LNK562PN

Introduction to LNK562PN:
- It’s a Power Integrations LinkSwitch off-line switcher IC with an integrated high-voltage MOSFET, designed for compact flyback power supplies.
- Package: small 8-pin device used in low- to mid-power adapters and chargers.
Key features:
- Wide input range and primary-side regulation (PSR)—no opto-isolator needed.
- Cycle-by-cycle current limit plus fault protection (short-circuit/hiccup behavior).
- Low standby power and EMI-friendly operation with frequency jitter.
Typical applications:
- AC-DC wall adapters, USB chargers, and LED driver supplies in the ~5–20 W range.
How it works:
- Operates in a flyback topology. When the internal MOSFET turns on, energy is stored in the transformer; when it turns off, energy is delivered to the secondary.
- Regulation is achieved primarily via sensing on the primary side (auxiliary winding for Vcc) without external feedback.
Design notes:
- Requires a suitable transformer design for PSR, plus appropriate creepage/clearance and safety considerations. See the datasheet for exact pinout, electrical specs, and application circuit.

LNK562PN Features (concise):
- Integrated high-voltage MOSFET (700V) for offline operation
- Primary-side regulation (PSR) – no opto-isolator needed
- Fixed-frequency flyback controller for simple, compact designs
- Very low standby power; high overall efficiency
- Internal startup bias and current-limit circuitry
- Built-in protections: over-current/short-circuit, over-temperature, and protection watchdog
- OVP (over-voltage protection) and reliable fault handling
- Minimal external components; suitable for isolated power supplies in the 1–6 W range
- 8-pin package (LNK562PN) designed for low component count and cost-effective designs
Note: This summarizes typical features of the LNK562PN in the LinkSwitch family; check datasheet for exact electrical specs and recommended operating conditions.

- Pin count: 8 pins (8-pin package, SOP/DIP style).
- Function: LNK562PN is an offline flyback switch with an integrated high‑voltage MOSFET (LinkSwitch). It provides primary-side regulation for isolated power supplies.
- Key pin roles (typical):
- DRAIN: High-voltage input to the internal MOSFET
- SOURCE: MOSFET return/ground (reference)
- VCC: Supply for the controller
- FB: Feedback input for regulation (from optocoupler or primary-side regulation)
- Other pins are typically not connected (NC) or internally tied; no external gate pin is exposed.

- Manufacturer: Power Integrations, Inc.
- What kind of company: A semiconductor company specializing in high-voltage switch-mode power supply ICs for AC‑DC power supplies (off‑line controller families like LinkSwitch).

LNK562PN is used for off-line isolated flyback power supplies in low- to mid-power ranges. Common application areas include:
- AC-DC adapters and wall/USB chargers for phones, tablets, and small devices
- LED lighting drivers (mid-power, constant-current or constant-voltage)
- Standby and auxiliary power for consumer electronics (set-top boxes, modems, audio/video gear)
- Battery charger circuits for portable devices
- Small appliances and light industrial control power supplies
These chips are designed for universal input and high efficiency in compact, cost-sensitive power supplies.

8-pin DIP package (through-hole) – DIP-8. Pb-free variant available.