Overview
The STCH03L, produced by STMicroelectronics, is an advanced offline PWM controller designed for quasi-resonant zero-voltage-switching (ZVS) flyback converters. This controller is optimized for low standby power consumption and is particularly suited for applications requiring high efficiency and reliability. It integrates a high-performance low-voltage PWM controller chip and a 650V high-voltage start-up cell within the same package, enabling efficient and robust power management. The STCH03L supports both constant voltage (CV) and constant current (CC) output regulation, making it versatile for various power supply needs.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| High-Voltage Start-Up (HV) | - | 50 | - | V |
| Operating Supply Current (IDD) | 2.5 | 2.9 | - | mA |
| Fault Quiescent Current (IDD-FAULT) | 330 | 420 | - | μA |
| Maximum Switching Frequency (FLIM_MAX) | - | - | 154 | kHz |
| Soft-Start Duration (TSU) | 12 | 20 | 28 | ms |
| Operating Temperature Range | -40 | - | 150 | °C |
| Package Type | - | - | SO-8 | - |
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) using primary-sensing feedback.
- 650 V embedded high-voltage 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.
- Output undervoltage protection (UVP) with auto-restart.
- Input voltage feedforward compensation for mains-independent CC regulation.
- Embedded thermal shutdown and 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.
- USB power delivery fast chargers.
- Industrial and personal electronics requiring efficient and reliable power management.
Q & A
- What is the STCH03L designed for?
The STCH03L is designed for offline quasi-resonant zero-voltage-switching (ZVS) flyback converters, particularly for applications requiring low standby power consumption and high efficiency.
- What are the key features of the STCH03L?
The key features include advanced power management, fully integrated primary side constant current regulation, 650V high-voltage start-up circuit, quasi-resonant ZVS operation, and various protection mechanisms such as OVP, UVP, and OTP.
- What is the maximum switching frequency of the STCH03L?
The maximum switching frequency is top-limited below 154 kHz.
- How does the STCH03L manage low load conditions?
The device enters a controlled burst-mode operation at very light loads, which helps minimize residual input consumption and meets stringent power consumption standards.
- What types of protection does the STCH03L offer?
The STCH03L offers output overvoltage protection (OVP), output undervoltage protection (UVP), overtemperature protection (OTP), and hiccup-mode protection.
- What is the operating temperature range of the STCH03L?
The operating temperature range is from -40°C to 150°C.
- What package type is the STCH03L available in?
The STCH03L is available in an SO-8 package.
- How does the STCH03L achieve constant current regulation?
The STCH03L achieves constant current regulation using primary-sensing feedback, eliminating the need for dedicated current reference ICs and current sensors.
- What are some common applications of the STCH03L?
Common applications include AC-DC chargers, AC/DC adapters for STB and notebooks, and USB power delivery fast chargers.
- Does the STCH03L support both CV and CC regulation?
Yes, the STCH03L supports both constant voltage (CV) and constant current (CC) output regulation.
