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 FAIRCHILD
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January 2010 © 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN6862R/L • Rev. 1.0.0 FAN6862R / FAN6862L Highly Integrated Green-Mode PWM Controller Features Low Startup Current: 8µA Low Operating Current in Green Mode: 3mA Peak-Current-Mode Operation with Cycle-by-Cycle Current Limiting PWM Frequency Continuously Decreasing with Burst Mode at Light Loads VDD Over-Voltage Protection (OVP) Constant Output Power Limit (Full AC Input Range) Over-Temperature Protection (OTP) Fixed PWM Frequency (65KHz) with Frequency Hopping Feedback Open-Loop Protection with 56ms Delay Soft Start Time: 5ms 400mA Driving Capability Applications General-purpose switch-mode power supplies and flyback power converters, including: Power Adapters Open-Frame SMPS SMPS with Surge-Current Output, such as for Printers, Scanners, and Motor Drivers Description A highly integrated PWM controller, FAN6862R/L provides several features to enhance the performance of flyback converters. To minimize standby power consumption, a proprietary green-mode function provides off-time modulation to continuously decrease the switching frequency under light-load conditions. Under zero-load conditions, the power supply enters burst mode, which completely shuts off PWM output. Output restarts just before the supply voltage drops below the UVLO lower limit. This green-mode function enables power supplies to meet international power conservation requirements. The FAN6862R/L is designed for SMPS and integrates a frequency-hopping function that helps reduce EMI emission of a power supply with minimum line filters. The built-in synchronized slope compensation is proprietary sawtooth compensation for constant output power limit over universal AC input range. The gate output is clamped at 18V to protect the external MOSFET from over-voltage damage. Other protection functions include VDD over-voltage protection, over-temperature protection, and overload protection. For over-temperature protection, an external NTC thermistor can be applied to sense the ambient temperature. When OVP, OTP, or OLP is activated, an internal protection circuit switches off the controller. Part Number OVP OTP OLP FAN6862RTY Auto Restart Auto Restart Auto Restart FAN6862LTY Latch Latch Latch Ordering Information Part Number Operating Temperature Range Eco Status Package Packing Method FAN6862RTY -40 to +105°C Green 6-Pin SSOT-6 Tape & Reel FAN6862LTY -40 to +105°C Green 6-Pin SSOT-6 Tape & Reel For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html. |
