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MOSFET driver works without signal transformer

Posted: 10 Apr 2014     Print Version  Bookmark and Share

Keywords:Linear Technology  MOSFET  signal transformer  forward converter 

Linear Technology has announced a high efficiency secondary-side MOSFET driver that operates without the need for primary control in an isolated synchronous forward converter. According to the company, the LT8311's preactive mode cuts the need for a signal transformer for primary to secondary-side communication by sensing signals on the secondary side to control synchronous rectification. This mode reduces component count and solution size, added Linear Tech.

The device operates over a 3.7-30V input voltage range and is used with a primary-side IC, such as the LT3752/-1. The complete forward converter can operate with input voltages ranging from 6.5V up to 400V+ making it ideal for a range of applications including hybrid/electric vehicle automotive requirements. It combines a 10mA opto-driver and a feedback loop error amplifier to enable output voltage feedback from the secondary to the primary side.


The entire system provides fixed frequency peak current mode control that has excellent line/load regulation and fast transient response. Additional features include a 1.5 per cent reference voltage, a power-good monitor and programmable soft-start of the output voltage.

The IC comes in a TSSOP-20 package with several pins removed for high peak-voltage spacing, in E- and I-grade (-40°C to 125°C junction temperature), H grade (-40°C to 150°C) and MP grade (-55°C to 150°C), from $3.06 (1000).

- Graham Prophet
  EE Times Europe

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