MP183 250mA Zero Standby Buck Regulator TSOT23

MP183 250mA Zero Standby Buck Regulator TSOT23

The MP183 is a primary-side regulator that provides accurate constant voltage (CV) regulation without an optocoupler.

Key Specifications

Features

• Constant Voltage (CV) Control Supports Buck, Buck-Boost, and Flyback Topologies
• Integrated 700V, 17.5Ω MOSFET
• Internal High-Voltage (HV) Current Source
• Externally Adjustable, or Internally Fixed 12V Output
• Improved Electromagnetic Interference (EMI) Performance
• <3mW No-Load Consumption at 265VAC and 5V Output
• Anti-Audible Operation with Burst Mode
• Frequency Foldback
• Thermal Shutdown (TSD), VCC Under- Voltage Lockout (UVLO), Brown-In (B/I), Open-Loop Detection (OLD), Overload Protection (OLP), and Short-Circuit Protection (SCP)
• Available in TSOT23-5 and SOIC-8 Packages

Typical Application Circuit

Applications

• Internet of Things (IoT) Power Supplies, Including Non-Neutral Applications
• Non-Isolated Modules

Design Notes

• The PFC inductor must support the maximum duty cycle at the lowest line voltage, which is where saturation risk peaks.
• High-voltage startup and X-capacitor discharge paths dominate no-load standby loss; verify them against the efficiency target.
• Leakage inductance and the RCD clamp set the turn-off loss — snubber values are a thermal trade-off, not a fixed recipe.
• Synchronous rectification timing must track the primary switching; a mistimed SR FET conducts through its body diode and fails hot.

Common Questions