PWM Controllers & Power Management ICs — SMPS, Offline Switcher

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2026/05/06

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PWM Controllers & Power Management ICs — SMPS, Offline Switcher & Timer ICs PWM (Pulse Width Modulation) controller ICs are the brain of switching power supplies — they regulate output voltage and current by controlling the duty cycle of a power switch. This collection covers the most commonly needed PWM controller and power management ICs for LCD monitor/TV power board repair, USB charger repair, and offline SMPS design. Also includes the classic NE555 timer IC for PWM generation, oscillator, and timing applications. LCD Monitor & TV Power Board ICs (Fuji Electric FA55xx Series) FA5501: Current-mode PWM controller — flyback converter primary-side control in LCD power boards FA5511: Quasi-resonant PWM controller — high-efficiency offline flyback for LCD monitors and TVs FA5518: Enhanced quasi-resonant with frequency jitter for EMI reduction — LCD TV power supply FA5696: Integrated PFC + PWM controller — high-power LCD TV power supplies requiring power factor correction FA8A00: Advanced PWM with burst mode for ultra-low standby power — energy-efficient LCD power supply Offline Switcher ICs (Power Integrations TinySwitch-III) TNY285DG (SOP-7): Up to 5W, integrated 700V MOSFET, auto-restart protection — USB charger and low-power adapter repair Timer & Oscillator ICs NE555 / LM555: Astable oscillator and monostable timer, 4.5V–16V, 0.1Hz–500kHz — PWM generation, LED flashers, tone generators, delay timers Typical Failure Symptoms (LCD Power Board) Monitor completely dead — no power LED, no backlight Monitor makes ticking or clicking sound (SMPS auto-restart cycling) Monitor powers on briefly then shuts off Backlight flickers or dims under load Repair Workflow Identify the PWM controller IC on the power board (check part number against FA55xx or TNY series) Check for visible damage (burnt marks, swollen capacitors near the IC) Replace the PWM controller IC with the matching part number from this collection Also replace the primary-side electrolytic capaci