View FSCM0465R_1057690.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

FSCM0465R Green Mode Fairchild Power Switch (FPSTM)
June 2006
FSCM0465R Green Mode Fairchild Power Switch (FPSTM)
Features
Internal Avalanche Rugged SenseFET Low Start-up Current (max. 40A) 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)
Description
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.
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
FSCM0465RJ FSCM0465RJX FSCM0465RIWDTU(1) FSCM0465RGWDTU
(1)
Package
D2-PAK-6L D2-PAK-6L I2-PAK-6L TO-220-6L
Pb-Free Marking Code
Yes Yes Yes Yes CM0465R
BVDSS
RDS(ON) Max.
Packing Method
Tube Tape & Reel Tube Tube
650V
2.6
Note: 1. WDTU: Forming Type
FPSTM is a trademark of Fairchild Semiconductor Corporation.
(c) 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSCM0465R Rev. 1.0.1
1
FSCM0465R Green Mode Fairchild Power Switch (FPSTM)
Typical Circuit
DC OUT AC IN
Drain
PWM
Ilimit Vfb Vcc GND
FSCM0465R Rev. 00
Figure 1. Typical Flyback Application
Output Power Table
Product
FSCM0465RJ FSCM0565RJ FSCM0765RJ FSCM0465RI FSCM0465RG FSCM0565RG FSCM0765RG
230VAC 15%(3) Adapter
40W 50W 65W 60W 60W 70W 85W
(1)
85-265VAC
(2)
Open Frame
55W 65W 70W 70W 70W 85W 95W
Adapter
30W 40W 50W 40W 40W 60W 70W
(1)
Open Frame(2)
40W 50W 60W 50W 50W 70W 85W
Notes: 1. Typical continuous power in a non-ventilated enclosed adapter measured at 50C ambient 2. Maximum practical continuous power in an open-frame design at 50C ambient 3. 230 VAC or 100/115 VAC with doubler
(c) 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSCM0465R Rev. 1.0.1
2
FSCM0465R Green Mode Fairchild Power Switch (FPSTM)
Internal Block Diagram
N.C. 5
VCC 3 VCC Good Vref Internal Bias
Drain 1
0.3/0.5V
+
8V/12V
Freq. Modulation
VCC IDELAY VCC
OSC IFB
PWM 2.5R
S
Q Q
FB 4 6 I_limit
0.3K
R
R
Soft start
Gate Driver LEB
VSD VCC
S Q Q
2 GND
Vovp TSD VCC UV Reset Vcc Good
R
FSCM0465R Rev. 00
Figure 2. Functional Block Diagram of FSCM0465R
(c) 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSCM0465R Rev. 1.0.1
3
FSCM0465R Green Mode Fairchild Power Switch (FPSTM)
Pin Configuration
FSCM0465RJ D2-PAK-6L
6 : I_limit 5 : N.C. 4 : FB 3 : VCC 2 : GND 1 : Drain
FSCM0465RI I2-PAK-6L
6 : I_limit 5 : N.C. 4 : FB 3 : VCC 2 : GND 1 : Drain
FSCM0465RJ
FSCM0465RG TO-220-6L
FSCM0465RI
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
1 2 3
Pin Name
Drain GND VCC
Pin Function Description
SenseFET Drain. This pin is the high-voltage power SenseFET drain. It is designed to drive the transformer directly. Ground. This pin is the control ground and the SenseFET source. 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. 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. 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.
4
Feedback (FB)
5 6
N.C. I_limit
(c) 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSCM0465R Rev. 1.0.1
4
FSCM0465R Green Mode Fairchild Power Switch (FPSTM)
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. TA = 25C unless otherwise specified.
Symbol
BVDSS VDGR VGS IDM
Parameter
Drain-Source Breakdown Voltage Drain-Gate Voltage (RGS=1M) Gate-Source (GND) Voltage Drain Current Pulsed(2) Continuous Drain Current (TO-220-6L, I2-PAK-6L) TC = 25C TC = 100C TC = 25C TC = 100C
(1)
Value
650 650 30 16 4.0 2.5 2.3 1.4 20 -0.3 to VCC 140 -1.1 75 -1.5 80 -0.64 Internally limited -25 to +85 -55 to +150 2.0 (GND-Vfb = 1.5kV) (VCC-Vfb = 1.0kV) 300 (GND-Vfb = 250V) (VCC-Vfb = 100V)
Unit
V V V ADC ADC ADC ADC ADC V V W W/C W W/C W W/C C C C kV
ID
Continuous Drain Current (D2-PAK-6L) Supply Voltage Feedback Voltage Range Total Power Dissipation (TO-220-6L) Total Power Dissipation (I2-PAK-6L) Total Power Dissipation (D2-PAK-6L) Operating Junction Temperature Operating Ambient Temperature Storage Temperature ESD Capability, HBM Model (All pins except Vfb) ESD Capability, Machine Model (All pins except Vfb)
VCC VFB PD Derating PD Derating PD Derating TJ TA TSTG
V
Notes: 1. Tj = 25C to 150C 2. Repetitive rating: Pulse-width limited by maximum junction temperature 3. TC: Case back surface temperature with infinite heat sink
(c) 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSCM0465R Rev. 1.0.1
5
FSCM0465R Green Mode Fairchild Power Switch (FPSTM)
Electrical Characteristics
TA = 25C unless otherwise specified.
Symbol
SenseFET SECTION
IDSS RDS(ON) COSS td(on) tr td(off) tf fOSC fMOD tMOD fSTABLE fOSC DMAX DMIN VSTART VSTOP IFB tS/S VBURH VBURL ILIMIT VOVP TSD IDELAY VSD Istart IOP(MIN) IOP(MAX)
Parameter
Zero Gate Voltage Current Static Drain Source on Resistance(1) Output Capacitance Turn-on Delay Time Rise Time Turn-off Delay Time Fall Time Switching Frequency Switching Frequency Modulation Range Switching Frequency Modulation Cycle Switching Frequency Stability Switching Frequency Maximum Duty Cycle Minimum Duty Cycle UVLO Threshold Voltage Feedback Source Current Internal Soft-Start Time Variation(2)
Condition
VDS = Max, Rating VGS = 0V VGS = 10V, ID = 2.3A VGS = 0V, VDS = 25V, f = 1MHz
Min. Typ. Max. Unit
2.2 60 23 20 65 27 66 3 4 1 5 80 12 8 0.9 15 0.5 0.3 2.5 19 145 5.3 6 20 2.5 250 2.6 72 3 10 85 0 13 9 1.1 20 0.6 0.36 2.8 20 160 7 6.5 40 5 kHz kHz ms % % % % V V mA ms V V A V C A V A mA ns A pF
VDD = 325V, ID = 3.2A(4)
CONTROL SECTION
VCC = 14V, VFB = 5V 60 10V VCC 17V -25C TA +85C 0 75 VFB = GND VFB = GND 11 7 0.7 10 VCC = 14V VCC = 14V VCC = 14V, VFB = 5V 0.4 0.24 2.2 18 130 VFB = 4V VFB 5.5V 3.5 5.5 VCC = 10V, VFB = 0V VCC = 20V, VFB = 0V -
BURST MODE SECTION
Burst Mode Voltages
PROTECTION SECTION
Peak Current Limit(3) Over-Voltage Protection Thermal Shutdown Temperature(2) Shutdown Delay Current Shutdown Feedback Voltage Startup Current Operating Supply Current
TOTAL DEVICE SECTION
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. 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.
(c) 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSCM0465R Rev. 1.0.1
6
FSCM0465R Green Mode Fairchild Power Switch (FPSTM)
Comparison Between FSDM0465RB and FSCM0465R
Function
Frequency Modulation Pulse-by-pulse Current Limit Internal Startup Circuit N/A Internally fixed (2.0A max.) Available
FSDM0465RB
FSCM0465R
Available - Frequency modulation range (fMOD) = 3kHz - Frequency modulation cycle (tMOD) = 4ms Programmable using external resistor (2.8A max.) N/A (Requires a startup resistor) Startup current: 40A (max.) TO-220-6L I2-PAK-6L D2-PAK-6L
Packages
TO-220F-6L
(c) 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSCM0465R Rev. 1.0.1
7
FSCM0465R Green Mode Fairchild Power Switch (FPSTM)
Typical Performance Characteristics
These characteristic graphs are normalized at TA= 25C.
1.60 1.40 1.20 1.00 0.80 0.60 -50 -25 0 25 50 75 100 125 Junction Temperature [C] Stop Threshold Voltage (Normalized to 25C)
1.20 1.12 1.04 0.96 0.88 0.80 -50 -25 0 25 50 75 100 125
Start up Current (Normalized to 25C)
Junction Temperature [C]
Figure 4. Startup Current vs. Temp.
Figure 5. Stop Threshold voltage vs. Temp.
1.20 Maximum Duty Cycle (Normalized to 25C) 1.12 1.04 0.96 0.88 0.80 -50 -25 0 25 50 75 100 125 Start Threshold Voltage (Normalized to 25C)
1.20 1.12 1.04 0.96 0.88 0.80 -50 -25 0 25 50 75 100 125
Junction Temperature [C]
Junction Temperature [C]
Figure 6. Maximum Duty Cycle vs. Temp.
Figure 7. Start Threshold Voltage vs. Temp.
1.20 Initial Frequency (Normalized to 25C) FB Source Current (Normalized to 25C) 1.12 1.04 0.96 0.88 0.80 -50 -25 0 25 50 75 100 125
1.20 1.12 1.04 0.96 0.88 0.80 -50 -25 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.
(c) 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSCM0465R Rev. 1.0.1
8
FSCM0465R Green Mode Fairchild Power Switch (FPSTM)
Typical Performance Characteristics (Continued)
These characteristic graphs are normalized at TA= 25C.
1.20 1.12 1.04 0.96 0.88 0.80 -50 -25 0 25 50 75 100 125 Burst Mode Enable Voltage (Normalized to 25C) Shutdown FB Voltage (Normalized to 25C)
1.20 1.12 1.04 0.96 0.88 0.80 -50 -25 0 25 50 75 100 125
Junction Temperature [C]
Junction Temperature [C]
Figure 10. Shutdown Feedback voltage vs. Temp.
Figure 11. Burst Mode Enable Voltage vs. Temp.
1.20 Shutdown Delay Current (Normalized to 25C) Maximum Drain Current (Normalized to 25C) 1.12 1.04 0.96 0.88 0.80 -50 -25 0 25 50 75 100 125
1.20 1.12 1.04 0.96 0.88 0.80 -50 -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 Burst Mode Disable Voltage (Normalized to 25C) 1.12 1.04 0.96 0.88 0.80 -50 -25 0 25 50 75 100 125 Operating Supply Current (Normalized to 25C)
1.20 1.12 1.04 0.96 0.88 0.80 -50 -25 0 25 50 75 100 125
Junction Temperature [C]
Junction Temperature [C]
Figure 14. Burst Mode Disable Voltage vs. Temp.
Figure 15. Operating Supply Current vs. Temp.
(c) 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSCM0465R Rev. 1.0.1
9
FSCM0465R Green Mode Fairchild Power Switch (FPSTM)
Functional Description
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 20A) 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).
The minimum current supplied through the startup resistor is given by:
Isup min =
(
2 Vline min - Vstar t
)
1 Rstr
(1)
where Vlinemin is the minimum input voltage, Vstart is the start voltage (12V) and Rstr is the startup resistor. The startup resistor should be chosen so that Isupmin is larger than the maximum startup current (40A). If not, VCC can not be charged to the start voltage and FPS fails to start.
CDC
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) ISUP Rstr Da
VCC FSCM0465R ICC Ca
FSCM0465R Rev. 00
Figure 16. Startup Circuit
ICC
ILIM =
RLIM 2.5 A 2.8K + RLIM
(2)
Vcc Idelay
Vref IFB 0.9mA
OSC
3mA
Vo
H11A817A
Vfb
4
CB
SenseFET
D1 0.3k
D2 2.5R + Vfb* Gate driver
Power Down 25A
FSCM0465R Rev. 00
Power Up
KA431
R
6 RLI M
-
VCC Vstop=8V Vstart=12V Vz
FSCM0465R Rev. 00
VSD
OLP
Rsense
Figure 17. Relation Between Operating Supply Current and VCC Voltage
Figure 18. Pulse Width Modulation (PWM) Circuit
(c) 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSCM0465R Rev. 1.0.1
10
FSCM0465R Green Mode Fairchild Power Switch (FPSTM)
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:
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. 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 20A) 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).
Fault occurs
Ilim_spec x Vdc x Ry
Na Np
Ifb x Ilim_comp
(3)
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 Ilim_comp is the current difference which must be eliminated. In case of capacitor in the circuit 1F, 100V is good choice for all applications.
Vds
Power On
Fault removed
VDC
Np
Vcc
L
12V 8V
Vfb
Drain Na Vcc
FSCM0465R Rev. 00
t
Normal Operation Fault Situation Normal Operation
I_lim RLIM
GND
compensation network
-
Figure 20. Auto Restart 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
RY
FSCM0465R Rev. 00
CY
+
Vy = VDC x
Na Np
Figure 19. Constant power limit circuit
(c) 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSCM0465R Rev. 1.0.1
11
FSCM0465R Green Mode Fairchild Power Switch (FPSTM)
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 5.3A 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 5.3A (Idelay). A 10 ~ 50ms delay time is typical for most applications.
VFB
FSCM0465R Rev. 00
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 145C, the thermal protection is triggered, resulting in shutdown of the FPS. 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
Overload Protection
6.0V
Ts
Ts
2.5V
T12= CB*(6.0-2.5)/Idelay T1 T2
Ts fs
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
4ms
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.
(c) 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSCM0465R Rev. 1.0.1
12
FSCM0465R Green Mode Fairchild Power Switch (FPSTM)
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
(c) 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSCM0465R Rev. 1.0.1
13
FSCM0465R Green Mode Fairchild Power Switch (FPSTM)
Typical Application Circuit
Application
LCD Monitor
Output Power
40W
Input Voltage
Universal Input (85-265Vac)
Output Voltage (Max. Current)
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 1 R103 56k 2W C104 3.3nF 630V D202 MBRF10H100 10 C201 1000F 25V 8 L201 12V / 3.0A C202 1000F 25V
2 D101 UF 4007 L101 Ferrite Bead 3
C103 100F 400V BD101 2KBP06M 1 2
IC101 FSCM0465R 3 6 Ilimit Drain 1 D102 UF4004 D201 MBRF1060 R104 20 4 7 C203 1000F 10V 5 6 L202 5V / 2.8A C204 1000F 10V
4 C102 220nF 275VAC C106 100nF 50V
4
FB
VCC 3 GND 2 C105 22F 50V
LF101 23mH
C301 4.7nF R107 330k R108 330k R201 1k
R101 560k 0.5W
R202 1.2k IC301 H11A817A
R204 5.6k R203 10k C205 47nF
RT101 5D-9
C101 220nF 275VAC
F101 FUSE 250V 2A
IC201 KA431
R205 5.6k
FSCM0465R Rev. 01
Figure 24. Demo Circuit
(c) 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSCM0465R Rev. 1.0.1
14
FSCM0465R Green Mode Fairchild Power Switch (FPSTM)
2. Transformer
EER3016 Np/2 Np/2 1 10 N 9 8 7 6
12V
2 3 4
N5V
Na 5
Figure 25. Transformer Schematic Diagram
3. Winding Specification No
Na Np/2 N12V N5V Np/2
Pin (sf)
45 21 10 8 76 32
Wire
0.2 x1
Turns
8 18 7 3 18
Winding Method
Center Winding Solenoid Winding Center Winding Center Winding Solenoid Winding
Insulation: Polyester Tape t = 0.050mm, 2 Layers 0.4 x 1 0.3 x 3 0.3 x 3 0.4 x 1 Insulation: Polyester Tape t = 0.050mm, 2 Layers Insulation: Polyester Tape t = 0.050mm, 2 Layers Insulation: Polyester Tape t = 0.050mm, 2 Layers Outer Insulation: Polyester Tape t = 0.050mm, 2 Layers
4. Electrical Characteristics Pin
Inductance Leakage Inductance 1-3 1-3
Specification
520H 10% 10H Max
Remarks
100kHz, 1V 2nd all Short
5. Core & Bobbin
Core: EER 3016 Bobbin: EER3016 Ae(mm2): 96
(c) 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSCM0465R Rev. 1.0.1
15
FSCM0465R Green Mode Fairchild Power Switch (FPSTM)
6. Demo Circuit Part List Part
F101 RT101 R101 R103 R104 R107 R108 R201 R202 R203 R204 R205
Value Fuse
2A/250V
Note
Part
C301
Value
4.7nF
Note
Polyester Film Cap.
NTC
5D-9 L201 5H 5H
Inductor
Wire 1.2mm Wire 1.2mm L202 0.5W 2W 1/4W 1/4W 1/4W 1/4W 1/4W 1/4W 1/4W 1/4W BD101 D101 D102 D201 D202 UF4007 UF4004 MBRF1060 MBRF10H100
Resistor
560k 56k 20 330k 330k 1k 1.2k 10k 5.6k 5.6k
Diode
Bridge Diode
2KBP06M 3N257 Bridge Diode
Capacitor
C101 C102 C103 C104 C105 C106 C201 C202 C203 C204 C205 220nF/275VAC 220nF/275VAC 100F/400V 3.3nF/630V 22F/50V 100nF/50V 1000F/25V 1000F/25V 1000F/10V 1000F/10V 47nF/50V Box Capacitor Box Capacitor Electrolytic Capacitor Ceramic Capacitor Electrolytic Capacitor Ceramic Capacitor Electrolytic Capacitor Electrolytic Capacitor Electrolytic Capacitor Electrolytic Capacitor Ceramic Capacitor IC101 IC201 IC301 FSCM0465R KA431(TL431) H11A817A LF101 23mH
Line Filter
Wire 0.4mm
IC
FPSTM (2.5A, 650V) Voltage Reference Opto-coupler
(c) 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSCM0465R Rev. 1.0.1
16
FSCM0465R Green Mode Fairchild Power Switch (FPSTM)
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
MAX0.80 0.70 0.50
10.00 MIN 4.00
2.19 1.27
1.75
MIN 0.85 2.19 1.27
3.81
1.75
10.20 9.80 (8.58) (4.40) R0.45
B 4.70 4.30 1.40 1.25
(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
(c) 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSCM0465R Rev. 1.0.1
17
FSCM0465R Green Mode Fairchild Power Switch (FPSTM)
Package Dimensions (Continued)
I2-PAK-6L (Forming)
Dimensions are in millimeters unless otherwise specified.
MKT-TO262A6
(c) 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSCM0465R Rev. 1.0.1
18
FSCM0465R Green Mode Fairchild Power Switch (FPSTM)
Package Dimensions (Continued)
TO-220-6L (Forming)
Dimensions are in millimeters unless otherwise specified.
(c) 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSCM0465R Rev. 1.0.1
19
FSCM0465R Green Mode Fairchild Power Switch (FPSTM)
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) FASTrTM ActiveArrayTM FPSTM BottomlessTM FRFETTM Build it NowTM GlobalOptoisolatorTM CoolFETTM CROSSVOLTTM GTOTM HiSeCTM DOMETM I2CTM EcoSPARKTM 2 i-LoTM E CMOSTM EnSignaTM ImpliedDisconnectTM FACTTM IntelliMAXTM FACT Quiet SeriesTM Across the board. Around the world.TM The Power Franchise(R) Programmable Active DroopTM
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 UniFETTM UltraFET(R) VCXTM WireTM
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, 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.
2.
A critical component is 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
Advance Information
Product Status
Formative or In Design
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 to improve design. This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice 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.
Preliminary
First Production
No Identification Needed
Full Production
Obsolete
Not In Production
Rev. I19
(c) 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSCM0465R Rev. 1.0.1
20

▲Up To Search▲

Price & Availability of FSCM0465R

	To Download FSCM0465R Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .