PMIC - AC DC Converters, Offline Switchers

Part Number	Description / PDF	Quantity
IW1818-00 Dialog Semiconductor	AC/DC CONTROLLER INT PWR BJT	0
NCP1361AABAYSNT1G	SWITCHING CONTROLLER	48000
FSQ311	SWITCHING REGULATOR	836087
UCC2808DTR-1 Texas Instruments	IC REG CTRLR ISO PWM CM 8-SOIC	0
NCP1247AD100R2G	SWITCHING CONTROLLER, CURRENT-MO	9459
STR4A164HD Sanken Electric Co., Ltd.	IC REG PWM CONV AC/DC 8-DIP	0
ICE2QR4780ZXKLA1 IR (Infineon Technologies)	AC-DC INTEGRATED POWER STAGE	40000
MC33363BDWG	SWITCHING REGLTR, VOLTAGE-MODE	2355
FSQ0565RWDTU	SWITCHING REGULATOR/CONTROLLER	289814
MC44603APG	SWITCHING CONTROLLER	2425
NCP1002PG	SWITCHING REGLTR, VOLTAGE-MODE	2168
MC33364D1G	SWITCHING CONTROLLER	188
ICE3A0565ZXKLA1 IR (Infineon Technologies)	IC OFFLINE CTRLR SMPS CM 7DIP	0
LYT4213E Power Integrations	IC LED DRIVER OFFL 2.72A ESIP-7C	0
BD7673AG-GTR ROHM Semiconductor	IC PWM DC/DC CONVERTER 6SSOP	2998
INN3268C-H208-TL Power Integrations	IC OFFLINE SWITCH SR CONTROL	0
LNK605PG Power Integrations	IC OFFLINE SWIT OTP CV/CC 8DIP	159
VIPER28LD STMicroelectronics	IC OFFLINE CONV PWM 800V 16SOIC	0
NCP1396BDR2G Sanyo Semiconductor/ON Semiconductor	IC REG CTRLR ISO PWM VM 16-SOIC	4081
MP174GJ-Z MPS (Monolithic Power Systems)	700V NON-ISOLATED OFF-LINE REGUL	1000

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