Overview
The SN6505BDBVR, produced by Texas Instruments, is a low-noise, 1-A, 420-kHz transformer driver specifically designed for small form factor, isolated power supplies. This integrated circuit (IC) is optimized for driving low-profile, center-tapped transformers from a 2.25 V to 5.5 V DC power supply. It features ultra-low noise and EMI, achieved through slew rate control of the output switch voltage and Spread Spectrum Clocking (SSC). The device includes an oscillator followed by a gate drive circuit that provides complementary output signals to drive ground-referenced N-channel power switches, ensuring reliable start-up under heavy loads.
Key Specifications
| Parameter | Value |
|---|---|
| Input Voltage Range | 2.25 V to 5.5 V |
| Output Drive | 1 A at 5 V supply |
| RON | 0.25 Ω max at 4.5 V supply |
| Internal Oscillator Frequency | 420 kHz |
| Current Limit | 1.7 A |
| Shutdown Current | <1 µA |
| Thermal Shutdown | Yes |
| Operating Temperature Range | –55°C to 125°C |
| Package Type | 6-Pin SOT23 (DBV) |
| Soft-Start Feature | Yes, to reduce inrush current |
Key Features
- Push-pull driver for transformers
- Ultra-low EMI and noise through slew rate control and Spread Spectrum Clocking (SSC)
- Precision internal oscillator options: 420 kHz for SN6505B
- Synchronization of multiple devices with external clock input
- Slew-rate control for output switch voltage
- High output drive: 1 A at 5 V supply
- Low RON: 0.25 Ω max at 4.5 V supply
- Current limiting: 1.7 A
- Thermal shutdown and under-voltage lockout
- Break-before-make circuitry
- Soft-start feature to reduce inrush current
- Low shutdown current: <1 µA
- Compact 6-Pin SOT23 (DBV) package
Applications
- Isolated DC-DC converters in portable electronics and IoT devices
- Industrial sensors and monitoring equipment requiring isolated power supplies
- Communications equipment for signal conditioning and data transmission
- Medical devices such as patient monitors, infusion pumps, and diagnostic equipment
- Automotive electronics for sensors, actuators, and control modules
- Isolated gate drivers and isolated power for small loads
Q & A
- Question: What is the primary function of the SN6505BDBVR?
Answer: The SN6505BDBVR is a low-noise, 1-A, 420-kHz transformer driver designed for small form factor, isolated power supplies. - Question: What is the input voltage range of the SN6505BDBVR?
Answer: The input voltage range is 2.25 V to 5.5 V. - Question: How does the SN6505BDBVR reduce EMI?
Answer: The SN6505BDBVR reduces EMI through slew rate control of the output switch voltage and Spread Spectrum Clocking (SSC). - Question: What is the maximum current limit of the SN6505BDBVR?
Answer: The maximum current limit is 1.7 A. - Question: Does the SN6505BDBVR have thermal shutdown protection?
Answer: Yes, the SN6505BDBVR includes thermal shutdown protection. - Question: What is the operating temperature range of the SN6505BDBVR?
Answer: The operating temperature range is –55°C to 125°C. - Question: Is the SN6505BDBVR suitable for battery-powered devices?
Answer: Yes, it is suitable due to its low quiescent current and wide input voltage range. - Question: Can the SN6505BDBVR be used in harsh environmental conditions?
Answer: Yes, it operates reliably in harsh environments with a temperature range of –55°C to 125°C. - Question: What package type is the SN6505BDBVR available in?
Answer: It is available in a 6-Pin SOT23 (DBV) package. - Question: Does the SN6505BDBVR have a soft-start feature?
Answer: Yes, it includes a soft-start feature to reduce inrush current during power-up.
