LM5035

SNVS428H – JANUARY 2006 – REVISED OCTOBER 2015

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8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers must

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The following information is intended to provide guidelines for the power-supply designer using the LM5035.

8.2 Typical Application

Figure 15 shows an example of a 100-W half-bridge power converter controlled by the LM5035. The operating

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 through optocoupler U4. Synchronous rectifiers

(Q4, Q5, Q6, and Q7) minimize rectification losses in the secondary. An auxiliary winding on transformer T1

provides power to the LM5035 VCC pin when the output is in regulation. The input voltage UVLO thresholds are

ON/OFF input (J2) below 1.25 V with an open-collector or open-drain circuit. An external synchronizing

frequency can be applied through a 100-pF capacitor to the RT input (U1 pin 5). The regulator output is current

limited at

≊ 34 A.

20

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