PMIC - AC DC Converters, Offline Switchers

Part Number	Description / PDF	Quantity
INN2024K-TL Power Integrations	IC OFFLINE SWITCH 20W 16ESOP	0
NCP1239ND65R2G Sanyo Semiconductor/ON Semiconductor	NCP1239F, 65KHZ	0
LNK501GN-TL Power Integrations	IC SWIT OCP CV/CC HV 8SMD	0
ICE3A3065PBKSA1 IR (Infineon Technologies)	SWITCHING REGULATOR	13000
TEA1733T/N1,118 NXP Semiconductors	IC CTLR SMPS SW MODE 8SOIC	17
TOP256MG Power Integrations	IC OFFLINE SWIT PROG OVP 10SDIP	0
LNK616GG-TL Power Integrations	IC OFFLINE SWIT CV/CC HV 8SMD	0
LT1738IG#TRPBF Analog Devices, Inc.	IC REG CTRLR PWM CM 20-SSOP	0
UCC2810DW Texas Instruments	IC REG CTRLR PWM CM 16-SOIC	393
MAX612CPA Analog Devices, Inc.	AC-TO-DC REGULATOR	0
NCP1340B7D1R2G Sanyo Semiconductor/ON Semiconductor	IC CTLR QUASI-RES 9SOIC	0
STR4A162S Sanken Electric Co., Ltd.	IC REG PWM CONV AC/DC 8-SOIC	0
LNK6666V Power Integrations	IC OFF-LINE SWITCH PWM 12DIP	1025
LT1738IG#PBF Analog Devices, Inc.	IC REG CTRLR PWM CM 20-SSOP	206
TOP257GN-TL Power Integrations	IC OFFLINE SWIT PROG OVP 8SMD	415
ICE3BS02G IR (Infineon Technologies)	SMPS CURRENT MODE CONTROLLER	7500
LNK6407D-TL Power Integrations	IC LINKSWITCH CV/CC 7.5W 8SOIC	0
STR-A6062H Sanken Electric Co., Ltd.	IC REG PWM CONV AC/DC 8-DIP	1512
ICE2A265FKLA1 IR (Infineon Technologies)	ICE2A265 - FIXED FREQUENCY COOLS	8833
VIPER012XSTR STMicroelectronics	IC OFFLINE CONV PWM 10SSOP	4958

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