SN6505B - Low-noise 1-A, 420kHz transformer driver for isolated power supplies

Updated : 2020-01-09 14:32:15
Description

The SN6505x is alow-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 throughSpread Spectrum Clocking (SSC). The SN6505x consists of an oscillator followed by a gate drive circuit thatprovides the complementary output signals to drive ground-referenced N-channel power switches. Thedevice includes two 1-A Power-MOSFET switches to ensure start-up under heavy loads. The switchingclock can also be provided externally for accurate placement of switcher harmonics, or whenoperating with multiple transformer drivers. The internal protection features include a 1.7 Acurrent limiting, under-voltage lockout, thermal shutdown, and break-before-make circuitry.SN6505x includes a soft-startfeature that prevents high inrush current during power up with large load capacitors. The SN6505 isavailable in a small 6-pin SOT23/DBV package. The device operation is characterized for atemperature range from –55°C to125°C.

Products containing the "SN6505B" keyword are: SN6505BDBVR , SN6505BDBVR , SN6505BDBVR/SN6505BDBVT , SN6505BDBVT , SN6505BDBVT , SN6505BEVM , SN6505BEVM
Features

  • 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

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Parametrics
StatusACTIVE
SubFamilyTransformer driver
Isolation rating
Surge Voltage Rating
DIN V VDE V 0884-10 transient overvoltage rating
DIN V VDE V 0884-10 working voltage
CSA 60950-1 basic working
CSA 60950-1 reinforced working
CSA 61010-1 basic working
CSA 61010-1 reinforced working
CSA 60601-1 reinforced working
CSA isolation rating
TUV EN 60950-1 Basic Working
TUV EN 60950-1 Reinforced Working
TUV EN 61010-1 Basic Working
TUV EN 61010-1 Reinforced Working
TUV Isolation Rating
Operating temperature range-55 to 125
Package GroupSOT-23|6
Package size: mm2:W x L (PKG)[pf]6SOT-23[/pf]: 8 mm2: 2.8 x 2.9 (SOT-23|6)
Approx. price0.98 | 1ku
RatingCatalog