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Document overview
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Technical content
Features
Advanced Soft Burst-Mode Operation for Low Standby Power and Low Audible Noise Random Frequency Fluctuation (RFF) 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, Output-Short Protection (OSP), and Under-Voltage Lockout (UVLO) with Hysteresis Low Operating Current (0.4mA) in Burst Mode Internal Startup Circuit Internal High-Voltage SenseFET: 650V Built-in Soft-Start: 15ms Auto-Restart Mode
Applications
Power Supply for LCD Monitor, STB, and DVD Combination
Description
The FSL146MRBN is an integrated Pulse Width Modulation (PWM) controller and SenseFET 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), Leading-Edge 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 FSL146MRBN 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.
Ordering Information
RDS(ON) (Max.) Output Power Table(2) Replaces Device 230VAC ± 15%(3) 85-265VAC Adapter (4) Open Frame(5) Adapter (4) Open Frame(5) FSL146MRBN 8-DIP -40°C ~ +125°C 1.50A 2.6 23W 35W 17W 26W FSFM260 N Notes: 1. Lead-free package per JEDEC J-STD-020B. 2. The junction temperature can limit the maximum output power. 3. 230V AC or 100/115VAC with voltage doubler. 4. Typical continuous power in a non-v entilated enclosed adapter measured at 50C ambient temperature. 5. Maximum practical continuous power in an open-frame design at 50 C ambient temperature.
Figure 3. Pin Configuration (Top View) 1 GND Ground. This pin is the control ground and the SenseFET source. current for both startup and steady-state operation. Feedback. This pin is internally connected to the inverting input of the PWM comparator. overload protection triggers, which shuts down the FPS™. 5, 6, 7, 8 Drain SenseFET Drain. High-voltage power SenseFET drain connection.
operable above the recommended operating conditions and stressi ng 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.
- Repetitive peak switching current when the i nductive load is assumed: Limited by maximum duty (DMAX=0.73)
and junction temperature (see Figure 4).
- L=45mH, starting T J=25C.
- Infinite cooling condition (refer to the SEMI G30-88).
- Although this parameter guarantees IC operation, it does not guarantee all electrical characteristics.
Figure 4. Repetitive Peak Switching Current TA=25°C unless otherwise specified.
- JEDEC recommended environment, JESD51-2 and test board, JESD51-10 with minimum land pattern.
- Measured on the SOURCE pin #7, close to the plastic interface.
© 2012 Fairchild Semiconductor Corporation www.fairchildsemi.com FSL146MRBN • Rev. 1.0.0 5 FSL146MRBN — Green-Mode Fairchild Power Switch (FPS™)
Electrical Characteristics
TJ = 25C unless otherwise specified. Symbol Parameter Conditions Min. Typ. Max. Unit SenseFET Section BVDSS Drain-Source Breakdown Voltage V CC = 0V, ID = 250µA 650 V IDSS Zero-Gate-Voltage Drain Current VDS = 650V, TA = 25C 250 µA RDS(ON) Drain-Source On-State Resistance V GS=10V, ID =1A 2.1 2.6 Ω CISS Input Capacitance (12) V DS = 25V, VGS = 0V, f=1MHz 436 pF COSS Output Capacitance (12) V DS = 25V, VGS = 0V, f=1MHz 65 pF tr Rise Time V DS = 325V, ID = 4A, RG=25Ω 24 ns tf Fall Time V DS = 325V, ID = 4A, RG=25Ω 24 ns td(on) Turn-On Delay V DS = 325V, ID = 4A, RG=25Ω 13 ns td(off) Turn-Off Delay V DS = 325V, ID= 4A, RG=25Ω 30 ns Control Section fS Switching Frequency(12) V CC = 14V, VFB = 4V 61 67 73 kHz fS Switching Frequency Variation(12) -25C < TJ < 125C ±5 ±10 % DMAX Maximum Duty Ratio V CC = 14V, VFB = 4V 61 67 73 % DMIN Minimum Duty Ratio V CC = 14V, VFB = 0V 0 % IFB Feedback Source Current V FB = 0 65 90 115 µA VSTART UVLO Threshold Voltage VFB = 0V, VCC Sweep 11 12 13 V VSTOP After Turn-On, VFB = 0V 7.0 7.5 8.0 V tS/S Internal Soft-Start Time V STR = 40V, VCC Sweep 15 ms VRECOMM Recommended V CC Range 13 23 V Burst-Mode Section VBURH Burst-Mode Voltage V CC = 14V, VFB Sweep 0.45 0.50 0.55 V VBURL 0.30 0.35 0.40 V VHYS 150 mV Protection Section ILIM Peak Drain Current Limit di/dt = 300mA/µs 1.35 1.50 1.65 A VSD Shutdown Feedback Voltage V CC = 14V, VFB Sweep 6.45 7.00 7.55 V IDELAY Shutdown Delay Current V CC = 14V, VFB = 4V 1.2 2.0 2.8 µA tLEB Leading-Edge Blanking Time(12,14) 300 ns VOVP Over-Voltage Protection V CC Sweep 23.0 24.5 26.0 V tOSP Output-Short Protection(12) Threshold Time OSP Triggered when tON<tOSP & VFB>VOSP (Lasts Longer than tOSP_FB) 0.7 1.0 1.3 µs VOSP Threshold V FB 1.8 2.0 2.2 V tOSP_FB V FB Blanking Time 2.0 2.5 3.0 µs TSD Thermal Shutdown Temperature(12) Shutdown Temperature 125 135 145 C THYS Hysteresis 60 C Continued on the following page…
© 2012 Fairchild Semiconductor Corporation www.fairchildsemi.com FSL146MRBN • Rev. 1.0.0 6 FSL146MRBN — Green-Mode Fairchild Power Switch (FPS™) Electrical Characteristics (Continued) TJ = 25C unless otherwise specified. Symbol Parameter Conditions Min. Typ. Max. Unit Total Device Section IOP Operating Supply Current, (Control Part in Burst Mode) VCC = 14V, VFB = 0V 0.3 0.4 0.5 mA IOPS Operating Switching Current, (Control Part and SenseFET Part) VCC = 14V, VFB = 2V 1.1 1.5 1.9 mA ISTART Start Current VCC=11V (Before VCC Reaches VSTART) 85 120 155 µA ICH Startup Charging Current VCC = VFB = 0V, VSTR = 40V 0.7 1.0 1.3 mA VSTR Minimum VSTR Supply Voltage VCC = VFB = 0V, VSTR Sweep 26 V Notes: 12. Although these parameters are guaranteed, they are not 100% tested in production. 13. Average value. 14. t LEB includes gate turn-on time. Comparison of FSFM260N and FSL146MRBN Function FSFM260N FSL146MRBN Advantages of FSL146MRBN Operating Current 1.5mA 0.4mA Very low standby power Power Balance Long t CLD Very Short t CLD The difference of input power between the low and high input voltage is quite small.
- Startup: At startup, an internal high-voltage current
VCC goes below the stop voltage of 7.5V. Figure 17. Startup Block
- Soft-Start : The internal soft-start circuit increases
secondary diode during startup.
- Feedback Control : This device employs Current-
input voltage is increased or the output load is decreased.
3.1 Pulse-by-Pulse Current Limit : Because Current-
PWM comparator (V FB*), as shown in Figure 18. the current through the SenseFET is limited.
3.2 Leading-Edge Blanking (LEB) : At the instant the
Figure 18. Pulse Width Modulation Circuit
- Protection Circuits : The self-protective functions
switching is terminated and the SenseFET remains off. reliability is improved without increasing cost. Figure 19. Auto-Restart Protection Waveforms
4.1 Overload Protection (OLP) : Overload is defined
protection circuit should trigger to protect the SMPS.
- The delay for shutdown is the time required to
protection is implemented in Auto-Restart Mode. Figure 20. Overload Protection
4.2 Abnormal Over-Curre nt Protection (AOCP) :
Figure 21. Abnormal Over-Current Protection
stress on the drain of the SenseFET when turned off. OSP protects the device from this abnormal condition. Figure 22. Output-Short Protection
4.4 Over-Voltage Protection (OVP): If the
be designed to be below 24.5V.
4.5 Thermal Shutdown (TSD) : The SenseFET and
thermal shutdown is tr iggered and stops operation. when normal operation resumes.
- Soft Burst-Mode Operation : To minimize power
drop at a rate dependent on the standby current load. feedback voltage then falls and the process repeats. Figure 23. Burst Mode Operation
- Random Frequency Fluctuation (RFF) : Fluctuating
switching frequency variation, which is limited internally. filter used to meet EMI requirements (e.g. EN55022). Figure 24. Random Frequency Fluctuation
- The delay for overload protection is designed to be abo ut 30ms with C105 (8.2nF). OLP time between 39ms
(12nF) and 46ms (15nF) is recommended.
- The SMD-type capacitor (C106) must be placed as close as possible to the V CC pin to avoid malfunction by
Figure 25. Schematic
© 2012 Fairchild Semiconductor Corporation www.fairchildsemi.com FSL146MRBN • Rev. 1.0.0 13 FSL146MRBN — Green-Mode Fairchild Power Switch (FPS™) Transformer Np/2 N14V N5V Np/2 1 Na 45 8N5V 6 BOT TOP Barrier tape Figure 26. Schematic of Transformer Inductance 1 －3 826H ±6% 67kHz, 1V Leakage 1 －3 15H Maximum Short all other pins Core & Bobbin Core: EER3016 (Ae=109.7mm2) Bobbin: EER3016
© 2012 Fairchild Semiconductor Corporation www.fairchildsemi.com FSL146MRBN • Rev. 1.0.0 14 FSL146MRBN — Green-Mode Fairchild Power Switch (FPS™) Bill of Materials Part # Value Note Part # Value Note Fuse Capacitor F101 250V 2A C101 220nF / 275V Box (Pilkor) NTC C102 150nF/275V Box (Pilkor) NTC101 5D-9 DSC C103 100µF / 400V Electrolytic (SamYoung) Resistor C104 3.3nF/630V Film (Sehwa) R101 1.5M Ω, J 1W C105 15nF / 100V Film (Sehwa) R103 43k Ω, J 1W C106 100nF SMD (2012) R201 1.5k Ω, F 1/4W, 1% C107 47µF / 50V Electrolytic (SamYoung) R202 1.0k Ω, F 1/4W, 1% C201 820µF / 25V Electrolytic (SamYoung) R203 18k Ω, F 1/4W, 1% C202 820µF / 25V Electrolytic (SamYoung) R204 8k Ω, F 1/4W, 1% C203 2200µF / 10V Electrolytic (SamYoung) R205 8k Ω, F 1/4W, 1% C204 1000µF / 16V Electrolytic (SamYoung) C205 47nF / 100V Film (Sehwa) C301 2.2nF / Y2 Y-cap (Samhwa) IC Inductor FPS FSL146MRBN Fairchild LF101 20mH Line filter 0.5Ø IC201 KA431LZ Fairchild L201 5µH 5A Rating IC301 FOD817B Fairchild L202 5µH 5A Rating Diode Transformer D101 1N4007 Vishay T101 826µH D102 UF4007 Vishay ZD101 1N4750 Vishay D201 MBRF10H100 Fairchild D202 MBRF1060 Fairchild BD101 G2SBA60 Vishay
Figure 27. 8-Lead, MDIP, JEDEC MS-001, .300" Wide specifically the warranty therein, which covers Fairchild products. http://www.fairchildsemi.com/packaging/.
5.08 MAX
0.33 MIN
B) ALL DIMENSIONS ARE IN MILLIMETERS. MOLD FLASH, AND TIE BAR EXTRUSIONS. E) DRAWING FILENAME AND REVSION: MKT-N08FREV2.
© 2012 Fairchild Semiconductor Corporation www.fairchildsemi.com FSL146MRBN • Rev. 1.0.0 16 FSL146MRBN — Green-Mode Fairchild Power Switch (FPS™)