PMIC - AC DC Converters, Offline Switchers

Part Number	Description / PDF	Quantity
MAX17497AATE+ Maxim Integrated	IC OFF-LINE CONVERTER 16TQFN	345250
INN2605K Power Integrations	IC FLYBACK SWITCHER 25W 16ESOP	800
INN3168C-H109-TL Power Integrations	IC OFFLINE SWITCH SR CONTROL	0
NCP1050ST100T3G Sanyo Semiconductor/ON Semiconductor	IC CONV PWM UVLO HV SOT223-4	4000
UCC3580D-2 Texas Instruments	UCC3580 - SINGLE-ENDED ACTIVE CL	820
INN2604K-TL Power Integrations	IC FLYBACK SWITCHER 20W 16ESOP	0
ICE3BR4765JFKLA1 IR (Infineon Technologies)	IC OFFLINE CTRLR SMPS OTP 8DIP	1970
TOP258GN-TL Power Integrations	IC OFFLINE SWIT PROG OVP 8SMD	1203
FSL206MRN Sanyo Semiconductor/ON Semiconductor	IC PWM/SENSEFET SMPS 0.6A 8-DIP	2116
UCC3809DTR-2 Texas Instruments	UCC3809-2 ECONOMY PRIMARY SIDE C	7500
ISL6844IB Intersil (Renesas Electronics America)	SWITCHING CONTROLLER	4674
LNK500PN Power Integrations	IC SWIT OCP CV/CC HV 8DIP	0
LNK6428E Power Integrations	IC LINKSWITCH CV/CC 10W 7ESIP	0
UCC3809P-2 Texas Instruments	IC REG CTRLR PWM CM 8VSSOP	320
NCP1341A1D1R2G	QUASI-RESONANT CONTROLLER, HIGH-	5000
NCP1012APL100R2G Sanyo Denki SanUPS Products	MONOLITHIC SWITCHER	2000
FS6X0420RJ	SWITCHING REGULATOR	0
TOP258YN Power Integrations	IC OFFLINE SWIT PROG OVP TO220	1628
UCC3804NG4 Texas Instruments	IC REG CTRLR PWM CM 8DIP	0
UCC2808APWTR-1 Texas Instruments	SWITCHING CONTROLLER	19000

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