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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
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)
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 cost-
effective designs of valley switching fly-back converters.
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)
FPS
TM
is a trademark of Fairchild Semiconductor Corporation.
© 2006 Fairchild Semiconductor Corporation
FSQ0365, FSQ0265, FSQ0165, FSQ321, FSQ311 Rev. 1.0.5
www.fairchildsemi.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.
Cur-
rent
Limit
Maximum Output Power
(1)
R
DS(ON)
Max.
230VAC±15%
(2)
Adapter
(3)
Open-Frame
(4)
85-265VAC
Adapter
(3)
Open-Frame
(4)
Replaces
Devices
8-DIP
8-LSOP
8-DIP
8-LSOP
8-DIP
-40 to +85C
0.6A
19Ω
7W
10W
6W
8W
FSDL321
FSDM311
FSDL321
FSDM311
FSDL0165RN
FSDM0265RN
FSDM0265RNB
FSDM0365RN
FSDM0365RNB
-40 to +85°C
0.6A
19Ω
8W
12W
7W
10W
FSQ0165RL 8-LSOP
FSQ0265RN
8-DIP
-40 to +85°C
0.9A
10Ω
10W
15W
9W
13W
FSQ0265RL 8-LSOP
FSQ0365RN
8-DIP
-40 to +85°C
1.2A
6Ω
14W
20W
11W
16W
FSQ0365RL 8-LSOP
-40 to +85°C
1.5A
4.5Ω
17.5W
25W
13W
19W
Notes:
1. The junction temperature can limit the maximum output power.
2. 230V
AC
or 100/115V
AC
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
FSQ0365, FSQ0265, FSQ0165, FSQ321, FSQ311 — Green Mode Fairchild Power Switch (FPS™)
Typical Circuit
V
O
AC
IN
Vstr
PWM
Vfb
Vcc
Drain
Sync
GND
FSQ0365RN Rev.00
Figure 1. Typical Flyback Application
Internal Block Diagram
Sync
4
+
0.7V/0.2V
+
V
CC
V
ref
I
delay
I
FB
3R
R
Soft-
Start
PWM
LEB
200ns
S
Q
Gate
driver
0.35/0.55
V
Burst
-
OSC
-
+
V
ref
V
CC
good
-
8V/12V
Vstr
5
Vcc
2
Drain
6 7
8
Vfb
3
R
Q
AOCP
6V
TSD
2.5μs time
delay
V
CC
good
FSQ0365RN Rev.00
S
Q
1
V
OCP
(1.1V)
V
SD
GND
Sync
V
ovp
6V
R
Q
Figure 2. Functional Block Diagram
© 2006 Fairchild Semiconductor Corporation
FSQ0365, FSQ0265, FSQ0165, FSQ321, FSQ311 Rev. 1.0.5
3
www.fairchildsemi.com
FSQ0365, FSQ0265, FSQ0165, FSQ321, FSQ311 — Green Mode Fairchild Power Switch (FPS™)
Pin Configuration
GND
Vcc
Vfb
Sync
FSQ0365RN Rev.01
D
8-DIP
8-LSOP
V
D
D
Vstr
Figure 3. Pin Configuration (Top View)
Pin Definitions
Pin #
1
2
Name
GND
Vcc
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 V
CC
reaches the UVLO upper threshold (12V) that the internal start-up
switch opens and device power is supplied via the auxiliary transformer winding.
The feedback voltage pin is the non-inverting input to the PWM comparator. It has a 0.9mA
current source connected internally while a capacitor and optocoupler are typically connected
externally. There is a time delay while charging external capacitor Cfb from 3V to 6V using an
internal 5μA current source. This time delay prevents false triggering under transient condi-
tions but still allows the protection mechanism to operate under true overload conditions.
This pin is internally connected to the sync-detect comparator for valley switching. Typically the
voltage of the auxiliary winding is used as Sync input voltage and external resistors and capac-
itor are needed to make time delay to match valley point. The threshold of the internal sync
comparator is 0.7V/0.2V.
This pin is connected to the rectified AC line voltage source. At start-up the internal switch sup-
plies internal bias and charges an external storage capacitor placed between the Vcc pin and
ground. Once the Vcc reaches 12V, the internal switch is opened.
The drain pins are designed to connect directly to the primary lead of the transformer and are
capable of switching a maximum of 700V. Minimizing the length of the trace connecting these
pins to the transformer will decrease leakage inductance.
3
Vfb
4
Sync
5
Vstr
6,7,8
Drain
© 2006 Fairchild Semiconductor Corporation
FSQ0365, FSQ0265, FSQ0165, FSQ321, FSQ311 Rev. 1.0.5
4
www.fairchildsemi.com
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