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FSL136MR

FSL136MR

  • 厂商:

    MURATA-PS(村田)

  • 封装:

    DIP8

  • 描述:

    FSL136MR 集成了脉宽调制 (PWM) 控制器和 SenseFET,专门为高性能离线开关模式电源 (SMPS) 而设计,且外部部件数量极小。FSL136MR 包含了集成式高电压电源开关稳压器,将...

  • 数据手册
  • 价格&库存
FSL136MR 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. FSL136MR Green Mode Fairchild Power Switch (FPS™) Features Description ƒ ƒ The FSL136MR integrated Pulse Width Modulator (PWM) and SenseFET is specifically designed for highperformance offline Switch-Mode Power Supplies (SMPS) with minimal external components. FSL136MR includes integrated high-voltage power switching regulators that combine an avalanche-rugged SenseFET with a current-mode PWM control block. Internal Avalanche-Rugged SenseFET (650V) Under 50mW Standby Power Consumption at 265VAC, No-load Condition with Burst Mode ƒ Precision Fixed Operating Frequency with Frequency Modulation for Attenuating EMI ƒ ƒ ƒ ƒ Internal Startup Circuit ƒ ƒ ƒ ƒ Built-in Soft-Start: 15ms Pulse-by-Pulse Current Limiting Various Protections: Over-Voltage Protection (OVP), Overload Protection (OLP), Output-Short Protection (OSP), Abnormal Over-Current Protection (AOCP), Internal Thermal Shutdown Function with Hysteresis (TSD) Auto-Restart Mode Under-Voltage Lockout (UVLO) Low Operating Current: 1.8mA Adjustable Peak Current Limit The integrated PWM controller includes: Under-Voltage Lockout (UVLO) protection, Leading-Edge Blanking (LEB), a frequency generator for EMI attenuation, an optimized gate turn-on/turn-off driver, Thermal Shutdown (TSD) protection, and temperaturecompensated precision current sources for loop compensation and fault protection circuitry. The FSL136MR offers good soft-start performance. When compared to a discrete MOSFET and controller or RCC switching converter solution, the FSL136MR reduces total component count, design size, and weight; while increasing efficiency, productivity, and system reliability. This device provides a basic platform that is well suited for the design of cost-effective flyback converters. Applications ƒ ƒ ƒ Maximum Output Power(1) SMPS for VCR, STB, DVD, & DVCD Players (2) 230VAC ± 15% SMPS for Home Appliance (3) Adapter Adapter 19W Related Resources Open Frame 26W 85-265VAC (3) Adapter 14W Open Frame 20W Notes: ƒ AN-4137 — Design Guidelines for Off-line Flyback Converters using FPS™ ƒ AN-4141 — Troubleshooting and Design Tips for Fairchild Power Switch (FPS™) Flyback Applications ƒ AN-4147 — Design Guidelines for RCD Snubber of Flyback 1. 2. 3. The junction temperature can limit the maximum output power. 230VAC or 100/115VAC with doubler. Typical continuous power in a non-ventilated enclosed adapter measured at 50°C ambient. Ordering Information Part Number Operating Temperature Range Top Mark FSL136MR -40 to +105°C FSL136MR © 2009 Fairchild Semiconductor Corporation FSL136MR • Rev. 1.0.7 Package 8-Lead, Dual Inline Package (DIP) Packing Method Rail www.fairchildsemi.com FSL136MR — Green Mode Fairchild Power Switch (FPS™) June 2010 FSL136MR — Green Mode Fairchild Power Switch (FPS™) Typical Application Diagram Figure 1. Typical Application Internal Block Diagram V ST R 5 VCC 2 D ra in 6 ,7 ,8 IC H V B U R L/V B U R H V CC 8 V /1 2V V CC Good Inte rna l B ia s V R EF V CC I D EL A Y R a ndom Fre que nc y G e ne ra tor IF B V FB 3 OSC PWM 2 .5 R S Q R Q G a te Driv e r R IPK 4 O n -Tim e D e te c tor LE B S oft S ta rt OSP V SD V CC Good VCC V O VP S Q R Q 1 GN D A OC P V AO C P TS D Figure 2. Internal Block Diagram © 2009 Fairchild Semiconductor Corporation FSL136MR • Rev. 1.0.7 www.fairchildsemi.com 2 Figure 3. Pin Configuration Pin Definitions Pin # Name 1 GND Ground. SenseFET source terminal on the primary side and internal control ground. 2 VCC Positive Supply Voltage Input. Although connected to an auxiliary transformer winding, current is supplied from pin 5 (VSTR) via an internal switch during startup (see Figure 2). Once VCC reaches the UVLO upper threshold (12V), the internal startup switch opens and device power is supplied via the auxiliary transformer winding. 3 VFB Feedback Voltage. The non-inverting input to the PWM comparator, it has a 0.4mA current source connected internally, while a capacitor and opto-coupler are typically connected externally. There is a delay while charging external capacitor CFB from 2.4V to 6V using an internal 5µA current source. This delay prevents false triggering under transient conditions, but still allows the protection mechanism to operate under true overload conditions. 4 IPK Peak Current Limit. Adjusts the peak current limit of the SenseFET. The feedback 0.4mA current source is diverted to the parallel combination of an internal 6kΩ resistor and any external resistor to GND on this pin to determine the peak current limit. 5 VSTR Startup. Connected to the rectified AC line voltage source. At startup, the internal switch supplies internal bias and charges an external storage capacitor placed between the VCC pin and ground. Once VCC reaches 12V, the internal switch is opened. 6, 7, 8 Drain Drain. Designed to connect directly to the primary lead of the transformer and capable of switching a maximum of 650V. Minimizing the length of the trace connecting these pins to the transformer decreases leakage inductance. Description © 2009 Fairchild Semiconductor Corporation FSL136MR • Rev. 1.0.7 FSL136MR — 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. TJ = 25°C, unless otherwise specified. Symbol Parameter Min. Max. Unit VSTR VSTR Pin Voltage -0.3 650.0 V VDS Drain Pin Voltage -0.3 650.0 V VCC Supply Voltage 26 V VFB Feedback Voltage Range -0.3 12.0 V ID Continuous Drain Current 3 A 12 A IDM Drain Current Pulsed (4) (5) EAS Single Pulsed Avalanche Energy 230 mJ PD Total Power Dissipation 1.5 W TJ Operating Junction Temperature TA Operating Ambient Temperature TSTG ESD Internally Limited Storage Temperature Human Body Model, JESD22-A114 (6) Charged Device Model, JESD22-C101 ΘJA Junction-to-Ambient Thermal Resistance ΘJC Junction-to-Case Thermal Resistance ΘJT Junction-to-Top Thermal Resistance +105 °C -55 +150 °C 5.0 (6) KV 1.5 (7,8) (7,9) (7,10) °C -40 80 °C/W 19 °C/W 33.7 °C/W FSL136MR — Green Mode Fairchild Power Switch (FPS™) Absolute Maximum Ratings Notes: 4. Repetitive rating: pulse width limited by maximum junction temperature. 5. L=51mH, starting TJ=25°C. 6. Meets JEDEC standards JESD 22-A114 and JESD 22-C101. 7. All items are tested with the standards JESD 51-2 and JESD 51-10. 8. ΘJA free-standing, with no heat-sink, under natural convection. 9. ΘJC junction-to-lead thermal characteristics under ΘJA test condition. TC is measured on the source #7 pin closed to plastic interface for ΘJA thermo-couple mounted on soldering. 10. ΘJT junction-to-top of thermal characteristic under ΘJA test condition. Tt is measured on top of package. Thermocouple is mounted in epoxy glue. © 2009 Fairchild Semiconductor Corporation FSL136MR • Rev. 1.0.7 www.fairchildsemi.com 4 TA = 25°C unless otherwise specified. Symbol Parameter Conditions Min. Typ. Max. Units SenseFET Section BVDSS Drain-Source Breakdown Voltage IDSS Zero Gate Voltage Drain Current VDS = 650V, VGS = 0V Drain-Source On-State Resistance VGS = 10V, VGS = 0V, TC = 25°C 3.5 RDS(ON) VCC = 0V, ID = 250µA 650 V 250 µA 4.0 Ω CISS Input Capacitance VGS = 0V, VDS = 25V, f = 1MHz 290 pF COSS Output Capacitance VGS = 0V, VDS = 25V, f = 1MHz 45 pF CRSS Reverse Transfer Capacitance VGS = 0V, VDS = 25V, f = 1MHz 5.5 pF td(ON) Turn-On Delay VDD = 350V, ID = 3.5A 12 ns Rise Time VDD = 350V, ID = 3.5A 22 ns Turn-Off Delay VDD = 350V, ID = 3.5A 20 ns Fall Time VDD = 350V, ID = 3.5A 19 ns tr td(OFF) tf Control Section fOSC ∆fOSC Switching Frequency VDS = 650V, VGS = 0V Switching Frequency Variation VGS = 10V, VGS = 0V, TC = 125°C fFM Frequency Modulation DMAX Maximum Duty Cycle VFB = 4V DMIN Minimum Duty Cycle VFB = 0V VSTART VSTOP 61 67 73 KHz ±5 ±10 % ±3 UVLO Threshold Voltage After Turn-On 71 77 KHz 83 % 0 0 0 % 11 12 13 V 7 8 9 V IFB Feedback Source Current VFB = 0V 320 400 480 µA tS/S Internal Soft-Start Time VFB = 4V 10 15 20 ms 0.4 0.5 0.6 V 0.25 0.35 0.45 V FSL136MR — Green Mode Fairchild Power Switch (FPS™) Electrical Characteristics Burst Mode Section VBURH VBURL TJ = 25°C Burst Mode Voltage VBUR(HYS) 150 mV Protection Section ILIM Peak Current Limit tCLD Current Limit Delay Time VSD Shutdown Feedback Voltage VCC = 15V IDELAY Shutdown Delay Current VFB = 5V 3.5 VOVP Over-Voltage Protection Threshold VFB = 2V 22.5 1.00 Output-Short (11) Protection VAOCP AOCP Voltage TSD Thermal (11) Shutdown tLEB (11) TJ = 25°C Shutdown Temperature 5.5 2.41 6.0 6.5 V 5.0 6.5 µA 24.0 25.5 V 1.35 µs 1.60 V 2.0 2.5 µs 0.85 1.00 1.15 V 125 137 150 °C 60 (11) A ns 1.44 Hysteresis Leading-Edge Blanking Time 2.15 200 TJ = 25°C Threshold Feedback OSP Triggered When tONVOSP and Lasts Longer than tOSP_FB Feedback Blanking Time tOSP_FB HYSTSD 1.89 Threshold Time tOSP VOSP TJ = 25°C, di/dt = 300mA/µs (11) 300 °C ns Continued on the following page… © 2009 Fairchild Semiconductor Corporation FSL136MR • Rev. 1.0.7 www.fairchildsemi.com 5 TA = 25°C unless otherwise specified. Symbol Parameter Conditions Min. Typ. Max. Units Total Device Section IOP1 Operating Supply Current (While Switching) IOP2 ICH VSTR (11) VCC = 14V, VFB > VBURH 2.5 3.5 mA Operating Supply Current (Control Part Only) VCC = 14V, VFB < VBURL 1.8 2.5 mA Startup Charging Current VCC = 0V 1.10 1.30 mA Minimum VSTR Supply Voltage VCC = VFB = 0V, VSTR Increase Note: 11. Though guaranteed by design, it is not 100% tested in production. © 2009 Fairchild Semiconductor Corporation FSL136MR • Rev. 1.0.7 0.90 35 V FSL136MR — Green Mode Fairchild Power Switch (FPS™) Electrical Characteristics (Continued) www.fairchildsemi.com 6 These characteristic graphs are normalized at TA=25. Operating Frequency (fOSC) Maximum Duty Cycle (DMAX) 1.4 1.4 1.3 1.3 1.2 1.2 1.1 1.1 1 1 0.9 0.9 0.8 0.8 0.7 0.7 0.6 0.6 ‐40Ԩ ‐25Ԩ 0Ԩ 25Ԩ 50Ԩ 75Ԩ 100Ԩ 120Ԩ 140Ԩ ‐40Ԩ ‐25Ԩ Figure 4. Operating Frequency vs. Temperature 0Ԩ 25Ԩ 50Ԩ 75Ԩ 100Ԩ 120Ԩ 140Ԩ Figure 5. Maximum Duty Cycle vs. Temperature Start Threshold Voltage (V START) Operating Supply Current (Iop2) 1.4 1.4 1.3 1.3 1.2 1.2 1.1 1.1 1.0 1.0 0.9 0.9 0.8 0.8 0.7 0.7 0.6 FSL136MR — Green Mode Fairchild Power Switch (FPS™) Typical Performance Characteristics 0.6 ‐40 ‐25 0 25 50 75 100 120 140 ‐40 Figure 6. Operating Supply Current vs. Temperature ‐25 0 25 50 75 100 120 140 Figure 7. Start Threshold Voltage vs. Temperature Stop Threshold Voltage (V STOP) Feedback Source Current (IFB) 1.4 1.4 1.3 1.3 1.2 1.2 1.1 1.1 1.0 1 0.9 0.9 0.8 0.8 0.7 0.7 0.6 0.6 ‐40 ‐25 0 25 50 75 100 120 ‐40 Ԩ ‐25 Ԩ 140 Figure 8. Stop Threshold Voltage vs. Temperature © 2009 Fairchild Semiconductor Corporation FSL136MR • Rev. 1.0.7 0Ԩ 25Ԩ 50 Ԩ 75 Ԩ 100 Ԩ 120 Ԩ 140 Ԩ Figure 9. Feedback Source Current vs. Temperature www.fairchildsemi.com 7 These characteristic graphs are normalized at TA=25. Peak Current Limit (ILIM) Startup Charging Current (ICH) 1.4 1.4 1.3 1.3 1.2 1.2 1.1 1.1 1 1 0.9 0.9 0.8 0.8 0.7 0.7 0.6 0.6 ‐40Ԩ ‐25Ԩ 0Ԩ 25Ԩ 50Ԩ 75Ԩ 100Ԩ 120Ԩ 140Ԩ ‐40Ԩ ‐25Ԩ 0Ԩ 25Ԩ 50Ԩ 75Ԩ 100Ԩ 120Ԩ 140Ԩ Figure 10. Startup Charging Current vs. Temperature Figure 11. Peak Current Limit vs. Temperature Burst Operating Supply Current (Iop1 )  Over‐Voltage Protection (V OVP) 1.4 1.4 1.3 1.3 1.2 1.2 1.1 1.1 1.0 1 0.9 0.9 0.8 0.8 0.7 0.7 FSL136MR — Green Mode Fairchild Power Switch (FPS™) Typical Performance Characteristics (Continued) 0.6 0.6 ‐40 ‐25 0 25 50 75 100 120 ‐40Ԩ ‐25Ԩ 140 Figure 12. Burst Operating Supply Current vs. Temperature © 2009 Fairchild Semiconductor Corporation FSL136MR • Rev. 1.0.7 0Ԩ 25Ԩ 50Ԩ 75Ԩ 100Ԩ 120Ԩ 140Ԩ Figure 13. Over-Voltage Protection vs. Temperature www.fairchildsemi.com 8 Startup Feedback Control At startup, an internal high-voltage current source supplies the internal bias and charges the external capacitor (CA) connected with the VCC pin, as illustrated in Figure 14. When VCC reaches the start voltage of 12V, the FPS™ begins switching and the internal highvoltage current source is disabled. The FPS continues normal switching operation and the power is provided from the auxiliary transformer winding unless VCC goes below the stop voltage of 8V. FSL136MR employs current-mode control, as shown in Figure 16. An opto-coupler (such as the FOD817A) and shunt regulator (such as the KA431) are typically used to implement the feedback network. Comparing the feedback voltage with the voltage across the RSENSE resistor makes it possible to control the switching duty cycle. When the shunt regulator reference pin voltage exceeds the internal reference voltage of 2.5V, the opto-coupler LED current increases, the feedback voltage VFB is pulled down, and the duty cycle is reduced. This typically occurs when the input voltage is increased or the output load is decreased. Figure 14. Startup Circuit Figure 16. Pulse-Width-Modulation Circuit Oscillator Block The oscillator frequency is set internally and the FPS has a random frequency fluctuation function. Fluctuation of the switching frequency of a switched power supply 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 range of the frequency variation. The range of frequency variation is fixed internally; however, its selection is randomly chosen by the combination of external feedback voltage and internal free-running oscillator. This randomly chosen switching frequency effectively spreads the EMI noise nearby switching frequency and allows the use of a cost-effective inductor instead of an AC input line filter to satisfy the world-wide EMI requirements. Leading-Edge Blanking (LEB) FSL136MR — Green Mode Fairchild Power Switch (FPS™) Functional Description At the instant the internal SenseFET is turned on, the primary-side capacitance and secondary-side rectifier diode reverse recovery typically cause a high-current spike through the SenseFET. Excessive voltage across the RSENSE resistor leads to incorrect feedback operation in the current-mode PWM control. To counter this effect, the FPS employs a leading-edge blanking (LEB) circuit (see the Figure 16). This circuit inhibits the PWM comparator for a short time (tLEB) after the SenseFET is turned on. Protection Circuits The FPS has several protective functions, such as overload protection (OLP), over-voltage protection (OVP), output-short protection (OSP), under-voltage lockout (UVLO), abnormal over-current protection (AOCP), and thermal shutdown (TSD). Because these various protection circuits are fully integrated in the IC without external components, the reliability is improved without increasing cost. Once a fault condition occurs, switching is terminated and the SenseFET remains off. This causes VCC to fall. When VCC reaches the UVLO stop voltage, VSTOP (8V), the protection is reset and the internal high-voltage current source charges the VCC capacitor via the VSTR pin. When VCC reaches the UVLO start voltage, VSTART (12V), the FPS 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. Figure 15. Frequency Fluctuation Waveform © 2009 Fairchild Semiconductor Corporation FSL136MR • Rev. 1.0.7 www.fairchildsemi.com 9 Figure 17. Auto-Restart Protection Waveforms Overload Protection (OLP) Overload is defined as the load current exceeding a pre-set 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 operating normally, the overload protection (OLP) circuit can be activated during the load transition or startup. To avoid this undesired operation, the OLP circuit is designed to be activated after a specified time to determine whether it is a transient situation or a true overload situation. Figure 19. Abnormal Over-Current Protection Thermal Shutdown (TSD) The SenseFET and the control IC are integrated, making it easier to detect the temperature of the SenseFET. When the temperature exceeds approximately 137°C, thermal shutdown is activated. In conjunction with the IPK current limit pin (if used), the current-mode feedback path limits the current in the SenseFET when the maximum PWM duty cycle is attained. If the output consumes more than this maximum power, the output voltage (VO) decreases below its rating voltage. This reduces the current through the opto-coupler LED, which also reduces the opto-coupler transistor current, thus increasing the feedback voltage (VFB). If VFB exceeds 2.4V, the feedback input diode is blocked and the 5µA current source (IDELAY) slowly starts to charge CFB. In this condition, VFB increases until it reaches 6V, when the switching operation is terminated, as shown in Figure 18. The shutdown delay is the time required to charge CFB from 2.4V to 6V with 5µA current source. Figure 18. Over-Voltage Protection (OVP) In the event of a malfunction in the secondary-side feedback circuit or an open feedback loop caused by a soldering defect, 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 activated. Because excess energy 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 FPS uses VCC instead of directly monitoring the output voltage. If VCC exceeds 24V, OVP circuit is activated, resulting in termination of the switching operation. To avoid undesired activation of OVP during normal operation, VCC should be designed to be below 24V. Output-Short Protection (OSP) If the output is shorted, the steep current with extremely high di/dt can flow through the SenseFET during the LEB time. Such a steep current brings high-voltage stress on the drain of SenseFET when turned off. To protect the device from such an abnormal condition, OSP detects VFB and SenseFET turn-on time. When the VFB is higher than 1.6V and the SenseFET turn-on time Overload Protection (OLP) © 2009 Fairchild Semiconductor Corporation FSL136MR • Rev. 1.0.7 FSL136MR — Green Mode Fairchild Power Switch (FPS™) Abnormal Over-Current Protection (AOCP) When the secondary rectifier diodes or the transformer pin are shorted, a steep current with extremely high di/dt can flow through the SenseFET during the LEB time. Even though the FPS has OLP (Overload Protection), it is not enough to protect the FPS in that abnormal case, since severe current stress is imposed on the SenseFET until OLP triggers. The FPS includes the internal AOCP (Abnormal Over-Current Protection) circuit shown in Figure 19. When the gate turn-on signal is applied to the power SenseFET, the AOCP block is enabled and monitors the current through the sensing resistor. The voltage across the resistor is compared with a preset AOCP level. If the sensing resistor voltage is greater than the AOCP level, the set signal is applied to the latch, resulting in the shutdown of the SMPS. www.fairchildsemi.com 10 Figure 20. Output Short Waveforms (OSP) Soft-Start The FPS has an internal soft-start circuit that slowly increases the feedback voltage, together with the SenseFET current, after it starts. The typical soft-start time is 15ms, as shown in Figure 21, where progressive increments of the SenseFET current are allowed during the startup phase. The pulse width to the power switching device is progressively increased to establish the correct working conditions for transformers, inductors, and capacitors. The voltage on the output capacitors is progressively increased with the intention of smoothly establishing the required output voltage. Soft-start helps prevent transformer saturation and reduce the stress on the secondary diode. Figure 22. Burst-Mode Operation Adjusting Peak Current Limit As shown in Figure 23, a combined 6kΩ internal resistance is connected to the non-inverting lead on the PWM comparator. An external resistance of Rx on the current limit pin forms a parallel resistance with the 6kΩ when the internal diodes are biased by the main current source of 400µA. For example, FSL136MR has a typical SenseFET peak current limit (ILIM) of 2.15A. ILIM can be adjusted to 1.5A by inserting Rx between the IPK pin and the ground. The value of the Rx can be estimated by the following equations: 2.15A: 1.5A = 6kΩ : XkΩ (1) X = Rx || 6kΩ (2) FSL136MR — Green Mode Fairchild Power Switch (FPS™) is lower than 1.0µs, the FPS recognizes this condition as an abnormal error and shuts down PWM switching until VCC reaches VSTART again. An abnormal condition output is shown in Figure 20. where X is the resistance of the parallel network. Figure 21. Internal Soft-Start Burst Operation To minimize power dissipation in standby mode, the FPS enters burst mode. As the load decreases, the feedback voltage decreases. As shown in Figure 22, the device automatically enters burst mode when the feedback voltage drops below VBURH. Switching continues until the feedback voltage drops below VBURL. At this point, switching stops and the output voltages drop at a rate dependent on standby current load. This causes the feedback voltage to rise. Once it passes VBURH, switching resumes. The feedback voltage then falls and the process repeats. Burst mode alternately enables and disables switching of the SenseFET and reduces switching loss in standby mode. © 2009 Fairchild Semiconductor Corporation FSL136MR • Rev. 1.0.7 Figure 23. Peak Current Limit Adjustment www.fairchildsemi.com 11 9.83 9.00 8 5 6.670 6.096 1 4 8.255 7.610 TOP VIEW 1.65 1.27 (0.56) 7.62 3.683 3.200 5.08 MAX 3.60 3.00 0.33 MIN 0.560 0.355 2.54 0.356 0.200 7.62 9.957 7.870 FRONT VIEW SIDE VIEW NOTES: A. CONFORMS TO JEDEC MS-001, VARIATION BA 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-2009 E. DRAWING FILENAME: MKT-N08Frev3 15° 0° 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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