The SG6846A is a highly integrated green-mode PWM controller that features low startup current (8µA), low operating current (3.7mA), peak-current mode of operation with cycle-by-cycle current limiting, PWM frequency continuously decreasing with burst mode at light loads, VDD over-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, two-level OCP delay (1600ms), output short-circuited delay time 100ms, programmable PWM frequency with frequency hopping, OCP threshold is half peak current limit, feedback open-loop protection with 1700ms delay, and built-in soft-start.
The SG6846A is a highly integrated PWM controller designed for switch-mode power supplies (SMPS) with surge-current output. It incorporates a two-level over-current protection (OCP) function and cycle-by-cycle current limiting to ensure safe operation. The device features a peak-current mode of operation with frequency hopping to reduce EMI emissions and a built-in soft-start function to minimize stress on the power MOSFET during startup.
| Startup Current | 8uA |
|---|---|
| Operating Current | 3.7mA |
| Operating Junction Temperature | -40 to +150 °C |
| Storage Temperature Range | -65 to +150 °C |
| Supply Voltage (Max) | 25 V |
| OVP Threshold Voltage | 22.6V to 24.6V |
| OCP Delay Time | 1600ms to 1800ms |
| Output Short-Circuited Delay Time | 90ms to 410ms |
| Maximum Duty Cycle | 80% to 90% |
It is designed for general-purpose switch-mode power supplies and flyback power converters, including power adapters and open-frame SMPS.
The typical switching frequency is 65kHz when using a 26kΩ resistor on the RI pin.