UCC2809DTR-1

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UCC2809DTR-1

IC OFFLINE SWITCH MULT TOP 8SOIC

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規格

Package Tape & Reel (TR),Cut Tape (CT)
ProductStatus Active
OutputIsolation Isolated
InternalSwitch(s) No
Topology Boost, Flyback, Forward
Voltage-StartUp 10 V
Voltage-Supply(Vcc/Vdd) 8V ~ 19V
DutyCycle 70%
Frequency-Switching 1MHz
ControlFeatures Frequency Control, Soft Start
OperatingTemperature -55°C ~ 150°C (TJ)
Package/Case 8-SOIC (0.154, 3.90mm Width)
SupplierDevicePackage 8-SOIC

概述

Description

UCC2809DTR-1 is a Texas Instruments high-voltage, fixed-frequency current-mode PWM controller for off-line switch‑mode power supplies, especially isolated flyback converters. It does not include the main power switch; an external MOSFET is used to make the primary switch.
Key points:
- Purpose: controls the switch current to regulate output in SMPS (flyback/topologies).
- Features: startup current from the high-voltage rail, primary current sensing for PWM, undervoltage lockout, overcurrent/short-circuit protection, thermal shut-down, soft-start and slope compensation for stable operation.
- Operation: fixed-frequency, current-mode control suitable for universal-input adapters and battery chargers.
- Packaging note: -DTR-1 indicates the Tape-and-Reel packaging variant of the device.
For exact electrical specs, pinout, recommended operating conditions, and reference designs, consult the TI UCC2809 datasheet and application notes.

Features

Key features of UCC2809DTR-1 (TI):
- Off-line flyback controller with primary-side regulation (PSR) for designs without optocoupler feedback.
- External MOSFET gate drive; high-voltage startup/bias network powers Vcc from bulk.
- Valley/current-mode PWM with slope compensation and fixed-frequency operation.
- RT pin to set switching frequency (typical tens of kHz range).
- Peak current limit for robust overload protection and short-circuit handling.
- Soft-start to reduce inrush and stress on the transformer.
- Protective functions: undervoltage lockout, overcurrent/short-circuit with latch and auto-restart (hiccup), and thermal shutdown.
- Wide input/line range suitable for rectified mains.
- Packaging: available in DTR-1 variant (UCC28xx family form factor).
Note: This is a concise summary of typical features for UCC2809 family devices. For exact electrical characteristics and pinout, refer to the current TI datasheet for UCC2809DTR-1.

Package

8-pin SOIC (D) package, shipped in Tape & Reel (TR).

Pinout

- Pin count: 8 pins (DTR package, e.g., SOIC-8/DIP-8).
- Function: High-voltage primary-side current-mode PWM controller for off-line flyback power supplies. Provides MOSFET gate drive, current-sense input, feedback/compensation, and protections (startup, undervoltage/overcurrent).

Manufacturer

- Manufacturer: Texas Instruments (TI).
- What kind of company: an American multinational corporation and one of the world's largest semiconductor manufacturers, specializing in analog and embedded processing integrated circuits.

Application

- Off-line isolated switch-mode power supplies (flyback) for universal-input AC-DC adapters and wall-warts
- LED driver applications with constant-current regulation
- Battery chargers and portable device power supplies
- Small telecom/industrial power supplies requiring high efficiency and low standby power

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