■Overview
In quasi-resonance-type AC/DC power supplies, losses in the secondary side rectifier device can be reduced in comparison to a conventional diode rectifier by using simultaneous rectification on the secondary side with a <MM3473 Series> and MOSFET combination.
§ Features
1. |
Simultaneous rectifier MOSFET is controlled using secondary side detection signal alone. |
2. |
Erroneous operations due to ringing can be prevented by adjusting minimum on time |
3. |
Reverse currents due to sudden short switching on the primary side, which occurs under load variation, in burst mode etc., can be prevent using a function for estimating/monitoring the primary-side on time |
4. |
Off timing can be adjusted using an external resistor |
5. |
Switching by changing to unloaded mode terminal voltage is stopped, enabling current consumed by IC to be minimized. |
§ Main specifications (Representative Rank MM3473XFFE)
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|
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Unloaded mode current consumption |
200µA typ. |
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Power supply voltage range |
8.0 to 28.0V |
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Drive voltage |
5.5V typ. |
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Switching frequency |
25kHz to 200kHz |
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External dimensions |
5.0ﾗ6.2ﾗ1.55 (Unit:mm) |
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Package |
SOP-8D |
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