Overview
The STCH03 is an offline current-mode controller designed by STMicroelectronics for use in quasi-resonant zero-voltage-switching (ZVS) flyback converters. This controller combines a high-performance low-voltage PWM controller chip and a 650V high-voltage start-up cell within the same package. It is specifically tailored for applications requiring advanced power management, particularly in low standby power consumption scenarios, such as adapters for smartphones, tablets, and other handheld devices. The STCH03 achieves constant output voltage (CV) regulation through secondary side feedback and provides constant output current regulation (CC) using primary-sensing feedback, eliminating the need for dedicated current reference ICs and current sensors.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Input Voltage Range | - | - | 230 VAC | V |
| Standby Power Consumption | - | - | 10 mW | mW |
| Embedded HV Start-up Voltage | - | - | 650 V | V |
| Maximum Switching Frequency | - | - | 154 kHz | kHz |
| OVP Threshold | 2.375 | 2.5 | 2.625 | V |
| UVP Threshold | 0.522 | 0.55 | 0.578 | V |
| Package Type | - | - | SO8 | - |
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 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.
Applications
- AC-DC chargers for smartphones, tablets, camcorders, and other handheld equipment.
- Adapters for set-top boxes (STB), notebooks, and auxiliary power supplies.
- USB power delivery fast chargers.
- LED drivers, such as those used in street lighting applications.
Q & A
- What is the STCH03 designed for? The STCH03 is designed for offline quasi-resonant zero-voltage-switching (ZVS) flyback converters, particularly for applications requiring low standby power consumption.
- What are the key features of the STCH03? Key features include advanced power management, fully integrated primary side constant current output regulation, 650 V embedded HV start-up circuit, quasi-resonant ZVS operation, and various protection mechanisms such as OVP and UVP.
- What is the maximum switching frequency of the STCH03? The maximum switching frequency is top-limited below 154 kHz.
- How does the STCH03 achieve constant output current regulation? The STCH03 achieves constant output current regulation using primary-sensing feedback, eliminating the need for dedicated current reference ICs and current sensors.
- What are the typical applications of the STCH03? Typical applications include AC-DC chargers for handheld devices, adapters for STB and notebooks, USB power delivery fast chargers, and LED drivers.
- What kind of package does the STCH03 come in? The STCH03 comes in an SO8 package.
- Does the STCH03 have thermal protection? Yes, the STCH03 has embedded thermal shutdown protection.
- How does the STCH03 manage EMI? The STCH03 uses intelligent frequency jitter for EMI suppression.
- What is the standby power consumption of the STCH03? The standby power consumption is under 10 mW at 230 VAC.
- Does the STCH03 support burst-mode operation? Yes, the STCH03 enters a controlled burst-mode operation at very light loads to minimize residual input consumption).
