VPS6501

VPS6501 is an isolated DCDC switching power supply integrated controller for push-pull topology, featuring a built-in pair of 0.3Ω nLDMOS power transistors, supporting applications with supply voltages ranging from 2.8V to 6V at various power levels. When current exceeds the limit, a clamp restricts the power transistor current, ensuring the chip operates within its safe operating area while protecting peripheral components from high-current stress. The operating frequency of VPS6501 is internally set, and a dead-band time t_BBM is designed between the two drive signals to prevent shoot-through and reduce the drain-source voltage during power transistor turn-on, thereby minimizing switching losses. VPS6501 is a push-pull transformer driver specifically designed for compact, low standby power, micro-power isolated supplies. With only simple input/output filter capacitors, an isolation transformer, and a rectifier circuit as peripheral components, it can implement an isolated power supply with 3.3V or 5V input, 3.3V~24V output, and 1~2W output power. The VPS6501 integrates an internal oscillator that provides a pair of high-accuracy complementary signals to drive two N-channel MOSFETs. The internal circuitry is designed with a symmetrical architecture to ensure a high degree of symmetry between the two power MOSFETs, preventing magnetic flux imbalance during operation. A high-accuracy dead-time control circuit is integrated internally to ensure shoot-through does not occur under all operating conditions.

Applications

• Low-power isolated power supply for CAN/RS-485/RS-232/SPI/I2C
• Process control
• Precision instruments/Medical instruments
• Distributed power/Radio power/Telecom power
• Low-noise isolated USB power supply/Low-noise filament power supply

Key features

• Push-pull topology
• High integration, minimal external components
• Built-in 24V / 0.3Ω LDMOS 0.8A current clamp limiting
• 2.8 - 6V input voltage range
• Input surge voltage 10V
• Continuous short-circuit protection, over-temperature protection, auto-recovery
• Operating temperature range: -40°C ~ +125°C