Texas Instruments' LM74670-Q1 is a controller device that can be used with an N-channel MOSFET in full- or half-bridge rectifier architectures for alternators. It is designed to drive an external MOSFET to emulate an ideal diode. A unique advantage of this scheme is that it is not ground referenced, thus it has zero IQ. The Schottky diodes in full- or half-bridge rectifiers and alternators can be replaced with the LM74670-Q1 solution to avoid forward conduction diode losses and produce more efficient AC-DC converters.
The LM74670-Q1 controller provides a gate drive for an external N-channel MOSFET and a fast response internal comparator to pull-down the MOSFET gate in the event of reverse polarity. This device can support an AC signal frequency up to 300 Hz.
| Features |
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- AEC-Q100 qualified with the following results:
- Device temperature grade 1: -40°C to 125°C ambient operating temperature range
- Exceeds HBM ESD classification level 2
- Device CDM ESD classification level C4B
- Peak input AC voltage: 42 V
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- Zero IQ
- Charge pump gate driver for external N-channel MOSFET
- Low forward-voltage drop and less power dissipation compared to Schottky diode
- Capable of handling AC signal up to 300 Hz frequency
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| Applications |
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- AC rectifiers
- Alternators
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- Power tools
- Reverse polarity protection
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Texas Instruments' LM74670-Q1 is a controller device that can be used with an N-channel MOSFET in full- or half-bridge rectifier architectures for alternators. It is designed to drive an external MOSFET to emulate an ideal diode. A unique advantage of this scheme is that it is not ground referenced, thus it has zero IQ. The Schottky diodes in full- or half-bridge rectifiers and alternators can be replaced with the LM74670-Q1 solution to avoid forward conduction diode losses and produce more efficient AC-DC converters. 
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