(Hong Kong)
Product Summary
The OB2268 is a highly integrated current mode PWM control IC optimized for high performance, low standby power and cost effective offline flyback converter applications. PWM switching frequency at normal operation is externally programmable and trimmed to tight range. At no load or light load condition, the IC operates in extended ‘burst mode’ to minimize switching loss. Lower standby power and higher conversion efficiency is thus achieved. The applications of the OB2268 include Laptop Power Adaptor, PC/TV/Set-Top Box Power Supplies, Open-frame SMPS, Battery Charger.
Parametrics
OB2268 absolute maximum ratings: (1)Maximum Voltage Clamp: 18V; (2)Low Operating Current: 2.3mA; (3)Low VIN/VDD Startup Current: 6.5uA.
Features
OB2268 features: (1)Extended Burst Mode Control For Improved Efficiency and Minimum Standby Power Design; (2)Audio Noise Free Operation; (3)External Programmable PWM Switching Frequency; (4)Internal Synchronized Slope Compensation; (5)Low VIN/VDD Startup Current(6.5uA) and Low Operating Current (2.3mA); (6)Leading Edge Blanking on Current Sense Input; (7)Complete Protection Coverage With Auto Self-Recovery, External Programmable Over Temperature Protection (OTP); With or Without On-chip VDD OVP for System OVP; Under Voltage Lockout with Hysteresis (UVLO); Gate Output Maximum Voltage Clamp (18V), Line Compensated Cycle-by-Cycle Overcurrent Threshold Setting For Constant Output Current Limiting Over Universal Input Voltage; (8)Range (OCP); Over Load Protection (OLP).
Diagrams
