Overview
The SRK2000A, produced by STMicroelectronics, is a synchronous rectifier smart driver specifically designed for secondary-side synchronous rectification in LLC (Linker-Lee-Chen) resonant converters. This IC is optimized for use in high-efficiency power conversion applications, particularly those requiring precise control over synchronous rectifier MOSFETs. The SRK2000A integrates advanced features such as protection against current reversal, safe management of load transient, light load, and startup conditions, and an intelligent automatic sleep mode to enhance efficiency at light loads.
Key Specifications
| Parameter | Test Condition | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Supply Voltage (VCC) | Operating range | 4.5 | - | 32 | V |
| Turn-on Threshold (VCCOn) | - | 4.25 | 4.5 | 4.75 | V |
| Turn-off Threshold (VCCOff) | - | 4 | 4.25 | 4.5 | V |
| Quiescent Current (Iq) | After turn-on | - | 250 | 500 | µA |
| Operating Frequency | - | - | - | 500 kHz | - |
| Gate Driver Output Current | Source/Sink | - | - | 1 A / 3.5 A | - |
| Package | - | - | - | SO-8 | - |
Key Features
- Secondary side synchronous rectifier controller optimized for LLC resonant converters.
- Protection against current reversal.
- Safe management of load transient, light load, and startup conditions.
- Matched turn-off thresholds for synchronous rectifier MOSFETs.
- Intelligent automatic sleep mode at light load to improve efficiency.
- Dual gate driver for N-channel MOSFETs with 1 A source and 3.5 A sink drive current.
- Programmable UVLO (Under Voltage Lock Out) with hysteresis.
- Low quiescent consumption of 250 µA.
- Operating frequency up to 500 kHz.
- Low external component count required.
Applications
- All-in-one PC power supplies.
- High-power AC-DC adapters.
- 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 SRK2000A?
The SRK2000A is a synchronous rectifier smart driver designed for secondary-side synchronous rectification in LLC resonant converters.
- What are the key features of the SRK2000A?
Key features include protection against current reversal, safe management of load transient and startup conditions, matched turn-off thresholds, and an intelligent automatic sleep mode.
- What is the operating voltage range of the SRK2000A?
The operating voltage range is from 4.5 V to 32 V.
- What is the quiescent current consumption of the SRK2000A?
The quiescent current consumption is 250 µA after turn-on.
- What is the maximum operating frequency of the SRK2000A?
The maximum operating frequency is up to 500 kHz.
- How does the SRK2000A manage light load conditions?
The SRK2000A enters an intelligent automatic sleep mode at light load to improve efficiency by stopping gate driving and reducing quiescent consumption.
- What type of gate drivers does the SRK2000A provide?
The SRK2000A provides dual gate drivers for N-channel MOSFETs with 1 A source and 3.5 A sink drive current.
- What is the package type of the SRK2000A?
The SRK2000A is available in an SO-8 package.
- What are some typical applications of the SRK2000A?
Typical applications include all-in-one PC power supplies, high-power AC-DC adapters, 80+/85+ compliant ATX SMPS, 90+/92+ compliant server SMPS, and industrial SMPS.
- How does the SRK2000A prevent simultaneous conduction of the synchronous rectifier MOSFETs?
The SRK2000A uses interlocking logic to prevent both gate drivers from being switched on at the same time, ensuring that only one MOSFET is conducting in each cycle.
