STMicroelectronics SRK2000DTR

Overview

SRK2000DTR from STMicroelectronics is a secondary-side synchronous rectifier smart driver IC optimized for LLC resonant converters with center-tapped transformer secondaries. It features dual N-channel MOSFET gate drivers (1 A source / 3.5 A sink), programmable drain-sensing turn-off thresholds (–12 mV or –25 mV), intelligent automatic sleep mode, and operates from 4.5 V to 32 V at up to 500 kHz - enabling high-efficiency AC-DC power supplies in server SMPS and 80+/85+ ATX designs.

For engineers reviewing the SRK2000DTR datasheet, SRK2000DTR pinout, SRK2000DTR application, or SRK2000DTR equivalent, key selection considerations include its interlocked dual-gate control logic, current-reversal protection, light-load sleep mode activation threshold, UVLO hysteresis configuration via EN pin, and SO-8 package thermal performance under pulsed gate drive loads.

Technical Context

The SRK2000DTR implements a cycle-by-cycle, drain-voltage-sensing control scheme where each gate driver responds independently to negative-going edges on DVS1/DVS2 pins, with precise timing windows governed by internal state machines. Its interlocking logic enforces strict non-overlap between GD1 and GD2 outputs and enables zero-voltage turn-on by triggering conduction only after body-diode conduction begins.

It integrates programmable UVLO hysteresis (via EN pin biasing), adaptive sleep mode entry/exit based on load-dependent quiescent current reduction (250 µA active, 150 µA sleep), and robust noise rejection using 250 ns turn-on debounce and 60 ns max turn-off propagation delay - all designed to maintain ZVS operation across wide load and frequency ranges in resonant topologies.

Key Specifications

Pinout & Package

SRK2000DTR is housed in an SO-8 package with exposed thermal pad (standard JEDEC MS-012AC), supporting PCB heat sinking for continuous 0.65 W dissipation at T_A = 50 °C (R_thJA = 150 °C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous rectifier controller applications.

Compared with UCC24612DR and MP6908GJ-Z, SRK2000DTR uniquely delivers hardware-enforced dual-channel interlock, programmable turn-off thresholds, and automatic light-load sleep - making it the only choice for high-efficiency, high-reliability center-tap LLC designs above 200 W where ZVS integrity and standby power are critical.

Availability

SRK2000DTR is available at Aetrix Electronics and suitable for high-efficiency server SMPS, 80+/85+ ATX power supplies, and industrial AC-DC adapters requiring stable component supply and long-term lifecycle support.

Supply support for SRK2000DTR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

The SRK2000 belongs to ST's high-performance power conversion IC portfolio, engineered specifically for resonant topologies - emphasizing precision timing, robust protection, and efficiency optimization in LLC and phase-shifted full-bridge secondary-side control.

FAQ

What is the purpose of the EN pin on the SRK2000DTR?

The EN pin serves three integrated functions: it sets the drain-voltage turn-off threshold (–12 mV or –25 mV) for both synchronous rectifiers, programs the UVLO hysteresis for VCC startup/shutdown, and acts as a remote enable/disable input. Biasing it with a pull-up resistor or divider configures all three behaviors simultaneously - no external logic is needed for coordinated control.

How does the SRK2000DTR prevent simultaneous conduction of the two MOSFETs?

It uses dedicated hardware interlock logic that monitors both DVS1 and DVS2 states in real time. The gate drivers GD1 and GD2 are mutually exclusive: one output cannot activate until the other has fully turned off and its drain voltage exceeds +1.4 V (arming threshold). This hardwired constraint guarantees <1 ns overlap risk and eliminates need for external dead-time circuitry.

Can the SRK2000DTR be used with standard-level (non-logic) N-channel MOSFETs?

Yes - its gate drivers clamp high-level output to ~12 V (even with 32 V VCC), making them compatible with standard-threshold N-MOSFETs. The 3.5 A sink current ensures fast turn-off critical for preventing current reversal, and the programmable turn-off threshold allows tuning for higher R_DS(on) devices without sacrificing ZVS performance.

Does the SRK2000DTR require external components for basic operation?

Only three passive components are mandatory: a 0.1 µF ceramic capacitor from VCC to SGND, another 0.1 µF from VCC to PGND, and a pull-up or divider network on the EN pin. No external timing capacitors, bootstrap diodes, or auxiliary windings are needed - enabling minimal BOM count and simplified layout in space-constrained power modules.