Linear Technology recently announced the LT8310, which is a resonant-reset forward converter controller that drives an external low side N-channel MOSFET from an internally regulated 10-V supply. The LT8310 features duty mode control to generate a stable, regulated, isolated output using a single power transformer. With the addition of output voltage feedback, via optocoupler (isolated) or directly wired (nonisolated), current mode regulation is activated, improving output accuracy and load response. A choice of transformer turns ratio makes high step-down or step-up ratios possible without operating at duty cycle extremes.
The switching frequency is programmable from 100 kHz to 500 kHz to optimize efficiency, performance or external component size. A synchronous output is available for controlling secondary side synchronous rectification to improve efficiency. User programmable protection features include monitors on input voltage (UVLO and OVLO) and switch current (overcurrent limit). A soft-start feature helps prevent transformer flux saturation.
The LT8310 main features include:
- Input voltage range: 6 V to 100 V
- Duty mode control regulates an isolated output without an opto
- High efficiency synchronous control
- Short-circuit (Hiccup mode) overcurrent protection
- Programmable OVLO and UVLO with hysteresis
- Programmable frequency (100 kHz to 500 kHz)
- Synchronizable to an external clock
- Positive or negative polarity output voltage feedback with a single FBX pin
- Programmable soft-start
- Shutdown current < 1 μA
The LT8310 is available in an FE20 TSSOP with high voltage pin spacing
Sponsor this ArticleCircuit Cellar's editorial team comprises professional engineers, technical editors, and digital media specialists. You can reach the Editorial Department at editorial@circuitcellar.com, @circuitcellar, and facebook.com/circuitcellar
Leave a Comment