SG6742MRSY
高度集成绿色模式PWM控制器 Highly Integrated Green-Mode PWM Controller
Description
The highly integrated SG6742ML/MR PWM controller provides several features to enhance the performance of flyback converters.
To minimize standby power consumption, a proprietary green-mode function provides off-time modulation to linearly decrease the switching frequency at light-load conditions. To avoid acoustic-noise problems, the minimum PWM frequency is set above 22KHz. The green-mode function enables the power supply to meet international power conservation requirements. With the internal high-voltage startup circuitry, the power loss due to bleeding resistors is also eliminated. To further reduce power consumption, SG6742ML/MR is manufactured using the BiCMOS process, which allows an operating current of only 2.7mA.
Features
High-Voltage Startup
Low Operating Current: 2.7mA
Linearly Decreasing PWM Frequency to 22KHz
Frequency Hopping to Reduce EMI Emission
Fixed PWM Frequency: 65KHz
Peak-Current-Mode Control
Cycle-by-Cycle Current Limiting
Leading-Edge Blanking
Synchronized Slope Compensation
Internal Open-Loop Protection
GATE Output Maximum Voltage Clamp: 18V
VDDUnder-Voltage Lockout UVLO
VDDOver-Voltage Protection OVP
Programmable Over-Temperature Protection OTP
Internal Latch Circuit OVP, OTP
Internal Sense Short-Circuit Protection
Build-in 5ms Soft-Start Function
Constant Power Limit Full AC Input Range
Internal OTP Sensor with Hysteresis
Applications
General-purpose switch-mode power supplies and flyback power converters, including:
Power Adapters
Open-Frame SMPS
