SN6505ADBVT

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1. Describe

The SN6505ADBVT is a low noise, low EMI push-pull Transformer driver, designed for small Form factor, isolated power supply. It can drive 2.25 V to 5 V DC power supply. Ultra-low noise and EMI are Implemented by slew rate control of the output switch voltage and clock via spread spectrum (SSC). The SN6505ADBVT consists of an oscillator followed by a gate drive circuit, which provides Complementary output signals to drive ground-referenced N-channel power switches. equipment Includes two 1A power MOSFET switches to ensure Start up under heavy load. switch clock can Also available externally for accurate placement switching harmonics, or when operating with multiple Transformer driver. Internal protection function Includes a 1.7 A current limit, undervoltage lockout, Thermal shutdown and break-before-make circuits. The SN6505ADBVT includes a soft-start feature that prevents High inrush current during heavy load power-up capacitor. SN6505A has 160 kHz internal oscillator Ideal for applications requiring minimal emissions While the SN6505B has a 420 kHz internal oscillator For applications requiring higher efficiency and Smaller transformer size. The SN6505x can be used for Small 6-pin SOT23/DBV package. equipment operation is characterized by a temperature range From –55°C to 125°C.

2. Feature

    1. Transformer push-pull driver

    2. Wide input voltage range: 2.25 V to 5.5 V

    3. High output drive: 1 A at 5 V supply

    4. Low RON 0.25 Ω (max 4.5 V supply)

    5. Ultra low EMI

    6. Spread Spectrum Clocking

    7. Precision internal oscillator options: 160 kHz (SN6505A) and 420 kHz (SN6505B)

    8. Synchronization of multiple devices to external clock input

    9. Slew rate control

  10. 1.7 A current limit

  11. Low Shutdown Current: <1 μA

  12. Thermal shutdown

  13. Wide temperature range: –55°C to 125°C

  14. Small 6-pin SOT23 (DBV) package

  15. Soft start to reduce inrush current

3. Application

    1. Isolated power supply for CAN, RS-485, RS-422, RS-232, SPI, I2C, low power LAN

    2. Low noise isolated USB power

    3. Process control

    4. Telecom supplies

    5. Radio supplies

    6. Distribute supplies

    7. medical instruments

    8. precision instrument

    9. Low noise filament supply

4. Pin configuration

5. Pin Description

6. Application Information

The SN6505ADBVT is a transformer driver designed for low cost, small form factor, isolated DC/DC converters in a push-pull topology. The device includes an oscillator that powers the gate drive circuit. The gate driver, consisting of a frequency divider and a break-before-make (BBM) logic, provides two complementary outputs that alternately turn the two output transistors on and off. The output frequency of the oscillator is divided by an asynchronous divider that provides two complementary output signals S and S with a 50% duty cycle. The subsequent break-before-make logic inserts a dead time between the high pulses of the two signals. The resulting output signals, G1 and G2, represent the gate drive signals for output transistors Q1 and Q2. Before either gate can assume a logic high, there must be a short period of time during which both signals are low and both Transistors are high impedance. This short time, called the break-before-make time, is needed to avoid shorting the primary across both ends.