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reference designSN6505

Texas Instruments SN6505

SN6505 Low-Noise 1-A Transformer Drivers for Isolated Power Supplies

Overview

TopologyPush-Pull Converter symmetrical isolated
Input voltage3.3 V
Switching frequency138-203 kHz
Output 15 V / 0.1 A
IC revisionF

Description

The SN6505 is a low-noise, low-EMI push-pulltransformer driver, specifically designed for smallform factor, isolated power supplies. It drives low profile,center-tapped transformers from a 2.25 V to5 V DC power supply. Ultra-low noise and EMI areachieved by slew rate control of the output switchvoltage and through Spread Spectrum Clocking(SSC). The SN6505 consists of an oscillator followedby 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.

Features

1- 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 ExternalClock 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

Typical applications

  • Low-Noise Isolated USB Supplies, Telecom Supplies, Radio Supplies, Distributed Supplies, Low-Noise Filament Supplies
  • Medical Instruments, Precision Instruments
  • Isolated Power Supply for CAN, RS-485, RS-422, RS-232, SPI, I2C, Low-Power LAN

More information

Parts approved by Texas Instruments

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Order Code
Data­sheet
Downloads
Status
Product series
VIN
VOut1(V (DC))
IOut1(A)
Type of Insulation
fswitch(kHz)
∫Udt(Vµs)
NPRI : NSEC
L(µH)
VT(V (AC))
L(mm)
W(mm)
H(mm)
Mount
SamplesAvailability & Sample
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760390013
SPECWE-PPTI Push-Pull Transformers, 3.3 V (DC), 5 V (DC)
Availability
–
Downloads8 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-PPTI Push-Pull Transformers
Input Voltage 3.3 V (DC)
Output Voltage 15 V (DC)
Output Current 10.5 A
Type of InsulationFunctional 
Switching Frequency 250 - 550
Voltage-µSecond11 Vµs
Turns Ratio1:1.7 
Inductance475 µH
Insulation Test Voltage2500 V (AC)
Length6.73 mm
Width10.2 mm
Height4.19 mm
MountSMT 
–Check availability
760390015
SPECWE-PPTI Push-Pull Transformers, 3.3 V (DC), 5 V (DC)
Availability
–
Downloads8 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-PPTI Push-Pull Transformers
Input Voltage 3.3 V (DC)
Output Voltage 15 V (DC)
Output Current 10.45 A
Type of InsulationFunctional 
Switching Frequency 250 - 550
Voltage-µSecond11 Vµs
Turns Ratio1:2 
Inductance475 µH
Insulation Test Voltage2500 V (AC)
Length6.73 mm
Width10.2 mm
Height4.19 mm
MountSMT 
–Check availability
760390011
SPECWE-PPTI Push-Pull Transformer, 3.3 V (DC), 3.3 V (DC)
Availability
–
Downloads4 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product series WE-PPTI Push-Pull Transformer
Input Voltage 3.3 V (DC)
Output Voltage 13.3 V (DC)
Output Current 10.1 A
Type of InsulationFunctional 
Switching Frequency 250 - 550
Voltage-µSecond7 Vµs
–
Inductance1000 µH
Insulation Test Voltage1500 V (AC)
Length6.73 mm
Width10.2 mm
Height4.19 mm
MountSMT 
–Check availability
750313769
SPECWE-PPTI Push-Pull Transformers, 3.3 V (DC), 5 V (DC)
Availability
–
Downloads8 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-PPTI Push-Pull Transformers
Input Voltage 3.3 V (DC)
Output Voltage 15 V (DC)
Output Current 10.6 A
Type of InsulationReinforced 
Switching Frequency 250 - 550
Voltage-µSecond10 Vµs
Turns Ratio1:1.7 
Inductance340 µH
Insulation Test Voltage5000 V (AC)
Length9.14 mm
Width12.7 mm
Height7.62 mm
MountSMT 
–Check availability
750313626
SPECWE-PPTI Push-Pull Transformers, 3.3 V (DC), 5 V (DC)
Availability
–
Downloads8 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-PPTI Push-Pull Transformers
Input Voltage 3.3 V (DC)
Output Voltage 15 V (DC)
Output Current 10.5 A
Type of InsulationReinforced 
Switching Frequency 250 - 550
Voltage-µSecond10 Vµs
Turns Ratio1:2 
Inductance340 µH
Insulation Test Voltage5000 V (AC)
Length9.14 mm
Width12.7 mm
Height7.62 mm
MountSMT 
–Check availability
750316028
SPECWE-PPTI Push-Pull Transformers, 3.3 V (DC), 3.3 V (DC)

PCN pending

Due to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff.

Availability
–
Downloads8 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-PPTI Push-Pull Transformers
Input Voltage 3.3 V (DC)
Output Voltage 13.3 V (DC)
Output Current 10.8 A
Type of InsulationFunctional 
Switching Frequency 400 - 700
Voltage-µSecond13 Vµs
Turns Ratio1:1.75 
Inductance86 µH
Insulation Test Voltage2500 V (AC)
Length8.3 mm
Width12.6 mm
Height4.1 mm
MountSMT 
–Check availability
750316029
SPECWE-PPTI Push-Pull Transformers, 3.3 V (DC), 5 V (DC)

PCN pending

Due to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff.

Availability
–
Downloads8 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-PPTI Push-Pull Transformers
Input Voltage 3.3 V (DC)
Output Voltage 15 V (DC)
Output Current 10.6 A
Type of InsulationFunctional 
Switching Frequency 400 - 700
Voltage-µSecond8.9 Vµs
Turns Ratio1:2.1 
Inductance72 µH
Insulation Test Voltage2500 V (AC)
Length8.3 mm
Width12.6 mm
Height4.1 mm
MountSMT 
–Check availability
750316031
SPECWE-PPTI Push-Pull Transformers, 3.3 V (DC), 3.3 V (DC)
Availability
–
Downloads8 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-PPTI Push-Pull Transformers
Input Voltage 3.3 V (DC)
Output Voltage 13.3 V (DC)
Output Current 10.9 A
Type of InsulationReinforced 
Switching Frequency 150 - 700
Voltage-µSecond40 Vµs
Turns Ratio1:1.75 
Inductance370 µH
Insulation Test Voltage5000 V (AC)
Length12.32 mm
Width15.41 mm
Height11.89 mm
MountSMT 
–Check availability
750316032
SPECWE-PPTI Push-Pull Transformers, 3.3 V (DC), 5 V (DC)
Availability
–
Downloads8 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-PPTI Push-Pull Transformers
Input Voltage 3.3 V (DC)
Output Voltage 15 V (DC)
Output Current 10.9 A
Type of InsulationReinforced 
Switching Frequency 150 - 700
Voltage-µSecond40 Vµs
Turns Ratio1:2 
Inductance370 µH
Insulation Test Voltage5000 V (AC)
Length12.32 mm
Width15.41 mm
Height11.89 mm
MountSMT 
–Check availability
750315371
SPECWE-PPTI Push-Pull Transformers, 4.5 - 5.5 V (DC), 5 V (DC)

PCN pending

Due to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff.

Availability
–
Downloads8 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-PPTI Push-Pull Transformers
Input Voltage 4.5 - 5.5 V (DC)
Output Voltage 15 V (DC)
Output Current 11 A
Type of InsulationFunctional 
Switching Frequency 400 - 700
Voltage-µSecond8.6 Vµs
Turns Ratio1:1.1 
Inductance72 µH
Insulation Test Voltage2500 V (AC)
Length8.3 mm
Width12.6 mm
Height4.1 mm
MountSMT 
–Check availability
750316030
SPECWE-PPTI Push-Pull Transformers, 4.5 - 5.5 V (DC), 3.3 V (DC)

PCN pending

Due to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff.

Availability
–
Downloads8 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-PPTI Push-Pull Transformers
Input Voltage 4.5 - 5.5 V (DC)
Output Voltage 13.3 V (DC)
Output Current 11.2 A
Type of InsulationFunctional 
Switching Frequency 400 - 700
Voltage-µSecond10.2 Vµs
Turns Ratio1.3:1 
Inductance94 µH
Insulation Test Voltage2500 V (AC)
Length8.3 mm
Width12.6 mm
Height4.1 mm
MountSMT 
–Check availability
750316033
SPECWE-PPTI Push-Pull Transformers, 4.5 - 5 V (DC), 3.3 V (DC)
Availability
–
Downloads8 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-PPTI Push-Pull Transformers
Input Voltage 4.5 - 5 V (DC)
Output Voltage 13.3 V (DC)
Output Current 11 A
Type of InsulationReinforced 
Switching Frequency 150 - 800
Voltage-µSecond40 Vµs
Turns Ratio1.3:1 
Inductance370 µH
Insulation Test Voltage5000 V (AC)
Length12.32 mm
Width15.41 mm
Height11.89 mm
MountSMT 
–Check availability
760390012
SPECWE-PPTI Push-Pull Transformers, 5 V (DC), 5 V (DC)
Availability
–
Downloads8 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-PPTI Push-Pull Transformers
Input Voltage 5 V (DC)
Output Voltage 15 V (DC)
Output Current 10.75 A
Type of InsulationFunctional 
Switching Frequency 300 - 620
Voltage-µSecond11 Vµs
Turns Ratio1:1.1 
Inductance475 µH
Insulation Test Voltage2500 V (AC)
Length6.73 mm
Width10.2 mm
Height4.19 mm
MountSMT 
–Check availability
760390014
SPECWE-PPTI Push-Pull Transformers, 5 V (DC), 5 V (DC)
Availability
–
Downloads8 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-PPTI Push-Pull Transformers
Input Voltage 5 V (DC)
Output Voltage 15 V (DC)
Output Current 10.6 A
Type of InsulationFunctional 
Switching Frequency 300 - 620
Voltage-µSecond11 Vµs
Turns Ratio1:1.3 
Inductance475 µH
Insulation Test Voltage2500 V (AC)
Length6.73 mm
Width10.2 mm
Height4.19 mm
MountSMT 
–Check availability
750313734
SPECWE-PPTI Push-Pull Transformers, 5 V (DC), 5 V (DC)
Availability
–
Downloads8 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-PPTI Push-Pull Transformers
Input Voltage 5 V (DC)
Output Voltage 15 V (DC)
Output Current 10.8 A
Type of InsulationReinforced 
Switching Frequency 300 - 620
Voltage-µSecond10 Vµs
Turns Ratio1:1.1 
Inductance340 µH
Insulation Test Voltage5000 V (AC)
Length9.14 mm
Width12.7 mm
Height7.62 mm
MountSMT 
–Check availability
750313638
SPECWE-PPTI Push-Pull Transformers, 5 V (DC), 5 V (DC)
Availability
–
Downloads8 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-PPTI Push-Pull Transformers
Input Voltage 5 V (DC)
Output Voltage 15 V (DC)
Output Current 10.65 A
Type of InsulationReinforced 
Switching Frequency 300 - 620
Voltage-µSecond10 Vµs
Turns Ratio1:1.3 
Inductance340 µH
Insulation Test Voltage5000 V (AC)
Length9.14 mm
Width12.7 mm
Height7.62 mm
MountSMT 
–Check availability
750313710
SPECWE-PPTI Push-Pull Transformers, 5 V (DC), 3.3 V (DC)
Availability
–
Downloads8 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-PPTI Push-Pull Transformers
Input Voltage 5 V (DC)
Output Voltage 13.3 V (DC)
Output Current 10.65 A
Type of InsulationFunctional 
Switching Frequency 250 - 620
Voltage-µSecond11 Vµs
Turns Ratio1.23:1 
Inductance475 µH
Insulation Test Voltage2500 V (AC)
Length6.73 mm
Width10.2 mm
Height4.19 mm
MountSMT 
–Check availability
750315240
SPECWE-PPTI Push-Pull Transformers, 5 V (DC), 5 V (DC)
Availability
–
Downloads8 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-PPTI Push-Pull Transformers
Input Voltage 5 V (DC)
Output Voltage 15 V (DC)
Output Current 11 A
Type of InsulationReinforced 
Switching Frequency 150 - 800
Voltage-µSecond46 Vµs
Turns Ratio1:1.1 
Inductance440 µH
Insulation Test Voltage5000 V (AC)
Length12.32 mm
Width15.41 mm
Height11.89 mm
MountSMT 
–Check availability