Overview
The STCH03LTR, produced by STMicroelectronics, is an advanced offline PWM controller designed for low standby power adapters. It combines a high-performance low-voltage PWM controller chip and a 650V HV start-up cell in the same package. This controller is specifically tailored for offline quasi-resonant zero-voltage-switching (ZVS) flyback converters, offering advanced power management with ultra-low standby power consumption (under 10 mW at 230 VAC).
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| VHV (Voltage range) | -0.3 | - | 650 | V |
| IDD (Operating supply current) | 2.5 | 2.9 | - | mA |
| IDD-FAULT (Fault quiescent current) | 330 | 420 | - | μA |
| FLIM_MAX (Max. internal frequency limit) | - | - | 154 | kHz |
| TSTART (Starter period) | - | - | 220 | μs |
| TJ (Junction temperature range) | -40 | - | 150 | °C |
| TSTG (Storage temperature) | -55 | - | 150 | °C |
| VDD (Supply voltage) | - | - | Self-limited | V |
| VZCDH (Upper clamp voltage) | 2.7 | 3 | 3.5 | V |
| VZCDL (Lower clamp voltage) | -90 | -60 | -30 | mV |
Key Features
- Advanced power management for ultra-low standby power consumption (under 10 mW at 230 VAC)
- Fully integrated primary side constant current output regulation (CC)
- 650 V embedded HV start-up circuit with zero power consumption
- Quasi-resonant (QR) zero-voltage-switching (ZVS) operation
- Accurate and adjustable output overvoltage protection (OVP) with options for auto-restart or latched mode after fault
- Output undervoltage protection (UVP) with auto-restart
- Input voltage feedforward compensation for mains-independent CC regulation
- Embedded thermal shutdown
- Intelligent frequency jitter for EMI suppression
- Leading-edge blanking on the current sense input for greater noise immunity
Applications
- AC-DC chargers for smartphones, tablets, camcorders, and other handheld equipment
- AC/DC adapters for set-top boxes (STB), notebooks, and auxiliary power supplies
- Quick chargers
Q & A
- What is the typical standby power consumption of the STCH03?
The STCH03 has an ultra-low standby power consumption of under 10 mW at 230 VAC.
- What type of operation does the STCH03 support?
The STCH03 supports quasi-resonant (QR) zero-voltage-switching (ZVS) operation.
- What is the maximum voltage the HV start-up circuit can withstand?
The HV start-up circuit can withstand up to 650 V.
- Does the STCH03 have built-in thermal protection?
- What is the purpose of the input voltage feedforward compensation in the STCH03?
The input voltage feedforward compensation is used for mains-independent constant current (CC) regulation.
- How does the STCH03 reduce EMI?
The STCH03 uses intelligent frequency jittering to reduce EMI, which involves modulating the peak primary current at 9 kHz.
- What are the typical applications of the STCH03?
The STCH03 is used in AC-DC chargers, AC/DC adapters for STB and notebooks, and quick chargers.
- What is the maximum switching frequency of the STCH03?
The maximum switching frequency is top-limited below 154 kHz.
- Does the STCH03 support valley-skipping mode?
- What is the package type of the STCH03LTR?
The STCH03LTR is available in an SO8 package and also in tape and reel packaging.
