Overview
The SN6501DBVT from Texas Instruments is a monolithic oscillator/power-driver designed specifically for small form factor, isolated power supplies in isolated interface applications. This device drives a low-profile, center-tapped transformer primary from either a 3.3-V or 5-V DC power supply. The secondary can be wound to provide any isolated voltage based on the transformer turns ratio. The SN6501 consists of an oscillator followed by a gate drive circuit that provides complementary output signals to drive ground-referenced N-channel power switches, ensuring break-before-make action between the two switches. It is available in a small 5-Pin SOT-23 package and is specified for operation at temperatures from –40°C to 125°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage | 3.3 V or 5 V | V |
| Primary-side Current Drive (5 V Supply) | 350 mA (Max) | mA |
| Primary-side Current Drive (3.3 V Supply) | 150 mA (Max) | mA |
| Output Switch Voltage (VCC = 5 V) | 0 to 11 V | V |
| Output Switch Voltage (VCC = 3.3 V) | 0 to 7.2 V | V |
| Ambient Temperature Range | –40°C to 125°C | °C |
| Package Type | SOT-23 (5) | - |
| Package Size | 2.90 mm x 1.60 mm | mm |
| Switching Frequency | 300 to 620 kHz (VCC = 5 V), 250 to 550 kHz (VCC = 3.3 V) | kHz |
| Output Rise Time | 70 ns (VCC = 3.3 V), 80 ns (VCC = 5 V) | ns |
| Output Fall Time | 110 ns (VCC = 3.3 V), 60 ns (VCC = 5 V) | ns |
| Break-before-make Time | 150 ns (VCC = 3.3 V), 50 ns (VCC = 5 V) | ns |
Key Features
- Push-pull driver for small transformers
- Single 3.3-V or 5-V supply
- High primary-side current drive
- Low ripple on rectified output, allowing for small output capacitors
- Small 5-Pin SOT-23 package
- Internal logic ensures break-before-make action between the two switches
- Operates over a temperature range of –40°C to 125°C
Applications
- Isolated interface power supply for CAN, RS-485, RS-422, RS-232, SPI, I2C, and Low-Power LAN
- Industrial automation
- Process control
- Medical equipment
Q & A
- What is the primary function of the SN6501DBVT?
The SN6501DBVT is a monolithic oscillator/power-driver designed for driving small transformers in isolated power supply applications.
- What are the possible supply voltages for the SN6501DBVT?
The device can operate with either a 3.3-V or 5-V DC power supply.
- What is the maximum primary-side current drive for the SN6501DBVT?
The maximum primary-side current drive is 350 mA for a 5-V supply and 150 mA for a 3.3-V supply.
- What is the package type and size of the SN6501DBVT?
The device is available in a small 5-Pin SOT-23 package, measuring 2.90 mm x 1.60 mm.
- What is the temperature range for the SN6501DBVT?
The device is specified for operation at temperatures from –40°C to 125°C.
- What are some common applications for the SN6501DBVT?
Common applications include isolated interface power supplies for various communication protocols, industrial automation, process control, and medical equipment.
- How does the SN6501DBVT ensure safe switching between its output switches?
The internal logic of the SN6501DBVT ensures break-before-make action between the two output switches.
- What is the typical switching frequency range of the SN6501DBVT?
The switching frequency range is 300 to 620 kHz for a 5-V supply and 250 to 550 kHz for a 3.3-V supply.
- What are the output rise and fall times for the SN6501DBVT?
The output rise time is 70 ns for a 3.3-V supply and 80 ns for a 5-V supply. The output fall time is 110 ns for a 3.3-V supply and 60 ns for a 5-V supply.
- How does the SN6501DBVT benefit from its low ripple output?
The low ripple on the rectified output allows for the use of small output capacitors.
