ZCC6505替代SN6505

1 Features
• Push-Pull Driver for transformers• Wide Input Voltage Range: 2.25 V to 20 V• High Output Drive: 1 A at 5 V Supply• Low RON 0.25 Ω Max at 4.5 V Supply• Ultra-Low EMI• Spread Spectrum Clocking• Precision Internal Oscillator Options: 160 kHz(ZCC6505A) and 500 kHz (ZCC6505B)• Synchronization of Multiple Devices with ExternalClock Input• Slew-Rate Control• 1.7 A Current-Limit• Low Shutdown Current: <1 μA• Thermal Shutdown• Wide Temperature Range: –55°C to 125°C• Small 6-Pin SOT23/DBV Package• Soft Start to reduce In-rush current
2 Applications
• Isolated Power Supply for CAN, RS-485, RS-422,RS-232, SPI, I2C, Low-Power LAN• Low-Noise Isolated USB Supplies• Process Control• Telecom Supplies• Radio Supplies• Medical Instruments• Distributed Supplies• Medical Instruments• Precision Instruments• Low-Noise Filament Supplies


3.Description
The ZCC6505 is a low-noise, low-EMI push-pull transformer driver, specifically designed for small form factor, isolated power supplies. It drives lowprofile, center-tapped transformers from a 2.25 V to 20 V DC power supply. Ultra-low noise and EMI are achieved by slew rate control of the output switch voltage and through Spread Spectrum Clocking (SSC). The ZCC6505 consists of an oscillator followed by a gate drive circuit that provides the complementary output signals to drive groundreferenced N-channel power switches. The device includes two 1-A Power-MOSFET switches to ensure start-up under heavy loads. The switching clock can also be provided externally for accurate placement of switcher harmonics, or when operating with multiple transformer drivers. The internal protection features include a 1.7A current limiting, under-voltage lockout, thermal shutdown, and break-before-make circuitry. ZCC6505 includes a soft-start feature that prevents high inrush current during power up with large load capacitors. The ZCC6505 is available in a small 6pin SOT23/DBV package. The device operation is characterized for a temperature range from –55°C to 125°C.