PMIC - AC DC Converters, Offline Switchers

Part Number	Description / PDF	Quantity
INN3672C-H601-TL Power Integrations	IC OFFLINE SWITCH SR CONTROL	2045
NCP1011ST100T3G Sanyo Semiconductor/ON Semiconductor	IC CTRLR/MOSFET 100KHZ SOT223	876
FSFR1700USL	POWER SUPPLY SUPPORT CIRCUIT, FI	6384
TOP258EG Power Integrations	IC OFFLINE SWIT PROG OVP 7CESIP	0
FSQ500N	0.36A, 140KHZ PDIP8	34605
MAX5975AETE+T Analog Devices, Inc.	SWITCHING CONTROLLER	2500
BM2P013 ROHM Semiconductor	IC CONV DC/DC PWM 0.950MA 7DIP	1998
NCP1212P	SWITCHING CONTROLLER	0
TEA1721AT/N1,118 NXP Semiconductors	IC SMPS CTLR W/PWR SWITCH 7-SOIC	0
STR3A162HD Sanken Electric Co., Ltd.	IC PWM AC/DC CONVERTER 8DIP	10
ICE3RBR1765JZXKLA1 IR (Infineon Technologies)	IC PFC CONTROLLER CCM 7DIP	1969
UCC28221D Texas Instruments	UCC28221 DUAL INTERLEAVED PWM CO	16926
TOP249YN Power Integrations	IC OFFLINE SWIT UVLO HV TO220	773
KA5L0565RYDTU	SWITCHING REGULATOR, CURRENT-MOD	70000
MP156GJ-Z MPS (Monolithic Power Systems)	IC REG BUCK	1526
NCP1070STAT3G Sanyo Semiconductor/ON Semiconductor	IC REG SWITCHING HV SMPS SOT223	4995
NCP1051P44	SWITCHING REGLTR, VOLTAGE-MODE	0
UCC3808APW-1	SWITCHING CONTROLLER	1500
AP3302AEV1 Zetex Semiconductors (Diodes Inc.)	ACDC SINGLE ENDED CONT	0
LNK3202D-TL Power Integrations	IC OFFLN CONV MULT TOP 8SO	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