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WT7185
The WT7185 is a high performance multi-mode (CCM/Valley Switching) Flyback PWM controller. It is specifically designed to work with USB PD controller to provide a total solution for USB PD or a programmable power adapter. It minimizes the components counts and is available in a tiny SOT-26 package. The controller operates in Continuous Current Mode (CCM) during heavy load and operates in discontinuous conduction mode with valley switching during light load. The WT7185 helps to improve the overall efficiency and optimize the product performance. The controller provides with important protection features, such as DC Brown In/Out, VDD OVP, CS OTP, OLP, OCP and Output Short Circuit Protection.
Features
- Peak Load Frequency Boost (130 kHz)
- Ultra-low Start-up Current (1.5uA Typ.)
- Optimized for Wide Output Voltage Operation (USB PD 2.0 & PD 3.0)
- Wide VDD Range: 7.5V to 85V (Typ.)
- Adaptive OCP Compensation with Adjustable Line Compensation
- Adaptive Green Mode Control
- No External VDD Linear Regulator Circuit
- Only One VDD Auxiliary Winding
- CCM/DCM/Valley-Switching Multi-Mode Operation
- Internal Soft-Start Function
- Protection:
- DC Brown In/Out Protection on VS Pin
- Output Over Voltage Protection (VS_OVP)
- VDD Over Voltage Protection (VDD_OVP)
- Open Loop Protection (OLP) when Feedback Loop Open
- Two Level Over Current Protection (OCP)
- External Over Temperature Protection Through a NTC (CS_OTP)
- Internal Over Temperature Protection
- CS Pin Open/Short Protection
- Output Rectifier Short Protection
- Green Package: SOT-26
- Peak Load Frequency Boost (130 kHz)
Application Circuit
Applications
Application Circuit
