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LM5035 数据表(PDF) 25 Page - National Semiconductor (TI) |
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LM5035 数据表(HTML) 25 Page - National Semiconductor (TI) |
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25 / 28 page  Application Circuit Example The following schematic shows an example of a 100W half- bridge power converter controlled by the LM5035. The op- erating input voltage range (V PWR) is 36V to 75V, and the output voltage is 3.3V. The output current capability is 30 Amps. Current sense transformer T2 provides information to the CS pin for current limit protection. The error amplifier and reference, U3 and U5 respectively, provide voltage feedback via opto-coupler U4. Synchronous rectifiers Q4, Q5, Q6 and Q7 minimize rectification losses in the secondary. An auxil- iary winding on transformer T1 provides power to the LM5035 VCC pin when the output is in regulation. The input voltage UVLO thresholds are )34V for increasing V PWR, and )32V for decreasing V PWR. The circuit can be shut down by driving the ON/OFF input (J2) below 1.25V with an open-collector or open-drain circuit. An external synchroniz- ing frequency can be applied through a 100pF capacitor to the RT input (U1 pin 5). The regulator output is current limited at )34A. www.national.com 25 |
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