Overview
The SRK2001ATR is an adaptive synchronous rectification controller designed by STMicroelectronics, optimized for use in LLC resonant converters. This controller is specifically tailored for secondary side synchronous rectification, utilizing a transformer with a center tap secondary winding for full wave rectification. It provides advanced features such as dual gate drivers for N-channel MOSFETs, adaptive turn-off logic, and low consumption modes, making it highly efficient and versatile for various power management applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| VCC Operating Voltage Range | 4.5 to 32 | V |
| Operating Frequency | Up to 500 kHz | |
| Quiescent Current (Low Consumption Mode) | 50 μA | |
| Gate Driver Output Source Peak Current | -0.35 A | |
| Gate Driver Output Sink Peak Current (ZCD_OFF Comparator Triggered) | 4 A | |
| Rise Time | 140 ns | |
| Fall Time (Adaptive Turn-off Comparator) | 80 ns | |
| Junction Temperature Operating Range | -40 to 150 °C | |
| Storage Temperature | -55 to 150 °C | |
| Package | SSOP10 |
Key Features
- Dual gate drivers for N-channel MOSFETs, each capable of directly driving the MOSFETs.
- Adaptive turn-off logic and turn-on logic with adaptive masking time to maximize SR MOSFET conduction time.
- Auto-compensation of parasitic inductance, eliminating the need for external compensation circuits.
- High voltage drain-to-source Kelvin sensing for each SR MOSFET.
- Low consumption mode with a quiescent current of 50 μA, suitable for light-load and no-load conditions.
- Programmable exit load levels from burst-mode operation.
- EN pin with remote on/off function and internal pull-up.
- High-level voltage clamping to avoid excessive gate charge delivery.
Applications
- AC-DC adapters.
- All-in-one PC power supplies.
- High-end flat panel TVs.
- 80+/85+ compliant ATX SMPS (Switch-Mode Power Supplies).
- 90+/92+ compliant SERVER SMPS.
- Industrial SMPS.
Q & A
- What is the primary function of the SRK2001ATR?
The SRK2001ATR is an adaptive synchronous rectification controller optimized for secondary side synchronous rectification in LLC resonant converters.
- What is the operating voltage range of the SRK2001ATR?
The SRK2001ATR operates within a voltage range of 4.5 V to 32 V.
- What is the maximum operating frequency of the SRK2001ATR?
The SRK2001ATR can operate up to a frequency of 500 kHz.
- How does the SRK2001ATR manage low consumption modes?
The SRK2001ATR enters a low consumption mode with a quiescent current of 50 μA, either through the EN pin remote on/off function or by detecting primary controller burst-mode operation.
- What is the purpose of the adaptive turn-off logic in the SRK2001ATR?
The adaptive turn-off logic helps in limiting the current peak during gate drive transition and does not require any resistor in series to the SR MOSFET gates.
- How does the SRK2001ATR handle burst-mode exiting?
The SRK2001ATR allows programmable exit load levels from burst-mode operation through the PROG pin, which sets the conduction duty-cycle based on an internal lookup table.
- What are the key applications of the SRK2001ATR?
The SRK2001ATR is used in AC-DC adapters, all-in-one PC power supplies, high-end flat panel TVs, and various compliant SMPS systems.
- What is the package type of the SRK2001ATR?
The SRK2001ATR is packaged in an SSOP10 package.
- How does the SRK2001ATR ensure proper turn-on and turn-off of the SR MOSFETs?
The SRK2001ATR uses adaptive masking delay and interlock logic to ensure proper turn-on and turn-off of the SR MOSFETs, preventing simultaneous conduction.
- What are the thermal characteristics of the SRK2001ATR?
The SRK2001ATR has a junction temperature operating range of -40 to 150 °C and a storage temperature range of -55 to 150 °C.
