Overview
The LT8316EFE#PBF is a micropower, high-voltage flyback controller produced by Analog Devices Inc. This device is designed to operate without the need for an opto-isolator for regulation, making it a compact and efficient solution for isolated power supplies. It samples the output voltage from the isolated flyback waveform appearing across a third winding on the transformer, enabling quasi-resonant boundary mode operation. This mode improves load regulation, reduces transformer size, and maintains high efficiency.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 16V to 560V (600V max) | V |
| Operating Junction Temperature | -40°C to 125°C (LT8316E, LT8316I), -40°C to 150°C (LT8316H) | °C |
| Storage Temperature Range | -65°C to 150°C | °C |
| Lead Temperature (Soldering, 10 sec) | 300°C | °C |
| Quiescent Current | 75µA | A |
| Feedback Voltage | 1.22V ± 5mV | V |
| Current Sense Input Bias Current | 35µA | A |
| Package Type | 20-Lead Plastic TSSOP |
Key Features
- No opto-isolator required for regulation
- Quasi-resonant boundary mode operation
- Constant-current and constant-voltage regulation
- Low-ripple light load burst mode operation
- Low quiescent current: 75µA
- Programmable current limit and soft-start
- TSSOP package with high-voltage spacing
- AEC-Q100 qualification in progress for automotive applications
Applications
The LT8316EFE#PBF is suitable for a variety of applications, including:
- Isolated power supplies
- Automotive systems (with AEC-Q100 qualified versions)
- Industrial power supplies
- High-voltage DC-DC converters
- Efficient flyback converters requiring high reliability and low quiescent current
Q & A
- What is the input voltage range of the LT8316EFE#PBF?
The input voltage range is from 16V to 560V, with a maximum of 600V.
- Does the LT8316EFE#PBF require an opto-isolator for regulation?
No, the LT8316EFE#PBF does not require an opto-isolator for regulation.
- What is the operating junction temperature range for the LT8316EFE#PBF?
The operating junction temperature range is -40°C to 125°C for LT8316E and LT8316I, and -40°C to 150°C for LT8316H.
- What is the quiescent current of the LT8316EFE#PBF?
The quiescent current is 75µA.
- What type of package does the LT8316EFE#PBF come in?
The LT8316EFE#PBF comes in a 20-Lead Plastic TSSOP package.
- Is the LT8316EFE#PBF suitable for automotive applications?
Yes, versions of the LT8316EFE#PBF are available with AEC-Q100 qualification for automotive applications.
- What is the feedback voltage of the LT8316EFE#PBF?
The feedback voltage is 1.22V ± 5mV.
- How does the LT8316EFE#PBF manage current limiting?
The current limiting is programmable via a current-sensing resistor connected to the SENSE pin.
- What is the significance of quasi-resonant boundary mode operation in the LT8316EFE#PBF?
Quasi-resonant boundary mode operation improves load regulation, reduces transformer size, and maintains high efficiency.
- How does the LT8316EFE#PBF handle light load conditions?
The device features low-ripple light load burst mode operation to manage light load conditions efficiently.
