Texas Instruments SN6505x/SN6505x-Q1 Low-Noise Transformer Drivers are low-noise, low-EMI push-pull transformer drivers. They specifically are designed for small form factor, isolated power supplies. Each device can drive a low-profile, center-tapped transformer from a 2.25V to 5V 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 SN6505x/SN6505x-Q1 consists of an oscillator followed by a gate drive circuit. This provides the complementary output signals to drive ground-referenced N-channel power switches. The device includes two 1A 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 SN6505x-Q1 devices are AEC-Q100 qualified for automotive applications.
Features
Push-pull driver for transformers
2.25V to 5.5V Wide input voltage range
1A at 5V Supply high output drive
Low RON 0.25Ω Max at 4.5V supply
Ultra-low EMI
Spread spectrum clocking
Precision internal oscillator options of 160kHz (SN6505A) and 420kHz (SN6505B and SN6505D)
Synchronization of multiple devices with external clock input
Slew-rate control
1.7A Current-limit
<1µA Low shutdown current
Thermal shutdown
-55°C to 125°C Wide temperature range
Small 6-Pin SOT23
Soft start to reduce in-rush current
Applications
Isolated power supply for CAN, RS-485, RS-422, RS-232, SPI, I2C, low-power LAN
