Key facts
- Brand
- Linear Technology
- Model
- LT3748
- Category
- DC/DC Converters
- Documents
- 2
- Languages
- EN
- Last added
- 2012-06-05
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Linear Technology LT3748 Isolated Flyback Controller Datasheet
The document introduces the LT3748 as a switching regulator controller specifically designed for flyback topology applications. It eliminates the need for third windings or opto-isolators by inferring the isolated output voltage directly from the primary-side flyback waveform.
Key features include boundary mode control (critical conduction mode) which improves load regulation, an internal gate driver capable of 1.9A average current, and a low-dropout regulator for the INTVcc pin. The device supports high-temperature operation in various grades and includes over-current protection.
Linear Technology LT3748 specifications
| Input Voltage Range | 5V to 100V |
|---|---|
| Output Voltage Sensing | Primary-Side Winding |
| Output Voltage Setting | Two External Resistors and Transformer Turns Ratio |
| Onboard Gate Driver | 1.9A |
| Regulation Accuracy | Better than ±5% |
All Linear Technology LT3748 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
Does the LT3748 require an opto-isolator?
No, the LT3748 does not require an opto-isolator or extra transformer winding to maintain regulation.
From: Linear Technology LT3748 Isolated Flyback Controller Datasheet
What is the maximum average output current of the internal gate driver?
The built-in gate driver has a capability of 1.9A average output current for both rising and falling edges.
From: Linear Technology LT3748 Isolated Flyback Controller Datasheet
What is the input voltage range of the LT3748?
The LT3748 operates over a 5V to 100V input voltage range.
Does the LT3748 require an opto-coupler?
No, the LT3748 does not require an opto-coupler.