SY5020AFVP

SY5020A is a high frequency QR Flyback controller targeting at PD adaptors and fast charges. It is suitable for wide output voltage range application, with maximum 240W output power. Maximum switching frequency can be up to 500kHz, so size of transformer and capacitors can be reduced. In normal QR Flyback solutions, valley number always jumps between 1 - 2 or 3 - 5, which will increase Vo ripple and bring audio niose. SY5020A can lock valley with proprietary circuit and valley number can be 1 to 6th. System state is more stable than normal QR solutions. SY5020A works under peak current mode. It adopts QR mode and MOSFET can be turned on at valley to reduce switching loss, especially under high input voltage. If load decreases more, SY5020A will enter DCM to reduce switching frequency for higher efficiency. If load is very light, SY5020A will enter burst mode to reduce power loss.

Applications

• AC-DC Adaptors
• PD Adaptors
• Quick Chargers

Key features

• SY5020A also provides comprehensive and reliable functions including HV startup, X-cap discharge, brown in/out protection, output OVP and UVP, OLP, VCC OVP, internal and external OTP, etc.
• SY5239 is recommended to be used as secondary side SR controller in conjunction with SY5020A. Then ZV operation can be achieved for higher efficiency.
• SY5020A is available with SSOP9.
• DCM + QR Combined Operating Mode
• Adaptive OCP (LPS, Limited Power Source)
• Programmable Gate Driver Current
• Patent Drive Technology for Higher Efficiency
• Valley Lockout from 1 to 6th
• Low Frequency Burst (1kHz)
• Noise Internal Soft Start
• Integrated 700V HV Start up
• Brown In/Out Protection
• X-cap Discharge Protection
• Programmable Output OVP&UVP
• Current Sense Resistor Short Protection
• Internal & External OTP
• Compact Package: SSOP9