STMicroelectronics L6590ED013TR

Overview

L6590ED013TR from STMicroelectronics is a monolithic off-line switching regulator IC with integrated 700 V lateral power MOSFET, designed for flyback, boost, and forward AC-DC converters delivering up to 15 W. It features a 65 kHz (±10%) internal oscillator, 2.5 V ±2% precision reference, and standby mode reducing frequency to 22 kHz at light load. Used in wall plug adapters and auxiliary supplies for CRT/LCD monitors and desktop PCs.

For engineers reviewing the L6590ED013TR datasheet, L6590ED013TR pinout, L6590ED013TR application, or L6590ED013TR equivalent, key selection criteria include integrated high-voltage start-up, cycle-by-cycle overcurrent protection, latched overvoltage shutdown, brownout detection (SMD only), and thermal shutdown with hysteresis - all critical for reliable low-power offline SMPS design.

Technical Context

The L6590ED013TR implements voltage-mode PWM control using an internal error amplifier with 70 dB DC gain and 1 MHz unity-gain bandwidth, referenced to a trimmed 2.5 V ±2% bandgap. Its oscillator operates at fixed 65 kHz (reduced to 22 kHz in standby), with max duty cycle limited to 70% and minimum duty cycle at 0%.

Protection architecture includes non-dissipative high-voltage start-up (−4.5 mA sink at drain), cycle-by-cycle current limiting (625 mA typ.), latched OVP triggered at 16.5 V on Vcc, thermal shutdown at 150 °C with 40 °C hysteresis, and brownout detection (2.5 V threshold) exclusive to the SO16W package.

Key Specifications

Pinout & Package

The L6590ED013TR is housed in a SO16W (Small Outline 16-pin Wide) package with exposed thermal pad, optimized for PCB copper heatsinking. Ground pins (9–16) are internally bonded to the metal frame for low R_thj-pins (20 °C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar offline flyback controller applications.

Compared with ICE2A0565Z and LNK304P, the L6590ED013TR uniquely combines integrated high-voltage start-up, programmable brownout detection, latched OVP, and dual-frequency standby - making it optimal for safety-critical, efficiency-regulated auxiliary supplies requiring design flexibility and robust protection.

Availability

L6590ED013TR is available at Aetrix Electronics and suitable for wall plug adapters, monitor auxiliary supplies, desktop PC standby PSUs, and laser printer power modules requiring stable component supply across industrial and consumer production cycles.

Supply support for L6590ED013TR 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, specializing in power management, analog, microcontrollers, and automotive ICs.

The L6590 series belongs to ST's offline AC-DC controller product line, engineered specifically for cost-sensitive, high-efficiency <15 W flyback converters targeting energy-efficient consumer and computing power supplies.

FAQ

What is the function of the BOK pin, and is it available on all L6590 variants?

The BOK (Brownout) pin enables mains undervoltage detection by comparing an external resistor-divider voltage against an internal 2.5 V reference. It is present only on the SO16W package (L6590D), not the MINIDIP (L6590N). When BOK voltage falls below 2.5 V, PWM is disabled to prevent overheating during brownout conditions. The pin uses current hysteresis (±50 µA) for precise threshold control.

How does the standby mode reduce power consumption, and what triggers the transition?

Standby mode reduces switching frequency from 65 kHz to 22 kHz when peak drain current falls below 80 mA, cutting switching losses that dominate light-load inefficiency. Transition back to 65 kHz occurs when peak current exceeds 190 mA - a 110 mA hysteresis prevents oscillation near threshold. The function is digitally filtered to reject noise-induced false triggering.

Can the L6590ED013TR be used with primary-side regulation only, without an optocoupler?

Yes. The L6590ED013TR supports primary-side regulation by grounding the VFB pin and using auxiliary winding voltage feedback directly into the COMP pin. Its high-gain error amplifier (70 dB) and stable 2.5 V reference allow accurate regulation without secondary-side components, reducing cost and improving reliability in space-constrained designs.

What thermal management considerations apply to the SO16W package?

The SO16W package uses pins 9–16 as PGND connections bonded to the metal frame, achieving R_thj-pins = 20 °C/W. For 1.5 W dissipation, ≥3 cm² of 2 oz copper on the PCB is required to maintain T_j ≤ 125 °C. Thermal vias under the exposed pad (if present) and copper pours connected to PGND pins significantly improve heat transfer and long-term reliability.