LINEAR TECHNOLOGY DC1722A Demonstration Board for 55V Low IQ Step-Down DC-DC Converter with 100% Duty Cycle Capability
The is a demonstration circuit for LTC3864EMSE DC to DC converter. The LTC3864EMSE is a robust, high voltage step down DC to DC controller which drives a P channel power MOSFET switch allowing 100% duty cycle operation. The board operates from an input range of 3.5V to 55V and provides a 5V, 2A output when the input exceeds 5V. The PMOSFET architecture allows it to operate seamlessly up to 100% duty cycle and function as a saturated switch below the regulation threshold down to 3.5VIN. It operates at 350KHz and may be synchronized to an external clock. A soft start feature controls output voltage slew rate at start up, reducing current surge and voltage overshoot. Burst mode operation that improves efficiency at light loads can be enabled with a jumper. The demonstration board has options for larger MOSFET and diode packages on the back of the board for higher output current requirements.
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- 84% efficiency
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- Strong high voltage MOSFET gate driver
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- Constant frequency current mode architecture
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- Verified FMEA for adjacent pin open/short
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- Selectable high efficiency burst mode operation or pulse skipping mode at light loads
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- Accurate current limit
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- Programmable soft start or voltage tracking
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- Internal soft start guarantees smooth start up
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- Power good output voltage monitor
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- Low shutdown of 7µA
If there is no output, temporarily disconnect the load to make sure that the load is not set too high.