STR-W605xS - Current Mode Control PWM Regulator IC For Switching Power Supplies

Q: What is STR-W605xS, and what does it integrate?

STR-W605xS is a switching power supply power IC series integrating a power MOSFET and a current mode PWM controller IC, including startup and standby functions.

Q: How does the standby and audible noise suppression work?

In normal operation the device operates in PWM mode; under light load it enters standby mode with burst oscillation, and it suppresses audible noise during standby.

Q: What protection functions are included?

The series includes brown-in/brown-out, overcurrent protection (OCP, pulse-by-pulse), overload protection (OLP, auto-restart with timer), overvoltage protection (OVP, auto-restart), and thermal shutdown protection (TSD, auto-restart).

Oct 12, 2026

Upload by Cipher

STR-W605xS is a power IC series for switching power supplies that integrates a power MOSFET and a current-mode PWM controller with a startup circuit and standby function. The design targets low standby power and reduced external component count while enabling high cost-effectiveness. The internal MOSFET supports a 650 V (min) VDSS and specified RDS(on), with output power ratings of 45–90 W at 230 VAC and 30–60 W across 85–265 VAC, and includes protection and noise-reduction features.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages12

Reading Time30 min

AccessFree to download

Features and Benefits

Description

Applications

Typical Application

Features and Benefits (continued)

Selection Guide

Absolute Maximum Ratings

Functional Block Diagram

Pin-out Diagram

STR-W605xS | Current Mode Control PWM Regulator IC For Switching Power Supplies | | | --- | --- | | Features and Benefits
▪ TO-220F power package with 30 to 90 W power output
▪ Current Mode PWM control
▪ Built-in Random Switching function, reducing EMI noise, and simplifying EMI filters, and therefore reducing cost
▪ Built-in Slope Compensation function, avoiding subharmonic oscillation
▪ Built-in Auto Standby function (Input Power, PIN < 30 mW at no load)
▫ Normal operation: PWM mode
▫ Light load operation: Standby mode (burst oscillation)
▪ Built-in Audible Noise Suppression function during Standby mode
▪ Built-in Startup Circuit, reducing power consumption in standby operation, and eliminating external components.
▪ Bias-Assist function, improving startup operation, suppressing VCC voltage drop in operation, and allowing use of smaller VCC capacitor
▪ Built-in Leading Edge Blanking function Continued on the next page…
Package: 6-Pin fully molded TO-220F-6L (FM207)
Not to scale
| Description
The STR-W605xS series are power ICs for switching power supplies, incorporating a power MOSFET and a current mode PWM controller IC. Including a startup circuit and a standby function in the controller, the product achieves low power consumption, low standby power, and high cost-effectiveness power supply systems with few external components. The STR-W605xSinternalMOSFEThas aVDSS of650V(min), and an RDS(on) of 1.9 Ω (max) to 3.95 Ω (max) with a frequency of 67 kHz. Power output is rated at 45 to 90 W at 230 VAC input and 30 to 60 W at wide input range (85 to 265 VAC) . Thedeviceisprovidedinan industry-standardTO-220package, with heatsink mounting flange and pin 2 removed for increased supply isolation.
Applications:
For switching power supplies used in:
• White goods
• Consumer electronics
• Office automation
• Industrial equipment
• Communication equipment | Typical Application STR-W605xS Current Mode Control PWM Regulator IC For Switching Power Supplies Features and Benefits (continued) ▪ Two-chip structure, with a controller and a power MOSFET with guaranteed avalanche energy available to simplify surge absorber circuits ▪ Protection functions: ▫ Brown-In and Brown-Out Protection function: auto-restart, prevention of excess input current and heat rise at low input voltage ▫ Overcurrent Protection function (OCP): pulse-by-pulse built-in compensation circuit to minimize OCP point variation on AC input voltage ▫ Overload Protection function (OLP): auto-restart, built-in timer, reduces heat during overload condition, and no external components required ▫ Overvoltage Protection function (OVP): Auto-restart ▫ Thermal Shutdown Protection function (TSD): Auto-restart Selection Guide | Part Number | fOSC
(kHz) | MOSFET
VDSS(min)
(V) | RDS(on)
(max)(Ω) | POUT*
(W) | | Package | Packing | | --- | --- | --- | --- | --- | --- | --- | --- | | | | | | 230 V | Wide | | | | STR-W6051S | 67 | 650 | 3.95 | 45 | 30 | TO-220F-6L (Sanken FM207)
with pin 2 removed | 50 pieces per tube | | STR-W6052S | | | 2.8 | 60 | 40 | | | | STR-W6053S | | | 1.9 | 90 | 60 | | | * The listed output power is based on the package thermal ratings, and the peak output power can be 120% to 140% of the value stated here. At low output voltage and short duty cycle, the output power may be less than the value stated here. STR-W605xS Current Mode Control PWM Regulator IC For Switching Power Supplies Absolute Maximum Ratings1 Valid at TA = 25°C, unless otherwise specified | Characteristic | Symbol | Notes | | Terminals | Rating | Unit | | --- | --- | --- | --- | --- | --- | --- | | Drain Peak Current2 | IDpeak | Single pulse | STR-W6051S | 1 – 3 | 5.0 | A | | | | | STR-W6052S | 1 – 3 | 7.0 | A | | | | | STR-W6053S | 1 – 3 | 9.5 | A | | Maximum Switching Current3 | IDMAX | TA = –20°C to 125°C | STR-W6051S | 1 – 3 | 5.0 | A | | | | | ST

FAQs

What is STR-W605xS, and what does it integrate?

STR-W605xS is a switching power supply power IC series integrating a power MOSFET and a current mode PWM controller IC, including startup and standby functions.

How does the standby and audible noise suppression work?

In normal operation the device operates in PWM mode; under light load it enters standby mode with burst oscillation, and it suppresses audible noise during standby.

What protection functions are included?

The series includes brown-in/brown-out, overcurrent protection (OCP, pulse-by-pulse), overload protection (OLP, auto-restart with timer), overvoltage protection (OVP, auto-restart), and thermal shutdown protection (TSD, auto-restart).

Oct 12, 2026

Upload by Cipher