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The RT7781S is a high-performance current mode PWM controller featuring Richtek’s proprietary PowerZero technology. The PowerZero offers an excellent green power solution, particularly under light-load and no-load conditions. The integrated high-voltage device enables a fast start-up function without the need for external start-up resistors. Additionally, It includes brown-in and brown-out detection.The RT7781S provides comprehensive protection functions, including internal Over-Temperature Protection (OTP) and VDD Overvoltage Protection (OVP). It also features Secondary Rectifier Short-Circuit Protection (SRSP) and Current Sensing pin (CS) open-circuit protection. These protections simplify and enhance the reliability of power supply unit designs.The recommended junction temperature range is -40°C to 125°C, and the ambient temperature range is -40°C to 85°C.
PowerZero Technology - Integrated 700V Start-Up Device - Brown-In and Brown-Out Detection
Low No-Load Input Power (<50mW)
Driver Capability: 400mA/-400mA
ACD Pin for TV Applications
Frequency Jittering Function
Soft Driving for Reducing EMI Noise
VDD Overvoltage Protection
Internal Over-Temperature Protection
Secondary Rectifier Short-Circuit Protection
CS Pin Open-Circuit Protection
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