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FS6X0420RJ/ FS6X0720RJ/ FS6X1220RJ Fairchild Power Switch (FPSTM)
March 2006
FS6X0420RJ/ FS6X0720RJ/ FS6X1220RJ Fairchild Power Switch (FPSTM)
Features
Current Mode PWM Control with a Fixed Operating Frequency (300kHz) Pulse by Pulse Current Limit Over Load Protection Over Voltage Protection Thermal Shutdown Line Under Voltage Detection and Sleep on/off Function Internal High Voltage SenseFET (200V) Supports Forward or Flyback Topology
Description
The FS6X-Series is specially designed for off-line DC-DC converters with minimal external components. This device combines a current mode PWM controller with a high voltage power SenseFET in a single package. The PWM controller includes integrated fixed frequency oscillator, line under voltage lockout, sleep on/off function, thermal shutdown protection, over voltage protection, pulse-by-pulse current limit, and temperature compensated precise current sources for a loop compensation. Compared with the discrete MOSFET and PWM controller solution, the FS6X-Series can reduce total cost, component count, size, and weight, while simultaneously increasing efficiency, productivity, and system reliability.
Applications
DC-DC Converter PoE Device
OUTPUT POWER TABLE(1)
PRODUCT FS6X0420RJ FS6X0720RJ FS6X1220RJ 36VDC~72VDC 14W 26W 36W
Related Application Notes
AN4137 - Design Guidelines for Off-line Flyback Converters Using Fairchild Power Switch (FPS) AN4140 - Transformer Design Consideration for Off-line Flyback Converters using Fairchild Power Switch AN4141 - Troubleshooting and Design Tips for Fairchild Power Switch Flyback Applications AN4148 - Audible Noise Reduction Techniques for FPS Applications
Table 1. Maximum Output Power
Note: 1. Maximum practical continuous power in an open frame design at 50C ambient.
Ordering Information
Part Number
FS6X0420RJ FS6X0720RJ FS6X1220RJ FS6X0420RJX FS6X0720RJX FS6X1220RJX
(2)
Operating Temp. Range
-25C to +85C -25C to +85C -25C to +85C -25C to +85C -25C to +85C -25C to +85C
Pb-Free
Yes Yes Yes Yes Yes Yes
Package
D2-Pak-6L D2-Pak-6L D2-Pak-6L D2-Pak-6L D2-Pak-6L D2-Pak-6L
Packing Method
Tube Tube Tube Tape & Reel Tape & Reel Tape & Reel
Marking Code
6X0420R 6X0720R 6X1220R 6X0420R 6X0720R 6X1220R
Note: 2. X : Tape & Reel
FPSTM is a trademark of Fairchild Semiconductor Corporation
(c)2006 Fairchild Semiconductor Corporation
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FS6X0420RJ/ FS6X0720RJ/ FS6X1220RJ Fairchild Power Switch (FPSTM)
Typical Application Diagram
DC IN
Drain
DC OUT
PWM
L/S Vfb Vcc GND
Figure 1. Typical Flyback Application
Internal Block Diagram
VCC 3 VLU Line UVLO VCC Good 9V/15V Enable VSL VCC Idelay FB 4 R VSD VCC
S Q
Drain 1
Line Sense
6 Vref Internal Bias
Vref IFB 28R
OSC
S
Q
R
Q
Gate Driver
VOVP TSD Line UVLO 5 N.C VCC Good
R Q
2 GND
Figure 2. Functional Block Diagram of FS6X-Series
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Pin Assignments
D2-PAK-6L
6. Line Sense 5. N.C. 4. Vfb 3. Vcc 2. GND 1. Drain
Figure 3. Pin Configuration (Top View)
Pin Definitions
Pin Number
1 2 3
Pin Name
Drain GND Vcc
Pin Function Description
This pin is the high voltage power SenseFET drain connection. This pin is the control ground and the SenseFET source. This pin is the positive supply input. This pin provides internal operating current for both start-up and steady-state operation. 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 7.5V, the over load protection is activated resulting in shutdown of the IC. This pin is not connected. According to the voltage of this pin, three operation modes are defined: normal operation mode, line under voltage lock out mode, and sleep mode. If the voltage of this pin is smaller than 2.55V, the IC goes into the line under voltage lock out, stopping switching operation. If the voltage of this pin is smaller than 1.8V, the IC enters into sleep mode. During sleep mode, reference voltage generation circuit including the shunt regulator is disabled and only 300uA operation current is required.
4 5
Feedback (FB) N.C.
6
Line Sense (LS)
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Absolute Maximum Ratings
(Ta=25C, unless otherwise specified.) Parameter
Drain-source Voltage Pulsed Drain Current (Tc=25C)(1) IDM
Symbol
VDSS FS6X0420RJ FS6X0720RJ FS6X1220RJ FS6X0420RJ
Value
200 10.2 16.2 23.7 3.4 5.4 12.4 2.1 3.4 7.9 35 -0.3 to VCC 43 54 125 Internally limited -25 to +85 -55 to +150
Unit
V A A (rms)
Continuous Drain Current (Tc=25C)
ID
FS6X0720RJ FS6X1220RJ FS6X0420RJ
A (rms)
Continuous Drain Current (Tc=100C) Supply Voltage Input Voltage Range Total Power Dissipation (Tc=25C) Operating Junction Temperature Operating Ambient Temperature Storage Temperature Range
ID
FS6X0720RJ FS6X1220RJ VCC VFB FS6X0420RJ
V V W
PD Tj
FS6X0720RJ FS6X1220RJ TA TSTG
C C C
Note: 1. Repetitive rating: Pulse width limited by maximum junction temperature.
Thermal Impedance
Parameter
Junction-to-Ambient Thermal Junction-to-Case Thermal(1) JC
Symbol
JA FS6X0420RJ FS6X0720RJ FS6X1220RJ
Value
2.9 2.3 1.0
Unit
C/W C/W
Note: 1. Infinite cooling condition - Refer to the SEMI G30-88.
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Electrical Characteristics
(Ta=25C, unless otherwise specified.) Parameter
SENSE FET SECTION Drain Source Breakdown Voltage Zero Gate Voltage Drain Current IDSS BVDSS VGS = 0V, ID = 250A VDS = 200V, VGS = 0V VDS = 160V VGS = 0V, TC = 125C 200 VGS = 10V, ID = 2.5A VGS = 0V VDS = 25V, f = 1MHz 220 1.2 0.64 0.24 32 49 125 250 250 1.5 0.75 0.30 45 65 160 pF V A A
Symbol
Condition
Min.
Typ .
Max.
Unit
FS6X0420RJ
(1)
Static Drain Source on Resistance
RDS(ON)
FS6X0720RJ FS6X1220RJ FS6X0420RJ
Output Capacitance
COSS
FS6X0720RJ FS6X1220RJ
CONTROL SECTION Initial Frequency Voltage Stability Temperature Stability (2) Maximum Duty Cycle Minimum Duty Cycle Start Threshold Voltage Stop Threshold Voltage Feedback Source Current PROTECTION SECTION Peak Current Limit (3) ILimit FS6X0420RJ FS6X0720RJ FS6X1220RJ Over Voltage Protection Thermal Shutdown Temperature (2) Shutdown Feedback Voltage Shutdown Delay Current VOVP TSD VSD IDELAY VFB 6.9V VFB = 5V VCC > 6.9V 1.2 2.3 2.8 23 140 6.9 4.0 1.4 2.7 3.2 25 160 7.5 5.0 1.6 3.1 3.6 27 8.1 6.0 V C V A A FOSC FSTABLE FOSC DMAX DMIN VSTART VSTOP IFB 12V Vcc 23V -25C Ta 85C VFB = GND VFB = GND VFB = GND 270 0 0 72 14 8 0.7 300 1 5 80 15 9 0.9 330 3 10 88 0 16 10 1.1 kHz % % % % V V mA
Notes: 1. Pulse test: Pulse width 300S, duty 2%. 2. These parameters, although guaranteed at the design, are not tested in mass production. 3. These parameters indicate the inductor current.
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Electrical Characteristics
(Ta=25C, unless otherwise specified.)
Parameter
TOTAL DEVICE SECTION Startup Current (1) Sleep Mode Current
Symbol
Condition
Min.
Typ .
Max.
Unit
Istart ISLEEP IOP
VFB = GND, VCC = 14V V = 1V, VCC = 16V VFB = GND, VCC = 16V VFB = GND, VCC = 12V VFB = GND, VCC = 20V -
-
60 300
120 500
uA uA
Operating Supply Current
(1)
IOP(MIN) IOP(MAX)
-
10
15
mA
Line UVLO Threshold Voltage Sleep On/Off Threshold Voltage
VLU VSL
2.4 1.5
2.55 1.8
2.7 2.1
V V
Notes: 1. This parameter is the current flowing into the control IC.
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Typical Performance Characteristics
(These Characteristic Graphs are Normalized at Ta= 25C.)
[mA] 11.0
[V] 16.0
10.5
15.5
10.0
15.0
9.5
14.5
9.0 -25 0 25 50 75 100 125 150 Temp []
14.0 -25 0 25 50 75 100 125 150 Temp []
Figure 4. Operating Current vs. Temp
[V] 9.50
Figure 7. Start Threshold Voltage vs. Temp
[KHz] 305.0 303.0 301.0
9.25
9.00 299.0 8.75 297.0 295.0 -25 0 25 50 75 100 125 150 -25 0 25 50 75 100 125 150 Temp [] Temp []
8.50
Figure 5. Stop Threshold voltage vs. Temp
[%] 81.0
Figure 8. Operating Frequency vs. Temp
[mA] 1.10 1.05
80.5 1.00 80.0 0.95 0.90 79.5 0.85 79.0 -25 0 25 50 75 100 125 150 Temp [] 0.80 -25 0 25 50 75 100 125 150 Temp []
Figure 6. Maximum Duty vs. Temp
Figure 9. Feedback Source Current vs. Temp
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Typical Performance Characteristics (Continued)
(These Characteristic Graphs are Normalized at Ta= 25C)
[V] 7.60 [uA] 5.3 5.2 7.55 5.1 7.50 5.0 4.9 7.45 4.8 7.40 -25 0 25 50 75 100 125 150 Temp [] 4.7 -25 0 25 50 75 100 125 150 Temp []
Figure 10. Shutdown FB Voltage vs. Temp
[V] 26.0
Figure 13. Shutdown Delay Current vs. Temp
[V] 2.7
25.5
2.6
25.0
2.5
24.5
2.4
24.0 -25 0 25 50 75 100 125 150 Temp []
2.3 -25 0 25 50 75 100 125 150 Temp []
Figure 11. Over Voltage Protection vs. Temp
[uA] 60 58 56 54 52 50 -25 0 25 50 75 100 125 150
Figure 14. LineUVLO threshold Voltage vs.Temp
[A] 3.30 3.25 3.20 3.15 3.10 3.05 3.00 -25 0 25 50 75 100 125 150 Temp []
Temp []
Figure 12. Start Up Current vs. Temp
Figure 15. Current Limit vs. Temp
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Applications Information
1. Startup
To guarantee stable operation of the control IC, Vcc has under voltage lockout (UVLO) with 6V hysteresis. Figure 16 shows the relation between the supply current (Icc) and the supply voltage (Vcc). Before Vcc reaches 15V, the start-up current is 60A, which is usually provided by the DC link through start-up resistor. When Vcc reaches 15V, the control IC begins operation and the operating current increases to 10mA as shown. Once the control IC starts operation, it continues its normal operation unless Vcc goes below the stop voltage of 9V.
Icc
3. Protection Circuit
Besides pulse-by-pulse current limit, the FS6X-Series has the following self protection functions: over load 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. In the event of a fault condition, FS6X-Series enters into auto-restart operation. Once the fault condition occurs, switching operation is terminated, and the MOSFET remains off, which causes Vcc to be reduced. When Vcc reaches 9V, the protection is reset and the supply current reduces to 60uA. Then, Vcc begin to increase with the current provided through the start-up resistor. When Vcc reaches 15V, FS6X-Series resumes its normal operation if the fault condition is removed. In this manner, the autorestart alternately enables and disables the switching of the power MOSFET until the fault condition is eliminated as illustrated in Figure 18.
10mA
Power on Fault occurs Fault removed
Vds
60uA Vstop=9V Vstart=15V Vz
Vcc
Figure 16. Relation between Supply Current and Voltage 2. Feedback Control
The FS6X-Series employs current mode control. The voltage of the feedback pin is compared with the current sense voltage for pulse width modulation (PWM). Figure 17 illustrates the simplified PWM block. The feedback voltage determines the peak drain current of the SenseFET. Usually, an opto-coupler, along with the TL431(shunt regulator) are used to implement the feedback network. The collector of the opto-coupler transistor is connected to the feedback pin and the emitter is connected to the ground pin. When the voltage of the reference pin of the TL431 exceeds the internal reference voltage of 2.5V, the optocoupler diode current increases, pulling down the feedback voltage.
Vcc 5uA Vref 0.9mA
Vcc
15V 9V
Icc
10mA 60uA
t
Normal operation
OSC
Vo
Vfb
FB 4
Cfb
Fault situation
Normal operation
D1
D2 28R Vfb* R Gate Driver
Figure 18. Auto Restart Operation After Protection 3.1 Pulse-by-pulse Current Limit
431
VSD
OLP
Figure 17. Pulse Width Modulation (PWM) Circuit
As shown in Figure 17, the drain current of the power MOSFET is limited by the inverting input of PWM comparator (Vfb*). Assuming that the 0.9mA current source flows only through the internal resistor (28R +R= 2.9k), the cathode voltage of diode D2 is about 2.6V. Since D1 is blocked when the feedback voltage (Vfb) exceeds 2.6V, the maximum voltage of the cathode of D2 is 2.6V. Therefore, the maximum value of Vfb* is about 0.1V, which limits the peak value of the power MOSFET drain current.
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3.2 Over Load Protection (OLP)
Overload means that the load current exceeds a pre-set level due to an abnormal situation. In this situation, the protection circuit should be activated to protect the SMPS (Switch Mode Power Supplies). However, even when the SMPS is in normal operation, the over load protection circuit can be activated during the load transition. To avoid this undesired operation, the over load protection circuit is designed to be activated after a specified period 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 SMPS is limited, and therefore 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 opto-coupler diode which also reduces opto-coupler transistor current increasing Vfb. If Vfb exceeds 2.6V, D1 is blocked and the 5mA current source starts to charge Cfb slowly compared to when the 0.9mA current source charges Cfb. In this condition, Vfb continues increasing until it reaches 7.5V, and the switching operation is terminated at that time as shown in Figure 19. The delay time for shutdown is the time required to charge Cfb from 2.6V to 7.5V with 5mA. When Cfb is 10nF (103), T12 is approximately 9.8ms and when Cfb is 0.1mF (104), T12 is approximately 98ms. These values are enough to prevent SMPS from being shut down during transient situations.
switching. To avoid undesired activation of OVP during normal operation, Vcc should be properly designed to be below 25V.
3.4 Thermal Shutdown (TSD)
The thermal shutdown circuitry senses the junction temperature. The threshold is set at 160xC. When the junction temperature rises above this threshold (160xC), the power MOSFET is disabled.
4. Line UVLO and Sleep Mode
According to the voltage of the Line Sense pin, three operation modes are defined: normal operation mode, line under voltage lock out mode, and sleep mode, as shown in Figure 20. When the voltage of this pin is over 2.55V, FS6X-Series operates in normal mode. When the voltage of this pin is less than 2.55V, it goes into line under voltage lock out mode terminating switching operation. When the voltage of this pin is less than 1.8V, it enters into sleep mode. During sleep mode, the reference voltage generation circuit, including the shunt regulator, is disabled and only 300mA operation current is required.
VFB Over load protection
7.5V
Sleep ON OFF
Vin
3
Vcc good
Vcc
9V/15V
R1
VSL (1.8v) Line Sense 6 VLU (2.5V) Line UVLO Internal Bias
Enable Vref
2.6V
R2
T12= Cfb*(7.5-2.6)/Idelay
T1
T2
t
Figure 20. Line Sense Block
Figure 19. Over Load Protection 3.3 Over Voltage Protection (OVP)
In the case of a malfunction in the secondary side feedback circuit, or feedback loop open caused by a defect of solder, the current through the opto-coupler transistor becomes almost zero. Then, Vfb climbs up in a similar manner to the over load situation, forcing the preset maximum current to be supplied to the secondary side until the over load protection is activated. Because more than required energy is provided to the output, the output voltage may exceed the rated voltage before the over load 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 FS6X-Series uses Vcc instead of directly monitoring the output voltage. If VCC exceeds 25V, OVP circuit is activated resulting in termination of
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FS6X0420RJ/ FS6X0720RJ/ FS6X1220RJ Fairchild Power Switch (FPSTM)
Typical Application Circuit
Application
PoE Device
Output power
15W
Input voltage
36-72Vdc
Output voltage (Max current)
5V (3.0A)
Features
High switching frequency(300kHz) High power density Low component count Enhanced system reliability through various protection functions
Key Design Notes
Capacitor C104 is employed to reduce the noise on sensed line voltage. The delay time for over load protection is designed to be about 12ms with C103 of 22nF. If a faster triggering of OLP is required, C103 can be reduced to 10nF.
1. Schematic
R221 15 R222 R223 C221 15 15 1nF 50V C222 1nF 50V
C301 2.2nF 1kV DC Input Voltage: 36Vdc~72Vdc C101 47uF 100V R101 200k R102 100k
R301 10
T: 1 EPC19
D201 ST OS15L25G
C202 10nF 50V C203 10nF 50V
C204 10nF 50V
L201 2.2uH C205 330uF 16V
Output : 5V / 3A
C201 10nF 50V
C102 22uF 50V
D102 1N4148
R104 1
C104 1nF
3 6 L/S Vcc 1 R105 15k 5 Drain N.C 2 4 GND Vfb
D103 P6KE160CA
R210 1k IC201 FOD2741
R210 1k
IC101 FS6X1220R
C103 22nF 50V
C210 R212 10nF 30k 50V R214 18k
R213 18k
Figure 21. Demo Circuit
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2. Transformer
11
10
9
8
7
6
NVcc Np/2 Ns/2 Ns/1 Np/1 Np/1 Np/2 NVcc Ns/2 Ns/1
1
2
3
4
5
Figure 22. Transformer Schematic Diagram 3. Winding Specifications No
Np/1 Ns/1 Np/2 Nvcc
Pin (sf)
1 11 65 2 10 93
Wire
0.35 x 1 0.4 x 3 0.35 x 1 0.3 x 1
Turns
25 4 25 12
Winding Method
Center Winding Solenoid Winding Center Winding Center Winding
Insulation: Polyester Tape t = 0.050mm, 2Layers Insulation: Polyester Tape t = 0.050mm, 2Layers Insulation: Polyester Tape t = 0.050mm, 2Layers Insulation: Polyester Tape t = 0.050mm, 2Layers
4. Electrical Characteristics Parameter
Inductance Leakage Inductance
Pin
1,2 - 10,11 1,2 - 10,11
Specification
61uH 10% 8.8uH Max
Remarks
100kHz, 1V 2nd all short
5. Core & Bobbin
Core: EPC19 Bobbin: EPC19 Ae(mm2): 22.7
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6. Demo Circuit Part List
Part
R101 R102 R104 R105 R210 R201 R211 R212 R213 R214 R221 R222 R223 R301 D102 D103 D201 L201 -
Value
Resistor 200K 100K 1K 18K 40K 1K 1K 30K 18K 18K 15K 15K 15K 10K Diode 1N4148 P6KE160CA STPS15L25G Inductor 2.2uH -
Note
1/4W 1/4W 1/4W 1/4W 1/4W 1/4W 1/4W 1/4W 1/4W 1/4W 1/4W 1/4W 1/4W 1/4W -
Part
C101 C102 C103 C104 C201 C202 C203 C204 C205 C210 C221 C222 C301 IC101
Value
Capacitor 47uF/100V 22uF/50V 22uF/50V 1nF/50V 10uF/25V 10F/25V 10F/25V 10F/25V 330uF/16V 10nF/50V 1nF/50v 1nF/50v 2.2nF/1kv IC FS6X1220RJ FOD2741 -
Note
Electrolytic Capacitor Electrolytic Capacitor Ceramic Capacitor Ceramic Capacitor Ceramic Capacitor Ceramic Capacitor Ceramic Capacitor Ceramic Capacitor Electrolytic Capacitor Ceramic Capacitor Ceramic Capacitor Ceramic Capacitor Film FPSTM Optocoupler -
TVS -
IC201 -
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FS6X0420RJ/ FS6X0720RJ/ FS6X1220RJ Fairchild Power Switch (FPSTM)
Mechanical Dimensions
D2-Pak-6L Unit: mm
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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.
ACExTM FAST(R) ActiveArrayTM FASTrTM BottomlessTM FPSTM Build it NowTM FRFETTM CoolFETTM GlobalOptoisolatorTM CROSSVOLTTM GTOTM DOMETM HiSeCTM EcoSPARKTM I2CTM E2CMOSTM i-LoTM EnSignaTM ImpliedDisconnectTM FACTTM IntelliMAXTM FACT Quiet SeriesTM Across the board. Around the world.TM The Power Franchise(R) Programmable Active DroopTM
DISCLAIMER
ISOPLANARTM LittleFETTM MICROCOUPLERTM MicroFETTM MicroPakTM MICROWIRETM MSXTM MSXProTM OCXTM OCXProTM OPTOLOGIC(R) OPTOPLANARTM PACMANTM POPTM Power247TM PowerEdgeTM
PowerSaverTM PowerTrench(R) QFET(R) QSTM QT OptoelectronicsTM Quiet SeriesTM RapidConfigureTM RapidConnectTM SerDesTM ScalarPumpTM SILENT SWITCHER(R) SMART STARTTM SPMTM StealthTM SuperFETTM SuperSOTTM-3
SuperSOTTM-6 SuperSOTTM-8 SyncFETTM TCMTM TinyLogic(R) TINYOPTOTM TruTranslationTM UHCTM UltraFET(R) UniFETTM VCXTM WireTM
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. 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: 2. A critical component is any component of a life 1. Life support devices or systems are devices or support device or system whose failure to perform can systems which, (a) are intended for surgical implant into be reasonably expected to cause the failure of the life the body, or (b) support or sustain life, or (c) whose support device or system, or to affect its safety or failure to perform when properly used in accordance with instructions for use provided in the labeling, can be effectiveness. reasonably expected to result in significant injury to the user. PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Advance Information Product Status Formative or In Design First Production Definition This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. 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 in order to improve design. This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. This datasheet contains specifications on a product that has been discontinued by Fairchild semiconductor. The datasheet is printed for reference information only.
Rev. I18
Preliminary
No Identification Needed
Full Production
Obsolete
Not In Production
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