LNK562PN

LNK562PN is an offline switcher IC from Power Integrations’ LinkSwitch family. It integrates a high-voltage (≈650 V) MOSFET with a primary-side PWM controller for isolated flyback power supplies.
Key points:
- Integrated HV MOSFET, startup/bias circuitry, and current-mode control.
- Designed for low‑cost, high-efficiency flyback converters in off-line adapters and chargers.
- Features protections (overcurrent/short-circuit, thermal) and typically very low standby power.
- Often supports primary-side regulation (PSR) to reduce or eliminate opto-isolators, with minimal external components required.
- Packaging variants (Pb-free) with standard through-hole or surface-mount options.
Applications:
- Small power supplies and phone/tablet chargers, LED drivers, wall-wart adapters (roughly a few watts up to tens of watts, depending on transformer design).
How it works:
- In an isolated flyback, the IC turns the primary MOSFET ON to store energy in the transformer; when OFF, energy transfers to the secondary and is regulated by adjusting duty cycle/frequency to meet the output requirements.

LNK562PN (Power Integrations) typical features:
- Integrated high-voltage MOSFET (≈700V) for offline operation
- Primary-side regulation (PSR) with no optocoupler feedback
- Fixed-frequency flyback control with valley-switching for higher efficiency
- Internal protections: current limit, overcurrent/short-circuit protection, thermal shutdown
- Overvoltage protection
- Universal input range: 85–265 VAC (single-ended, offline)
- Low standby/no-load power consumption
- Minimal external components required (simple, compact offline adapters/chargers)
- 8-pin package (SOP/DIP-style) suitable for compact power supplies
Note: exact frequency and performance can vary by variant; this summary reflects typical LNK562PN capabilities within the LinkSwitch family.

8-pin DIP (DIP-8) package; Pb-free (RoHS-compliant).

- Pin count: 8 pins (DIP-8/SO-8 package).
- Function: LNK562PN is an integrated offline switcher (LinkSwitch) with a high-voltage MOSFET and control circuitry for isolated flyback power supplies. It drives the transformer primary through the Drain, is powered from Vcc (startup/aux winding), and uses GND, FB (feedback) and CS/IS (current sense) pins for regulation and protection.

Power Integrations. It is a semiconductor company that designs and sells energy-efficient power-management ICs, specializing in high-voltage switch-mode power supplies for off-line power adapters and related applications.

Typical applications: low-power offline isolated flyback power supplies. Used in AC-DC wall adapters and USB chargers for mobile devices, battery chargers for portable equipment, auxiliary power supplies for consumer electronics (set-top boxes, routers), and low-power LED driver applications.

Equivalent devices within Power Integrations’ LinkSwitch family:
- LNK362PN
- LNK364PN
- LNK365PN
- LNK366PN
- LNK367PN
- LNK368PN
They share similar pinout, high-voltage startup, and integrated MOSFET with primary-side regulation. There isn’t a formal cross-vendor one-to-one replacement; verify specs (output, Vds, package) or consult PI’s cross-reference for exact substitute.