AT3273
AT3273 is Current Mode PWM Controller manufactured by ATC.
Description
AT3273 is a highly integrated current mode PWM control IC optimized for high performance low standby power offline flyback converter applications.
To meet the international power conservation requirements, optimized green mode is integrated to improve the efficiency at light or no load conditions with no audible noise.
Slope pensation is integrated to ensure the stability at high load. Lead edge blanking is integrated to prevent the false trigger at the transition of the switch. Soft switching control at the gate drive can improve the EMI performance of the power supply. The Gate-drive output is clamped at 12V to protect the power MOS.
Features
- Frequency jitter function to improve EMI performance of power supply
- No-audible-noise green mode Control
- Multi operation mode: Fixed-frequency CCM, green mode and burst mode.
- Internal Slope pensation
- Low VDD Startup Current and Low Operating Current
- Leading Edge Blanking
- UVLO
- Gate Max Output Voltage Clamp at 12V
- Overload Protection (OLP).
- Over temperature Protection (OTP).
- Line pensation Over Current Protection (OCP)
Applications
Offline AC/DC flyback converter for
- Battery Charger
- Power Adaptor
- Set-Top Box Power Supplies
- Open-frame SMPS
- PC 5V Standby Power
TECHNOLOGY
Pin Assignments
S6 Package (SOT23-6)
GND FB RT
GATE
SENSE
Figure 1. Pin Assignment of ATC3273 for SOT23-6
Ordering Information
.73 Y WW
Production Cycle Vintage
TECHNOLOGY
Typical Application Circuit
Figure2. Typical Application Circuit of...
