SG6841SZ

Product Summary

This highly integrated PWM controller SG6841SZ provides several features to enhance the performance of low power flyback converters. To minimize standby power consumption of the SG6841SZ, the proprietary green-mode function provides off-time modulation to linearly decrease the switching frequency under light-load conditions. This green-mode function of the SG6841SZ assists the power supply to easily meet the power conservation requirement. Due to BiCMOS process, the start-up current and operation current is reduced to 30uA and 3mA, respectively, to improve power conversion efficiency. Large start-up resistance of the SG6841SZ can be used for further power saving. Built-in synchronized slope compensation ensures the stability of peak current mode control. A proprietary internal compensation of the SG6841SZ ensures constant output power limit for universal AC input voltage from 90VAC to 264VAC.

Parametrics

SG6841SZ absolute maximum ratings: (1)VDD DC Supply Voltage: 30V; (2)Zener clamp: 32V; (3)Zener current: 10mA; (4)IOUT Gate Output Current: 500 mA; (5)VFB Input Voltage to FB Pin: -0.3 to 7V V; (6)VSense Input Voltage to SENSE Pin: -0.3 to 7V ; (7)VRT Input Voltage to RT Pin: -0.3 to 7V ; (8)VRI Input Voltage to Ri Pin: -0.3 to 7V ; (9)PD Power Dissipation: 1 W; (10)RΘ j-a Thermal Resistance Junction-air DIP: 82.5℃/W; (11)SOP: 141; (12)TJ Operating Junction Temperature: 150 ℃; (13)TA Operating Ambient Temperature: -30 to 85 ℃; (14)Tstg Storage Temperature Range: -55 to +150 ℃; (15)ESD Capability, HBM model: 3.0 kV; (16)ESD Capability, Machine model: 250 V.

Features

SG6841SZ features: (1)Green-mode PWM to support "Blue Angel" Norm; (2)Low start up current 30uA; (3)Low operation current 3mA; (4)Leading-edge blanking; (5)Built-in synchronized slope compensation; (6)Constant output power limit for universal AC input; (7)Current mode operation; (8)Cycle-by-cycle current limiting; (9)Under voltage lockout (UVLO); (10)Programmable PWM frequency; (11)GATE output maximum voltage clamped at 18V; (12)Totem pole output includes soft driving for better EMI; (13)Build-in limited-power-control to meet safety requirement; (14)Programmable over-temperature protection; (15)Few external components & low cost solution.

Diagrams