SG6846BCSZ Datasheet PDF - Fairchild

●Description

●The highly integrated PWM controller, SG6846B, provides several features to enhance the performance of fly-back 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. This completely shuts off PWM output. 

●Features

●  Low Startup Current: 8µA

●  Low Operating Current: 3.7mA

●  Peak-Current Mode Operation with Cycle-by-cycle Current Limiting

●  PWM Frequency Continuously Decreasing with Burst Mode at Light Loads

●  VDDOver Voltage Protection (OVP)

●  AC Input Brownout Protection with Hysteresis

●  Constant Output Power Limit (Full AC Input Range)

●  Internal Latch Circuit for OVP, OTP, and OCP (BLSY, BLSZ)

●  Two-level OCP Delay with 200ms

●  Programmable PWM Frequency with Frequency Hopping

●  OCP Threshold is 2/3 Peak Current Limit

●  Soft Startup Time: 5ms

●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, Motor Drivers