FSQ510, FSQ510H, and FSQ510M — Green Mode Fairchild Power Switch (FPS™) for Valley Switching Converter
January 2009
FSQ510, FSQ510H, and FSQ510M
Green Mode Fairchild Power Switch (FPS™)
for Valley Switching Converter
– Low EMI and High Efficiency
Features
Uses an LDMOS Integrated Power Switch
Optimized for Valley Switching Converter (VSC)
Low EMI through Variable Frequency Control and
Inherent Frequency Modulation
High Efficiency through Minimum Drain Voltage
Switching
Extended Valley Switching for Wide Load Ranges
Small Frequency Variation for Wide Load Ranges
Advanced Burst-Mode Operation for Low Standby
Power Consumption
Pulse-by-Pulse Current Limit
Protection Functions: Overload Protection (OLP),
Internal Thermal Shutdown (TSD) with Hysteresis
Under-Voltage Lockout (UVLO) with Hysteresis
Internal Startup Circuit
Internal High-Voltage SenseFET: 700V
Built-in Soft-Start: 5ms
Description
A Valley Switching Converter (VSC) generally shows
lower EMI and higher power conversion efficiency than
a conventional hard-switched converter with a fixed
switching frequency. The FSQ510 (H or M) is an
integrated valley switching pulse width modulation (VS-
PWM) controller and SenseFET specifically designed
for offline switch-mode power supplies (SMPS) for
valley switching with minimal external components. The
VS-PWM controller includes an integrated oscillator,
under-voltage lockout (UVLO), 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 FSQ510 (H or M) can reduce total cost,
component count, size and weight; while simultaneously
increasing efficiency, productivity, and system reliability.
This device provides a platform for cost-effective designs
of a valley switching flyback converters.
Applications
Auxiliary Power Supplies for LCD TV, LCD Monitor,
Personal Computer, and White Goods
Ordering Information
Output Power Table
Operating
Current R
DS(ON)
230V
AC
± 15%
(2)
Replaces
Part
85-265V
AC
Junction
Package Eco
Limit (MAX)
Devices
Number
Open
Open
(3)
(3)
Status Temperature
Adapter
(4)
Adapter
(4)
Frame
Frame
FSQ510
7-DIP
FSD210B
FSQ510H
FSQ510M
8-DIP
7-MLSOP
(1)
RoHS -40 to +130°C 320mA
32Ω
5.5W
9W
4W
6W
FSD210DH
FSD210BM
For Fairchild’s definition of “green” Eco Status, please visit:
http://www.fairchildsemi.com/company/green/rohs_green.html.
Notes:
1. The junction temperature can limit the maximum output power.
2. 230V
AC
or 100/115V
AC
with voltage doubler.
3. Typical continuous power with a Fairchild charger evaluation board described in this datasheet in a non-
ventilated, enclosed adapter housing, measured at 50°C ambient temperature.
4. Maximum practical continuous power for auxiliary power supplies in an open-frame design at 50°C ambient temperature.
© 2009 Fairchild Semiconductor Corporation
FSQ510, FSQ510H, and FSQ510M • Rev. 1.3.0
www.fairchildsemi.com
FSQ510, FSQ510H, and FSQ510M — Green Mode Fairchild Power Switch (FPS™) for Valley Switching Converter
Application Circuit
Vo
AC
IN
V
str
D
Sync
VS
-PWM
V
fb
GND
V
cc
Figure 1.
Typical Application Circuit
Internal Block Diagram
Sync
4 (3)
200 ns
delay
V
CC
5 (7)
V
str
8 (1)
D
7 (8)
V
REF
V
REF
I
FB
0.7V / 0.1V
OSC
S
R
UVLO
8.7V / 6.7V
V
REF
I
delay
V
fb
3
(2)
6R
R
Q
360ns
LEB
R
sense
0.85V / 0.75V
S/S
5ms
TSD
A/R
S
Q
R
(0.4V)
OLP
4.7V
n(m):n stands for the pin number of 7-DIP and 7-MLSOP
m stands for the pin number of 8-DIP
1,2
(4,5,6)
GND
Figure 2.
Internal Block Diagram
© 2009 Fairchild Semiconductor Corporation
FSQ510, FSQ510H, and FSQ510M • Rev. 1.3.0
www.fairchildsemi.com
2
FSQ510, FSQ510H, and FSQ510M — Green Mode Fairchild Power Switch (FPS™) for Valley Switching Converter
Pin Assignments
V
str
V
fb
D
V
cc
FSQ510H
Sync
GND
GND
GND
Figure 3.
Package Diagrams for FSQ510(M) and FSQ510H
Pin Definitions
7-Pin
1, 2
8-Pin
4, 5, 6
Name
GND
Description
This pin is the control ground and the SenseFET source.
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 4.7V, the overload
protection triggers, which shuts down the FPS.
This pin is internally connected to the sync-detect comparator for
valley switching. In normal valley-switching operation, the threshold of
the sync comparator is 0.7V/0.1V.
This pin is the positive supply input. This pin provides internal
operating current for both startup and steady-state operation.
High-voltage power SenseFET drain connection.
This pin is connected directly, or through a resistor, to the high-
voltage DC link. At startup, the internal high-voltage current source
supplies internal bias and charges the external capacitor connected
to the V
CC
pin. Once V
CC
reaches 8.7V, the internal current source is
disabled.
3
2
V
fb
4
5
7
3
7
8
Sync
V
CC
D
8
1
V
str
© 2009 Fairchild Semiconductor Corporation
FSQ510, FSQ510H, and FSQ510M • Rev. 1.3.0
www.fairchildsemi.com
3
FSQ510, FSQ510H, and FSQ510M — Green Mode Fairchild Power Switch (FPS™) for Valley Switching Converter
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device
reliability. The absolute maximum ratings are stress ratings only.
Symbol
V
STR
V
DS
V
CC
V
FB
V
Sync
P
D
V
str
Pin Voltage
Drain Pin Voltage
Supply Voltage
Parameter
Min.
Max.
500
700
20
Internally
(5)
Clamped
6.5
1.38
1.47
+150
Unit
V
V
V
V
V
W
Feedback Voltage Range
Sync Pin Voltage
7-DIP
Total Power Dissipation
7-MLSOP
8-DIP
Maximum Junction Temperature
-0.3
-0.3
T
J
T
STG
Recommended Operating Junction
(6)
Temperature
Storage Temperature
-40
-55
+140
+150
°C
°C
Notes:
5. V
FB
is internally clamped at 6.5V (I
CLAMP_MAX
<100uA) which has a tolerance between 6.2V and 7.2V.
6. The maximum value of the recommended operating junction temperature is limited by thermal shutdown.
Thermal Impedance
T
A
=25°C unless otherwise specified. Items are tested with the standards JESD 51-2 and 51-10 (DIP).
Symbol
7-DIP, 7-MLSOP
θ
JA
θ
JC
8-DIP
θ
JA
θ
JC
Parameter
Junction-to-Ambient Thermal Impedance
Junction-to-Case Thermal Impedance
(8)
(7)
Value
90
13
(7)
Unit
°C/W
°C/W
°C/W
°C/W
Junction-to-Ambient Thermal Impedance
Junction-to-Case Thermal Impedance
(8)
85
13
Notes:
7. Free-standing with no heatsink; without copper clad; measurement condition - just before junction temperature
T
J
enters into TSD.
8. Measured on the DRAIN pin close to plastic interface.
© 2009 Fairchild Semiconductor Corporation
FSQ510, FSQ510H, and FSQ510M • Rev. 1.3.0
www.fairchildsemi.com
4
FSQ510, FSQ510H, and FSQ510M — Green Mode Fairchild Power Switch (FPS™) for Valley Switching Converter
Electrical Characteristics
T
T
J
=25°C unless otherwise specified.
Symbol
BV
DSS
I
DSS
R
DS(ON)
C
ISS
C
OSS
t
r
t
f
f
S
Δf
S
I
FB
tB
B
tB
W
D
MAX
D
MIN
V
START
V
STOP
Parameter
Drain-Source Breakdown Voltage
Zero-Gate-Voltage Drain Current
Drain-Source On-State Resistance
Input Capacitance
Rise Time
(9)
Fall Time
(9)
(9)
Conditions
V
CC
=0V, I
D
=100μA
V
DS
=700V
T
J
=25°C, I
D
=180mA
T
J
=100°C, I
D
=180mA
V
GS
=11V
V
DS
=40V
V
DS
=350V, I
D
=25mA
V
DS
=350V, l
D
=25mA
V
CC
=11V, V
FB
=5V, V
sync
=0V
(9)
Min.
700
Typ.
Max.
Unit
V
SenseFET Section
150
28
42
96
28
100
50
87.7
200
7.2
94.3
±5
225
7.6
3.0
V
CC
=11V, V
FB
=3V
V
CC
=11V, V
FB
=0V
V
FB
=0V, V
CC
Sweep
After Turn-on, V
FB
=0V
V
STR
=40V, V
CC
Sweep
μA
32
48
pF
pF
ns
ns
100.0
±8
250
8.2
kHz
%
μA
μs
μs
66
0
9.4
7.4
7
0.95
0.85
%
%
V
V
ms
V
V
mV
360
5.2
6
5.5
150
mA
V
μA
ns
°C
°C
0.85
0.15
220
V
V
ns
Output Capacitance
(9)
Control Section
Initial Switching Frequency
Switching Frequency Variation
Feedback Source Current
Switching Blanking Time
Valley Detection Window Time
(9)
Maximum Duty Ratio
Minimum Duty Ratio
UVLO Threshold Voltage
-25°C < T
J
< 125°C
V
CC
=11V, V
FB
=0V
V
CC
=11V, V
FB
=1V,
V
sync
Frequency Sweep
54
8.0
6.0
3
0.75
60
8.7
6.7
5
0.85
0.75
100
Internal Soft-Start Time
t
S/S
Burst-Mode Section
V
BURH
V
BURL
HYS
Burst-Mode Voltage
V
CC
=11V, V
FB
Sweep
0.65
Protection Section
I
LIM
V
SD
I
DELAY
t
LEB
T
SD
HYS
V
SH
V
SL
t
Sync
Peak Current Limit
Shutdown Feedback Voltage
Shutdown Delay
Current
FSQ510H
FSQ510(M)
di/dt=90mA/µs
V
DS
=40V, V
CC
=11V,
V
FB
Sweep
V
CC
=11V, V
FB
=5V
280
4.2
4
3.5
130
320
4.7
5
4.5
360
140
60
Leading-Edge Blanking Time
(9)
Thermal Shutdown Temperature
(9)
Synchronous Section
Synchronous Threshold Voltage
Synchronous Delay Time
Operating Supply Current
(Control Part Only)
Startup Charging Current
V
CC
=11V, V
FB
=1V
V
CC
=11V, V
FB
=1V
0.55
0.05
180
0.70
0.10
200
Total Device Section
I
OP
I
CH
V
CC
=11V, V
FB
=5.5V
V
CC
=V
FB
=0V,V
STR
=40V
0.8
1.0
27
1.0
1.2
mA
mA
V
Supply Voltage
V
CC
=V
FB
=0V, V
STR
Sweep
V
STR
Note:
9. These parameters, although guaranteed, are not 100% tested in production.
© 2009 Fairchild Semiconductor Corporation
FSQ510, FSQ510H, and FSQ510M • Rev. 1.3.0
www.fairchildsemi.com
5
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