UCC38503DW

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UCC38503DW

IC PFC CTR AVERAGE 100KHZ 20SOIC

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規格

Package Tube
ProductStatus Active
Mode Average Current
Frequency-Switching 100kHz
Current-Startup 150 µA
Voltage-Supply 9.7V ~ 18V
OperatingTemperature 0°C ~ 70°C
MountingType Surface Mount
Package/Case 20-SOIC (0.295, 7.50mm Width)

概述

Description

The UCC38503DW is TI’s peak current‑mode PWM controller for switching power supplies. It is used to drive an external power MOSFET in non‑isolated or isolated SMPS topologies (e.g., buck, flyback, forward). Key points:
- External MOSFET driver with peak current‑mode control for efficient duty‑cycle regulation
- Built‑in protections: undervoltage lockout, overcurrent/short‑circuit protection, soft‑start
- Frequency set by an external resistor (RT) and suitable for compact designs
- Enable/disable control and simple compensation options
- RoHS-compliant DW package (8‑pin family package; suitable for compact PCBs)
Applications: off‑line or DC‑DC converters, telecom/industrial power supplies, LED drivers where a simple, robust controller is desired.
Note: The DW suffix indicates the package/reel option; always consult the latest TI datasheet for exact pinout, electrical specs, and typical application circuits.

Features

Here are the key features of TI UCC38503DW (concise):
- 8-pin DW package; primary-side current-mode PWM controller for flyback/off-line power supplies
- Direct rectified mains startup via integrated high-voltage startup current source
- Wide input range suitable for offline adapters
- Fixed-frequency PWM control with cycle-by-cycle peak current limit
- Soft-start to limit inrush and improve fault tolerance
- Protections: overcurrent (with latch/hiccup on fault), overvoltage, and thermal shutdown
- Undervoltage lockout (UVLO) with enable/shutdown input
- Low quiescent current for improved standby efficiency
- Suitable for high-efficiency designs; supports quasi-resonant/valley-switching approaches in appropriate topologies
- Minimal external components required for basic operation
Note: For exact electrical specs (turn-on times, voltage ranges, timing, fault behavior), refer to the UCC38503DW datasheet.

Package

UCC38503DW is in an 8‑pin surface-mount package (SOIC).

Pinout

Pin count: 8 pins (DW package, SOIC-8).
Function: High-voltage primary-side regulation PWM controller for flyback/off-line switching power supplies (SMPS).

Manufacturer

- Manufacturer: Texas Instruments Incorporated (TI).
- What kind of company: TI is an American multinational semiconductor company that designs and manufactures a broad range of integrated circuits and related products, with a strong focus on analog, mixed-signal, and embedded processing technologies. It’s one of the world’s largest semiconductor manufacturers.

Application

UCC38503DW is a primary-side regulation PWM controller for isolated flyback converters. Typical applications:
- Isolated offline power supplies (AC-DC adapters, wall-warts)
- Telecom, datacom, and industrial power modules
- Battery chargers and charging adapters
- Standby/low-power sections needing high efficiency with simple external components

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