●The SN6505 is a low-noise, low-EMI push-pull transformer driver, specifically designed for small form factor, isolated power supplies. It drives low-profile, center-tapped transformers from a 2.25 V to 5 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 SN6505 consists of an oscillator followed by a gate drive circuit that provides the complementary output signals to drive ground-referenced 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. SN6505 includes a soft-start feature that prevents high inrush current during power up with large load capacitors. The SN6505 is available in a small 6-pin SOT23/DBV package. The device operation is characterized for a temperature range from –55°C to 125°C.
● Push-Pull Driver for transformers
● Wide Input Voltage Range: 2.25 V to 5.5 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 (SN6505A) and 420 kHz (SN6505B)
● Synchronization of Multiple Devices with External Clock 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
