High Performance Quasi-Resonant PWM Controller
Description
High Performance Quasi-Resonant PWM Controller
OB2201
Product Specification
GENERAL DESCRIPTION
OB2201 is a high performance flyback QuasiResonant (QR) controller optimized to achieve high efficiency in the universal input range and full loading range with effective system cost.
At full loading, the IC operates in fix frequency (52KHz) CCM mode in the low line input range and operates in QR mode in high line input range.
In this way, high efficiency in the universal input range at full loading can be achieved.
At normal load condition, it operates in QR mode.
To minimize switching loss, the maximum switching frequency in QR mode is internally limited to 90 KHz.
When the loading goes low, it operates in PFM mode for high power conversion efficiency.
When the load is very small, the IC operates in ‘Extended Burst Mode’ to minimize the standby power loss.
As a result, high conversion efficiency can be achieved in the whole loading range.
OB2201 offers comprehensive protection coverage including Cycle-by-Cycle Current Limiting (OCP), VCC Under Voltage Lockout (UVLO), Output Over Voltage Protection (OVP), Over Temperature Protection (OTP), Over Load Protection (OLP), VCC Over Voltage Protection (VCC OVP), VCC Clamp, and Gate Clamp.
OB2201 also features protections against pin open and short conditions on selected pins.
OB2201 is offered in SOP-8 and DIP-8 packages.
FEATURES
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Multi-Mode Operation: • At Full Loading, Fix Frequency (52KHz) CCM Operation @ Low Line and QR Mode Operation @ High Line Input • Quasi-Resonant Operation at Normal Load • Pulse Frequency Modulation (PFM) Operation at Light Load • Burst Mode at No Load Adaptive Frequency Shuffling and Slope Compensation @ Fix Frequency CCM Mode Programmable OTP with latch Shutdown Fixed 4ms Soft-start 2.
5us Minimum Off Time 12.
5us Maximum On Time Limit 55us Maximum Off Time Limit 90KHz Maximum Frequency Limit Internal Leading Edge Blanking Output Over Voltage Protection 800mA Peak Current S...
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