Fairchild FSQ0265RN Green mode fairchild power switch (fps) for quasi-resonant operation - low emi and high efficiency Datasheet

FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311
Green Mode Fairchild Power Switch (FPS™) for
Quasi-Resonant Operation - Low EMI and High Efficiency
Features
Description
„ Optimized for Quasi-Resonant Converter (QRC)
A Quasi-Resonant Converter (QRC) 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 quasi-resonant
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
solution, the FSQ-series can reduce 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 quasi-resonant switching flyback converters.
„ 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 Sense FET (650V)
Built-in Soft-Start (15ms)
Applications
„ Power Supply for DVP Player and DVD Recorder
„ Power supply for Set-Top Box
„ Adapter
„ Auxiliary Power Supply for PC, LCD TV, and PDP TV
Ordering Information
Maximum Output Power(1)
Operating Current RDS(ON)
Product
PKG.
Temp.
Limit
Max.
Number(5)
230VAC±15%(2)
85-265VAC
Adapter(3)
Open
Frame(4)
Adapter(3)
Open
Frame(4)
Replaces
Devices
FSQ311
8-DIP -25 to +85°C
0.6A
19Ω
7W
10W
6W
8W
FSDL321
FSDM311
FSQ0165RN
8-DIP -25 to +85°C
0.9A
10Ω
10W
15W
9W
13W
FSDL0165RN
FSQ0265RN
8-DIP -25 to +85°C
1.2A
6Ω
14W
20W
11W
16W
FSDM0265RN
FSDM0265RNB
FSQ0365RN
8-DIP -25 to +85°C
1.5A
4.5Ω
17.5W
25W
13W
19W
FSDM0365RN
RSDM0365RNB
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.
FPSTM is a trademark of Fairchild Semiconductor Corporation.
© 2006 Fairchild Semiconductor Corporation
FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Rev. 1.0.0
www.fairchildsemi.com
FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPS™) for QRC
November 2006
FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPS™) for QRC
Application Diagram
VO
AC
IN
Vstr
Drain
PWM
Sync
GND
VCC
FB
FSQ0365RN Rev.00
Figure 1. Typical Flyback Application
Internal Block Diagram
Sync
4
Vstr
VCC
5
2
Drain
6 7
8
+
OSC
0.7V/0.2V
+
+
Vref
VCC
Idelay
FB
3
0.35/0.55
VBurst
Vref
VCC good
-
8V/12V
IFB
PWM
3R
R
SoftStart
S
LEB
200ns
Q
Gate
driver
R Q
AOCP
6V
VSD
Sync
Vovp
S
TSD
2.5μs time
delay
1
Q
R Q
VOCP
(1.1V)
GND
6V
VCC good
FSQ0365RN Rev.00
Figure 2. Internal Block Diagram
© 2006 Fairchild Semiconductor Corporation
FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Rev. 1.0.0
www.fairchildsemi.com
2
D
GND
D
VCC
8-DIP
FB
D
Sync
Vstr
FSQ0365RN Rev.00
Figure 3. Pin Configuration (Top View)
Pin Definitions
Pin #
Name
1
GND
Ground. This pin is the control ground and the SenseFET source.
Description
2
VCC
Power Supply. This pin is the positive supply input. This pin provides internal
operating current for both start-up and steady-state operation.
3
FB
Feedback. 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 6V, the overload protection triggers, which shuts
down the FPS.
4
Sync
Sync. This pin is internally connected to the sync-detect comparator for quasiresonant switching. In normal quasi-resonant operation, the threshold of the
sync comparator is 0.7V/0.2V.
5
Vstr
Start-up. This pin is connected directly to the high-voltage DC link. At start-up,
the internal high-voltage current source supplies internal bias and charges the
external capacitor connected to the VCC pin. Once VCC reaches 12V, the internal current source is disabled.
6
Drain
SenseFET drain. High-voltage power SenseFET drain connection.
7
Drain
SenseFET drain. High-voltage power SenseFET drain connection.
8
Drain
SenseFET drain. High-voltage power SenseFET drain connection.
© 2006 Fairchild Semiconductor Corporation
FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Rev. 1.0.0
www.fairchildsemi.com
3
FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPS™) for QRC
Pin Configuration
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. TA = 25°C, unless otherwise specified.
Symbol
Parameter
Min.
Max.
Unit
Vstr
Vstr Pin Voltage
500
V
VDS
Drain Pin Voltage
650
V
VCC
Supply Voltage
20
V
VFB
Feedback Voltage Range
-0.3
9.0
V
Sync Pin Voltage
-0.3
9.0
V
VSync
IDM
EAS
Drain Current Pulsed(6)
Single Pulsed Avalanche Energy(7)
FSQ0365RN
12
FSQ0265RN
8
FSQ0165RN
4
FSQ311
1.5
FSQ0365RN
230
FSQ0265RN
140
FSQ0165RN
50
FSQ311
10
mJ
PD
Total Power Dissipation
TJ
Operating Junction Temperature
TA
Operating Ambient Temperature
-25
85
°C
Storage Temperature
-55
150
°C
TSTG
1.5
A
ESD Capability, HBM Model
Internally limited
(8)
ESD Capability, Machine Model
W
°C
CLASS1 C
(8)
CLASS B
Notes:
6. Repetitive rating: Pulse width limited by maximum junction temperature.
7. L=14mH, starting TJ=25°C.
8. Meets JEDEC Standards JESD 22-A114 and 22-A115.
Thermal Impedance(9)
Symbol
Parameter
Value
Unit
8-DIP
θJA(10)
θJC(11)
θJT(12)
Junction-to-Ambient Thermal Resistance
80
Junction-to-Case Thermal Resistance
20
Junction-to-Top Thermal Resistance
35
°C/W
Notes:
9. All items are tested with the standards JESD 51-2 and 51-10 (DIP).
10. Free-standing, with no heat-sink, under natural convection.
11. Infinite cooling condition - refer to the SEMI G30-88.
12. Measured on the PKG top surface.
© 2006 Fairchild Semiconductor Corporation
FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Rev. 1.0.0
www.fairchildsemi.com
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FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPS™) for QRC
Absolute Maximum Ratings
TA = 25°C unless otherwise specified.
Symbol
Parameter
Condition
Min. Typ. Max. Unit
SENSEFET SECTION
BVDSS
Drain Source Breakdown Voltage
VCC = 0V, ID = 100µA
IDSS
Zero-Gate-Voltage Drain Current
VDS = 560V
FSQ0365RN
RDS(ON)
CSS
COSS
CRSS
td(on)
tr
td(off)
tf
Drain-Source onState Resistance
Input Capacitance
Output Capacitance
Reverse Transfer
Capacitance
Turn-On Delay Time
Rise Time
Turn-Off Delay Time
Fall Time
650
V
100
3.5
4.5
5.0
6.0
8.0
10.0
FSQ311
14.0
19.0
FSQ0365RN
315
FSQ0265RN
FSQ0165RN
FSQ0265RN
FSQ0165RN
TJ = 25°C, ID = 0.5A
VGS = 0V, VDS = 25V, f = 1MHz
550
250
FSQ311
162
FSQ0365RN
47
FSQ0265RN
FSQ0165RN
VGS = 0V, VDS = 25V, f = 1MHz
38
25
FSQ311
18
FSQ0365RN
9.0
FSQ0265RN
FSQ0165RN
VGS = 0V, VDS = 25V, f = 1MHz
17.0
10.0
FSQ311
3.8
FSQ0365RN
11.2
FSQ0265RN
FSQ0165RN
VDD = 350V, ID = 25mA
20.0
12.0
FSQ311
9.5
FSQ0365RN
34
FSQ0265RN
FSQ0165RN
VDD = 350V, ID = 25mA
15
4
FSQ311
19
FSQ0365RN
28.3
FSQ0265RN
FSQ0165RN
VDD = 350V, ID = 25mA
55.0
30.0
FSQ311
33.0
FSQ0365RN
32
FSQ0265RN
FSQ0165RN
VDD = 350V, ID = 25mA
FSQ311
10
Ω
pF
pF
pF
ns
ns
ns
ns
42
© 2006 Fairchild Semiconductor Corporation
FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Rev. 1.0.0
25
µA
www.fairchildsemi.com
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FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPS™) for QRC
Electrical Characteristics
TA = 25°C unless otherwise specified.
Symbol
Parameter
Condition
Min. Typ. Max. Unit
CONTROL SECTION
tON.MAX
Maximum ON Time
TJ = 25°C
tB
Blanking Time
tW
Detection Time Window
fS
Initial Switching Frequency
Variation(13)
Switching Frequency
IFB
Feedback Source Current
VFB = 0V
Minimum Duty Cycle
VFB = 0V
VSTART
VSTOP
tS/S
12.0
13.5
µsec
15.0
16.8
µsec
TJ = 25°C, Vsync = 0V
ΔfS
DMIN
10.5
13.2
3.0
50.5
55.6
±5
±10
%
700
900
1100
µA
0
%
12
13
V
8
9
-25°C < TJ < 85°C
11
UVLO Threshold Voltage
After turn-on
Internal Soft-Start Time
µsec
7
With free-running frequency
61.7
15
kHz
V
ms
BURST-MODE SECTION
TJ = 25°C, tPD = 200ns(14)
VBURH
VBURL
Burst-Mode Voltages
0.45
0.55
0.65
0.25
0.35
0.45
Hysteresis
200
V
V
mV
PROTECTION SECTION
FSQ0365RN
ILIMIT
VSD
IDELAY
TJ = 25°C, di/dt = 240mA/µsec
1.32
1.50
1.68
FSQ0265RN
TJ = 25°C, di/dt = 200mA/µsec
1.06
1.20
1.34
FSQ0165RN
TJ = 25°C, di/dt = 150mA/µsec
0.8
0.9
1.0
FSQ311
TJ = 25°C, di/dt = 100mA/µsec
0.53
0.60
0.67
Shutdown Feedback Voltage
VCC = 15V
5.5
6.0
6.5
V
Shutdown Delay Current
VFB = 5V
5
6
µA
Peak Current Limit
tLEB
Leading-Edge Blanking Time(13)
VOVP
Over-Voltage Protection
tOVP
Over-Voltage Protection Blanking Time
TSD
Thermal Shutdown
4
200
VCC = 15V, VFB = 2V
Temperature(13)
A
ns
5.5
6.0
6.5
V
2
3
4
µsec
125
140
155
°C
0.55
0.70
0.85
V
0.14
0.20
0.26
V
SYNC SECTION
VSH
VSL
tsync
Sync Threshold Voltage
Sync Delay
Time(13)(15)
300
ns
TOTAL DEVICE SECTION
IOP
ISTART
ICH
VSTR
Operating Supply Current
(Control Part Only)
VCC = 15V
Start Current
Start-up Charging Current
1
3
5
mA
VCC = VSTART - 0.1V
(before VCC reaches VSTART)
270
360
450
µA
VCC = 0V, VSTR = min. 40V
0.65
0.85
1.00
mA
Minimum VSTR Supply Voltage
26
V
Notes:
13. Though guaranteed, it is not tested in the mass production.
14. Propagation delay in the control IC.
15. Include gate turn-on time.
© 2006 Fairchild Semiconductor Corporation
FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Rev. 1.0.0
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FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPS™) for QRC
Electrical Characteristics (Continued)
Function
FSDM0x65RNB
FSQ-Series
FSQ-Series Advantages
Operation method
Constant frequency
PWM
Quasi-resonant
operation
„ Improved efficiency by valley switching
EMI reduction
Frequency
modulation
Valley switching &
inherent frequency
modulation
„ Reduce EMI noise by two ways
„ Reduced EMI noise
„ Improved standby power by valley switch-
Burst-mode operation Fixed burst peak
Protection
ing also in burst-mode
Advanced burst-mode „ Because the current peak during burst
operation is dependent on VFB, it is easier
to solve audible noise
„ Improved reliability through precise abnor-
AOCP
mal over-current protection
© 2006 Fairchild Semiconductor Corporation
FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Rev. 1.0.0
www.fairchildsemi.com
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FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPS™) for QRC
Comparison Between FSDM0x65RNB and FSQ-Series
1.2
1.2
1.0
1.0
Normalized
Normalized
These characteristic graphs are normalized at TA= 25°C.
0.8
0.6
0.4
0.2
0.0
-25
0.8
0.6
0.4
0.2
0
25
50
75
100
0.0
-25
125
0
Temperature [°C]
1.2
1.2
1.0
1.0
0.8
0.6
0.4
0.2
100
125
0.6
0.4
0.2
0
25
50
75
100
0.0
-25
125
0
25
50
75
100
125
Temperature [°C]
Figure 6. UVLO Stop Threshold Voltage (VSTOP)
vs. TA
Figure 7. Start-up Charging Current (ICH) vs. TA
1.2
1.2
1.0
1.0
Normalized
Normalized
75
0.8
Temperature [°C]
0.8
0.6
0.4
0.2
0.0
-25
50
Figure 5. UVLO Start Threshold Voltage (VSTART)
vs. TA
Normalized
Normalized
Figure 4. Operating Supply Current (IOP) vs. TA
0.0
-25
25
Temperature [°C]
0.8
0.6
0.4
0.2
0
25
50
75
100
0.0
-25
125
Temperature [°C]
25
50
75
100
125
Temperature [°C]
Figure 8. Initial Switching Frequency (fS) vs. TA
Figure 9. Maximum On Time (tON.MAX) vs. TA
© 2006 Fairchild Semiconductor Corporation
FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Rev. 1.0.0
0
www.fairchildsemi.com
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FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPS™) for QRC
Typical Performance Characteristics
1.2
1.2
1.0
1.0
Normalized
Normalized
These characteristic graphs are normalized at TA= 25°C.
0.8
0.6
0.4
0.2
0.8
0.6
0.4
0.2
0.0
-25
0
25
50
75
100
0.0
-25
125
0
Temperature [°C]
1.2
1.2
1.0
1.0
0.8
0.6
0.4
100
125
0.8
0.6
0.4
0
25
50
75
100
0.0
-25
125
0
25
50
75
100
125
Temperature [°C]
Temperature [°C]
Figure 12. Shutdown Delay Current (IDELAY) vs. TA
Figure 13. Burst-Mode High Threshold Voltage
(Vburh) vs. TA
1.2
1.2
1.0
1.0
Normalized
Normalized
75
0.2
0.2
0.8
0.6
0.4
0.8
0.6
0.4
0.2
0.2
0.0
-25
50
Figure 11. Feedback Source Current (IFB) vs. TA
Normalized
Normalized
Figure 10. Blanking Time (tB) vs. TA
0.0
-25
25
Temperature [°C]
0
25
50
75
100
0.0
-25
125
Figure 14. Burst-Mode Low Threshold Voltage
(Vburl) vs. TA
25
50
75
100
125
Figure 15. Peak Current Limit (ILIM) vs. TA
© 2006 Fairchild Semiconductor Corporation
FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Rev. 1.0.0
0
Temperature [°C]
Temperature [°C]
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FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPS™) for QRC
Typical Performance Characteristics (Continued)
1.2
1.2
1.0
1.0
Normalized
Normalized
These characteristic graphs are normalized at TA= 25°C.
0.8
0.6
0.4
0.2
0.0
-25
0.8
0.6
0.4
0.2
0
25
50
75
100
0.0
-25
125
0
Temperature [°C]
50
75
100
125
Figure 17. Sync Low Threshold Voltage (VSL) vs. TA
1.2
1.2
1.0
1.0
Normalized
Normalized
Figure 16. Sync High Threshold Voltage (VSH) vs. TA
0.8
0.6
0.4
0.2
0.0
-25
25
Temperature [°C]
0.8
0.6
0.4
0.2
0
25
50
75
100
0.0
-25
125
Temperature [°C]
25
50
75
100
125
Temperature [°C]
Figure 18. Shutdown Feedback Voltage (VSD) vs. TA
Figure 19. Over-Voltage Protection (VOV) vs. TA
© 2006 Fairchild Semiconductor Corporation
FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Rev. 1.0.0
0
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FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPS™) for QRC
Typical Performance Characteristics (Continued)
1. Startup: At startup, an internal high-voltage current
source supplies the internal bias and charges the
external capacitor (Ca) connected to the VCC pin, as
illustrated in Figure 20. When VCC reaches 12V, the FPS
begins switching and the internal high-voltage current
source is disabled. The FPS continues its normal
switching operation and the power is supplied from the
auxiliary transformer winding unless VCC goes below the
stop voltage of 8V.
Vref
VCC
Idelay
VDC
VFB
VO
3
FOD817A
SenseFET
OSC
D1
CB
D2
3R
Ca
+
VFB*
KA431
VCC
2
5
Gate
driver
R
-
Vstr
OLP
VSD
Rsense
FSQ0365RN Rev. 00
ICH
Figure 21. Pulse-Width-Modulation (PWM) Circuit
Vref
8V/12V
IFB
VCC good
FSQ0365RN Rev.00
3. Synchronization: The FSQ-series employs a quasiresonant switching technique to minimize the switching
noise and loss. The basic waveforms of the quasiresonant converter are shown in Figure 22. To minimize
the MOSFET's switching loss, the MOSFET should be
turned on when the drain voltage reaches its minimum
value, as shown in Figure 22. The minimum drain
voltage is indirectly detected by monitoring the VCC
winding voltage, as shown in Figure 22.
Internal
Bias
Figure 20. Start-up Circuit
2. Feedback Control: FPS employs current mode
control, as shown in Figure 21. An opto-coupler (such as
the FOD817A) and shunt regulator (such as the KA431)
are typically used to implement the feedback network.
Comparing the feedback voltage with the voltage across
the Rsense resistor makes it possible to control the
switching duty cycle. When the reference pin voltage of
the shunt regulator exceeds the internal reference
voltage of 2.5V, the opto-coupler LED current increases,
thus pulling down the feedback voltage and reducing the
duty cycle. This event typically happens when the input
voltage is increased or the output load is decreased.
Vds
VRO
tF
Vsync
Vovp (6V)
2.1 Pulse-by-Pulse Current Limit: Because current
mode control is employed, the peak current through the
SenseFET is limited by the inverting input of PWM
comparator (VFB*), as shown in Figure 21. Assuming
that the 0.9mA current source flows only through the
internal resistor (3R + R = 2.8k), the cathode voltage of
diode D2 is about 2.5V. Since D1 is blocked when the
feedback voltage (VFB) exceeds 2.5V, the maximum
voltage of the cathode of D2 is clamped at this voltage,
thus clamping VFB*. Therefore, the peak value of the
current through the SenseFET is limited.
0.7V
0.2V
300ns Delay
MOSFET Gate
ON
ON
FSQ0365RN Rev.00
Figure 22. Quasi-Resonant Switching Waveforms
© 2006 Fairchild Semiconductor Corporation
FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Rev. 1.0.0
VRO
VDC
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FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPS™) for QRC
2.2 Leading Edge Blanking (LEB): At the instant the
internal SenseFET is turned on, a high-current spike
usually occurs through the SenseFET, caused by
primary-side capacitance and secondary-side rectifier
reverse recovery. Excessive voltage across the Rsense
resistor would lead to incorrect feedback operation in the
current mode PWM control. To counter this effect, the
FPS employs a leading edge blanking (LEB) circuit. This
circuit inhibits the PWM comparator for a short time
(tLEB) after the SenseFET is turned on.
Functional Description
voltage. If the output consumes more than this maximum
power, the output voltage (VO) decreases below the set
voltage. This reduces the current through the optocoupler LED, which also reduces the opto-coupler
transistor current, thus increasing the feedback voltage
(VFB). If VFB exceeds 2.8V, D1 is blocked and the 5µA
current source starts to charge CB slowly up to VCC. In
this condition, VFB continues increasing until it reaches
6V, when the switching operation is terminated, as
shown in Figure 24. The delay time for shutdown is the
time required to charge CB from 2.8V to 6V with 5µA. A
20 ~ 50ms delay time is typical for most applications.
VFB
FSQ0365RN Rev.00
Overload protection
6.0V
2.8V
VDS
Power
on
Fault
occurs
Fault
removed
t12= CFB*(6.0-2.8)/Idelay
t1
t2
t
Figure 24. Overload Protection
4.2 Abnormal Over-Current Protection (AOCP): When
the secondary rectifier diodes or the transformer pins are
shorted, a steep current with extremely high-di/dt can
flow through the SenseFET during the LEB time. Even
though the FSQ-series has OLP (Overload Protection), it
is not enough to protect the FSQ-series in that abnormal
case, since severe current stress is imposed on the
SenseFET until OLP triggers. The FSQ-series has an
internal AOCP (Abnormal Over-Current Protection)
circuit as shown in Figure 25. When the gate turn-on
signal is applied to the power SenseFET, the AOCP
block is enabled and monitors the current through the
sensing resistor. The voltage across the resistor is
compared with a preset AOCP level. If the sensing
resistor voltage is greater than the AOCP level, the set
signal is applied to the latch, resulting in the shutdown of
the SMPS.
VCC
12V
8V
t
FSQ0365RN Rev. 00
Normal
operation
Fault
situation
Normal
operation
Figure 23. Auto Restart Protection Waveforms
4.1 Overload Protection (OLP): Overload is defined as
the load current exceeding its normal level due to an
unexpected abnormal event. In this situation, the
protection circuit should trigger to protect the SMPS.
However, even when the SMPS is in the normal
operation, the overload protection circuit can be
triggered during the load transition. To avoid this
undesired operation, the overload protection circuit is
designed to trigger only after a specified time to
determine whether it is a transient situation or a true
overload situation. Because of the pulse-by-pulse
current limit capability, the maximum peak current
through the Sense FET is limited, and therefore the
maximum input power is restricted with a given input
3R
OSC
PWM
LEB
200ns
S
Q
R
Q
Gate
driver
R
Rsense
1
GND
+
AOCP
FSQ0365RN Rev.00
VOCP
Figure 25. Abnormal Over-Current Protection
© 2006 Fairchild Semiconductor Corporation
FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Rev. 1.0.0
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FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPS™) for QRC
4. Protection Circuits: The FSQ-series has several
self-protective functions, such as Overload Protection
(OLP), Abnormal Over-Current protection (AOCP), OverVoltage Protection (OVP), and Thermal Shutdown
(TSD). All the protections are implemented as autorestart mode. Once the fault condition is detected,
switching is terminated and the SenseFET remains off.
This causes VCC to fall. When VCC falls down to the
Under-Voltage Lockout (UVLO) stop voltage of 8V, the
protection is reset and start-up circuit charges VCC
capacitor. When the VCC reaches the start voltage of
12V, the FSQ-series resumes normal operation. If the
fault condition is not removed, the SenseFET remains off
and VCC drops to stop voltage again. In this manner, the
auto-restart can alternately enable and disable the
switching of the power SenseFET until the fault condition
is eliminated. Because these protection circuits are fully
integrated into the IC without external components, the
reliability is improved without increasing cost.
VO
VOset
VFB
0.55V
0.35V
IDS
VDS
time
4.4 Thermal Shutdown (TSD): The SenseFET and the
control IC are built in one package. This makes it easy
for the control IC to detect the abnormal over
temperature of the SenseFET. If the temperature
exceeds ~150°C, the thermal shutdown triggers.
FSQ0365RN Rev.00
t2 t3
Switching
disabled
t4
Figure 26. Waveforms of Burst Operation
7. Switching Frequency Limit: To minimize switching
loss and EMI (Electromagnetic Interference), the
MOSFET turns on when the drain voltage reaches its
minimum value in quasi-resonant operation. However,
this causes switching frequency to increases at light load
conditions. As the load decreases, the peak drain current
diminishes and the switching frequency increases. This
results in severe switching losses at light-load condition,
as well as intermittent switching and audible noise.
Because of these problems, the quasi-resonant
converter topology has limitations in a wide range of
applications.
5. Soft-Start: The FPS has an internal soft-start circuit
that increases PWM comparator inverting input voltage
with the SenseFET current slowly after it starts up. The
typical soft-start time is 15ms, The pulse width to the
power switching device is progressively increased to
establish the correct working conditions for transformers,
inductors, and capacitors. The voltage on the output
capacitors is progressively increased with the intention of
smoothly establishing the required output voltage. This
mode helps prevent transformer saturation and reduces
stress on the secondary diode during startup.
To overcome this problem, FSQ-series employs a
frequency-limit function, as shown in Figures 27 and 28.
Once the SenseFET is turned on, the next turn-on is
prohibited during the blanking time (tB). After the
blanking time, the controller finds the valley within the
detection time window (tW) and turns on the MOSFET, as
shown in Figures 27 and 28 (Cases A, B, and C). If no
valley is found during tW, the internal SenseFET is forced
to turn on at the end of tW (Case D). Therefore, our
devices have a minimum switching frequency of 55kHz
and a maximum switching frequency of 67kHz, as shown
in Figure 28.
6. Burst Operation: To minimize power dissipation in
standby mode, the FPS enters burst-mode operation. As
the load decreases, the feedback voltage decreases. As
shown in Figure 26, the device automatically enters
burst-mode when the feedback voltage drops below
VBURL (350mV). At this point, switching stops and the
output voltages start to drop at a rate dependent on
standby current load. This causes the feedback voltage
to rise. Once it passes VBURH (550mV), switching
resumes. The feedback voltage then falls and the
process repeats. Burst-mode operation alternately
enables and disables switching of the power SenseFET,
thereby reducing switching loss in standby mode.
© 2006 Fairchild Semiconductor Corporation
FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Rev. 1.0.0
t1
Switching
disabled
www.fairchildsemi.com
13
FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPS™) for QRC
4.3 Over-Voltage Protection (OVP): If the secondary
side feedback circuit malfunctions or a solder defect
causes an opening in the feedback path, the current
through the opto-coupler transistor becomes almost
zero. Then, VFB climbs up in a similar manner to the
overload situation, forcing the preset maximum current
to be supplied to the SMPS until the overload protection
triggers. Because more energy than required is provided
to the output, the output voltage may exceed the rated
voltage before the overload protection triggers, resulting
in the breakdown of the devices in the secondary side.
To prevent this situation, an OVP circuit is employed. In
general, the peak voltage of the sync signal is
proportional to the output voltage and the FSQ-series
uses a sync signal instead of directly monitoring the
output voltage. If the sync signal exceeds 6V, an OVP is
triggered, shutting down the SMPS. To avoid undesired
triggering of OVP during normal operation, the peak
voltage of the sync signal should be designed below 6V.
67kHz
IDS
IDS
A
59kHz
55kHz
A
B
C
Constant
frequency
D
tB=15μs
Burst
mode
ts
IDS
IDS
B
PO
FSQ0365RN Rev. 00
tB=15μs
Figure 28. Switching Frequency Range
ts
IDS
IDS
C
tB=15μs
ts
IDS
IDS
tB=15μs
tsmax=18μs
D
tW=3μs
FSQ0365RN Rev. 00
Figure 27. QRC Operation with Limited Frequency
© 2006 Fairchild Semiconductor Corporation
FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Rev. 1.0.0
www.fairchildsemi.com
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FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPS™) for QRC
When the resonant period is 2μs
tsmax=18μs
Application
Input Voltage
Range
FPS Device
DVD Player
Power Supply
FSQ0365RN
Rated Output Power
Output Voltage
(Max. Current)
19W
5.1V (1.0A)
3.4V (1.0A)
12V (0.4A)
16V (0.3A)
85-265VAC
Features
„ High efficiency ( >77% at universal input)
„ Low standby mode power consumption (<1W at 230VAC input and 0.5W load)
„ Reduce EMI noise through Quasi-Resonant Operation
„ Enhanced system reliability through various protection functions
„ Internal soft-start (15ms)
Key Design Notes
„ The delay time for overload protection is designed to be about 30ms with C107 of 47nF. If faster/slower triggering of
OLP is required, C107 can be changed to a smaller/larger value (eg. 100nF for 60ms).
„ The input voltage of Vsync must be higher than -0.3V. By proper voltage sharing by R106 & R107 resistors, the input
voltage can be adjusted.
„ The SMD-type 100nF capacitor must be placed as close as possible to VCC pin to avoid malfunction by abrupt pul-
sating noises and to improved surge immunity.
1. Schematic
C209
47pF
T101
EER2828
RT101
5D-9
1
R105
100kΩ
C104
10nF
630V
R102
56kΩ
C103
33μF
400V
L201
11
C210
47pF
2
R108
62Ω
12V, 0.4A
3
10
IC101
FSQ0365RN
1
BD101
Bridge
Diode
3
Sync
8
Drain
7
Drain
6
Drain
FB
Vcc
Vstr
4
3
4
C102
100nF,275VAC
C105
47nF
50V
GND
1
C202
470μF
35V
C201
470μF
35V
L202
D101
1N 4007
2
5
16V, 0.3A
D201
UF4003
D202
UF4003
C203
470μF
35V
C204
470μF
35V
12
C106 C107
100nF 22μF
2 SMD 50V
L203
6
R103
5Ω
D102
1N 4004 R104
12kΩ
5.1V, 1A
D203
SB360
4
C205
1000μF
10V
C206
1000μF
10V
L204
5
9
ZD101
1N4746A
3.4V, 1A
D204
SB360
D103
1N4148
LF101
40mH
R106 R107
6.2kΩ 6.2kΩ
C110
33pF
50V
8
C302
3.3nF
C101
100nF
275VAC
R201
510Ω
R203
6.2kΩ
R202
1kΩ
TNR
10D471K
C208
1000μF
10V
C207
1000μF
10V
R204
20kΩ
C209
100nF
IC202
FOD817A
F101
FUSE
IC201
KA431
AC IN
R205
6kΩ
FSQ0365RN Rev:00
Figure 29. Demo Circuit
© 2006 Fairchild Semiconductor Corporation
FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Rev. 1.0.0
www.fairchildsemi.com
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FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPS™) for QRC
Application Information
EER2828
12
Np/2
1
Np/2
Np/2 2
3
Na 4
11
N16V
N16V
10
N12V
N12V
9 N
3.4V
Na
N5.1V
8
6mm
5
3mm
N3.4V
7
Np/2
6 N
5.1V
FSQ0365RN Rev: 00
Figure 30. Transformer Schematic Diagram
3. Winding Specification
No
Pin (s→f)
Np/2
Wire
0.25φ
3→2
Turns
×1
Winding Method
50
Center Solenoid Winding
4
Center Solenoid Winding
2
Center Solenoid Winding
16
Center Solenoid Winding
14
Center Solenoid Winding
18
Center Solenoid Winding
50
Center Solenoid Winding
Insulation: Polyester Tape t = 0.050mm, 2 Layers
N3.4V
0.33φ × 2
9→8
Insulation: Polyester Tape t = 0.050mm, 2 Layers
N5V
0.33φ × 1
6→9
Insulation: Polyester Tape t = 0.050mm, 2 Layers
Na
0.25φ × 1
4→5
Insulation: Polyester Tape t = 0.050mm, 2 Layers
N12V
0.33φ × 3
10 → 12
Insulation: Polyester Tape t = 0.050mm, 3 Layers
N16V
0.33φ × 3
11 → 12
Insulation: Polyester Tape t = 0.050mm, 2 Layers
Np/2
0.25φ × 1
2→1
Insulation: Polyester Tape t = 0.050mm, 2 Layers
4. Electrical Characteristics
Pin
Specification
Remarks
Inductance
1-3
1.4mH ± 10%
100kHz, 1V
Leakage
1-3
25µH Max.
Short all other pins
5. Core & Bobbin
„ Core: EER2828 (Ae=86.66mm2)
„ Bobbin: EER2828
© 2006 Fairchild Semiconductor Corporation
FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Rev. 1.0.0
www.fairchildsemi.com
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FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPS™) for QRC
2. Transformer
Part
Value
Note
Part
Value
Note
Resistor
Inductor
R102
56kΩ
1W
L201
10µH
R103
5Ω
1/2W
L202
10µH
R104
12kΩ
1/4W
L203
4.9µH
R105
100kΩ
1/4W
L204
4.9µH
R106
6.2kΩ
1/4W
R107
6.2kΩ
1/4W
Diode
D101
IN4007
R108
62Ω
1W
D102
IN4004
R201
510Ω
1/4W
ZD101
1N4746A
R202
1kΩ
1/4W
D103
1N4148
R203
6.2kΩ
1/4W
D201
UF4003
R204
20kΩ
1/4W
D202
UF4003
R205
6kΩ
1/4W
D203
SB360
D204
SB360
Capacitor
C101
100nF/275VAC
Box Capacitor
C102
100nF/275VAC
Box Capacitor
C103
33µF/400V
Electrolytic Capacitor
IC101
FSQ0365RN
FPS™
C104
10nF/630V
Film Capacitor
IC201
KA431 (TL431)
Voltage reference
C105
47nF/50V
Mono Capacitor
IC202
FOD817A
Opto-coupler
C106
100nF/50V
SMD (1206)
C107
22µF/50V
Electrolytic Capacitor
Fuse
2A/250V
C110
33pF/50V
Ceramic Capacitor
C201
470µF/35V
Electrolytic Capacitor
C202
470µF/35V
Electrolytic Capacitor
C203
470µF/35V
Electrolytic Capacitor
C204
470µF/35V
Electrolytic Capacitor
C205
1000µF/10V
Electrolytic Capacitor
C206
1000µF/10V
Electrolytic Capacitor
C207
1000µF/10V
Electrolytic Capacitor
C208
1000µF/10V
Electrolytic Capacitor
C209
100nF /50V
Ceramic Capacitor
IC
Fuse
NTC
RT101
5D-9
BD101
2KBP06M2N257
Bridge Diode
Line Filter
LF101
40mH
Transformer
T101
Varistor
TNR
© 2006 Fairchild Semiconductor Corporation
FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Rev. 1.0.0
Bridge Diode
10D471K
www.fairchildsemi.com
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FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPS™) for QRC
6. Demo Board Part List
8-DIP
#5
1.524 ±0.10
0.060 ±0.004
#4
0.018 ±0.004
#8
2.54
0.100
9.60
MAX
0.378
#1
9.20 ±0.20
0.362 ±0.008
(
6.40 ±0.20
0.252 ±0.008
0.46 ±0.10
0.79
)
0.031
Dimensions are in millimeters unless otherwise noted.
5.08
MAX
0.200
7.62
0.300
3.40 ±0.20
0.134 ±0.008
3.30 ±0.30
0.130 ±0.012
0.33
0.013 MIN
+0.10
0.25 –0.05
+0.004
0~15°
0.010 –0.002
September 1999, Rev B
8dip_dim.pdf
© 2006 Fairchild Semiconductor Corporation
FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Rev. 1.0.0
www.fairchildsemi.com
18
FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPS™) for QRC
Package Dimensions
ACEx¥
ActiveArray¥
Bottomless¥
Build it Now¥
CoolFET¥
CROSSVOLT¥
DOME¥
EcoSPARK¥
2
E CMOS¥
EnSigna¥
FACT¥
FACT Quiet Series¥
®
FAST
FASTr¥
FPS¥
FRFET¥
GlobalOptoisolator¥
GTO¥
HiSeC¥
2
I C¥
i-Lo¥
ImpliedDisconnect¥
IntelliMAX¥
ISOPLANAR¥
LittleFET¥
MICROCOUPLER¥
MicroFET¥
MicroPak¥
MICROWIRE¥
MSX¥
MSXPro¥
OCX¥
OCXPro¥
®
OPTOLOGIC
OPTOPLANAR¥
PACMAN¥
POP¥
Power247¥
PowerEdge¥
PowerSaver¥
®
PowerTrench
®
QFET
QS¥
QT Optoelectronics¥
Quiet Series¥
RapidConfigure¥
RapidConnect¥
ScalarPump¥
PSerDes¥
®
SILENT SWITCHER
SMART START¥
SPM¥
Stealth¥
SuperFET¥
SuperSOT¥-3
SuperSOT¥-6
SuperSOT¥-8
SyncFET¥
TCM¥
TinyBoost¥
TinyBuck¥
®
TinyLogic
TINYOPTO¥
TinyPower¥
TinyPWM¥
TruTranslation¥
UHC¥
®
UltraFET
UniFET¥
VCX¥
Wire¥
Across the board. Around the world.¥
Programmable Active Droop¥
®
The Power Franchise
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS
HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE
APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER
ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. THESE SPECIFICATIONS DO NOT EXPAND THE TERMS OF FAIRCHILD’S
WORLDWIDE TERMS AND CONDITIONS, SPECIFICALLY THE WARRANTY THEREIN, WHICH COVERS THESE PRODUCTS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR
SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION.
As used herein:
1.
Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body or
(b) support or sustain life, and (c) whose failure to perform
when properly used in accordance with instructions for use
provided in the labeling, can be reasonably expected to
result in a significant injury of the user.
2.
A critical component in any component of a life support,
device, or system whose failure to perform can be
reasonably expected to cause the failure of the life
support device or system, or to affect its safety or
effectiveness.
PRODUCT STATUS DEFINITIONS
Definition of Terms
Datasheet Identification
Product Status
Advance Information
Formative or In
Design
This datasheet contains the design specifications for product
development. Specifications may change in any manner without
notice.
Definition
Preliminary
First Production
This datasheet contains preliminary data; supplementary data will
be published at a later date. Fairchild Semiconductor reserves the
right to make changes at any time without notice to improve design.
No Identification Needed
Full Production
This datasheet contains final specifications. Fairchild
Semiconductor reserves the right to make changes at any time
without notice to improve design.
Obsolete
Not In Production
This datasheet contains specifications on a product that has been
discontinued by Fairchild Semiconductor. The datasheet is printed
for reference information only.
Rev. I20
© 2006 Fairchild Semiconductor Corporation
FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Rev. 1.0.0
www.fairchildsemi.com
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FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPS™) for QRC
TRADEMARKS
The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not intended to be an
exhaustive list of all such trademarks.