This application uses 400kHz frequency.The chip pin FB is the input of the external feedback resistor, and its reference The voltage is 1.21V, FB is connected to the output VOUT through the resistor R5, Therefore by calculating the resistance ratio of R6 and R5 to determine the outputVoltage.The BT3756 uses current mode control, which ensures that the converter is Stability within normal operating range. Demonstration circuit on the A11A,select the current-sense resistor according to the peak value IL(PEAK) of the inductor current The size of the resistance. Set the sense voltage at IL(PEAK) to SENSE The minimum value of the current limit threshold, and keep 30% of the Margin.With a built-in linear regulator, the BT3756 can drive an external NMOS power switch to 5V gate voltage. It integrates the soft Start-up and over-temperature protection functions. When the chip is turned off, turn off the power flow below 3µA.

Typical applications