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FSL126MRTWDTU

FSL126MRTWDTU

  • 厂商:

    ONSEMI(安森美)

  • 封装:

    TO220-6

  • 描述:

    IC OFF-LINE SWITCH PWM TO220-6

  • 数据手册
  • 价格&库存
FSL126MRTWDTU 数据手册
Is Now Part of To learn more about ON Semiconductor, please visit our website at www.onsemi.com Please note: As part of the Fairchild Semiconductor integration, some of the Fairchild orderable part numbers will need to change in order to meet ON Semiconductor’s system requirements. Since the ON Semiconductor product management systems do not have the ability to manage part nomenclature that utilizes an underscore (_), the underscore (_) in the Fairchild part numbers will be changed to a dash (-). This document may contain device numbers with an underscore (_). Please check the ON Semiconductor website to verify the updated device numbers. The most current and up-to-date ordering information can be found at www.onsemi.com. Please email any questions regarding the system integration to Fairchild_questions@onsemi.com. ON Semiconductor and the ON Semiconductor logo are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. FSL126MRT Green-Mode Fairchild Power Switch (FPS™) Features Description  Internal Avalanched Rugged 650V SenseFET  Advanced Soft Burst-Mode Operation for Low The FSL126MRT is an integrated Pulse Width Modulation (PWM) controller and SenseFET specifically designed for offline Switch-Mode Power Supplies (SMPS) with minimal external components. The PWM controller includes an integrated fixed-frequency oscillator, Under-Voltage Lockout (UVLO), LeadingEdge Blanking (LEB), optimized gate driver, internal soft-start, temperature-compensated precise current sources for loop compensation, and self-protection circuitry. Compared with a discrete MOSFET and PWM controller solution, the FSL126MRT can reduce total cost, component count, size, and weight; while simultaneously increasing efficiency, productivity, and system reliability. This device provides a basic platform suited for cost-effective design of a flyback converter. Standby Power and Low Audible Noise  Random Frequency Fluctuation for Low EMI  Pulse-by-Pulse Current Limit  Various Protection Functions: Overload Protection (OLP), Over-Voltage Protection (OVP), Abnormal Over-Current Protection (AOCP), Internal Thermal Shutdown (TSD) with Hysteresis and Under-Voltage Lockout (UVLO) with Hysteresis  Low Operating Current(0.4mA) in Burst Mode  Internal Startup Circuit  Built-in Soft-Start: 15ms  Auto-Restart Mode Applications  Power Supply for STB Home Appliances, and DVD Combination Ordering Information (2) Output Power Table Part Number FSL126MRT Package TO-220F (1) 6-Lead W-Forming Operating Current RDS(ON) Junction Limit (Max.) Temperature -40°C ~ +125°C 1.2A 6.2Ω 230VAC ± 15%(3) (4) Adapter 30W 85~265VAC Replaces Device Open Open (4) (5) Adapter (5) Frame Frame 40W 17W 25W KA5M0265RYDTU Notes: 1. Pb-free package per JEDEC J-STD-020B. 2. The junction temperature can limit the maximum output power. 3. 230VAC or 100/115VAC with voltage doubler. 4. Typical continuous power in a non-ventilated enclosed adapter measured at 50°C ambient temperature. 5. Maximum practical continuous power in an open-frame design at 50°C ambient temperature. © 2012 Fairchild Semiconductor Corporation FSL126MRT • Rev. 1.0.0 www.fairchildsemi.com FSL126MRT — Green-Mode Fairchild Power Switch (FPS™) May 2012 FSL126MRT — Green-Mode Fairchild Power Switch (FPS™) Application Circuit VO AC IN VSTR Drain GND VCC FB Figure 1. Typical Application Circuit Internal Block Diagram VSTR VCC Drain 6 3 1 Vburst ICH 0.40V / 0.55V Soft Burst VREF VCC Good 7.5V / 12V Random VCC VREF 2.0µA IDELAY FB Soft-Start 90µA IFB OSC PWM 4 S Q R Q Gate Driver 3R R NC LEB (350ns) 5 VAOCP VSD TSD S Q R Q 2 GND 7.0V VCC VCC Good VOVP 24.5V Figure 2. © 2012 Fairchild Semiconductor Corporation FSL126MRT • Rev. 1.0.0 Internal Block Diagram www.fairchildsemi.com 2 Figure 3. Pin Configuration (Top View) Pin Definitions Pin # Name 1 Drain SenseFET Drain. High-voltage power SenseFET drain connection. 2 GND Ground. This pin is the control ground and the SenseFET source. 3 VCC Power Supply. This pin is the positive supply input, which provides the internal operating current for both startup and steady-state operation. 4 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 7V, the overload protection triggers, which shuts down the FPS. 5 NC No Connection VSTR Startup. This pin is connected directly, or through a resistor, to the high-voltage DC link. At startup, 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 (ICH) is disabled. 6 Description © 2012 Fairchild Semiconductor Corporation FSL126MRT • Rev. 1.0.0 FSL126MRT — Green-Mode Fairchild Power Switch (FPS™) Pin Configuration www.fairchildsemi.com 3 Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Symbol Parameter Min. Max. Unit VSTR VSTR Pin Voltage 650 V VDS Drain Pin Voltage 650 V VCC VCC Pin Voltage 26 V VFB Feedback Pin Voltage 10.0 V -0.3 (6) IDM Drain Current Pulsed 8 A IDS Continuous Switching Drain Current 2 A 73 mJ 50 W EAS PD TJ TSTG (7) Single Pulsed Avalanche Energy Total Power Dissipation (TC=25°C) (8) Maximum Junction Temperature 150 °C Operating Junction Temperature(9) -40 +125 °C Storage Temperature -55 +150 °C Notes: 6. Repetitive peak switching current when the inductive load is assumed: Limited by maximum duty (DMAX=0.74) and junction temperature (see Figure 4). 7. L=45mH, starting TJ=25°C. 8. Infinite cooling condition (refer to the SEMI G30-88). 9. Although this parameter guarantees IC operation, it does not guarantee all electrical characteristics. Figure 4. FSL126MRT — Green-Mode Fairchild Power Switch (FPS™) Absolute Maximum Ratings Repetitive Peak Switching Current ESD Capability Symbol ESD Parameter Value Human Body Model, JESD22-A114 5 Charged Device Model, JESD22-C101 2 Unit KV Thermal Impedance TA=25°C unless otherwise specified. Symbol Parameter (10) Value Unit θJA Junction-to-Ambient Thermal Impedance 63.5 °C/W θJC Junction-to-Case Thermal Impedance(11) 2.9 °C/W Notes: 10. Free standing without heat sink under natural convection condition, per JEDEC 51-2 and 1-10. 11. Infinite cooling condition per Mil Std. 883C method 1012.1. © 2012 Fairchild Semiconductor Corporation FSL126MRT • Rev. 1.0.0 www.fairchildsemi.com 4 TJ = 25°C unless otherwise specified. Symbol Parameter Condition Min. Typ. Max. Unit SenseFET Section BVDSS Drain-Source Breakdown Voltage VCC=0V, ID=250μA IDSS Zero-Gate-Voltage Drain Current VDS=520V, TA=125°C RDS(ON) 650 V 250 Drain-Source On-State Resistance VGS=10V, ID=1A 4.9 CISS Input Capacitance(12) VDS=25V, VGS=0V, f=1MHz 210 pF COSS Output Capacitance(12) VDS=25V, VGS=0V, f=1MHz 33.3 pF CRSS (12) 6.2 μA Ω Reverse Transfer Capacitance VDS=25V, VGS=0V, f=1MHz 4.1 pF tr Rise Time VDS=325V, ID=2A, RG=25Ω 16.4 ns tf Fall Time VDS=325V, ID=2A, RG=25Ω 23 ns td(on) Turn-On Delay VDS=325V, ID=2A, RG=25Ω 23 ns td(off) Turn-Off Delay VDS=325V, ID=2A, RG=25Ω 17.2 ns Control Section fS ΔfS Switching Frequency(12) VCC=14V, VFB=4V (12) 61 67 73 kHz ±5 ±10 % 61 67 73 % Switching Frequency Variation -25°C < TJ < 125°C DMAX Maximum Duty Ratio VCC=14V, VFB=4V DMIN Minimum Duty Ratio VCC=14V, VFB=0V 0 % Feedback Source Current VFB=0 65 90 115 μA VFB=0V, VCC Sweep 11 12 13 V After Turn-on, VFB=0V 7.0 7.5 8.0 V IFB VSTART VSTOP tS/S UVLO Threshold Voltage Internal Soft-Start Time VCC Sweep 15 FSL126MRT — Green-Mode Fairchild Power Switch (FPS™) Electrical Characteristics ms Burst-Mode Section VBURH VBURL Burst-Mode Voltage VCC=14V, VFB Sweep 0.46 0.55 0.66 0.33 0.40 0.48 Hys 150 V V mV Protection Section ILIM Peak Drain Current Limit di/dt=300mA/μs 1.05 1.20 1.34 A VSD Shutdown Feedback Voltage VCC=14V, VFB Sweep 6.45 7.00 7.55 V Shutdown Delay Current VCC=14V, VFB=4V 1.2 2.0 2.8 μA IDELAY tLEB Leading-Edge Blanking Time(12,14) VOVP Over-Voltage Protection TSD Hys Thermal Shutdown Temperature(12) 350 ns VCC Sweep 23.0 24.5 26.0 V Shutdown Temperature 130 140 150 °C Hysteresis 60 °C Continued on the following page… © 2012 Fairchild Semiconductor Corporation FSL126MRT • Rev. 1.0.0 www.fairchildsemi.com 5 TJ = 25°C unless otherwise specified. Symbol Parameter Condition Min. Typ. Max. Unit 0.3 0.4 0.5 mA 1.00 1.35 mA Total Device Section IOP Operating Supply Current, (Control Part in Burst Mode) VCC=14V, VFB=0V IOPS Operating Switching Current, (Control Part and SenseFET Part) VCC=14V, VFB=2V Start Current VCC=11V (Before VCC Reaches VSTART) 85 120 155 μA Startup Charging Current VCC=VFB=0V, VSTR=40V 0.7 1.0 1.3 mA Minimum VSTR Supply Voltage VCC=VFB=0V, VSTR Sweep ISTART ICH VSTR 26 V Notes: 12. Although these parameters are guaranteed, they are not 100% tested in production. 13. Average value. 14. tLEB includes gate turn-on time. Comparison of KA5M0265R and FSL126MRT Function KA5M0265RYDTU FSL126MRT Random Frequency Fluctuation N/A Built-in Operating Current 7mA 0.4mA High-Voltage Startup Circuit N/A Built-in OLP Protections OVP TSD Power Balance © 2012 Fairchild Semiconductor Corporation FSL126MRT • Rev. 1.0.0 Long tCLD Advantages of FSL126MRT Low EMI FSL126MRT — Green-Mode Fairchild Power Switch (FPS™) Electrical Characteristics (Continued) Very low stand-by power OLP OVP AOCP Enhanced protections and high reliability TSD with Hysteresis Very Short tCLD The difference of input power between the low and high input voltage is quite small. www.fairchildsemi.com 6 1.40 1.40 1.30 1.30 1.20 1.20 1.10 1.10 Normalized Normalized Characteristic graphs are normalized at TA=25°C. 1.00 0.90 0.80 1.00 0.90 0.80 0.70 0.70 0.60 -40'C -20'C 0.60 -40'C -20'C 0'C 0'C 25'C 50'C 75'C 90'C 110'C 120'C 12 Temperature [ °C] Temperature [ °C] Operating Supply Current (IOP) vs. TA Figure 6. 1.40 1.40 1.30 1.30 1.20 1.20 1.10 1.10 Normalized Normalized Figure 5. 1.00 0.90 0.80 0.70 Operating Switching Current (IOPS) vs. TA 1.00 0.90 0.80 0.70 0.60 -40'C -20'C 0'C 0.60 25'C 50'C 75'C 90'C 110'C 120'C 12 -40'C -20'C 0'C Temperature [ °C] Figure 7. Startup Charging Current (ICH) vs. TA Figure 8. 1.40 1.40 1.30 1.30 1.20 1.20 1.10 1.10 1.00 0.90 0.80 0.70 Peak Drain Current Limit (ILIM) vs. TA 1.00 0.90 0.80 0.70 0.60 -40'C -20'C 0'C 0.60 25'C 50'C 75'C 90'C 110'C 120'C 125'C -40'C -20'C Temperature [ °C] Figure 9. 25'C 50'C 75'C 90'C 110'C 120'C 12 Temperature [ °C] Normalized Normalized 25'C 50'C 75'C 90'C 110'C 120'C 125'C FSL126MRT — Green-Mode Fairchild Power Switch (FPS™) Typical Performance Characteristics 25'C 50'C 75'C 90'C 110'C 120'C 12 Temperature [ °C] Feedback Source Current (IFB) vs. TA © 2012 Fairchild Semiconductor Corporation FSL126MRT • Rev. 1.0.0 0'C Figure 10. Shutdown Delay Current (IDELAY) vs. TA www.fairchildsemi.com 7 1.40 1.40 1.30 1.30 1.20 1.20 1.10 1.10 Normalized Normalized Characteristic graphs are normalized at TA=25°C. 1.00 0.90 0.80 0.70 1.00 0.90 0.80 0.70 0.60 -40'C -20'C 0'C 0.60 25'C 50'C 75'C 90'C 110'C 120'C 125 -40'C -20'C 0'C Temperature [ °C] Temperature [ °C] UVLO Threshold Voltage (VSTART) vs. TA Figure 12. 1.40 1.40 1.30 1.30 1.20 1.20 1.10 1.10 Normalized Normalized Figure 11. 1.00 0.90 0.80 UVLO Threshold Voltage (VSTOP) vs. TA 1.00 0.90 0.80 0.70 0.70 0.60 0.60 -40'C -20'C 0'C -40'C -20'C 25'C 50'C 75'C 90'C 110'C 120'C 12 0'C Figure 13. Shutdown Feedback Voltage (VSD) vs. TA Figure 14. 1.40 1.30 1.30 1.20 1.20 1.10 1.10 Normalized 1.40 1.00 0.90 0.80 0.70 25'C 50'C 75'C 90'C 110'C 120'C 125 Temperature [ °C] Temperature [ °C] Normalized 25'C 50'C 75'C 90'C 110'C 120'C 125 FSL126MRT — Green-Mode Fairchild Power Switch (FPS™) Typical Performance Characteristics Over-Voltage Protection (VOVP) vs. TA 1.00 0.90 0.80 0.70 0.60 0.60 -40'C -20'C 0'C 25'C 50'C 75'C 90'C 110'C 120'C 125 -40'C -20'C Temperature [ °C] Figure 15. 25'C 50'C 75'C 90'C 110'C 120'C 125 Temperature [ °C] Switching Frequency (fS) vs. TA © 2012 Fairchild Semiconductor Corporation FSL126MRT • Rev. 1.0.0 0'C Figure 16. Maximum Duty Ratio (DMAX) vs. TA www.fairchildsemi.com 8 3. Feedback Control: This device employs CurrentMode control, as shown in Figure 18. An opto-coupler (such as the FOD817) 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, pulling down the feedback voltage and reducing drain current. This typically occurs when the input voltage is increased or the output load is decreased. 1. Startup: At startup, an internal high-voltage current source supplies the internal bias and charges the external capacitor (CVCC) connected to the VCC pin, as illustrated in Figure 17. When VCC reaches 12V, the FSL126MRT begins switching and the internal highvoltage current source is disabled. Normal switching operation continues and the power is supplied from the auxiliary transformer winding unless VCC goes below the stop voltage of 7.5V. 3.1 Pulse-by-Pulse Current Limit: Because CurrentMode control is employed, the peak current through the SenseFET is limited by the inverting input of PWM comparator (VFB*), as shown in Figure 18. Assuming that the 90μA current source flows only through the internal resistor (3R + R =27kΩ), the cathode voltage of diode D2 is about 2.4V. Since D1 is blocked when the feedback voltage (VFB) exceeds 2.4V, the maximum voltage of the cathode of D2 is clamped at this voltage. Therefore, the peak value of the current through the SenseFET is limited. Figure 17. 3.2 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 leads to incorrect feedback operation in the Current-Mode PWM control. To counter this effect, the leading-edge blanking (LEB) circuit inhibits the PWM comparator for tLEB (350ns) after the SenseFET is turned on. Startup Block 2. Soft-Start: The internal soft-start circuit increases PWM comparator inverting input voltage, together with the SenseFET current, slowly after startup. 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 the transformers, inductors, and capacitors. The voltage on the output capacitors is progressively increased to smoothly establish the required output voltage. This helps prevent transformer saturation and reduces stress on the secondary diode during startup. Figure 18. © 2012 Fairchild Semiconductor Corporation FSL126MRT • Rev. 1.0.0 FSL126MRT — Green-Mode Fairchild Power Switch (FPS™) Functional Description Pulse Width Modulation Circuit www.fairchildsemi.com 9 B VDS B Fault occurs Power on Fault removed Figure 20. 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 minimum turn-on time. Even though the FSL126MRT has overload protection, it is not enough to protect in that abnormal case; due to the severe current stress imposed on the SenseFET until OLP is triggered. The internal AOCP circuit is shown in Figure 21. 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 S-R latch, resulting in the shutdown of the SMPS. VCC 12.0V 7.5V t Normal operation Figure 19. Fault situation Overload Protection Normal operation FSL126MRT — Green-Mode Fairchild Power Switch (FPS™) increasing until it reaches 7.0V, when the switching operation is terminated, as shown in Figure 20. The delay for shutdown is the time required to charge CFB from 2.4V to 7.0V with 2.0µA. This protection is implemented in Auto-Restart Mode. 4. Protection Circuits: The FSL126MRT has several self-protective functions, such as Overload Protection (OLP), Abnormal Over-Current Protection (AOCP), Over-Voltage Protection (OVP), and Thermal Shutdown (TSD). All the protections are implemented as autorestart. Once the fault condition is detected, switching is terminated and the SenseFET remains off. This causes VCC to fall. When VCC falls to the Under-Voltage Lockout (UVLO) stop voltage of 7.5V, the protection is reset and the startup circuit charges the VCC capacitor. When VCC reaches the start voltage of 12.0V, the FSL126MRT 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, reliability is improved without increasing cost. 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 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 SenseFET is limited and, therefore, the maximum input power is restricted with a given input voltage. If the output consumes more than this maximum power, the output voltage (VOUT) decreases below the set voltage. This reduces the current through the opto-coupler LED, which also reduces the opto-coupler transistor current, increasing the feedback voltage (VFB). If VFB exceeds 2.4V, D1 is blocked and the 2.0µA current source starts to charge CFB slowly up. In this condition, VFB continues © 2012 Fairchild Semiconductor Corporation FSL126MRT • Rev. 1.0.0 Figure 21. Abnormal Over-Current Protection www.fairchildsemi.com 10 6. Random Frequency Fluctuation (RFF): Fluctuating switching frequency of an SMPS can reduce EMI by spreading the energy over a wide frequency range. The amount of EMI reduction is directly related to the switching frequency variation, which is limited internally. The switching frequency is determined randomly by external feedback voltage and an internal free-running oscillator at every switching instant. This random frequency fluctuation scatters the EMI noise around typical switching frequency (67kHz) effectively and can reduce the cost of the input filter included to meet the EMI requirements (e.g. EN55022). 4.5 Thermal Shutdown (TSD): The SenseFET and the control IC on a die in one package makes it easier for the control IC to detect the over temperature of the SenseFET. If the temperature exceeds 140°C, the thermal shutdown is triggered and stops operation. The FSL126MRT operates in Auto-Restart Mode until the temperature decreases to around 80°C, when normal operation resumes. Figure 23. 5. Soft Burst-Mode Operation: To minimize power dissipation in Standby Mode, the FSL126MRT enters Burst-Mode operation. As the load decreases, the feedback voltage decreases. The device automatically enters Burst Mode when the feedback voltage drops below VBURL (400mV), as shown in Figure 22. 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 alternately enables and disables switching of the SenseFET, reducing switching loss in Standby Mode. Figure 22. Random Frequency Fluctuation FSL126MRT — Green-Mode Fairchild Power Switch (FPS™) 4.4 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 is triggered. Because more energy than required is provided to the output, the output voltage may exceed the rated voltage before the overload protection is triggered, resulting in the breakdown of the devices in the secondary side. To prevent this situation, an OVP circuit is employed. In general, the VCC is proportional to the output voltage and the FS136MRT uses VCC instead of directly monitoring the output voltage. If VCC exceeds 24.5V, an OVP circuit is triggered, resulting in the termination of the switching operation. To avoid undesired activation of OVP during normal operation, VCC should be designed to be below 24.5V. Burst-Mode Operation © 2012 Fairchild Semiconductor Corporation FSL126MRT • Rev. 1.0.0 www.fairchildsemi.com 11 10.16 9.96 2.74 2.34 (7.00) 3.40 3.20 (0.70) Ø3.28 3.08 (5.40) 16.07 15.67 6.90 6.50 20.00 19.00 (13.05) 24.00 23.00 (0.48) R0.55 R0.55 8.13 1.40 7.13 1.20 (1.13) 3.06 2.46 (7.15) 0.80 0.70 1 0.70 0.50 6 2.19 2,4,6 1,3,5 0.60 0.45 1.75 FSL126MRT — Green-Mode Fairchild Power Switch (FPS™) Physical Dimensions 3.48 2.88 1.27 3.81 5° 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) LEADFORM OPTION A E) DFAWING FILENAME: TO220A06REV4 5° Figure 24. TO-220F-6L (W-Forming) Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/. © 2012 Fairchild Semiconductor Corporation FSL126MRT • Rev. 1.0.0 www.fairchildsemi.com 12 FSL126MRT — Green-Mode Fairchild Power Switch (FPS™) © 2012 Fairchild Semiconductor Corporation FSL126MRT • Rev. 1.0.0 www.fairchildsemi.com 13 ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor 19521 E. 32nd Pkwy, Aurora, Colorado 80011 USA Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada Fax: 303−675−2176 or 800−344−3867 Toll Free USA/Canada Email: orderlit@onsemi.com © Semiconductor Components Industries, LLC N. American Technical Support: 800−282−9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81−3−5817−1050 www.onsemi.com 1 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative www.onsemi.com
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