Tanssion > blog > other > Overview of Transformer Drivers SN6505BDBVR

Overview of Transformer Drivers SN6505BDBVR

Author: Tanssion Date: 2023-11-09 Hits: 0

Ⅰ. SN6505BDBVR Description
Ⅱ. SN6505BDBVR Pinout
Ⅲ. SN6505BDBVR 3D Model
Ⅳ. SN6505BDBVR Specifications
Ⅴ. SN6505BDBVR Feature
Ⅵ. SN6505BDBVR Applications
Ⅶ. SN6505BDBVR Package Information
Ⅷ. SN650 5BDBVR Datasheet

Ⅰ. SN6505BDBVR Description 

The SN6505x 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 SN6505x 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 1.7 A current limiting, under-voltage lockout, thermal shutdown, and break-before-make circuitry. SN6505x includes a soft-start feature that prevents high inrush current during power up with large load capacitors. SN6505A has a 160 kHz internal oscillator for applications that need to minimize emissions whereas SN6505B has a 420 kHz internal oscillators for applications that require higher efficiency and smaller transformer size. The SN6505x 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.


Ⅱ. SN6505BDBVR Pinout

1. SN6505BDBVR Pinout 

2. SN6505BDBVR Pin Functions 


PIN Name 

PIN number 




Open drain output of the first power MOSFETs. Typically connected to the outer terminals of the center tap transformer. Because large currents flow through these pins, their external traces should be kept short.



This is the device supply pin. It should be bypassed with a 4.7 μF or greater, low ESR capacitor. When VCC ≤ 2.25 V, an internal undervoltage lockout circuit trips and turns both outputs off.



Open drain output of the second power MOSFETs. Typically connected to the outer terminals of the center tap transformer. Because large currents flow through these pins, their external traces should be kept short.



GND is connected to the source of the power MOSFET switches via an internal sense circuit. Because large currents flow through it, the GND terminals must be connected to a low-inductance quality ground plane.



The EN pin turns the device on or off. Grounding or leaving this pin floating disables all internal circuitry. If unused this pin should be tied directly to VCC.



This pin is used to run the device with external clock. Internally it is pulled down to GND. If valid clock is not detected on this pin, the device shifts automatically to internal clock.

Ⅲ. SN6505BDBVR 3D Model

1. SN6505BDBVR Symbol 

2. SN6505BDBVR Footprint

3. SN6505BDBVR 3D Model


Ⅳ. SN6505BDBVR Specifications



Part Status








Product Category

Transformer Drivers

Process Technology


Switching Frequency (kHz)


Input Voltage (V)

2.25 to 5.5

Output Current (A)


Minimum Operating Supply Voltage (V)


Maximum Operating Supply Voltage (V)


Maximum Supply Current (mA)


Minimum Operating Temperature (°C)


Maximum Operating Temperature (°C)



Tape and Reel


Surface Mount

Package Height


Package Width


Package Length


PCB changed


Standard Package Name


Supplier Package


Pin Count


Lead Shape


Ⅴ. SN6505BDBVR Feature

• 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 

• 1.7A Current-limit 

• Low shutdown current:

Ⅵ. SN6505BDBVR Applications

The SN6505 is a transformer driver designed for low-cost, small form-factor, isolated DC/DC converters using the push-pull topology. The device includes an oscillator that feeds a gate-drive circuit. The gate-drive, comprising a frequency divider and a break-before-make (BBM) logic, provides two complementary output signals which alternately turn the two output transistors on and off.

• 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 

• Distributed supplies 

• Medical instruments 

• Precision instruments 

• Low-noise filament supplies

Typical Application

Ⅶ. SN6505BDBVR Package Information


Ⅷ. SN6505BDBVR Datasheet

SN6505BDBVR Datasheet


Frequently Asked Questions

Leave a Comment

Related Articles

Popular Tags

PMIC Audio Products Logic Interface capacitors linear controllers embedded Line Protection drivers amplifiers Distribution Backups wireless modules memory converters Battery Products sensors filters relays Switches distribution analog Clock timing voltage diodes speakers Batteries Rechargeable battery regulators Fiber Optic Cables Cable Assemblies routers microcontroller Backups audio Magnetics - Transformer Inductor Components cables Electric Double Layer Capacitors (EDLC) Supercapa inductors transformer optoelectronics potentiometer resistors switching management special digital purpose signal Discrete Semiconductor Ceramic Capacitors semiconductor cable Alarms equipment resonators oscillators crystals kits accessories isolators motors RF Transformers monitors comparators specialized programmable microcontrollers FPGAs Data Acquisition application specific gates inverters Buffers Transceivers dividers Sensor decoders microprocessors microprocessor DC video circuit protection microphones PCB Integrated Circuits (ICs) PMIC - Lighting Memory Cards SSDs HDDs Wires Tantalum Capacitors Transducers LEDs Battery Chargers 4G Ballast Controllers Vacuum Tubes Transistors - Bipolar (BJT) - Single counter integrated circuits Guitar Parts Buzzer Elements transducers circuit Computer Equipment Piezo Benders boxes Magnetics enclosures racks Buzzers wires and Sirens wire Buzzers and Sirens inductor components connectors interconnects CR2450 LR44 Embedded Computers TXS0108EPWR fans SS14 thermal UA741CP RC4558P hardware TNY268PN fasteners MJE2955T UC3842AN TOP245YN coils SN6505BDBVR chokes BD139 controls ATMEGA328-PU automation NE5532P identification barriers signs labels protection inductor educational networking resistor powersupply power supply prototyping fabrication desoldering soldering ESD static Tapes adhesives materials Test measurement Tools Uncategorized Specialized ICs voltage Regulators contro thermal Management motor laser full half switchers batteries translators shift latches flip flops voice playback serializers deserializers active synthesis PLDs clocks delay lines reference supervisors PoE correction lighting ballast hot swap energy metering specialty parity generators checkers FIFOs multipliers instrumentation UARTs terminators capacitive touch Modems ICs Encoders DSP Data acquisition front end timers synthesizers frequency regulator controller regula RMS power OR ideal LED gate display chargers configuration proms universal bus functions multiplexers multivibrators counters processing amps telecom repeaters splitters detector interfaces I/O expanders receivers CODECs system SoC CPLDs Complex amplifier IF RFID Oscillator Externally excited oscillator fuses switchs transistors shunt thyristor Oscillators Resonators Ballast Controllers Coils Chokes RF Filters RF/IF and RFID RF Amplifiers Battery Packs SAW Filters Mica and PTFE Capacitors Accessories Piezo Benders 1 222 sdsd ballasts starter SSD HDD Modules

Popular Posts