VPSC VPS8701

VPS8701 is a transformer driver specifically designed for micro-power isolated power supplies with compact size and low standby power consumption. With only simple input/output filter capacitors, an isolation transformer, and a rectifier circuit as peripheral components, it can realize an isolated power supply with 6.5~30V input voltage, multiple output voltages, and 1~2W output power. The VPS8701 integrates two N-channel power MOSFETs and two P-channel power MOSFETs internally, configured in a bridge topology. An on-chip oscillator provides a pair of high-precision complementary signals, ensuring high symmetry of the two power MOSFET drives and preventing magnetic flux imbalance during operation. The VPS8701 integrates frequency modulation and multiple protection features. Frequency adjustment can be achieved for different application requirements, while a high-precision dead-time control circuit is built in to prevent shoot-through under all operating conditions. Overcurrent detection protection and over-temperature protection are also integrated to prevent device damage under abnormal conditions such as output short circuit.

VPS8701 is a DCDC isolated switching power supply integrated controller suitable for full-bridge topology. The bridge drive topology requires fewer transformer windings and offers lower cost. It supports 6.5V~30V applications with strong compatibility. When the current is excessive, it clamps and limits the power transistor current, ensuring both the chip itself operates within the safe operating area and the peripheral components are protected from high-current stress. The operating frequency can be set via the CLK pin (default frequency when left floating), and a dead time t_BBM is designed between the two drive outputs to prevent shoot-through, reduce the drain-source voltage at power transistor turn-on, and minimize switching losses. The chip can be enabled or disabled via the EN pin. When EN is pulled high (pulled high internally when left floating), the chip operates normally; when EN is pulled low, the chip stops working, achieving ultra-low standby power consumption.

• Full-bridge topology
• High integration, minimal external components
• Integrated 30V / 0.25Ω NMOS
• Integrated 30V / 0.60Ω PMOS
• 0.45A current clamp limit
• 6.5 - 30V input voltage range
• Input surge voltage up to 38V
• Programmable switching frequency
• Sustained short-circuit protection, over-temperature protection, auto-recovery
• Operating temperature range: -40°C ~ +125°C

• 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
• IGBT gate drive power supply