Green Mode Fairchild Power Switch (FPSTM) - Features - Integrated Pulse Width Modulator (PWM) and Sense FET

Oct 12, 2026

Upload by Rizky

Green Mode Fairchild Power Switch (FPSTM) FSDM07652R is an integrated offline SMPS power switching regulator combining an avalanche rugged Sense FET with a current-mode PWM control block. The design includes fixed-frequency operation, internal startup circuitry, pulse-by-pulse current limiting, abnormal over-current and over-voltage protections, over-load protection, thermal shutdown, auto-restart, and UVLO with hysteresis. Typical use targets flyback converters and SMPS applications for LCD monitors and set-top boxes, emphasizing reduced external components and improved efficiency and reliability.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages20

Reading Time50 min

AccessFree to download

Features

Application

Description

Output Power Table

Typical Circuit

Internal Block Diagram

Pin Definitions

Pin Configuration

Absolute Maximum Ratings

Thermal Impedance

Electrical Characteristics

FSDM07652R Green Mode Fairchild Power Switch (FPSTM) Features • Internal Avalanche Rugged Sense FET • Advanced Burst-Mode operation consumes under 1 W at 240VAC & 0.5W load • Precision Fixed Operating Frequency (66kHz) • Internal Start-up Circuit • Pulse by Pulse Current Limiting • Abnormal Over Current Protection (AOCP) • Over Voltage Protection (OVP) • Over Load Protection (OLP) • Internal Thermal Shutdown Function (TSD) • Auto-Restart Mode • Under Voltage Lock Out (UVLO) with hysteresis • Low Operating Current (2.5mA) • Built-in Soft Start Application • SMPS for LCD monitor and STB • Adaptor Description The FSDM07652R is an integrated Pulse Width Modulator (PWM) and Sense FET specifically designed for high performance offline Switch Mode Power Supplies (SMPS) with minimal external components. This device is an integrated high voltage power switching regulator which combine an avalanche rugged Sense FET with a current mode PWM control block. The PWM controller includes integrated fixed frequency oscillator, under voltage lockout, leading edge blanking (LEB), optimized gate driver, internal soft start, temperature compensated precise current sources for a loop compensation and self protection circuitry. Compared with discrete MOSFET and PWM controller solution, it can reduce total cost, component count, size and weight simultaneously increasing efficiency, productivity, and system reliability. This device is a basic platform well suited for cost effective designs of flyback converters. | OUTPUT POWER TABLE | | | | | | --- | --- | --- | --- | --- | | PRODUCT | 230VAC ±15%(3) | | 85-265VAC | | | | Adapt
er(1) | Open
Frame(2) | Adapt
er(1) | Open
Frame(2) | | FSDM0565R | 60W | 70W | 50W | 60W | | FSDM07652R | 70W | 80W | 60W | 70W | Table 1. Notes: 1. Typical continuous power in a non-ventilated enclosed adapter measured at 50°C ambient. 2. Maximum practical continuous power in an open frame design at 50°C ambient. 3. 230 VAC or 100/115 VAC with doubler. Typical Circuit Rev.1.0.6 Internal Block Diagram Figure 2. Functional Block Diagram of FSDM07652R Pin Definitions | Pin Number | Pin Name | Pin Function Description | | --- | --- | --- | | 1 | Drain | This pin is the high voltage power Sense FET drain. It is designed to drive the transformer directly. | | 2 | GND | This pin is the control ground and the Sense FET source. | | 3 | Vcc | This pin is the positive supply voltage input. During start up, the power is supplied by an internal high voltage current source that is connected to the Vstr pin. When Vcc reaches 12V, the internal high voltage current source is disabled and the power is supplied from the auxiliary transformer winding. | | 4 | Vfb | This pin is internally connected to the inverting input of the PWM comparator. The collector of an opto-coupler is typically tied to this pin. For stable operation, a capacitor should be placed between this pin and GND. If the voltage of this pin reaches 6.0V, the over load protection is activated resulting in shutdown of the FPSTM. | | 5 | N.C | - | | 6 | Vstr | This pin is connected directly to the high voltage DC link. At startup, the internal high voltage current source supplies internal bias and charges the external capacitor that is connected to the Vcc pin. Once Vcc reaches 12V, the internal current source is disabled. | Pin Configuration | TO-220F-6L | | | --- | --- | | | 6.Vstr 5. N.C.
4.Vfb
3.Vcc
2.GND
1.Drain | Figure 3. Pin Configuration (Top View) Absolute Maximum Ratings (Ta=25°C, unless otherwise specified) | Parameter | Symbol | Value | Unit | | --- | --- | --- | --- | | Drain-source voltage | V DSS | 650 | V | | Vstr Max Voltage | VSTR | 650 | V | | Pulsed Drain current (Tc=25°C) (1) | IDM | 15 | ADC | | Continuous Drain Current(Tc=25°C) | ID | 3.8 | A | | Continuous Drain Current(Tc=100°C) | | 2.4 | A | | Single pulsed avalanche energy (2) | E AS | 370 | mJ | | Single

FAQs

What is the FSDM07652R and what is it designed to power?

FSDM07652R is an integrated PWM and Sense FET for high-performance offline switch-mode power supplies (SMPS). It targets flyback converter designs and applications such as LCD monitors and STB adapters.

Which protection and protection-related functions does FPSTM include?

It includes pulse-by-pulse current limiting, abnormal over current protection (AOCP), over-voltage protection (OVP), over-load protection (OLP), internal thermal shutdown (TSD), and under-voltage lockout (UVLO) with hysteresis, plus an auto-restart mode.

How does the startup and supply behavior work for the PWM/Sense FET?

During startup, power is supplied by an internal high-voltage current source connected to the Vstr-related startup path. When Vcc reaches 12V, the internal current source is disabled and the power is supplied from the auxiliary transformer winding.

Oct 12, 2026

Upload by Rizky