FSDM311L

FSDM311L Datasheet

FSDM311 Green Mode Fairchild Power Switch FPS

Part	Datasheet
FSDM311L	FSDM311L (pdf)

Related Parts	Information
FSDM311	FSDM311

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FSDM311 Green Mode Fairchild Power Switch FPS FSDM311 Green Mode Fairchild Power Switch FPS July 2006 Internal Avalanche Rugged SenseFET Precision Fixed Operating Frequency 67KHz Advanced Burst-Mode Operation power consumption < 0.1W at 265VAC, no-load condition Internal Start-up Circuit Pulse-by-Pulse Current Limit Over-Voltage Protection OVP Over-Load Protection OLP Internal Thermal Shutdown Function TSD Auto-Restart Mode Under-Voltage Lockout UVLO with Hysteresis Built-in Soft-Start Charger & Adapter for Mobile Phone, PDA & MP3 Auxiliary Power for White Goods, PC, C-TV & Monitor Related Application Notes AN-4137, AN-4141, AN-4147 Flyback AN-4134 Forward AN-4138 Charger The FSDM311, consisting of integrated Pulse-Width Modulator PWM and SenseFET, is specifically designed for high-performance, off-line Switch Mode Power Supplies SMPS with minimal external components. This device is an integrated high-voltage, power-switching regulator which combines a VDMOS SenseFET with a voltage mode PWM control block. The integrated PWM controller features include a fixed oscillator, Under-Voltage Lockout UVLO protection, Leading Edge Blanking LEB , an optimized gate turnon/turn-off driver, Thermal Shutdown TSD protection, and temperature-compensated, precision-current sources for loop-compensation and fault-protection circuitry. When compared to a discrete MOSFET and controller or RCC switching converter solution, the FSDM311 device reduces total component count and design size and weight while increasing efficiency, productivity, and system reliability. This device provides a basic platform that is well suited for the design of costeffective flyback converters. Ordering Information Product Number FSDM311 FSDM311L Package 8DIP 8LSOP Marking Code DM311 BVDSS 650V fOSC 67KHz RDS ON FPS is a trademark of Fairchild Semiconductor Corporation. FSDM311 Green Mode Fairchild Power Switch FPS Typical Application & Output Power Table Figure 1 Typical Flyback Application OUTPUT POWER TABLE Product Open Frame 1 230VAC15% 2 85~265VAC FSDM311 FSDM311L Maximum practical continuous power in open-frame design with sufficient drain pattern as a heat sink, at 50°C ambient. 230VAC or 100/115VAC with doubler. Internal Block Diagram Figure 2 Functional Block Diagram of FSDM311 2003 Fairchild Semiconductor Corporation FSDM311 Green Mode Fairchild Power Switch FPS Pin Assignments Figure 3 Pin Configuration Top View Pin Definitions Pin Number Pin Name 4 5 6,7,8 NC Vstr Drain Pin Function Description Ground. SenseFET source terminal on primary side and internal control ground. Positive supply voltage input. Although connected to an auxiliary transformer winding, current is supplied from pin 5 Vstr via an internal switch during start-up see Internal Block Diagram section . When VCC reaches the UVLO upper threshold 9V , the internal start-up switch opens and device power is supplied by the auxiliary transformer winding. Feedback. Inverting input to the PWM comparator with its normal input level between 0.5V and 2.5V. It has a 0.4mA current source connected internally, while a capacitor and opto-coupler are typically connected externally. A feedback voltage of 4.5V triggers overload protection OLP . There is a time delay while charging the external capacitor Cfb from 3V to 4.5V using an internal 5uA current source. This time delay prevents false triggering under transient conditions, but allows the protection mechanism to operate under true overload conditions. No Connection. Start-up. This pin connects directly to the rectified AC line voltage source. At start-up, the internal switch supplies internal bias and charges an external storage capacitor placed between the VCC pin and ground. Once the VCC reaches 9V, the internal switch stops charging the capacitor. SenseFET Drain. The drain pins are designed to connect directly to the primary lead of the transformer and are capable of switching a maximum of 650V. Minimizing the length of the trace connecting these pins to the transformer is recommended to decrease leakage inductance. 2003 Fairchild Semiconductor Corporation

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FSDM311 Green Mode Fairchild Power Switch FPS

FSDM311 Green Mode Fairchild Power Switch FPS

July 2006

Internal Avalanche Rugged SenseFET Precision Fixed Operating Frequency 67KHz Advanced Burst-Mode Operation power consumption
< 0.1W at 265VAC, no-load condition

Internal Start-up Circuit Pulse-by-Pulse Current Limit Over-Voltage Protection OVP Over-Load Protection OLP Internal Thermal Shutdown Function TSD Auto-Restart Mode Under-Voltage Lockout UVLO with Hysteresis Built-in Soft-Start

Charger & Adapter for Mobile Phone, PDA & MP3 Auxiliary Power for White Goods, PC, C-TV & Monitor

Related Application Notes

AN-4137, AN-4141, AN-4147 Flyback AN-4134 Forward AN-4138 Charger

The FSDM311, consisting of integrated Pulse-Width Modulator PWM and SenseFET, is specifically designed for high-performance, off-line Switch Mode Power Supplies SMPS with minimal external components. This device is an integrated high-voltage, power-switching regulator which combines a VDMOS SenseFET with a voltage mode PWM control block. The integrated PWM controller features include a fixed oscillator, Under-Voltage Lockout UVLO protection, Leading Edge Blanking LEB , an optimized gate turnon/turn-off driver, Thermal Shutdown TSD protection, and temperature-compensated, precision-current sources for loop-compensation and fault-protection circuitry. When compared to a discrete MOSFET and controller or RCC switching converter solution, the FSDM311 device reduces total component count and design size and weight while increasing efficiency, productivity, and system reliability. This device provides a basic platform that is well suited for the design of costeffective flyback converters.
Ordering Information

Product Number

FSDM311 FSDM311L

Package
8DIP 8LSOP

Marking Code

DM311

BVDSS
650V
fOSC
67KHz

RDS ON

FPS is a trademark of Fairchild Semiconductor Corporation.

FSDM311 Green Mode Fairchild Power Switch FPS

Typical Application & Output Power Table

Figure 1 Typical Flyback Application

OUTPUT POWER TABLE

Product

Open Frame 1 230VAC15% 2 85~265VAC

FSDM311

FSDM311L

Maximum practical continuous power in open-frame design with sufficient drain pattern as a heat sink, at 50°C ambient.
230VAC or 100/115VAC with doubler.

Internal Block Diagram

Figure 2 Functional Block Diagram of FSDM311
2003 Fairchild Semiconductor Corporation

FSDM311 Green Mode Fairchild Power Switch FPS

Pin Assignments

Figure 3 Pin Configuration Top View

Pin Definitions

Pin Number Pin Name
4 5 6,7,8

NC Vstr Drain

Pin Function Description

Ground. SenseFET source terminal on primary side and internal control ground.

Positive supply voltage input. Although connected to an auxiliary transformer winding, current is supplied from pin 5 Vstr via an internal switch during start-up see Internal Block Diagram section . When VCC reaches the UVLO upper threshold 9V , the internal start-up switch opens and device power is supplied by the auxiliary transformer winding.

Feedback. Inverting input to the PWM comparator with its normal input level between 0.5V and 2.5V. It has a 0.4mA current source connected internally, while a capacitor and opto-coupler are typically connected externally. A feedback voltage of 4.5V triggers overload protection OLP . There is a time delay while charging the external capacitor Cfb from 3V to 4.5V using an internal 5uA current source. This time delay prevents false triggering under transient conditions, but allows the protection mechanism to operate under true overload conditions.

No Connection.

Start-up. This pin connects directly to the rectified AC line voltage source. At start-up, the internal switch supplies internal bias and charges an external storage capacitor placed between the VCC pin and ground. Once the VCC reaches 9V, the internal switch stops charging the capacitor.

SenseFET Drain. The drain pins are designed to connect directly to the primary lead of the transformer and are capable of switching a maximum of 650V. Minimizing the length of the trace connecting these pins to the transformer is recommended to decrease leakage inductance.
2003 Fairchild Semiconductor Corporation

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Datasheet ID: FSDM311L 515533