The VP3481 is a versatile controller designed for use in Boost, SEPIC and power converter and to- pologies that needs an external low-side N- MOSFET acting as primary switch. Besides cycle- by-cycle current limiting, current mode control scheme also makes it wide bandwidth and good transient response. The current limit can be pro- grammed simply with an external resistor.
The switching frequency can be set in any value between 100kHz and 1MHz with a resistor or any external clock source. The VP3481 can be operat- ed at high switching frequency to save the solu- tion board size. While entering shutdown mode, the VP3481 only sinks 5μA and it allows power supply sequencing. It has built-in protection cir- cuits such as thermal shutdown, under-voltage lockout, short circuit protection, and overvoltage protection. Internal soft-start circuitry reduces the inrush current at start-up.
VP3481 is available in small MSOP-10 green package.
Features
- Wide Input Voltage from 2.97V to 40V
- Reference Voltage with ±1.5% Accuracy
- Adjustable 100kHz~1MHz Clock Frequency
- 10μA Shutdown Current
- 1A Peak Current Limit Using Internal Driver
- Current Mode Operation
- Internal 4/2? MOSFET Switch
- External RC Compensation
- Internal Soft-Start
- High Efficiency at Light Loads
- Current Limit and Over Temperature Protec- tion
- Adjustable Input UVLO Threshold Voltage
- MSOP-10 Green Package with RoHS Com- pliant
Applications
- Portable Speakers
- Offline Power Supply
- Battery Powered Device
- Set-Top Box
Photovoltaic Inverters
Typical Application
