Isolated PWM Controllers (V

IN

max >25V) PWM Controllers for Isolated Topologies

IN (Max)FSW (kHz)SyncUVLO Product IDDescriptionModeTopologiesV LM5020Single endedCurrentFlyback, forward, buck, or boost10050 to 1000Up LM5021AC-DC controllerCurrentFlyback, forward3050 to 500Up—LM5025A/BActive clampVoltage/feed-forwardForward active clamp105100 to 1000Up and down LM5026Active clampCurrentForward active clamp105100 to 1000Input/output LM5030Alternating outputsCurrentPush-pull, half-, or full-bridge10050 to 1000Up—LM5032Dual interleavedCurrentFlyback, forward105100 to 1000Up LM5033Alternating outputsVoltagePush-pull, half-, or full-bridge10050 to 1000Up—LM5034Dual interleaved active clampCurrent Forward active clamp105100 to 1000Up LM5035Half-bridge controller and gate driverVoltageHalf-bridge100100 to 1000Up LM5041/ABuck-fed cascade alternating outputsCurrentCurrent or voltage fed push-pull, bridge10050 to 1000Up LM5115Secondary-side post regulatorVoltage/current-injectionSynchronous secondary-side post regulator75100 to 1000Up—LM25115Secondary-side post regulatorVoltage/current-injectionSynchronous secondary-side post regulator42100 to 1000Up—

Power Supply Feedback Control/Opto-Coupler Driver Circuits

Product IDFunction Output Tolerance (%) Other Features/Comments Temp Range (°C)Packaging LM3411 Precision 3.3V and 5.0V secondary regulator/driver Current for control of regulator (20 µA to 15 mA) 0.5 and 1.0 Custom voltages available (3V to 17V) -40 to 125 SOT23-5 LM3460 Precision 1.2V and 1.5V secondary regulator/driverCurrent for control of regulator (20 µA to 15 mA) 1.0Can also be used for GTL, GTLp bus voltage control -40 to 125 SOT23-5

LM5026 Features

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Current mode control LM5026 Simplified Forward Power Converter with Active Clamp Reset

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Internal 100V start-up bias regulator• 3A compound main gate driver • High bandwidth opto-coupler interface • Programmable Line Under-Voltage Lockout (UVLO) with adjustable hysteresis

IN V OUT 36V to 78V 3.3V ErrorAmp andIsolation 30A CST1 SYNC I/O V V CC LM5026 CSOUT_AOUT_BREFCOMPSYNCSSV IN UVLOTIME RES RTDCLPGNDAGND

Introduction to forward power converters utilizing active clamp reset 6