Cxac8557 includes high-precision constant voltage, constant current primary side controller and power MOSFET, which are used for charger and LED lighting with high performance and simplified peripheral components. Cxac8557 works in the original edge detection and adjustment mode, and optocoupler and TL431 can be omitted. The chip provides a very comprehensive self recovery protection function, including cycle by cycle over-current protection, over-voltage protection, open-loop protection, over temperature protection, output short circuit protection and CS open / short circuit protection. The built-in high voltage start circuit and low chip power consumption make it able to meet the high standby power standard. In constant current mode, current and output power can be adjusted by RS resistance of CS pin; in constant voltage mode, PFM mode can obtain high performance and efficiency
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[ CXAC8557 ]"
目录
产品概述 返回TOP
CXAC8557包括高精度的恒压、恒流原边控制器及功率MOSFET，用于高性能、外围元器件精简的 充电器和LED照明。CXAC8557工作在原边检测和调整模式，可省略光耦和TL431。该芯片提供了极为全面 的自恢复保护功能，包含逐周期过流保护、过压保护、开环保护、过温保护、输出短路保护和CS开/短 路保护等。内置高压启动电路和极低的芯片功耗使得能够满足较高的待机功耗标准。在恒流模式，电流 和输出功率可通过CS脚的Rs电阻进行调节；在恒压模式，PFM工作模式可获得较高的性能和效率。轻载 时，该芯片采用较小的峰值电流工作以减小音频噪声。另外，输出线补偿功能有助于获得较好的负载调 整率。
产品特点 返回TOP
?内置650V高雪崩能力的功率MOSFET
?全电压输入范围±5% 的电压调整率
?原边反馈和调节可省光耦和TL431
?恒压和恒流可调
?输出线补偿功能
?内置原边电感量补偿电路
?内置高压启动电路
?优异全面的保护功能
?过温保护 (OTP)
?VDD欠压锁定 (UVLO)
?逐周期过流保护 (OCP)
?开环保护 (OLP)
?VDD过压保护 (OVP)
?CS开/短路保护
?安全自动恢复
应用范围 返回TOP
?LED照明
?开关电源电池充电器
技术规格书（产品PDF) 返回TOP
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产品封装图 返回TOP
电路原理图 返回TOP
相关芯片选择指南 返回TOP
| AC-DC(PSR)原边反馈PSR交直流转换器 | ||||||||
| Product | Standby Power | SW Voltage | VDD Operation Voltage | Output Power | CC/CV Precision | Frequency | Package | Note |
| CXAC8556 | 0~650V | <50mW | 13Ω | 9~26V | 5W | ±3% | SOP8 | Charger/LED |
| CXAC8557 | 0~650V | <50mW | 8Ω | 9~26V | 6W | ±3% | SOP8 | Charger/LED |
| CXAC8558 | 0~650V | <50mW | 4.5Ω | 9~26V | 8W | ±3% | SOP7 | Charger/LED |
| CXAC8559 | 0~650V | <50mW | 3.6Ω | 9~26V | 12W | ±3% | DIP8/SOP7 | Charger/LED |
| CXAC8560 | 0~650V | <50mW | 2.5Ω | 9~26V | 15W | ±3% | DIP8/SOP7 | Charger/LED |
| CXAC8561 | 0~650V | <30mW | 18Ω | 9~30V | 6W | ±3% | SOP7 | SOP7 |
| CXAC8562 | 0~650V | <30mW | 4.5Ω | 9~30V | 8W | ±3% | SOP7 | Charger/Adaptor |
| CXAC8563 | 0~650V | <30mW | 2.5Ω | 9~30V | 18W | ±3% | DIP8/SOP7 | Charger/Adaptor |
| CXAC8564 | 0~800V | <30mW | 2.5Ω | 9~30V | 15W | ±3% | DIP8 | Charger/Adaptor |
| CXAC8565 | 0~650V | <30mW | 1.6Ω | 9~30V | 18W | ±3% | DIP8 | Charger/Adaptor |
| Product | Driver | Standby Power | Start-up Current | VDD Operation Voltage | Output Power | CC/CV precision | Package | Note |
| CXAC8566 | BJT | <50mW | 5uA | 8~26V | <15W | ±5% | SOT23-6 | Charger/LED |
| CXAC8567 | MOS | <100mW | 5uA | 10~26V | <15W | ±5% | SOT23-6 | Charger/LED |
| CXAC8568 | BJT | <100mW | 5uA | 8~26V | <15W | ±5% | SOT23-5 | Charger/LED |
| CXAC8569 | MOS | <100mW | 5uA | 8~26V | <15W | ±5% | SOT23-6 | Charger/LED |
