PMIC - AC DC Converters, Offline Switchers

Part Number	Description / PDF	Quantity
LNK564DG Power Integrations	IC OFFLINE SWIT OTP HV 8SOP	556
LM5021MM-1/NOPB Texas Instruments	IC PWM CTRLR AC-DC CURR 8VSSOP	922
INN3464C-TL Power Integrations	INNOSWITCH3-MX 650V 18W	1995
LT3798EMSE#TRPBF Analog Devices, Inc.	IC FLYBACK CTLR W/PFC 16-MSOP	1
UCC2813N-4 Texas Instruments	UCC2813 - LOW POWER ECONOMY BICM	13888
VIPER53DIP-E STMicroelectronics	IC OFFLINE SWIT PWM CM OTP 8DIP	134834000
UCC3895NG4 Texas Instruments	IC REG CTRLR PWM CM/VM 20DIP	0
ICE5QR4770AGXUMA1 IR (Infineon Technologies)	ICE5QR4770 - QUASI RESONANT COOL	2211
NCP1013ST100T3G Sanyo Semiconductor/ON Semiconductor	IC OFFLINE SWIT SMPS CM SOT223	2742
ICE2B0565 IR (Infineon Technologies)	SWITCHING REGULATOR	20000
FSFM300N Sanyo Semiconductor/ON Semiconductor	IC SWIT PWM GREEN CM UVLO 8DIP	513
NCP1014AP065G Sanyo Semiconductor/ON Semiconductor	IC OFFLINE SWIT SMPS CM OVP 7DIP	290
L6668TR STMicroelectronics	IC CTRLR PWM PROG CM HV 16SOIC	0
UCC25701NG4	UCC25701 ADVANCED VOLTAGE MODE P	50
NCP1239BD65R2G Sanyo Semiconductor/ON Semiconductor	IC CURR MODE CTLR 65KHZ 7SOIC	0
TOP253PN Power Integrations	IC OFFLINE SWIT PROG OVP 8DIP	1343
STR-A6131 Sanken Electric Co., Ltd.	IC REG PRC FLYBACK SW 8DIP	0
ICE2QR0665XKLA1 IR (Infineon Technologies)	IC CTRLR SMPS QUASI-RESON 8DIP	1957
FS8S0765RCBYDTU	SWITCHING REGULATOR	109781
AP3125HAKTR-G1 Zetex Semiconductors (Diodes Inc.)	IC PWM CTLR CURR MODE SOT26	1820

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