【產品特性】‧Supports the “Blue Angel” Standard
‧ Low Start-up Current (10uA)
‧ Low Operating Current (2.5mA)
‧Constant Output Power Limit
‧ Universal Input
‧ Built-in Synchronized Slope Compensation
‧ Current Mode Operation
‧Cycle-by-cycle Current Limiting
‧Under Voltage Lockout (UVLO)
‧ Programmable PWM Frequency
‧Gate Output Voltage Clamped at 17V
‧Low Cost Green-Mode PWM Controller for Flyback Converters
‧SG6858TZ SOP-26 (Lead Free)
‧SG6858DZ DIP-8 (Lead Free)
‧Replacements for linear transformers and RCC
‧5V standby power for PC power supply.
【文字介紹】This highly integrated PWM controller provides several special enhancements designed to meet the low standby-power needs of low-power SMPS. To minimize standby power consumption, the proprietary green-mode function provides off-time modulation to linearly decrease the switching frequency under light-load conditions. This green-mode function enables the power supply to easily meet even the strictest power conservation requirements.
The BiCMOS fabrication process enables reducing the start-up current to 10uA, and the operating current to 2.5mA. To further improve power conservation, a large start-up resistance can be used. Built-in synchronized slope compensation ensures the stability of peak current mode control. Proprietary internal compensation provides a constant output power limit over a universal AC input range (90VAC to 264VAC). Pulse-by-pulse current limiting ensures safe operation even during short-circuits.
To protect the external power MOSFET from being damaged by supply over voltage, the SG6858’s output driver is clamped at 17V. SG6858 controllers can be used to improve the performance and reduce the production cost of power supplies. The SG6858 is the best choice for replacing linear and RCC-mode power adapters. It is available in 8-pin DIP and 6-pin SOT-26 packages.