FSQ500L — Compact, Green Mode, Fairchild Power Switch (FPS™)
February 2009
FSQ500L
Compact, Green Mode, Fairchild Power Switch (FPS™)
Features
Single Chip 700V SenseFET Power Switch
Precision Fixed Operating Frequency: 130kHz
No-load consumption 250mW at 265V
AC
with
Burst Mode and Down to 60mW with External Bias
Internal Startup Switch
Soft-Start Time Tuned by External Capacitor
Under-Voltage Lockout (UVLO) with Hysteresis
Pulse-by-Pulse Current Limit
Overload Protection (OLP) and Internal Thermal
Shutdown Function (TSD) with Hysteresis
Auto-Restart Mode
No Need for Auxiliary Bias Winding
Description
The FSQ500L is specially designed for a replacement
of linear power supplies with low cost. This device
combines current-mode Pulse Width Modulator (PWM)
with a senseFET. The integrated PWM controller
features include: a fixed oscillator, Under Voltage
Lockout (UVLO) protection, Overload Protection (OLP),
Leading-Edge Blanking (LEB), an optimized gate turn-
on/turn-off driver, Thermal Shutdown (TSD) protection
with
hysteresis,
and
temperature-compensated
precision-current sources for loop compensation. When
compared to a linear power supply, the FSQ500L
device reduces total size and weight, while increasing
efficiency, productivity, and system reliability. This
device provides a basic platform for cost-effective
flyback converters.
Applications
Cost-Effective Linear Power Supplies Replacement
Charger and Adapter for Mobile Phone, PDA, MP3,
and Cordless Phone
Maximum Output Power
230Vac ± 15%
Adapter
2.5W
(3)
(2)
(1)
85-265V
AC
Adapter
2.0W
(3)
Related Application Notes
AN-4137, AN-4141, AN-4147,AN-6075 (Flyback)
AN-4138 (Charger)
Open
(4)
Frame
3.0W
Open
(4)
Frame
2.5W
Notes:
1. The junction temperature can limit the maximum
output power.
2. 230V
AC
or 100/115V
AC
with doubler.
3. Typical continuous power in a non-ventilated
enclosed adapter measured at 50°C ambient.
4. Maximum practical continuous power in an open
frame design at 50°C ambient.
Ordering Information
Part Number
FSQ500L
Operating
Temperature Range
-40°C to +85°C
Eco Status
RoHS
Package
4-Lead, Small Outline
Package (SOT223-4L)
Packing Method
Tape & Reel
For Fairchild’s definition of “green” Eco Status, please visit:
http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2008 Fairchild Semiconductor Corporation
FSQ500L • Rev. 1.0.1
www.fairchildsemi.com
FSQ500L — Compact, Green Mode, Fairchild Power Switch (FPS™)
Application Circuit Diagram
AC
IN
DC
OUT
D
PWM
V
FB
V
CC
GND
Figure 1. Typical Application Circuit
Internal Block Diagram
Figure 2. Internal Block Diagram
© 2008 Fairchild Semiconductor Corporation
FSQ500L • Rev. 1.0.1
www.fairchildsemi.com
2
FSQ500L — Compact, Green Mode, Fairchild Power Switch (FPS™)
Pin Assignments
GND
FSQ500L
D
V
CC
V
FB
Figure 3. Package / Pin Diagram
Pin Definitions
Pin #
1
Name
GND
Description
This pin is the control ground and the senseFET source.
High-voltage power senseFET drain connection. In addition, 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 6.0V, all internal blocks are activated. The internal high-voltage current source
is alive until V
CC
reaches 6.5V. After that, the internal high voltage current source turns on and off
irregularly to maintain V
CC
at 6.5V.
This pin is connected to a storage capacitor. A high-voltage regulator connected between pin 2
(D) and this pin provides the supply voltage to the FSQ500L at startup and when switching during
normal operation. The FSQ500L eliminates the need for auxiliary bias winding and associated
external components.
This pin is internally connected to the non-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 4.5V, the overload protection triggers,
which shuts down the FPS.
2
D
3
V
CC
4
V
FB
© 2008 Fairchild Semiconductor Corporation
FSQ500L • Rev. 1.0.1
www.fairchildsemi.com
3
FSQ500L — Compact, Green Mode, Fairchild Power Switch (FPS™)
Absolute Maximum Ratings
The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The
device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables
are not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table defines the
conditions for actual device operation.
Symbol
V
DS
V
CC
V
FB
P
D
I
DM
T
J
T
STG
Parameter
Drain Pin Voltage
Supply Voltage
Feedback Voltage Range
Total Power Dissipation
Drain Current Pulsed
(6)
(5)
Min.
700
Max.
10
Unit
V
V
V
W
A
°C
°C
-0.3
V
CC
0.78
0.41
Operating Junction Temperature
Storage Temperature
-40
-55
Internally Limited
+150
Notes:
5. LDMOS available drain voltage is -0.3V ~ 700V.
6. Repetitive rating: pulse width is limited by maximum junction temperature.
Thermal Impedance
Symbol
θ
JA
Parameter
Junction-to-Ambient Thermal Resistance
(7)
Value
+160
Unit
°C/W
Note:
7. Free-standing with no heat sink; minimum land pattern.
© 2008 Fairchild Semiconductor Corporation
FSQ500L • Rev. 1.0.1
www.fairchildsemi.com
4
FSQ500L — Compact, Green Mode, Fairchild Power Switch (FPS™)
Electrical Characteristics
T
J
= 25°C unless otherwise specified.
Symbol
SenseFET Section
BV
DSS
I
DSS
R
DS(ON)
C
ISS
C
OSS
t
r
t
f
f
S
Δf
S
I
FB(Burst)
I
FB(Normal)
D
MAX
D
MIN
V
START
V
STOP
V
DLY_EN
Parameter
Drain-Source Breakdown Voltage
Zero-Gate-Voltage Drain Current
Drain-Source On-State Resistance
Input Capacitance
Rise Time
Fall Time
(8)
(8)
(8)
Test Conditions
V
CC
= 6.5V, V
FB
= 0V, I
D
= 150μA
V
CC
= 6.5V, V
FB
= 0V, V
DS
= 560V
T
J
= 25°C, I
D
= 25mA
T
J
= 100°C, I
D
= 25mA
V
GS
= 6.5V
V
DS
= 40V, f
S
= 1MHz
V
DS
= 350V, I
D
= 25mA
V
DS
= 350V, l
D
= 25mA
V
CC
= 6.5V, V
FB
= 1.0V
(8)
Min.
700
Typ. Max. Unit
V
150
25
35
42
25
100
50
29
41
μA
Ω
Ω
pF
pF
ns
ns
140
±7
122
250
66
0
6.5
5.5
7.0
kHz
%
μA
μA
%
%
V
V
V
Output Capacitance
(8)
Control Section
Switching Frequency
Switching Frequency Variation
Feedback Source Current
Maximum Duty Ratio
Minimum Duty Ratio
UVLO Threshold Voltage
Shutdown Delay Current Enable
Voltage
120
98
200
54
5.5
4.5
6.0
130
±5
110
225
60
6.0
5.0
6.5
-25°C < T
J
< 125°C
V
CC
= 6.5V, V
FB
= 0V
V
CC
= 6.5V
V
CC
= 6.5V, V
FB
= 4.0V
V
CC
= 6.5V, V
FB
= 0V
V
FB
= 0V, V
CC
Sweep
After Turn-on, V
FB
= 0V, V
CC
Sweep
V
FB
= V
SD
, V
CC
Sweep from 6V
Burst-Mode Section
V
BURH
V
BURL
HYS
Protection Section
I
LIM
V
SD
I
DELAY
t
LEB
t
CLD
TDS
HYS
Peak Current Limit
Shutdown Feedback Voltage
Shutdown Delay Current
Leading Edge Blanking Time
Current Limit Delay Time
(8)
(8)
0.75
Burst Mode Voltage
V
CC
= 6.5V, V
FB
Sweep
0.70
30
di/dt = 150mA/µs
V
CC
= 6.5V, V
FB
Sweep
V
CC
= 6.5V, V
FB
= 4.0V
245
4.1
4
0.80
0.75
50
280
4.5
5
250
100
0.85
0.80
80
315
4.9
6
V
V
mV
mA
V
μA
ns
ns
Thermal Shutdown Temperature
(8)
130
140
80
150
°C
°C
Total Device Section
I
OP-BURST
Operating Supply Current (Control
Part Only)
I
OP-FB
I
CH
V
CCREG
V
CCREG_
TSD
V
CC
= 6.5V, V
FB
= 0V
V
CC
= 6.5V, V
FB
= 4V
V
CC
= V
FB
= 0V, V
DS
= 40V
V
DS
= 40V, V
FB
= 0V
360
640
3.3
6.0
5.2
430
760
6.5
5.7
500
880
7.0
6.2
μA
μA
mA
V
V
Startup Charging Current
Supply Shunt Regulator
Supply Shunt Regulator During
(8)
TSD
Note:
8. These parameters, although guaranteed, are not 100% tested in production.
© 2008 Fairchild Semiconductor Corporation
FSQ500L • Rev. 1.0.1
www.fairchildsemi.com
5
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