Analog Devices LT3999EMSE | Demoboard DC2049A

Description

The DC2049A demonstrates how a power supply regulates two output voltage by using the LT®3999 and low dropout (LDO) regulators.

The LT3999 is a monolithic push-pull DC/DC driver which features a wide input range and small external passive components.

The LT3999 has duty circle control for ΔVIN compensation, which allows for a wide input voltage range and low LDO losses.

The DC2049A employs a push-pull topology that inherently provides a low-noise solution. The design is well suited to noise sensitive systems such as medical instruments, industrial sensing and control, data conversion and wide band communications. The post regulator LDOs reduce output noise further. For more details about the LDOs, please check the LT3065 and LT3090 data sheets.

The DC2049A produces an isolated 12VOUT and –12VOUT at up to 200mA each from a 10V ~ 15.5V input voltage range. This board can be modified, by changing the transformer (and duty cycle), to produce other output voltages.

The DC2049A features a small transformer, small inductors and capacitors that work at a 1MHz switching frequency.

The LT3999 data sheet gives a complete description of the part, operation and applications information. The data sheet must be read in conjunction with this demo manual. The LT3999EMSE is assembled in a 10-lead plastic MSE package with a thermally enhanced ground pad. Proper board layout is essential for maximum thermal performance. See the data sheet section Layout Consideration Check List.

Design files for this circuit board are available athttp://www.linear.com/demo/DC2049A

More information

• Datasheet
• IC product information