SG5841SZ

Product Summary

The SG5841SZ is a PWM controller. The device provides several features to enhance the performance of flyback converters. The SG5841SZ is suitable for General-purpose, switch-mode, power supplies and flyback power converters, including Power Adapters and Open-Frame SMPS. The SG5841SZ provides many protections. In addition to cycle-by-cycle current limiting, the internal open-loop protection circuit ensures safety should an open-loop or output-short-circuit failure occur. PWM output is disabled until VDD drops below the UVLO lower limit, then the controller restarts. An external NTC thermistor can be applied for over-temperature protection. The SG5841SZ is available in an 8-pin DIP or SOP package.

Parametrics

SG5841SZ absolute maximum ratings: (1)VDD, Supply Voltage: 30 V; (2)VIN, Input Terminal: 30 V; (3)VFB, Input Voltage to FB Pin: -0.3 to 7.0 V; (4)VSENSE, Input Voltage to SENSE Pin: -0.3 to 7.0 V; (5)VRT, Input Voltage to RT Pin: -0.3 to 7.0 V; (6)VRI, Input Voltage to RI Pin: -0.3 to 7.0 V; (7)PD, Power Dissipation (TA < 50℃): 800mW; (8)θJA, Thermal Resistance (Junction-to-Air): 82.5℃/W; (9)θJC Thermal Resistance (Junction-to-Case): 59.7℃/W; (10)TJ, Operating Junction Temperature: -40 to +125℃; (11)TSTG, Storage Temperature Range: -55 to +150℃; (12)TL, Lead Temperature (Wave Soldering or Infrared, 10 Seconds): 260℃; (13)ESD, Human Body Model: 3 kV.

Features

SG5841SZ features: (1)Green-Mode PWM Controller; (2)Low Startup Current : 14μA; (3)Low Operating Current: 4mA; (4)Programmable PWM Frequency with Hopping; (5)Peak-Current-Mode Control; (6)Cycle-by-Cycle Current Limiting; (7)Synchronized Slope Compensation; (8)Leading-Edge Blanking (LEB); (9)Constant Output Power Limit; (10)Totem Pole Output with Soft Driving; (11)VDD Over-Voltage Clamping; (12)Programmable Over-Temperature Protection (OTP); (13)Internal Open-Loop Protection; (14)VDD Under-Voltage Lockout (UVLO); (15)GATE Output Maximum Voltage Clamp:18V.

Diagrams