PMIC - AC DC Converters, Offline Switchers

Part Number	Description / PDF	Quantity
LNK305DG-TL Power Integrations	IC OFFLINE SWIT OCP 8SOIC	1317
UCC2813DTR-4G4 Texas Instruments	IC REG CTRLR BST FLYBK PWM 8SOIC	0
LNK623DG Power Integrations	IC OFFLINE SWIT OTP OCP CV 8SOP	0
UCC3808AD-1G4 Texas Instruments	IC REG CTRLR PWM CM 8-SOIC	0
UCC2808AQDR-1Q1 Texas Instruments	UCC2808A-2 LOW-POWER CURRENT-MOD	800
NCP1053P136	SWITCHING REGLTR, VOLTAGE-MODE	1150
INN3377C-H301-TL Power Integrations	45 W (85-265 VAC) 725V	1724
MC44608P75	SWITCHING CONTROLLER	0
INN3268C-H209-TL Power Integrations	IC OFFLINE SWITCH SR CONTROL	1262
FSD176MRTLDTU	3.85A, 73KHZ SWITCHING FREQ-MAX	42088
FT838NB2-RT Fremont Micro Devices	IC OFFLINE CTRLR CC/CV 8SOP	2180
NCV1072P065G Sanyo Semiconductor/ON Semiconductor	IC REG SWITCHER HV 8PDIP	0
NCP1216D133R2G Sanyo Semiconductor/ON Semiconductor	IC CTRLR PWM CM OTP HV 8SOIC	24952500
NCP1203P100G	SWITCHING CONTROLLER	140818
AP3987CTS7-13 Zetex Semiconductors (Diodes Inc.)	ACDC PSR SWITCHER SO-7	4000
FSQ0765RSLDTU	SWITCHING REGULATOR/CONTROLLER	73137
UCC28722DBVT Texas Instruments	IC REG CTRLR FLYBK ISO SOT23-6	3243
LNK304DN-TL Power Integrations	IC OFFLINE SWIT OCP 8SOIC	17080
ISL8842AAUZ-T Intersil (Renesas Electronics America)	IC REG CTRLR PWM CM 8MSOP	0
UCC2808N-1 Texas Instruments	UCC2808-1 LOW POWER CURRENT MODE	7028

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