ST8123 36W Flyback Controller
Specifications
PowerMax. 36W (up to 40W with heatsink)
Standby Power Consumption<100mW (at 220V input)
Control ModeHigh-Performance Current-Mode PWM
Frequency60/67.5/75kHz (typ. 67.5kHz)
Power Device CharacteristicsIntegrated 650V/7A power MOSFET; BVdss=650V; Ron≤1.4Ω; ID=7A
CharacteristicsUltra-low startup current (5µA), audio-noise-free operation, green-mode at light load, frequency shuffling for EMI, over-power compensation, leading-edge blanking, slope compensation, OCP/OLP/UVLO/OVP/OTP protection, for PD fast chargers
PackageDIP8
Product details
Overview
The ST8123 is a high-performance current-mode PWM controller with an integrated 650V/7A power MOSFET. It delivers up to 36W output power over a wide input voltage range of 85V-265V (up to 40W with a heatsink). With an ultra-low startup current of 5µA and automatic green-mode entry at light loads, the ST8123 achieves standby power consumption of less than 100mW at 220V input. The device also minimizes operation in the audible frequency range below 20kHz to ensure no audible noise, and integrated frequency shuffling simplifies EMI design. Comprehensive protection functions including OCP, OLP, UVLO, OVP and OTP ensure reliable system operation.
Features
- Ultra-low startup current (5µA typ.)
- Audio-noise reduction function
- Green mode at light load
- Frequency shuffling for improved EMI
- Over-power compensation
- Leading-edge blanking (LEB)
- Slope compensation
- Comprehensive protection: OCP, OLP, UVLO, OVP, OTP
Typical Applications
- Adapters
- Set-top boxes (STB)
- Open-frame power supplies
- PD fast chargers
