Function and principle
overview
VPS8702/S is a DCDC isolated switching power supply integrated controller suitable for full bridge topology. The bridge drive mode has less transformer windings and low cost. satisfy
3V~6V application, strong compatibility. When the current is too large, the clamp limits the current of the power tube, which not only ensures that the chip itself works in a safe area, but also protects the peripheral devices from the impact of high current. it
The dead time tBBM is designed between the two drivers, which not only avoids the common phenomenon, but also reduces the drain-source voltage when the power tube is turned on, reducing the switching loss.
The ON or OFF of the chip can be controlled through the EN pin. When EN is pulled to a high potential (it is pulled to a high potential by itself when it is suspended), the chip operates normally; EN is pulled to a low potential
, the chip stops working to achieve ultra-low standby power consumption.
1 Features
Full bridge topology
High integration, simple peripheral
Built-in 0.13Ω NMOS
Built-in 0.25Ω PMOS
0.8A Current Clamp Limit
3-6V input voltage range
Input surge voltage up to 10V
Input overvoltage protection
Sustainable short-circuit protection, over-temperature protection, self-recovery
Chip working temperature -40℃~+125℃
2 Fields of application
CAN\RS-485\RS-232\SPI\I2C and other low-power isolated power supplies
Process control
Precision instruments\Medical instruments
Distributed power supply\radio power supply\telecom power supply
Low noise isolated USB power supply
Low noise filament power supply
IGBT gate drive power supply
3 Description
VPS8702/S is a small size, low standby power consumption
Transformer driver designed for micro-power isolated power supply, its peripheral only needs to match
Equipped with simple input and output filter capacitors, isolation transformers and rectifier circuits,
It can realize 3~6V input voltage, multiple output voltages and high output power
Isolated power up to 3W.
VPS8702/S integrates two N-channel power MOSFETs and
Two P-channel power MOSFETs, and form a bridge connection. chip
The internal integrated oscillator provides a pair of high-precision complementary signals, which can effectively ensure
The high symmetry of the drive of the two power MOSFETs avoids the circuit
Magnetic bias occurs during the operation.
VPS8702/S integrates multiple protection methods inside. Internally designed with
The high-precision dead zone control circuit ensures that no
Common phenomenon; integrated over-current detection protection and over-temperature protection to avoid
The device will be damaged under abnormal conditions such as short circuit of power supply output.
Model package: VPS8702 SOT23-6
Model package: VPS8702S ESOP-8
More plans welcome to consult