FSQ110

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It is specifically designed for highperformance off-line Switch-Mode Power Supplies (SMPS) with minimal external components. „ Consumes only 0.65W at 230 VAC & 0.3W Load with Burst-Mode Operation „ Precision Fixed Operating Frequency: 100kHz „ Internal Start-up Circuit and Built-in Soft-Start „ Pulse-by-Pulse Current Limiting and Auto-Restart „ „ „ „ Mode Over-Voltage Protection (OVP), Overload Protection (OLP), Internal Thermal Shutdown Function (TSD) Under-Voltage Lockout (UVLO) Low Operating Current: 3mA Adjustable Peak Current Limit The integrated PWM controller features include: a fixedfrequency generating oscillator, Under-Voltage Lockout (UVLO) protection, Leading-Edge Blanking (LEB), an optimized gate turn-on/ turn-off driver, Thermal Shutdown (TSD) protection, and temperaturecompensated precision current sources for loop compensation and fault protection circuitry. Compared to a discrete MOSFET and controller or RCC switching converter solution, the FSQ110 reduces total component count, design size, and weight while increasing efficiency, productivity, and system reliability. These devices provide a basic platform that is well suited for the design of cost-effective flyback converters. Applications „ SMPS for STB, Low-cost DVD Related Application Notes „ AN-4134: Design Guidelines for Off-line Forward Converters Using Fairchild Power Switch (FPS™) „ AN-4137: Design Guidelines for Off-line Flyback 8-DIP Converters Using Fairchild Power Switch (FPS™) „ AN-4141: Troubleshooting and Design Tips for Fairchild Power Switch (FPS™) Flyback Applications „ AN-4147: Design Guidelines for RCD Snubber of Flyback Ordering Information Product Number Package Marking Code BVDSS fOSC RDS(ON) (MAX.) FSQ110 8DIP Q110 650V 100kHz 19Ω All package are lead free per JEDEC: J-STD-020B standard. FPSTM is a trademark of Fairchild Semiconductor Corporation. © 2007 Fairchild Semiconductor Corporation FSQ110 Rev. 1.0.0 www.fairchildsemi.com FSQ110 — Green Mode Fairchild Power Switch (FPS™) November 2007 AC IN DC OUT Vstr IPK Drain PWM VCC FB GND FSQ0x70RNA Rev. 1.01 Figure 1. Typical Flyback Application Output Power Table(1) 230VAC ±15%(2) Product Adapter FSQ110 (3) 85–265VAC (4) (3) Open Frame 11W Open Frame(4) Adapter 17W 8W 12W Notes: 1. The maximum output power can be limited by junction temperature. 2. 230 VAC or 100/115 VAC with doubler. 3. Typical continuous power in a non-ventilated enclosed adapter with sufficient drain pattern as a heat sink, at 50°C ambient. 4. Maximum practical continuous power in an open-frame design with sufficient drain pattern as a heat sink, at 50°C ambient. Internal Block Diagram VCC Vstr 2 5 Drain 6,7,8 ICH 8V/12V VCC good VCC Internal Bias Vref VBURL/VBURH VCC OSC IDELAY IFB Normal FB 3 2.5R PWM R IPK 4 S Q R Q Gate Driver Burst LEB VSD VCC 1 S Q R Q GND Vovp VCC good TSD Soft-Start FSQ110 Rev. 1.00 Figure 2. Internal Block Diagram © 2007 Fairchild Semiconductor Corporation FSQ110 Rev. 1.0.0 www.fairchildsemi.com 2 FSQ110 — Green Mode Fairchild Power Switch (FPS™) Application Diagram D GND VCC D 8-DIP FB D IPK Vstr FSQ110 Figure 3. Pin Configuration (Top View) Pin Definitions Pin # Name 1 GND Ground. SenseFET source terminal on primary side and internal control ground. VCC Power Supply. Positive supply voltage input. Although connected to an auxiliary transformer winding, current is supplied from pin 5 (Vstr) via an internal switch during start-up (see Figure 2). It is not until VCC reaches the UVLO upper threshold (12V) that the internal start-up switch opens and device power is supplied via the auxiliary transformer winding. FB Feedback. The feedback voltage pin is the non-inverting input to the PWM comparator. It has a 0.9mA current source connected internally, while a capacitor and opto-coupler are typically connected externally. A feedback voltage of 6V triggers overload protection (OLP). A time delay while charging external capacitor CFB from 3V to 6V using an internal 5µA current source delay prevents false triggering under transient conditions, but still allows the protection mechanism to operate under true overload conditions. 4 IPK Peak Current Limit. This pin adjusts the peak current limit of the SenseFET. The 0.9mA feedback current source is diverted to the parallel combination of an internal 2.8kΩ resistor and any external resistor to GND on this pin. This determines the peak current limit. If this pin is tied to VCC or left floating, the typical peak current limit is 0.7A. 5 Vstr Start-up. This pin connects to the rectified AC line voltage source. At start-up, the internal switch supplies internal bias and charges an external storage capacitor placed between the VCC pin and ground. Once the VCC reaches 12V, the internal switch is opened. 6 D SenseFET Drain. High-voltage power SenseFET drain connection. 7 D SenseFET Drain. High-voltage power SenseFET drain connection. 8 D SenseFET Drain. High-voltage power SenseFET drain connection. 2 3 Description © 2007 Fairchild Semiconductor Corporation FSQ110 Rev. 1.0.0 www.fairchildsemi.com 3 FSQ110 — Green Mode Fairchild Power Switch (FPS™) Pin Configuration 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. TA = 25°C, unless otherwise specified. Symbol VDRAIN VSTR IDM Value Unit Drain Pin Voltage Characteristic 650 V Vstr Pin Voltage 650 V 1.5 A Drain Current Pulsed(5) EAS Single Pulsed Avalanche VCC Supply Voltage VFB Feedback Voltage Range PD Total Power Dissipation TJ TA TSTG Energy(6) 10 mJ 20 V -0.3 to VCC V 1.40 W Operating Junction Temperature Internally limited °C Operating Ambient Temperature -25 to +85 °C Storage Temperature -55 to +150 °C Notes: 5. Repetitive rating: Pulse width is limited by maximum junction temperature. 6. L = 24mH, starting TJ = 25°C. Thermal Impedance TA = 25°C, unless otherwise specified. All items are tested with the standards JESD 51-2 and 51-10 (DIP). Symbol θJA θJC Parameter Junction-to-Ambient Thermal Junction-to-Case Thermal Resistance(7) Resistance(8) Value Unit 88.84 °C/W 13.94 °C/W Notes: 7. Free standing with no heatsink; without copper clad. (Measurement Condition - Just before junction temperature TJ enters into OTP.) 8. Measured on the DRAIN pin close to plastic interface. © 2007 Fairchild Semiconductor Corporation FSQ110 Rev. 1.0.0 www.fairchildsemi.com 4 FSQ110 — Green Mode Fairchild Power Switch (FPS™) Absolute Maximum Ratings TA = 25°C unless otherwise specified. Symbol SenseFET IDSS RDS(ON) Parameter Condition Min. Typ. Zero-Gate-Voltage Drain Current Drain-Source On-State Resistance(11) VDS = Max. Rating VGS = 0V 25 VDS = 0.8 Max. Rating VGS = 0V, TC = 125°C 200 VGS = 10V, ID = 0.5A 14 Input Capacitance COSS Output Capacitance CRSS Reverse Transfer Capacitance 3.8 td(on) Turn-On Delay Time 9.5 td(off) tf Unit μA CISS tr Max. Section(10) 19 Ω 162 VGS = 0V, VDS = 25V, f = 1MHz Rise Time 18 19 VDS = 325V, ID = 1A Turn-Off Delay Time pF ns 33 Fall Time 42 Control Section fOSC Switching Frequency ΔfOSC Switching Frequency DMAX Maximum Duty Cycle VSTART VSTOP IFB tS/S 92 -25°C ≤ TA ≤ 85°C Variation(10) UVLO Threshold Voltage Feedback Source Current Internal Soft-Start Time(10) 100 108 KHz ±5 ±10 % % Measured at 0.1 x VDS 55 60 65 VFB = GND 11 12 13 VFB = GND 7 8 9 VFB = GND 0.7 0.9 1.1 VFB = 4V 10 V mA ms Burst-Mode Section VBURH VBURL TJ = 25°C Burst-Mode Voltage VBUR(HYS) 0.5 0.6 0.7 V 0.3 0.4 0.5 V 100 200 300 mV 0.60 0.70 0.80 A Protection Section ILIM Peak Current Limit di/dt = 170mA/µs Current Limit Delay Time(10) TSD Thermal Shutdown Temperature(10) tCLD 600 ns 125 140 °C VSD Shutdown Feedback Voltage 5.5 6.0 6.5 V VOVP Over-Voltage Protection 18 19 20 V IDELAY Shutdown Delay Current 3.5 5.0 6.5 μA tLEB Leading-Edge Blanking Time VFB = 4V (10) 200 ns Total Device Section IOP Operating Supply Current (control part only) VCC = 14V 1 3 5 mA ICH Start-Up Charging Current VCC = 0V 0.70 0.85 1.00 mA Vstr Supply Voltage VCC = 0V 24 V VSTR Notes: 10. These parameters, although guaranteed, are not 100% tested in production. 11. Pulse test: Pulse width ≤ 300µs, duty ≤ 2%. 12. The ESD level of an existing product can be applied to FSQ110 because it has same ESD protection circuit. © 2007 Fairchild Semiconductor Corporation FSQ110 Rev. 1.0.0 www.fairchildsemi.com 5 FSQ110 — Green Mode Fairchild Power Switch (FPS™) Electrical Characteristics 1.2 1.2 1.0 1.0 Normalized Normalized These characteristic graphs are normalized at TA= 25°C. 0.8 0.6 0.4 0.2 0.0 -25 0.8 0.6 0.4 0.2 0 25 50 75 100 125 0.0 -25 150 0 Temperature [°C] 1.0 1.0 Normalized Normalized 1.2 0.8 0.6 0.4 0.2 100 125 150 0.8 0.6 0.4 0.2 0 25 50 75 100 125 0.0 -25 150 0 Temperature [°C] 25 50 75 100 125 150 Temperature [°C] Figure 6. Maximum Duty Cycle (DMAX) vs. TA Figure 7. Operating Supply Current (IOP) vs. TA 1.2 1.2 1.0 1.0 Normalized Normalized 75 Figure 5. Over-Voltage Protection (VOVP) vs. TA 1.2 0.8 0.6 0.4 0.8 0.6 0.4 0.2 0.2 0.0 -25 50 Temperature [°C] Figure 4. Operating Frequency (fOSC) vs. TA 0.0 -25 25 0 25 50 75 100 125 0.0 -25 150 Figure 8. Start Threshold Voltage (VSTART) vs. TA © 2007 Fairchild Semiconductor Corporation FSQ110 Rev. 1.0.0 0 25 50 75 100 125 150 Temperature [°C] Temperature [°C] Figure 9. Stop Threshold Voltage (VSTOP) vs. TA www.fairchildsemi.com 6 FSQ110 — Green Mode Fairchild Power Switch (FPS™) Typical Performance Characteristics (Control Part) 1.2 1.2 1.0 1.0 Normalized Normalized These characteristic graphs are normalized at TA= 25°C. 0.8 0.6 0.4 0.2 0.0 -25 0.8 0.6 0.4 0.2 0 25 50 75 100 125 0.0 -25 150 Temperature [°C] 0 25 50 75 100 125 150 Temperature [°C] Figure 10. Feedback Source Current (IFB) vs. TA Figure 11. Start-Up Charging Current (ICH) vs. TA 1.2 Normalized 1.0 0.8 0.6 0.4 0.2 0.0 -25 0 25 50 75 100 125 150 Temperature [°C] Figure 12. Peak Current Limit (ILIM) vs. TA © 2007 Fairchild Semiconductor Corporation FSQ110 Rev. 1.0.0 www.fairchildsemi.com 7 FSQ110 — Green Mode Fairchild Power Switch (FPS™) Typical Performance Characteristics (Continued) 1. Startup: In previous generations of Fairchild Power Switches (FPS™), the Vstr pin required an external resistor to the DC input voltage line. In this generation, the startup resistor is replaced by an internal highvoltage current source and a switch that shuts off 10ms after the supply voltage, VCC, goes above 12V. The source turns back on if VCC drops below 8V. 4. Protection Circuits: The FPS has several protective functions, such as Overload Protection (OLP), OverVoltage Protection (OVP), Under-Voltage Lockout (UVLO), and Thermal Shutdown (TSD). Because these protection circuits are fully integrated in the IC without external components, 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 (typically 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 (typically 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. VIN,dc ISTR Vstr Vcc