PMIC - AC DC Converters, Offline Switchers

Part Number	Description / PDF	Quantity
TOP246GN-TL Power Integrations	IC OFFLINE SWIT OVP UVLO HV 8SMD	772
INN3677C-H601-TL Power Integrations	IC OFFLINE SWITCH SR CONTROL	1796
LNK3206GQ-TL Power Integrations	LINKSWITCH-TN2 750V 360MA	0
UCC28704DBVT-1 Texas Instruments	IC FLYBACK CTLR CVCC PSR SOT23-6	111
KA3882ED	SWITCHING CONTROLLER	570
INN3676C-H601-TL Power Integrations	IC OFFLINE SWITCH SR CONTROL	0
MC33364D2R2G	SWITCHING CONTROLLER	9154
NCP1071P065G	SWITCHING CONTROLLER, CURRENT-MO	22300
INN3379C-H302-TL Power Integrations	INNO3 PRO SIZE 9	2000
FSL206MRLX	FSL206MR - 650V INTEGRATED POWER	11787
L6566BH STMicroelectronics	IC CTLR PWM MULTIMODE SMPS 16SOI	220
RT7736GGE Richtek	IC OFFLINE CTRLR PWM	0
TOP269VG Power Integrations	IC OFFLINE SW PWM OCP OVP 12EDIP	0
NCP1219BD100R2G Sanyo Semiconductor/ON Semiconductor	IC PWM CTLR 100KHZ W/DSS 7SOIC	157500
LYT4313E Power Integrations	IC LED DRIVER OFFL DIM ESIP-7C	0
NCV1063AD060R2G Sanyo Semiconductor/ON Semiconductor	HV SWITCHER FOR LOW POWER	0
FSQ0370RLA Sanyo Semiconductor/ON Semiconductor	IC PWM/SENSEFET 700V 3A 8-LSOP	1485
VIPER25LD STMicroelectronics	IC OFFLINE CONV PWM OVP 16-SOIC	1982
FSQ0370RNA Sanyo Semiconductor/ON Semiconductor	IC SWIT PWM GREEN OVP UVLO 8DIP	2972
FSFR1800XSL Sanyo Semiconductor/ON Semiconductor	IC FPS PWR SWITCH 260W 9-SIPL	2991520

PMIC - AC DC Converters, Offline Switchers

1. Overview

AC-DC converters and offline switchers are critical subcategories of Power Management Integrated Circuits (PMICs) that convert alternating current (AC) from mains power to direct current (DC) for electronic devices. Offline switchers directly regulate input voltage without requiring a line-frequency transformer, enabling compact and efficient designs. These components are essential in modern electronics for ensuring stable power delivery, energy efficiency, and compliance with global standards like Energy Star and CoC Tier-2.

2. Main Types and Functional Classification

Type	Functional Features	Application Examples
Flyback Controllers	Isolated topology with energy storage in transformer; suitable for low-to-medium power	Mobile chargers, adapter supplies
Forward Controllers	Higher efficiency for medium-to-high power; requires reset circuitry	Industrial power supplies, telecom rectifiers
Resonant Controllers	ZVS/ZCS techniques for minimal switching losses; high-frequency operation	High-end server PSUs, wireless charging
PFC-Precursors	Boosts power factor to meet regulatory limits; often paired with main converters	Appliances, LED drivers

3. Structure and Components

Typical physical structure includes:

Package Types: DIP, SOP, QFN, or custom power packages
Internal Components:
- Power MOSFET/BJT switches
- PWM/PFM controllers
- Voltage/current feedback circuits
- Protection modules (OVP, OCP, OTP)
- High-voltage startup circuits

Technical composition integrates primary-side regulation (PSR) or secondary-side feedback with optocouplers, often supporting synchronous rectification for efficiency optimization.

4. Key Technical Parameters

Parameter	Description	Importance
Input Voltage Range	85-265V AC or 120-400V DC	Global compatibility and surge tolerance
Output Power	1W-500W depending on topology	Determines application scope
Switching Frequency	20kHz-2MHz	Affects EMI, transformer size, and efficiency
Efficiency	85%-96% (varies with load)	Thermal performance and energy costs
Protection Features	Overvoltage, overcurrent, thermal shutdown	System reliability and safety compliance

5. Application Fields

Consumer Electronics: Phone chargers, notebook adapters, smart home devices
Industrial: Automation equipment, PLCs, test instruments
Medical: Isolated power supplies for diagnostic equipment
Telecom: 48V rectifiers, base station power systems
Automotive: On-board chargers, vehicle AC-DC systems

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
Texas Instruments	UCC28780	High-frequency resonant controller with GaN support
STMicroelectronics	L6565	Current-mode flyback controller for adapters
Infineon	ICE3BR1765	Integrated CoolSET for SMPS
ON Semiconductor	NCP1342	Quasi-resonant flyback controller
Monolithic Power Systems	MP44010	Primary-side regulated controller

7. Selection Guidelines

Define input/output requirements (voltage, current, power)
Choose topology based on isolation needs and efficiency targets
Evaluate protection features for mission-critical applications
Consider package thermal performance (e.g., exposed pads)
Verify compliance with standards (UL, CE, FCC)
Balance cost vs. integration level (e.g., controller vs. digital PMIC)

Case Study: For a 65W USB-C laptop adapter, select a high-frequency resonant controller with synchronous rectification to achieve >92% efficiency and compact form factor.

8. Industry Trends

Integration: Combining PFC + LLC stages into single chips
Wide Bandgap: SiC/GaN FETs enabling >1MHz switching
Digital Control: Programmable PMICs with real-time optimization
Green Standards: Meeting EU CoC Tier-2 no-load <10mW requirements
AEC-Q Compliance: Growth in automotive-grade offline converters