UC3865DW

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UC3865DW

IC OFFLINE SW MULT TOP 16SOIC

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規格

Package Tube
ProductStatus Active
OutputIsolation Non-Isolated
InternalSwitch(s) Yes
Topology Full-Bridge, Half-Bridge, Push-Pull
Voltage-StartUp 16.5 V
Voltage-Supply(Vcc/Vdd) 10.5V ~ 22V
Frequency-Switching 10kHz ~ 1MHz
ControlFeatures Soft Start
OperatingTemperature 0°C ~ 70°C (TA)
Package/Case 16-SOIC (0.295, 7.50mm Width)
SupplierDevicePackage 16-SOIC

概述

Description

UC3865DW is a PWM controller IC for switch‑mode power supplies. It’s part of the UC3865 family and is used to drive an external power MOSFET in SMPS topologies (flyback, forward, buck). It provides current‑mode control with protections and feedback handling suitable for isolated or non‑isolated converters.
Key features (typical):
- Fixed or adjustable oscillator frequency for PWM drive
- Cycle‑by‑cycle current limit and slope compensation
- Soft‑start and undervoltage lockout
- Enable/shutdown input
- Feedback via opto‑coupler for isolated regulation
The DW suffix denotes a specific packaging option (surface‑mount) and may imply a lead‑free variant; check the datasheet for exact pinout and package details.
Common applications: wall adapters, computer/telecom SMPS, DC‑DC regulators, LED drivers.
Note: For exact electrical specs, recommended external components, and pinout, consult the UC3865DW datasheet.

Features

UC3865DW is a high-voltage, current‑mode PWM controller for offline switch‑mode power supplies (flyback/forward). Key features:
- External MOSFET drive; high-voltage startup current source; Vcc regulation from auxiliary winding.
- Fixed/frequency operation with RT-programmable frequency (typical 25–65 kHz).
- Current‑mode control with slope compensation.
- Soft-start to limit inrush and reduce EMI.
- Overcurrent/short‑circuit protection with latch (fault) and auto‑restart.
- Undervoltage lockout (UVLO) and thermal shutdown protection.
- Lightweight 8‑pin DW package suitable for compact SMPS designs.
Typical applications: offline adapters, LED drivers, and other low-to-medium power SMPS. Note: refer to the datasheet for exact pinout, performance specs, and protection behavior.

Package

UC3865DW comes in a 16‑pin surface‑mount package: SOIC-16, package code DW (wide‑body).

Pinout

- Pin count: 16 pins
- Function: UC3865DW is a PWM controller IC for switch-mode power supplies (SMPS). It provides a reference, error amplifier, oscillator and PWM control to regulate duty cycle and drive an external power switch (MOSFET/BJT), with protections such as current limit, undervoltage lockout, and soft-start.

Manufacturer

Manufacturer: Texas Instruments (TI). TI is a multinational semiconductor company that designs and manufactures analog and embedded processing integrated circuits for a wide range of industries (consumer electronics, automotive, industrial, communications).

Application

Application areas of UC3865DW:
- Switching-mode power supplies (offline AC-DC and DC-DC) using flyback, buck, or boost topologies
- LED driver circuits (constant-current backlights/lighting)
- Battery charging circuits
- Telecom and industrial power adapters and other SMPS designs

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