Fairchild FSCM0465RJX Green mode fairchild power switch Datasheet

FSCM0465R
Green Mode Fairchild Power Switch (FPS™)
Features
Description
„ Internal Avalanche Rugged SenseFET
The FSCM0465R is an integrated Pulse-Width
Modulator (PWM) and SenseFET specifically designed
for high-performance offline Switch Mode Power
Supplies (SMPS) with minimal external components.
This device is an integrated high-voltage powerswitching regulator that combines an avalanche rugged
SenseFET with a current mode PWM control block. 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 a
loop compensation, and self-protection circuitry.
Compared with a discrete MOSFET and PWM controller
solution, it can reduce total cost, component count, size,
and weight while simultaneously increasing efficiency,
productivity, and system reliability. This device is a basic
platform well suited for cost-effective designs of flyback
converters.
„ Low Start-up Current (max. 40µA)
„ Low Power Consumption; under 1W at 240VAC and
0.4W Load
„ Precise Fixed Operating Frequency (66kHz)
„ Frequency Modulation for Low EMI
„ Pulse-by-Pulse Current Limiting (Adjustable)
„ Over-Voltage Protection (OVP)
„ Overload Protection (OLP)
„ Thermal Shutdown Function (TSD)
„ Auto-Restart Mode
„ Under-Voltage Lock Out (UVLO) with Hysteresis
„ Built-in Soft-Start (15ms)
Applications
„ SMPS for VCR, SVR, STB, DVD, and DVCD
„ Adaptor
„ SMPS for LCD Monitor
Related Application Notes
„ AN-4137: Design Guidelines for Off-line Flyback
Converters Using Fairchild Power Switch (FPS)
„ AN-4140: Transformer Design Consideration for
Off-line Flyback Converters using Fairchild Power
Switch
„ AN-4141: Troubleshooting and Design Tips for
Fairchild Power Switch Flyback Applications
„ AN-4148: Audible Noise Reduction Techniques for
FPS Applications
Ordering Information
Product Number
Package
Pb-Free Marking Code
BVDSS
RDS(ON) Max.
Packing
Method
FSCM0465RJ
D2-PAK-6L
Yes
Tube
FSCM0465RJX
D2-PAK-6L
Yes
Tape & Reel
FSCM0465RIWDTU(1)
I2-PAK-6L
Yes
TO-220-6L
Yes
(1)
FSCM0465RGWDTU
CM0465R
650V
2.6 Ω
Tube
Tube
Note:
1. WDTU: Forming Type
FPSTM is a trademark of Fairchild Semiconductor Corporation.
© 2006 Fairchild Semiconductor Corporation
FSCM0465R Rev. 1.0.1
www.fairchildsemi.com
1
FSCM0465R Green Mode Fairchild Power Switch (FPS™)
June 2006
DC
OUT
AC
IN
Drain
PWM
Ilimit
Vfb
Vcc
GND
FSCM0465R Rev. 00
Figure 1. Typical Flyback Application
Output Power Table
Product
230VAC ±15%(3)
Adapter
(1)
Open Frame
85–265VAC
(2)
Adapter
(1)
Open Frame(2)
FSCM0465RJ
40W
55W
30W
40W
FSCM0565RJ
50W
65W
40W
50W
FSCM0765RJ
65W
70W
50W
60W
FSCM0465RI
60W
70W
40W
50W
FSCM0465RG
60W
70W
40W
50W
FSCM0565RG
70W
85W
60W
70W
FSCM0765RG
85W
95W
70W
85W
Notes:
1. Typical continuous power in a non-ventilated enclosed adapter measured at 50°C ambient
2. Maximum practical continuous power in an open-frame design at 50°C ambient
3. 230 VAC or 100/115 VAC with doubler
© 2006 Fairchild Semiconductor Corporation
FSCM0465R Rev. 1.0.1
www.fairchildsemi.com
2
FSCM0465R Green Mode Fairchild Power Switch (FPS™)
Typical Circuit
N.C.
VCC
5
3
Drain
1
VCC Good
0.3/0.5V
+
Internal
Bias
Freq.
Modulation
VCC
Vref
8V/12V
VCC
OSC
IDELAY
IFB
PWM
S
Q
R
Q
2.5R
FB 4
Gate
Driver
R
6
I_limit
Soft start
LEB
0.3K
VSD
VCC
2 GND
S
Q
R
Q
Vovp
TSD
Vcc Good
VCC UV Reset
FSCM0465R Rev. 00
Figure 2. Functional Block Diagram of FSCM0465R
© 2006 Fairchild Semiconductor Corporation
FSCM0465R Rev. 1.0.1
www.fairchildsemi.com
3
FSCM0465R Green Mode Fairchild Power Switch (FPS™)
Internal Block Diagram
FSCM0465RJ
FSCM0465RI
D2-PAK-6L
I2-PAK-6L
6 : I_limit
5 : N.C.
4 : FB
3 : VCC
2 : GND
FSCM0465RI
FSCM0465RJ
6 : I_limit
5 : N.C.
4 : FB
3 : VCC
2 : GND
1 : Drain
1 : Drain
FSCM0465RG
TO-220-6L
FSCM0465RG
6. I_limit
5. N.C.
4. FB
3. VCC
2. GND
1. Drain
Figure 3. Pin Configuration (Top View)
Pin Definitions
Pin Number
Pin Name
Pin Function Description
1
Drain
SenseFET Drain. This pin is the high-voltage power SenseFET drain. It is
designed to drive the transformer directly.
2
GND
Ground. This pin is the control ground and the SenseFET source.
3
VCC
Power Supply. This pin is the positive supply voltage input. During startup,
the power is supplied through the startup resistor from DC link. When VCC
reaches 12V, the power is supplied from the auxiliary transformer winding.
4
Feedback (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 6.0V, the overload protection is activated, resulting in shutdown of the FPS.
5
N.C.
6
I_limit
This pin is not connected.
Current Limit. This pin is for the pulse-by-pulse current limit level programming. By using a resistor to GND on this pin, the current limit level can be
changed. If this pin is left floating, the typical current limit is 2.0A.
© 2006 Fairchild Semiconductor Corporation
FSCM0465R Rev. 1.0.1
www.fairchildsemi.com
4
FSCM0465R Green Mode Fairchild Power Switch (FPS™)
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
(1)
BVDSS
Drain-Source Breakdown Voltage
VDGR
Value
Unit
650
V
Drain-Gate Voltage (RGS=1MΩ)
650
V
VGS
Gate-Source (GND) Voltage
±30
V
IDM
Drain Current Pulsed(2)
16
ADC
TC = 25°C
4.0
ADC
TC = 100°C
2.5
ADC
TC = 25°C
2.3
ADC
TC = 100°C
1.4
ADC
20
V
Continuous Drain Current
(TO-220-6L, I2-PAK-6L)
ID
Continuous Drain Current
(D2-PAK-6L)
VCC
Supply Voltage
VFB
Feedback Voltage Range
PD
Derating
PD
Derating
PD
Derating
-0.3 to VCC
V
140
W
-1.1
W/°C
75
W
-1.5
W/°C
80
W
-0.64
W/°C
Internally limited
°C
Total Power Dissipation (TO-220-6L)
Total Power Dissipation (I2-PAK-6L)
Total Power Dissipation (D2-PAK-6L)
TJ
Operating Junction Temperature
TA
Operating Ambient Temperature
-25 to +85
°C
Storage Temperature
-55 to +150
°C
ESD Capability, HBM Model
(All pins except Vfb)
2.0
(GND-Vfb = 1.5kV)
(VCC-Vfb = 1.0kV)
kV
ESD Capability, Machine Model
(All pins except Vfb)
300
(GND-Vfb = 250V)
(VCC-Vfb = 100V)
V
TSTG
Notes:
1. Tj = 25°C to 150°C
2. Repetitive rating: Pulse-width limited by maximum junction temperature
3. TC: Case back surface temperature with infinite heat sink
© 2006 Fairchild Semiconductor Corporation
FSCM0465R Rev. 1.0.1
www.fairchildsemi.com
5
FSCM0465R Green Mode Fairchild Power Switch (FPS™)
Absolute Maximum Ratings
TA = 25°C unless otherwise specified.
Symbol
Parameter
Condition
Min. Typ. Max. Unit
SenseFET SECTION
IDSS
Zero Gate Voltage Current
VDS = Max, Rating VGS = 0V
-
-
250
µA
Static Drain Source on Resistance(1)
VGS = 10V, ID = 2.3A
-
2.2
2.6
Ω
COSS
Output Capacitance
VGS = 0V, VDS = 25V, f = 1MHz
-
60
-
pF
td(on)
Turn-on Delay Time
-
23
-
-
20
-
-
65
-
-
27
-
RDS(ON)
tr
td(off)
tf
Rise Time
VDD = 325V, ID = 3.2A(4)
Turn-off Delay Time
Fall Time
ns
CONTROL SECTION
60
66
72
kHz
ΔfMOD
fOSC
Switching Frequency Modulation Range
-
±3
-
kHz
tMOD
Switching Frequency Modulation Cycle
-
4
-
ms
0
1
3
%
fSTABLE
Switching Frequency
VCC = 14V, VFB = 5V
Switching Frequency Stability
10V ≤ VCC ≤ 17V
−25°C ≤ TA ≤ +85°C
ΔfOSC
Switching Frequency
-
±5
±10
%
DMAX
Maximum Duty Cycle
75
80
85
%
DMIN
Minimum Duty Cycle
-
-
0
%
11
12
13
V
VSTART
Variation(2)
UVLO Threshold Voltage
VFB = GND
IFB
Feedback Source Current
VFB = GND
tS/S
Internal Soft-Start Time
VSTOP
7
8
9
V
0.7
0.9
1.1
mA
10
15
20
ms
BURST MODE SECTION
VBURH
VBURL
Burst Mode Voltages
VCC = 14V
0.4
0.5
0.6
V
VCC = 14V
0.24
0.3
0.36
V
VCC = 14V, VFB = 5V
2.2
2.5
2.8
A
PROTECTION SECTION
ILIMIT
Peak Current Limit(3)
VOVP
Over-Voltage Protection
18
19
20
V
Thermal Shutdown Temperature(2)
130
145
160
°C
TSD
IDELAY
VSD
Shutdown Delay Current
VFB = 4V
3.5
5.3
7
µA
Shutdown Feedback Voltage
VFB ≥ 5.5V
5.5
6
6.5
V
-
20
40
µA
-
2.5
5
mA
TOTAL DEVICE SECTION
Istart
IOP(MIN)
IOP(MAX)
Startup Current
Operating Supply Current
VCC = 10V, VFB = 0V
VCC = 20V, VFB = 0V
Notes:
1. Pulse Test: Pulse width ≤ 300µS, duty ≤ 2%
2. These parameters, although guaranteed at the design, are not tested in mass production.
3. These parameters indicate the inductor current. Where packages are I2PAK or D2PAK, this should be decreased to
2.0A by external resistor.
4. MOSFET switching time is essentially independent of operating temperature.
© 2006 Fairchild Semiconductor Corporation
FSCM0465R Rev. 1.0.1
www.fairchildsemi.com
6
FSCM0465R Green Mode Fairchild Power Switch (FPS™)
Electrical Characteristics
Function
FSDM0465RB
FSCM0465R
Frequency Modulation
N/A
Available
- Frequency modulation range (ΔfMOD) = ±3kHz
- Frequency modulation cycle (tMOD) = 4ms
Pulse-by-pulse Current Limit
Internally fixed (2.0A max.)
Programmable using external resistor (2.8A max.)
Internal Startup Circuit
Available
N/A (Requires a startup resistor)
Startup current: 40µA (max.)
Packages
TO-220F-6L
TO-220-6L
I2-PAK-6L
D2-PAK-6L
© 2006 Fairchild Semiconductor Corporation
FSCM0465R Rev. 1.0.1
www.fairchildsemi.com
7
FSCM0465R Green Mode Fairchild Power Switch (FPS™)
Comparison Between FSDM0465RB and FSCM0465R
These characteristic graphs are normalized at TA= 25°C.
1.60
Stop Threshold Voltage
(Normalized to 25°C)
1.20
Start up Current
(Normalized to 25°C)
1.40
1.20
1.00
0.80
0.60
1.12
1.04
0.96
0.88
0.80
-50
-25
0
25
50
75
100
125
-50
-25
Junction Temperature [°C]
50
75
100
125
Figure 5. Stop Threshold voltage vs. Temp.
1.20
Start Threshold Voltage
(Normalized to 25°C)
1.20
1.12
Maximum Duty Cycle
(Normalized to 25°C)
25
Junction Temperature [°C]
Figure 4. Startup Current vs. Temp.
1.04
0.96
0.88
0.80
1.12
1.04
0.96
0.88
0.80
-50
-25
0
25
50
75
100
125
-50
-25
Junction Temperature [°C]
0
25
50
75
100
125
Junction Temperature [°C]
Figure 6. Maximum Duty Cycle vs. Temp.
Figure 7. Start Threshold Voltage vs. Temp.
1.20
1.20
1.12
1.12
FB Source Current
(Normalized to 25°C)
Initial Frequency
(Normalized to 25°C)
0
1.04
0.96
0.88
0.80
1.04
0.96
0.88
0.80
-50
-25
0
25
50
75
100
-50
125
0
25
50
75
100
125
Junction Temperature [°C]
Junction Temperature [°C]
Figure 8. Initial Frequency vs. Temp.
Figure 9. Feedback Source Current vs. Temp.
© 2006 Fairchild Semiconductor Corporation
FSCM0465R Rev. 1.0.1
-25
www.fairchildsemi.com
8
FSCM0465R Green Mode Fairchild Power Switch (FPS™)
Typical Performance Characteristics
These characteristic graphs are normalized at TA= 25°C.
1.20
Burst Mode Enable Voltage
(Normalized to 25°C)
Shutdown FB Voltage
(Normalized to 25°C)
1.20
1.12
1.04
0.96
0.88
1.12
1.04
0.96
0.88
0.80
0.80
-50
-25
0
25
50
75
100
-50
125
-25
Figure 10. Shutdown Feedback voltage vs. Temp.
50
75
100
125
1.20
Shutdown Delay Current
(Normalized to 25°C)
Maximum Drain Current
(Normalized to 25°C)
25
Figure 11. Burst Mode Enable Voltage vs. Temp.
1.20
1.12
1.04
0.96
0.88
1.12
1.04
0.96
0.88
0.80
0.80
-50
-25
0
25
50
75
100
-50
125
-25
0
25
50
75
100
125
Junction Temperature [°C]
Junction Temperature [°C]
Figure 12. Maximum Drain Current vs. Temp.
Figure 13. Shutdown Delay Current vs. Temp.
1.20
1.20
Operating Supply Current
(Normalized to 25°C)
Burst Mode Disable Voltage
(Normalized to 25°C)
0
Junction Temperature [°C]
Junction Temperature [°C]
1.12
1.04
0.96
0.88
0.80
1.12
1.04
0.96
0.88
0.80
-50
-25
0
25
50
75
100
125
-50
Junction Temperature [°C]
0
25
50
75
100
125
Junction Temperature [°C]
Figure 14. Burst Mode Disable Voltage vs. Temp.
Figure 15. Operating Supply Current vs. Temp.
© 2006 Fairchild Semiconductor Corporation
FSCM0465R Rev. 1.0.1
-25
www.fairchildsemi.com
9
FSCM0465R Green Mode Fairchild Power Switch (FPS™)
Typical Performance Characteristics (Continued)
The minimum current supplied through the startup
resistor is given by:
1. Startup: Figure 16 shows the typical startup circuit
and transformer auxiliary winding for the FSCM0465R
application. Before the FSCM0465R begins switching, it
consumes only startup current (typically 20µA) and the
current supplied from the DC link supply current
consumed by the FPS (ICC) and charges the external
capacitor (Ca) connected to the VCC pin. When VCC
reaches start voltage of 12V (VSTART), the FSCM0465R
begins switching and the current consumed by the
FSCM0465R increases to 2.5mA. Then the FSCM0465R
continues its normal switching operation and the power
required for this device is supplied from the transformer
auxiliary winding, unless VCC drops below the stop
voltage of 8V (VSTOP). To guarantee the stable operation
of the control IC, VCC has under-voltage lockout (UVLO)
with 4V hysteresis. Figure 17 shows the relationship
between the current consumed by the FPS (ICC) and the
supply voltage (VCC).
Isup min =
FSCM0465R
1
Rstr
(1)
startup resistor should be chosen so that Isupmin is larger
than the maximum startup current (40µA). If not, VCC can
not be charged to the start voltage and FPS fails to start.
2. Feedback Control: The FSCM0465R employs
current mode control, as shown in Figure 18. An optocoupler (such as the H11A817A) and a 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 KA431 exceeds the internal reference
voltage of 2.5V, the H11A817A LED current increases,
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.
2.1 Pulse-by-pulse Current Limit: Because current
mode control is employed, the peak current through the
SenseFET is determined by the inverting input of the
PWM comparator (Vfb*) as shown in Figure 18. When
the current through the opto-transistor is zero and the
current limit pin (#5) is left floating, the feedback current
source (IFB) of 0.9mA flows only through the internal
resistor (R+2.5R=2.8k). In this case, the cathode voltage
of diode D2 and the peak drain current have maximum
values of 2.5V and 2.5A, respectively. The pulse-bypulse current limit can be adjusted using a resistor to
GND on the current limit pin (#5). The current limit level
using an external resistor (RLIM) is given by:
AC line
(Vlinemin - Vlinemax)
Rstr
Da
VCC
)
2 ⋅ Vline min − Vstar t ⋅
where Vlinemin is the minimum input voltage, Vstart is the
start voltage (12V) and Rstr is the startup resistor. The
CDC
ISUP
(
ICC
Ca
FSCM0465R Rev. 00
Figure 16. Startup Circuit
ILIM =
RLIM ⋅ 2.5 A
2.8K Ω + RLIM
(2)
ICC
Vcc
Vref
Idelay
IFB 0.9mA
Vfb
Vo
3mA
4
H11A817A
SenseFET
OSC
D1
CB
D2
2.5R
0.3k
+
Vfb*
Power Up
Power Down
KA431
25μA
FSCM0465R Rev. 00
VCC
Vstop=8V
Vstart=12V
-
RLI M
Vz
VSD
OLP
Rsense
FSCM0465R Rev. 00
Figure 17. Relation Between Operating Supply
Current and VCC Voltage
Figure 18. Pulse Width Modulation (PWM) Circuit
© 2006 Fairchild Semiconductor Corporation
FSCM0465R Rev. 1.0.1
6
Gate
driver
R
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10
FSCM0465R Green Mode Fairchild Power Switch (FPS™)
Functional Description
Ilim_spec × Vdc ×
Ry ≅
Na
Np
3. Protection Circuit: The FSCM0465R has several
self-protective functions, such as overload protection
(OLP), over-voltage protection (OVP) and thermal
shutdown (TSD). Because these protection circuits are
fully integrated into the IC without external components,
the reliability is improved without increasing cost. Once
the fault condition occurs, switching is terminated and
the SenseFET remains off. This causes VCC to fall.
When VCC reaches the UVLO stop voltage of 8V, the
current consumed by the FSCM0465R decreases to the
startup current (typically 20µA) and the current supplied
from the DC link charges the external capacitor (Ca)
connected to the VCC pin. When VCC reaches the start
voltage of 12V, the FSCM0465R resumes normal
operation. In this manner, the auto-restart can alternately
enable and disable the switching of the power SenseFET
until the fault condition is eliminated (see Figure 20).
(3)
Ifb × ΔIlim_comp
where, Ilim_spec is the limit current stated on the
specification; Na and Np are the number of turns for VCC
and primary side, respectively; Ifb is the internal current
source at feedback pin with a typical value of 0.9mA; and
ΔIlim_comp is the current difference which must be
eliminated. In case of capacitor in the circuit 1µF, 100V is
good choice for all applications.
Vds
VDC
Power
On
Fault
occurs
Fault
removed
Np
Vcc
L
12V
8V
Vfb
Drain
t
Na
Vcc
FSCM0465R Rev. 00
I_lim
RLIM
GND
FSCM0465R Rev. 00
CY
+
Vy = VDC ×
Na
Np
Normal
Operation
3.1 Overload Protection (OLP): Overload is defined as
the load current exceeding a preset level due to an
unexpected event. In this situation, the protection circuit
should be activated to protect the SMPS. However, even
when the SMPS is in the normal operation, the overload
protection circuit can be activated during the load
Figure 19. Constant power limit circuit
© 2006 Fairchild Semiconductor Corporation
FSCM0465R Rev. 1.0.1
Fault
Situation
Figure 20. Auto Restart Operation
compensation
network
RY
Normal
Operation
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11
FSCM0465R Green Mode Fairchild Power Switch (FPS™)
2.3 Leading Edge Blanking (LEB): At the instant the
internal SenseFET is turned on, a high-current spike
through the SenseFET usually occurs, caused by
primary-side capacitance and secondary-side rectifier
reverse recovery. Excessive voltage across the Rsense
resistor can lead to incorrect feedback operation in the
current mode PWM control. To counter this effect, the
FSCM0465R employs a leading edge blanking (LEB)
circuit. This circuit inhibits the PWM comparator for a
short time after the SenseFET is turned on.
2.2 Constant Power Limit Circuit: Due to the circuit
delay of FPS, the pulse-by-pulse limit current increases
a little bit when the input voltage increases. This means
unwanted excessive power is delivered to the secondary
side. To compensate, the auxiliary power compensation
network in Figure 19 can be used. RLIM can adjust pulseby-pulse current by absorbing internal current source
(IFB: typical value is 0.9mA), depending on the ratio
between resistors. With the suggested compensation
circuit, additional current from IFB is absorbed more
proportionally to the input voltage (VDC) and achieves
constant power in wide input range. Choose RLIM for
proper current to the application, then check the pulseby-pulse current difference between minimum and
maximum input voltage. To eliminate the difference (to
gain constant power), Ry can be calculated by:
4. Frequency Modulation: EMI reduction can be
accomplished by modulating the switching frequency of
a switched power supply. Frequency modulation can
reduce EMI by spreading the energy over a wider
frequency range than the bandwidth measured by the
EMI test equipment. The amount of EMI reduction is
directly related to the depth of the reference frequency.
As can be seen in Figure 22, the frequency changes
from 63KHz to 69KHz in 4ms.
Drain Current
FSCM0465R Rev. 00
VFB
Overload Protection
Ts
6.0V
Ts
2.5V
Ts
T12= CB*(6.0-2.5)/Idelay
T1
fs
T2
t
69kHz
66kHz
63kHz
Figure 21. Overload Protection
3.2 Over-Voltage Protection (OVP): If the secondaryside feedback circuit were to malfunction or a solder
defect causes an opening in the feedback path, the
current through the opto-coupler transistor becomes
almost zero. In this case, 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 is activated. Because more energy
than required is provided to the output, the output
voltage may exceed the rated voltage before the
overload protection is activated, resulting in the
breakdown of the devices in the secondary side. To
prevent this situation, an over- voltage protection (OVP)
circuit is employed. In general, VCC is proportional to the
output voltage and the FSCM0465R uses VCC instead of
directly monitoring the output voltage. If VCC exceeds
19V, an OVP circuit is activated, resulting in the
termination of the switching operation. To avoid
undesired activation of OVP during normal operation,
VCC should be designed to be below 19V.
FSCM0465R Rev. 00
t
Figure 22. Frequency Modulation
5. Soft-Start: The FSCM0465R has an internal soft-start
circuit that increases PWM comparator inverting input
voltage, together with the SenseFET current, slowly after
it starts up. The typical soft-start time is15ms. The pulse
width to the power switching device is progressively
increased to establish the correct working conditions for
transformers, rectifier diodes, and capacitors. The
voltage on the output capacitors is progressively
increased with the intention of smoothly establishing the
required output voltage. Preventing transformer
saturation and reducing stress on the secondary diode
during startup is also helpful.
© 2006 Fairchild Semiconductor Corporation
FSCM0465R Rev. 1.0.1
4ms
www.fairchildsemi.com
12
FSCM0465R Green Mode Fairchild Power Switch (FPS™)
3.3 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 heat generation from the
SenseFET.
When
the
temperature
exceeds
approximately 145°C, the thermal protection is triggered,
resulting in shutdown of the FPS.
transition. To avoid this undesired operation, the
overload protection circuit is designed to be activated
after a specified time to determine whether it is a
transient situation or an overload situation. Because of
the pulse-by-pulse current limit capability, the maximum
peak current through the SenseFET is limited and the
maximum input power is restricted with a given input
voltage. If the output consumes beyond 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, increasing the feedback voltage (Vfb).
If Vfb exceeds 2.5V, D1 is blocked and the 5.3µA current
source (Idelay) 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 21. The delay time for shutdown is the time
required to charge CB from 2.5V to 6.0V with 5.3µA
(Idelay). A 10 ~ 50ms delay time is typical for most
applications.
FSCM0465R Green Mode Fairchild Power Switch (FPS™)
6. Burst Operation: To minimize power dissipation in
standby mode, the FSCM0465R enters into burst-mode
operation at light load condition. As the load decreases,
the feedback voltage decreases. As shown in Figure 23,
the device automatically enters burst mode when the
feedback voltage drops below VBURL (300mV). 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 (500mV), 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.
Vo
Voset
VFB
0.5V
0.3V
Ids
Vds
time
Switching
disabled
FSCM0465R Rev. 00
T1
T2
T3
Switching
disabled
T4
Figure 23. Waveforms of Burst Operation
© 2006 Fairchild Semiconductor Corporation
FSCM0465R Rev. 1.0.1
www.fairchildsemi.com
13
Application
Output Power
Input Voltage
Output Voltage (Max. Current)
LCD Monitor
40W
Universal Input
(85-265Vac)
5V (2.0A)
12V (2.5A)
Features
„ High efficiency (>81% at 85Vac input)
„ Low standby mode power consumption (<1W at 240Vac input and 0.4W load)
„ Low component count
„ Enhanced system reliability through various protection functions
„ Low EMI through frequency modulation
„ Internal soft-start (15ms)
Key Design Notes
„ Resistors R107 and R108 are employed to prevent startup at low input voltage
„ The delay time for overload protection is designed to be about 50ms with C106 of 100nF. If a faster triggering of OLP
is required, C106 can be reduced to 22nF.
1. Schematic
T101
EER3016
C103
100μF
400V
BD101
2KBP06M
2
1
C104
3.3nF
630V
8
L101
Ferrite Bead
3
IC101
FSCM0465R
6 Ilimit
3
Drain
1
D102
UF4004
4
4
C106
100nF
50V
C102
220nF
275VAC
FB
D201
MBRF1060
VCC 3
GND
2
C105
22μF
50V
R104
20Ω
4
L202
5V / 2.8A
7
C203
1000μF
10V
C204
1000μF
10V
6
5
LF101
23mH
12V / 3.0A
C202
1000μF
25V
C201
1000μF
25V
2
D101
UF 4007
L201
10
1
R103
56kΩ
2W
D202
MBRF10H100
C301
4.7nF
R107
330kΩ
R108
330kΩ
R201
1kΩ
R101
560kΩ
0.5W
RT101
5D-9
C101
220nF
275VAC
R202
1.2kΩ
IC301
H11A817A
F101
FUSE
250V
2A
IC201
KA431
R204
5.6kΩ
R203
10kΩ
C205
47nF
R205
5.6kΩ
FSCM0465R Rev. 01
Figure 24. Demo Circuit
© 2006 Fairchild Semiconductor Corporation
FSCM0465R Rev. 1.0.1
www.fairchildsemi.com
14
FSCM0465R Green Mode Fairchild Power Switch (FPS™)
Typical Application Circuit
EER3016
Np/2
1
10 N
12V
2
9
3
8
4
7
Na 5
6
Np/2
N5V
Figure 25. Transformer Schematic Diagram
3. Winding Specification
No
Pin (s→f)
4→5
Na
Wire
0.2φ
×1
Turns
Winding Method
8
Center Winding
18
Solenoid Winding
7
Center Winding
3
Center Winding
18
Solenoid Winding
Insulation: Polyester Tape t = 0.050mm, 2 Layers
2→1
Np/2
0.4φ × 1
Insulation: Polyester Tape t = 0.050mm, 2 Layers
10 → 8
N12V
0.3φ × 3
Insulation: Polyester Tape t = 0.050mm, 2 Layers
7→6
N5V
0.3φ × 3
Insulation: Polyester Tape t = 0.050mm, 2 Layers
3→2
Np/2
0.4φ × 1
Outer Insulation: Polyester Tape t = 0.050mm, 2 Layers
4. Electrical Characteristics
Pin
Specification
Remarks
Inductance
1-3
520µH ± 10%
100kHz, 1V
Leakage Inductance
1-3
10µH Max
2nd all Short
5. Core & Bobbin
„ Core: EER 3016
„ Bobbin: EER3016
„ Ae(mm2): 96
© 2006 Fairchild Semiconductor Corporation
FSCM0465R Rev. 1.0.1
www.fairchildsemi.com
15
FSCM0465R Green Mode Fairchild Power Switch (FPS™)
2. Transformer
Part
Value
Note
Fuse
F101
Part
Value
Note
C301
4.7nF
Polyester Film Cap.
2A/250V
NTC
RT101
Inductor
5D-9
L201
5µH
Wire 1.2mm
L202
5µH
Wire 1.2mm
Resistor
R101
560kΩ
0.5W
R103
56kΩ
2W
R104
20Ω
1/4W
R107
330kΩ
1/4W
R108
330kΩ
1/4W
D102
UF4004
R201
1kΩ
1/4W
D201
MBRF1060
R202
1.2kΩ
1/4W
D202
MBRF10H100
R203
10kΩ
1/4W
R204
5.6kΩ
1/4W
R205
5.6kΩ
1/4W
Diode
D101
UF4007
Bridge Diode
BD101
2KBP06M 3N257
LF101
23mH
Bridge Diode
Capacitor
Line Filter
C101
220nF/275VAC
Box Capacitor
C102
220nF/275VAC
Box Capacitor
C103
100µF/400V
Electrolytic Capacitor
C104
3.3nF/630V
Ceramic Capacitor
IC101
FSCM0465R
FPS™ (2.5A, 650V)
C105
22µF/50V
Electrolytic Capacitor
IC201
KA431(TL431)
Voltage Reference
C106
100nF/50V
Ceramic Capacitor
IC301
H11A817A
Opto-coupler
C201
1000µF/25V
Electrolytic Capacitor
C202
1000µF/25V
Electrolytic Capacitor
C203
1000µF/10V
Electrolytic Capacitor
C204
1000µF/10V
Electrolytic Capacitor
C205
47nF/50V
Ceramic Capacitor
IC
© 2006 Fairchild Semiconductor Corporation
FSCM0465R Rev. 1.0.1
Wire 0.4mm
www.fairchildsemi.com
16
FSCM0465R Green Mode Fairchild Power Switch (FPS™)
6. Demo Circuit Part List
FSCM0465R Green Mode Fairchild Power Switch (FPS™)
Package Dimensions
D2-PAK-6L
Dimensions are in millimeters unless otherwise specified.
A
1.40
1.00
10.10
9.70
MIN 9.50
9.40
9.00
MIN 9.00
(0.75)
5.10
4.70 MAX1.10
10.00
MAX0.80
MIN 4.00
0.70
0.50
2.19
MIN 0.85
1.75
2.19
1.27
1.27
3.81
1.75
10.20
9.80
B
4.70
4.30
(8.58)
(4.40)
1.40
1.25
R0.45
(1.75)
(0.90)
(7.20)
15.60
15.00
NOTES: UNLESS OTHERWISE SPECIFIED
A) THIS PACKAGE DOES NOT COMPLY
TO ANY CURRENT PACKAGING STANDARD.
B) ALL DIMENSIONS ARE IN MILLIMETERS.
C) DIMENSIONS ARE EXCLUSIVE OF BURRS,
MOLD FLASH, AND TIE BAR EXTRUSIONS.
D) DIMENSIONS AND TOLERANCES PER
ASME Y14.5M-1994
MKT-TO263A6
© 2006 Fairchild Semiconductor Corporation
FSCM0465R Rev. 1.0.1
www.fairchildsemi.com
17
FSCM0465R Green Mode Fairchild Power Switch (FPS™)
Package Dimensions (Continued)
I2-PAK-6L (Forming)
Dimensions are in millimeters unless otherwise specified.
MKT-TO262A6
© 2006 Fairchild Semiconductor Corporation
FSCM0465R Rev. 1.0.1
www.fairchildsemi.com
18
FSCM0465R Green Mode Fairchild Power Switch (FPS™)
Package Dimensions (Continued)
TO-220-6L (Forming)
Dimensions are in millimeters unless otherwise specified.
© 2006 Fairchild Semiconductor Corporation
FSCM0465R Rev. 1.0.1
www.fairchildsemi.com
19
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exhaustive list of all such trademarks.
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FAST®
FASTr™
ActiveArray™
FPS™
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FRFET™
Build it Now™
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CoolFET™
CROSSVOLT™ GTO™
HiSeC™
DOME™
I2C™
EcoSPARK™
2
i-Lo™
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EnSigna™
ImpliedDisconnect™
FACT™
IntelliMAX™
FACT Quiet Series™
Across the board. Around the world.™
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Programmable Active Droop™
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™
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ScalarPump™
SILENT SWITCHER®
SMART START™
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Stealth™
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SuperSOT™-3
SuperSOT™-6
SuperSOT™-8
SyncFET™
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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.
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FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR
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As used herein:
1.
2.
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, or (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 significant injury to the user.
A critical component is any component of a life support device
or system whose failure to perform can be reasonably
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PRODUCT STATUS DEFINITIONS
Definition of Terms
Datasheet Identification
Product Status
Definition
Advance Information
Formative or In Design
This datasheet contains the design specifications for product
development. Specifications may change in any manner without notice.
Preliminary
First Production
This datasheet contains preliminary data, and 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. I19
© 2006 Fairchild Semiconductor Corporation
FSCM0465R Rev. 1.0.1
www.fairchildsemi.com
20
FSCM0465R Green Mode Fairchild Power Switch (FPS™)
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