SN6505B-Q1 Automotive, low-noise 1-A, 420-kHz transformer driver for isolated power supplies | TI.com

SN6505B-Q1
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Automotive, low-noise 1-A, 420-kHz transformer driver for isolated power supplies

 

Description

The SN6505x-Q1 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. Very low noise and EMI are achieved by slew rate control of the output switch voltage and through Spread Spectrum Clocking (SSC). The SN6505x-Q1 consists of an oscillator followed by 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 1.7 A current limiting, under-voltage lockout, thermal shutdown, and break-before-make circuitry. SN6505A-Q1 and SN6505B-Q1 include a soft-start feature that prevents high inrush current during power up with large load capacitors. Soft-start feature has been disabled in SN6505D-Q1 for applications that require fast output start-up. SN6505A-Q1 has a 160 kHz internal oscillator for applications that need to minimize emissions whereas SN6505B-Q1 and SN6505D-Q1 have a 420 kHz internal oscillators for applications that require higher efficiency and smaller transformer size. The SN6505x-Q1 is available in a small 6-pin SOT23/DBV package. The device operation is characterized for a temperature range from -40°C to 125°C.

Features

  • AEC-Q100 (Grade 1) qualified for automotive applications
    • Device temperature grade 1: –40°C to +125°C, TA
  • 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
  • Reduced conducted and radiated EMI
  • Spread spectrum clocking
  • Precision internal oscillator options: 160 kHz (SN6505A-Q1) and 420 kHz (SN6505B-Q1 and SN6505D-Q1)
  • Synchronization of multiple devices with external clock input
  • Slew-rate control
  • 1.7 A Current-limit
  • Low shutdown current: <1 µA
  • Thermal shutdown
  • Small 6-Pin SOT23 (DBV) package
  • Soft-start enabled (SN6505A-Q1 and SN6505B-Q1) to reduce in-rush current and soft-start disabled (SN6505D-Q1) for fast start-up

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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
SN6505B-Q1 Order now 2.25     5.5     0     16     1     Yes     Enable
Short-circuit protection
Spread spectrum clocking
Thermal shutdown
Slew-rate control    
100     1600     Automotive     -40 to 125     6SOT-23: 5 mm2: 1.6 x 2.9 (SOT-23 | 6)     1.5     1     2     Vin<1.7V    
SN6501-Q1 Order now 3     5.5     0     11     0.25     No       410     620     Automotive     -40 to 125     5SOT-23: 5 mm2: 1.6 x 2.9 (SOT-23 | 5)     0.5         0.5      
SN6505A-Q1 Order now 2.25     5.5     0     16     1     Yes     Enable
Short-circuit protection
Spread spectrum clocking
Thermal shutdown
Slew-rate control    
100     600     Automotive     -40 to 125     6SOT-23: 5 mm2: 1.6 x 2.9 (SOT-23 | 6)     1.5     1     2     Vin<1.7    
SN6505D-Q1 Order now 2.25     5.5     0     16     1     No     Enable
Short-circuit protection
Spread spectrum clocking
Thermal shutdown
Slew-rate control    
100     1600     Automotive     -40 to 125     6SOT-23: 5 mm2: 1.6 x 2.9 (SOT-23 | 6)     1.5     1     2     Vin<1.7V