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SN6501DBVR

350mA push-pull transformer driver, 3.3/5V, 410kHz, isolated PSU, SOT-23-5

5400

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Pieza del fabricante：

SN6501DBVR

Paquete：

SOT-23-5 (2.90 x 1.60 x 1.10 mm)

Marca：
Categorías de productos：
Compromiso de calidad
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Descripción

Productos

The SN6501DBVR from Texas Instruments is a low-noise 350 mA transformer driver for isolated power supplies in a 5-pin SOT-23 package. It drives a center-tapped transformer primary from 3.3 V or 5 V DC, generating isolated output voltage based on the transformer turns ratio at 410 kHz switching frequency.

Especificaciones

Input Voltage 3.0 V to 5.5 V
Primary Drive Current 350 mA at 5 V, 150 mA at 3.3 V
Switching Frequency 410 kHz typical (300-620 kHz range)
Switch Current Limit 500 mA typical
Topology Push-pull
Isolation Determined by transformer
Output Voltage Any (set by transformer turns ratio)
Temperatura de funcionamiento -40°C to +125°C
Paquete SOT-23-5

Características

  • Push-pull driver for small center-tapped transformers
  • Single 3.3 V or 5 V supply operation
  • Internal oscillator with no external components required
  • Break-before-make switching prevents shoot-through
  • Low output ripple allows small output capacitors
  • Compact 5-pin SOT-23 package
  • No external MOSFETs required
  • High efficiency with integrated power switches

Aplicaciones

  • Isolated RS-485, CAN, I2C, and SPI interfaces
  • Industrial automation and process control
  • Medical equipment isolated power
  • Isolated sensor and measurement systems

The SN6501DBVR from Texas Instruments is a monolithic oscillator and power driver specifically designed for small form factor isolated power supplies in isolated interface applications. It drives the primary of a low-profile center-tapped transformer from a 3.3 V or 5 V DC supply, and the secondary winding can be configured for any isolated output voltage based on the transformer turns ratio. The device integrates two N-channel power MOSFET switches that alternate in a push-pull configuration, driven by an internal oscillator at approximately 410 kHz. Break-before-make logic ensures that both switches are never on simultaneously, preventing shoot-through current that could damage the device or transformer. The push-pull topology inherently provides low output ripple after rectification, enabling the use of small output capacitors. With primary-side drive capability of 350 mA at 5 V supply, the SN6501 can deliver several watts of isolated power depending on the transformer specification. The compact SOT-23-5 package minimizes board space, making it ideal for space-constrained isolated interface designs.

The SN6501DBVR operates through three functional blocks: (1) The internal oscillator generates a 410 kHz (typical) clock signal that alternately enables the two N-channel power switches. The oscillator is fully internal, requiring no external timing components. The frequency varies from 300 kHz to 620 kHz across process and temperature. (2) The gate drive circuit receives the oscillator output and generates complementary drive signals for the two internal N-channel MOSFETs. A break-before-make delay of approximately 50 ns ensures both switches are off before the alternate switch turns on, preventing cross-conduction. The switches drive the two ends of the center-tapped transformer primary alternately to ground, while the center tap connects to VCC. (3) The transformer converts the primary switching waveform to a secondary voltage determined by the turns ratio. Full-wave rectification using two diodes on the secondary produces a DC output with ripple at twice the switching frequency (820 kHz), which is easily filtered with a small capacitor. The secondary is galvanically isolated from the primary, with the isolation rating determined entirely by the transformer specification.

Pin No. Nombre de la clavija Función
1 VIN Input supply voltage (3.0-5.5 V) and transformer center tap
2 GND Suelo
3 D1 Switch output 1 (to transformer primary end 1)
4 D2 Switch output 2 (to transformer primary end 2)
5 VIN Input supply voltage (connected to pin 1 internally)
  • Isolated RS-485 bus interfaces where the SN6501 provides isolated 5 V power to the bus-side transceiver alongside digital isolators for signal isolation
  • Isolated CAN bus systems in industrial automation requiring galvanically isolated power and data for noise immunity and safety compliance
  • Medical equipment isolated sensor interfaces where the transformer-based isolation meets IEC 60601 creepage and clearance requirements
  • Isolated I2C and SPI interfaces in multi-voltage systems where ground loops between domains must be eliminated
Modelo Marca Vin Iprimary Paquete
SN6505DBVR TI 2.7-5.5 V 1 A SOT-23-6
SN6501DBVT TI 3.0-5.5 V 350 mA SOT-23-5
DCH010505S Murata 5 V 1 W SMD module
RMF4P3375D RECOM 3.3 V 1 W SIP4
AM1S-0505SZ Aimtec 5 V 1 W SMD module
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