SN6501 Low-noise, 350-mA, 410-kHz transformer driver for isolated power supplies | TI.com

SN6501 (ACTIVE) Low-noise, 350-mA, 410-kHz transformer driver for isolated power supplies

 

Description

The SN6501 is a monolithic oscillator/power-driver, specifically designed for small form factor, isolated power supplies in isolated interface applications. The device drives a low-profile, center-tapped transformer primary from a 3.3-V or 5-V DC power supply. The secondary can be wound to provide any isolated voltage based on transformer turns ratio.

The SN6501 consists of an oscillator followed by a gate drive circuit that provides the complementary output signals to drive the ground referenced N-channel power switches. The internal logic ensures break-before-make action between the two switches.

The SN6501 is available in a small SOT-23 (5) package, and is specified for operation at temperatures from –40°C to 125°C.

Features

  • Push-pull driver for small transformers
  • Single 3.3-V or 5-V supply
  • High primary-side current drive:
    • 5-V Supply: 350 mA (Max)
    • 3.3-V Supply: 150 mA (Max)
  • Low ripple on rectified output permits small output capacitors
  • Small 5-Pin SOT-23 Package

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Parametrics

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Part number Order Vin (Min) (V) Vin (Max) (V) Vout (Min) (V) Vout (Max) (V) Iout (A) Soft start Features Switching frequency (Min) (kHz) Switching frequency (Max) (kHz) Rating Operating temperature range (C) Package size: mm2:W x L (PKG) Iout (Max) (A) Shutdown current (Typ) (uA) Switch current limit (Typ) (A) Undervoltage lockout
SN6501 Order now 3     5.5     0     11     0.25     No       410     620     Catalog     -40 to 125     5SOT-23: 5 mm2: 1.6 x 2.9 (SOT-23 | 5)     0.5         0.5      
SN6505A Order now 2.25     5.5     0     16     1     Yes     Enable
Short-circuit protection
Spread spectrum clocking
Thermal shutdown
Slew-rate control    
100     600     Catalog     -55 to 125     6SOT-23: 5 mm2: 1.6 x 2.9 (SOT-23 | 6)     1.5     1     2     Vin<1.7    
SN6505B Order now 2.25     5.5     0     16     1     Yes     Enable
Short-circuit protection
Spread spectrum clocking
Thermal shutdown
Slew-rate control    
100     1600     Catalog     -55 to 125     6SOT-23: 5 mm2: 1.6 x 2.9 (SOT-23 | 6)     1.5     1     2     Vin<1.7V