SG5842A/SG5842JA is a highly integrated green-mode PWM controller. It features low startup current, low operating current, programmable PWM frequency with hopping (SG5842JA), peak-current-mode control, cycle-by-cycle current limiting, synchronized slope compensation, leading-edge blanking (LEB), constant output power limit, totem-pole output with soft driving, VDD over-voltage protection (OVP), programmable over-temperature protection (OTP), internal latch circuit (OTP, OVP), internal open-loop protection, and VDD under-voltage lockout (UVLO). It is suitable for general-purpose switch-mode power supplies and flyback power converters, including notebook power adapters and open-frame SMPS.
The SG5842A/JA series of PWM controllers is designed to enhance the performance of flyback power converters by minimizing standby power consumption through a proprietary green-mode function. This feature provides off-time modulation to continuously decrease switching frequency at light-load conditions while avoiding acoustic noise issues with a minimum PWM frequency set above 22KHz.
| Low Startup Current | 14uA |
|---|---|
| Low Operating Current | 4mA |
| Operating Junction Temperature Range | -40 to +125 °C |
| Vop Over-Voltage Protection Threshold | 23.2 to 25.2 V |
| Green-Mode Minimum Frequency | 18 to 25 KHz |
| Maximum Duty Cycle | 70 % |
It is used in general-purpose switch-mode power supplies and flyback power converters, including notebook power adapters and open-frame SMPS.
Yes, the SG5842JA integrates a frequency-hopping function that helps reduce EMI emission of a power supply with minimum line filters.
The totem-pole output driver for the power MOSFET is internally clamped below 18V.