Document
FSQ0365, FSQ0265, FSQ0165, FSQ321, FSQ311 — Green Mode Fairchild Power Switch (FPS™)
September 2007
FSQ0365, FSQ0265, FSQ0165, FSQ321, FSQ311 Green Mode Fairchild Power Switch (FPS™) for Valley Switching Converter - Low EMI and High Efficiency
Features
Optimized for Valley Switching (VSC) Low EMI through Variable Frequency Control and
Description
A Valley Switching Converter generally shows lower EMI and higher power conversion efficiency than a conventional hard-switched converter with a fixed switching frequency. The FSQ-series is an integrated Pulse-Width Modulation (PWM) controller and SenseFET specifically designed for valley switching operation with minimal external components. The PWM controller includes an integrated fixed-frequency oscillator, Under-Voltage Lockout, Leading Edge Blanking (LEB), optimized gate driver, internal soft-start, temperature-compensated precise current sources for loop compensation, and self-protection circuitry. Compared with discrete MOSFET and PWM controller solutions, the FSQ-series reduces total cost, component count, size and weight; while simultaneously increasing efficiency, productivity, and system reliability. This device provides a basic platform that is well suited for costeffective designs of valley switching fly-back converters.
Inherent Frequency Modulation
High-Efficiency through Minimum Voltage Switching Narrow Frequency Variation Range over Wide Load
and Input Voltage Variation
Advanced Burst-Mode Operation for Low Standby
Power Consumption
Pulse-by-Pulse Current Limit Various Protection Functions: Overload Protection
(OLP), Over-Voltage Protection (OVP), Abnormal Over-Current Protection (AOCP), Internal Thermal Shutdown (TSD) Under-Voltage Lockout (UVLO) with Hysteresis Internal Start-up Circuit Internal High-Voltage SenseFET (650V) Built-in Soft-Start (15ms)
Applications
Power Supply for DVP Player and DVD Recorder,
Set-Top Box
Adapter Auxiliary Power Supply for PC, LCD TV, and PDP TV
Related Application Notes
AN-4137, AN-4141, AN-4147, AN-4150 (Flyback) AN-4134 (Forward)
FPSTM is a trademark of Fairchild Semiconductor Corporation.
© 2006 Fairchild Semiconductor Corporation FSQ0365, FSQ0265, FSQ0165, FSQ321, FSQ311 Rev. 1.0.5 www.fairchildsemi.com
Free Datasheet http://www.Datasheet4U.com
FSQ0365, FSQ0265, FSQ0165, FSQ321, FSQ311 — Green Mode Fairchild Power Switch (FPS™)
Ordering Information
Product Number(5) FSQ311 FSQ311L FSQ321 FSQ321L FSQ0165RN PKG. Operating Temp. Current Limit Maximum Output Power(1) RDS(ON) Max. 230VAC±15%(2)
Adapter(3) Open-Frame(4)
85-265VAC
Adapter(3) Open-Frame(4)
Replaces Devices
8-DIP -40 to +85C 8-LSOP 8-DIP -40 to +85°C 8-LSOP 8-DIP -40 to +85°C 0.9A 0.6A 0.6A
19Ω
7W
10W
6W
8W
FSDL321 FSDM311 FSDL321 FSDM311 FSDL0165RN FSDM0265RN FSDM0265RNB FSDM0365RN FSDM0365RNB
19Ω
8W
12W
7W
10W
10Ω
10W
15W
9W
13W
FSQ0165RL 8-LSOP FSQ0265RN 8-DIP -40 to +85°C FSQ0265RL 8-LSOP FSQ0365RN 8-DIP -40 to +85°C FSQ0365RL 8-LSOP 1.5A 4.5Ω 17.5W 25W 13W 19W 1.2A 6Ω 14W 20W 11W 16W
Notes: 1. The junction temperature can limit the maximum output power. 2. 230VAC or 100/115VAC with doubler. The maximum power with CCM operation. 3. Typical continuous power in a non-ventilated enclosed adapter measured at 50°C ambient temperature. 4. Maximum practical continuous power in an open-frame design at 50°C ambient. 5. Pb-free package per JEDEC J-STD-020B.
© 2006 Fairchild Semiconductor Corporation FSQ0365, FSQ0265, FSQ0165, FSQ321, FSQ311 Rev. 1.0.5 2
www.fairchildsemi.com
Free Datasheet http://www.Datasheet4U.com
FSQ0365, FSQ0265, FSQ0165, FSQ321, FSQ311 — Green Mode Fairchild Power Switch (FPS™)
Typical Circuit
VO
AC IN Vstr Drain PWM Sync Vfb Vcc GND
FSQ0365RN Rev.00
Figure 1. Typical Flyback Application
Internal Block Diagram
Sync 4
+ 0.7V/0.2V + VCC Idelay Vref IFB 3R R SoftStart PWM S LEB 200ns Q Gate driver 0.35/0.55 VBurst OSC + Vref VCC good 8V/12V
Vstr 5
Vcc 2
Drain 6 7 8
Vfb 3
R Q
AOCP
1
6V VSD Sync Vovp 6V VCC good FSQ0365RN Rev.00 TSD 2.5μs time delay S Q VOCP (1.1V)
GND
R Q
Figure 2. Functional Block Diagram
© 2006 Fairchild Semiconductor Corporation FSQ0365, FSQ0265, FSQ0165, FSQ321, FSQ311 Rev. 1.0.5 3
www.fairchildsemi.com
Free Datasheet http://www.Datasheet4U.com
FSQ0365, FSQ0265, FSQ0165, FSQ321, FSQ311 — Green Mode Fairchild Power Switch (FPS™)
Pin Configuration
GND Vcc Vfb Sync 8-DIP 8-LSOP V
D D D Vstr
FSQ0365RN Rev.01
Figure 3. Pin Configuration (Top View)
Pin Definitions
Pin #
1
Name
GND
Description
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 startup (see Internal Block Diagram Section). It is not until VCC reaches the UVLO upper threshold (12V) that the internal start-up switch opens and device power is supplied via the auxiliary transformer winding. The fe.