UC3843N TI PWM Controller | 8-PDIP | 8.4V-30V Input, 275kHz Max Freq

Product Overview

The UC3843N from Texas Instruments is a high-performance fixed-frequency current-mode PWM controller designed for off-line and DC-to-DC converter applications. It features a trimmed oscillator for precise duty cycle control, a temperature-compensated reference, and a high-gain error amplifier. The device operates at a switching frequency up to 275 kHz and includes under-voltage lockout with hysteresis, a low startup current of 0.5 mA, and a totem-pole output stage capable of driving power MOSFETs directly. Housed in an 8-pin PDIP package, the UC3843N is optimized for low-power and medium-power converter designs requiring minimal external components.

Detailed Technical Specifications

Key Features

• Optimized for off-line and DC-to-DC converters
• Low startup current (< 1 mA)
• Automatic feed-forward compensation
• Pulse-by-pulse current limiting
• Under-voltage lockout with hysteresis
• Double pulse suppression
• High-current totem-pole output
• Internally trimmed bandgap reference

Target Applications

• AC-DC adapters and chargers
• DC-DC converters for telecom and networking equipment (e.g., 5G base station power supplies)
• Industrial power supplies
• Battery chargers
• LED lighting drivers
• Automotive electronics (e.g., dashboard power modules)

Global Supply Chain & Wholesale Solutions

At Jasin Chip, we provide professional supply chain and wholesale solutions for UC3843N. Our core advantages include:

• 24/7 Global Customer Support: Professional team providing instant quotes and technical support worldwide.
• In-stock Inventory, Same-day Shipping: We maintain localized stock; orders confirmed before 4 PM are shipped the same day.
• HK-SZ Synergy, Flexible Settlement: Direct global shipping from Shenzhen with support for HK bank transfers and multi-currency.
• Escrow Secured Transactions: We support Escrow.com for secure transactions, ensuring peace of mind for batch orders.
• BOM Kitting & Sampling Services: Specialized sourcing for testing samples and urgent shortage components.

Quality Assurance & Compliance

Jasin Chip guarantees that all delivered products are 100% original factory stock with full quality assurance and traceability.

• 100% Original & Authentic: All components are guaranteed to be authentic with strict quality control.
• RoHS Compliant: All electronic components comply with international environmental and safety standards.
• Original Factory Packaging: We maintain original factory packaging and seals to ensure ESD protection and physical integrity.

產品概述

UC3843N 是德州儀器（TI）推出的一款高性能固定頻率電流模式 PWM 控制器，專為離線式和 DC-DC 轉換器應用設計。它包含一個精確的振盪器用於佔空比控制、溫度補償參考電壓以及高增益誤差放大器。該器件工作頻率高達 275 kHz，具有滯後欠壓鎖定、0.5 mA 的低啟動電流以及可直接驅動功率 MOSFET 的推挽輸出級。UC3843N 採用 8 引腳 PDIP 封裝，針對需要最少外部元件的低功率和中功率轉換器設計進行了優化。

詳細技術參數

核心特性

• 針對離線式和 DC-DC 轉換器優化
• 低啟動電流（< 1 mA）
• 自動前饋補償
• 逐脈衝電流限制
• 滯後欠壓鎖定
• 雙脈衝抑制
• 大電流推挽輸出
• 內部微調帶隙參考

典型應用場景

• AC-DC 適配器和充電器
• 電信和網絡設備的 DC-DC 轉換器（例如 5G 基站電源）
• 工業電源
• 電池充電器
• LED 照明驅動器
• 汽車電子（例如儀表板電源模塊）

環球供應鏈與批發合作夥伴方案

在 Jasin Chip，我們為 UC3843N 提供全面的供應鏈與批發解決方案。 我們的核心優勢包括：

• 全天候環球客戶支援：專業團隊為您提供即時報價及技術支援，無需漫長等待。
• 現貨庫存，即日發貨：確保現貨充足。下午 4 點前確認訂單，即可安排當天寄出。
• 深港聯動，結算靈活：深圳直發全球，物流高效可靠；支援香港銀行戶口轉賬及多幣種結算。
• Escrow 擔保交易：支援 Escrow.com 平台交易，保障買賣雙方權益，小批量訂單亦可安心在線下單。
• BOM 配單與樣板服務：提供樣板測試及認證支援。專注一站式 BOM 配套及緊急缺料採購服務。

品質保證與合規

Jasin Chip 承諾所有出貨產品均為原廠正貨，具備完善的品質保證及產品可追溯性。

• 100% 原廠正貨：承諾所有供應零件均為原裝現貨，品質嚴格把關，來源清晰可追溯。
• 符合 RoHS 認證：所有電子元器件均符合國際環保標準及相關安全認證。
• 原廠封裝保護：嚴格保留原廠原始包裝及封條，確保物流過程中的靜電防護 (ESD) 與物理安全。

以上產品均為原廠正貨，提供 BOM 配單及現貨庫存支援，歡迎查詢。

HONG KONG JASIN SEMICONDUCTOR TECHNOLOGY COMPANY LIMITED
Trusted Partner for Automotive, Industrial, and Hard-to-find Components.
WhatsApp: +852 5209 9691 | Email: [email protected]