PMIC - AC DC Converters, Offline Switchers

Part Number	Description / PDF	Quantity
NCP1050P100	SWITCHING REGLTR, VOLTAGE-MODE	105800
ISL6842IRZ-T Intersil (Renesas Electronics America)	SWITCHING CONTROLLER	6000
NCP1050P44	SWITCHING REGLTR, VOLTAGE-MODE	3000
NCP1230P65G Sanyo Semiconductor/ON Semiconductor	IC CTRLR PWM SMPS OVP OCP 7DIP	23141150
FSQ0265RL	SWITCHING REGULATOR	2795
NCP1071P100G Sanyo Semiconductor/ON Semiconductor	IC REG SW 700V SMPS 8DIP	0
MAX17498BATE+T Maxim Integrated	IC OFF-LINE CONVERTER 16TQFN	2197
SG3844M Roving Networks / Microchip Technology	IC REG CTRLR ISO CM 8-DIP	61
NCP1015AP065G Sanyo Semiconductor/ON Semiconductor	IC OFFLINE SWIT SMPS CM 7DIP	683
UCC2810NG4 Texas Instruments	IC REG CTRLR BST FLYBK ISO 16DIP	0
MIC38HC44YM-TR Roving Networks / Microchip Technology	IC REG CTRLR PWM CM 8SOIC	2490
NCP1377DR2	SWITCHING CONTROLLER	6923
NCP1239DD65R2G Sanyo Semiconductor/ON Semiconductor	IC REG CTRLR FLYBK ISO CM 7SOIC	0
UC3823DWG4	UC3823 HIGH SPEED PWM CONTROLLER	680
STR-A6131M Sanken Electric Co., Ltd.	IC REG PRC FLYBACK SW 8DIP	0
STR-A6062HD Sanken Electric Co., Ltd.	IC REG PWM CONV AC/DC 8-DIP	33
INN3268C-H210-TL Power Integrations	IC OFFLINE SWITCH SR CONTROL	0
NCP1027P065G Sanyo Semiconductor/ON Semiconductor	IC SWIT PWM PROG CM OVP HV 7DIP	1547
LNK362DG-TL Power Integrations	IC OFFLINE SWIT HV 8SOP	2000
MP171GJ-P MPS (Monolithic Power Systems)	UNIVERSAL INPUT, NON-ISOLATED OF	0

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