Green Mode Fairchild Power Switch (FPS)

www.fairchildsemi.com FSDM07652RB Features Green Mode Fairchild Power Switch (FPSTM) • Internal Avalanche Rugged Sense FET • Advanced Burst-Mode operation consumes under 1 W at 240VAC & 0.5W load • Precision Fixed Operating Frequency (66kHz) • Internal Start-up Circuit • Improved Pulse by Pulse Current Limiting • Over Voltage Protection (OVP) • Over Load Protection (OLP) • Internal Thermal Shutdown Function (TSD) • Auto-Restart Mode • Under Voltage Lock Out (UVLO) with hysteresis • Low Operating Current (2.5mA) • Built-in Soft Start OUTPUT POWER TABLE 230VAC ±15%(3) PRODUCT FSDM0565RB FSDM07652RB Adapter(1) 60W 70W Open Frame(2) 70W 80W 85-265VAC Adapter(1) 50W 60W Open Frame(2) 60W 70W Table 1. Maximum Output Power Notes: 1. Typical continuous power in a non-ventilated enclosed adapter measured at 50°C ambient. 2. Maximum practical continuous power in an open frame design at 50°C ambient. 3. 230 VAC or 100/115 VAC with doubler. Application • SMPS for LCD monitor and STB • Adaptor Typical Circuit Description The FSDM07652RB is an integrated Pulse Width Modulator (PWM) and Sense FET specifically designed for high performance offline Switch Mode Power Supplies (SMPS) with minimal external components. This device is an integrated high voltage power switching regulator which combine an avalanche rugged Sense FET with a current mode PWM control block. The PWM controller includes 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 discrete MOSFET and PWM controller solution, it can reduce total cost, component count, size and weight simultaneously increasing efficiency, productivity, and system reliability. This device is a basic platform well suited for cost effective designs of flyback converters. AC IN DC OUT Vstr PWM Vfb Drain Vcc Source Figure 1. Typical Flyback Application Rev.1.0.4 ©2004 Fairchild Semiconductor Corporation FSDM07652RB Internal Block Diagram Vcc 3 N.C 5 0.5/0.7V + Vstr 6 Drain 1 Istart Vref 8V/12V Vcc good Internal Bias Vcc Idelay Vref OSC IFB 2.5R PWM S Q FB 4 R Q Soft start R Gate driver LEB VSD Vcc S Q 2 GND Vovp TSD Vcc good R Q VCL Figure 2. Functional Block Diagram of FSDM07652RB 2 FSDM07652RB Pin Definitions Pin Number 1 2 3 Pin Name Drain GND Vcc Pin Function Description This pin is the high voltage power Sense FET drain. It is designed to drive the transformer directly. This pin is the control ground and the Sense FET source. This pin is the positive supply voltage input. During start up, the power is supplied by an internal high voltage current source that is connected to the Vstr pin. When Vcc reaches 12V, the internal high voltage current source is disabled and the power is supplied from the auxiliary transformer winding. 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 over load protection is activated resulting in shutdown of the FPSTM. This pin is connected directly to the high voltage DC link. At startup, the internal high voltage current source supplies internal bias and charges the external capacitor that is connected to the Vcc pin. Once Vcc reaches 12V, the internal current source is disabled. 4 Vfb 5 6 N.C Vstr Pin Configuration TO-220F-6L 6.Vstr 5.N.C. 4.Vfb 3.Vcc 2.GND 1.Drain Figure 3. Pin Configuration (Top View) 3 FSDM07652RB Absolute Maximum Ratings (Ta=25°C, unless otherwise specified) Parameter Vstr Max Voltage Pulsed Drain current (Tc=25°C)(1) Continuous Drain Current(Tc=25°C) Continuous Drain Current(Tc=100°C) Single pulsed avalanche energy (2) Single pulsed avalanche current (3) Supply voltage Input voltage range Total power dissipation(Tc=25°C) Operating junction temperature Operating ambient temperature Storage temperature range Symbol VSTR IDM ID EAS IAS VCC VFB PD(Watt H/S) Tj TA TSTG Value 650 28 7 4.5 370 20 -0.3 to VCC 62 Internally limited -25 to +85 -55 to +150 Unit V ADC A A mJ A V V W °C °C °C Notes: 1. Repetitive rating: Pulse width limited by maximum junction temperature 2. L=14mH, starting Tj=25°C 3. L=13uH, starting Tj=25°C Thermal Impedance Parameter Junction-to-Ambient Thermal Junction-to-Case Thermal Symbol Value 46.40 2.49 Unit °C/W °C/W θJA(1) θJC(2) Notes: 1. Free standing with no heat-sink under natural convection. 2. Infinite cooling condition - Refer to the SEMI G30-88. 4 FSDM07652RB Electrical Characteristics (Ta = 25°C unless otherwise specified) Parameter Sense FET SECTION Drain source breakdown voltage BVDSS VGS = 0V, ID = 250µA VDS = 650V, VGS = 0V Zero gate voltage drain current Static drain source on resistance (1) Output capacitance Turn on delay time Rise time Turn off delay time Fall time CONTROL SECTION Initial frequency Voltage stability Temperature stability (2) Maximum duty cycle Minimum duty cycle Start threshold voltage Stop threshold voltage Feedback source current Soft-start time Leading Edge Blanking time BURST MODE SECTION Burst Mode Voltages (2) PROTECTION SECTION Peak current limit (4) Over voltage protection Thermal shutdown temperature (2) Shutdown feedback voltage Shutdown delay current IOVER VOVP TSD VSD IDELAY VFB ≥ 5.5V VFB=5V VFB=5V, VCC=14V 2.2 18 130 5.5 2.8 2.5 19 145 6.0 3.5 2.8 20 160 6.5 4.2 A V °C V µA VBURH VBURL Vcc=14V Vcc=14V 0.7 0.5 V V FOSC FSTABLE ∆FOSC DMAX DMIN VSTART VSTOP IFB TS TLEB VFB=GND VFB=GND VFB=GND Vfb=3 VFB = 3V 13V ≤ Vcc ≤ 18V -25°C ≤ Ta ≤ 85°C 60 0 0 75 11 7 0.7 66 1 ±5 80 12 8 0.9 10 250 72 3 ±10 85 0 13 9 1.1 15 kHz % % % % V V mA ms ns IDSS VDS= 520V VGS = 0V, TC = 125°C VGS = 10V, ID = 2.5A VGS = 0V, VDS = 25V, f = 1MHz VDD= 325V, ID= 5A (MOSFET switching time is essentially independent of operating temperature) 650 1.4 100 22 60 115 65 500 500 1.6 ns V µA µA Ω Symbol Condition Min. Typ. Max. Unit RDS(ON) COSS TD(ON) TR TD(OFF) TF pF 5 FSDM07652RB TOTAL DEVICE SECTION IOP Operating supply current (5) VFB=GND, VCC=14V VFB=GND, VCC=10V VFB=GND, VCC=18V 2.5 5 mA IOP(MIN) IOP(MAX) Notes: 1. Pulse test : Pulse width ≤ 300µS, duty ≤ 2% 2. These parameters, although guaranteed at the design, are not tested in mass production. 3. These parameters, although guaranteed, are tested only in EDS(wafer test) process. 4. These parameters indicate the inductor current. 5. This parameter is the current flowing into the control IC. 6 FSDM07652RB Comparison Between FS6M07652RTC and FSDM07652RB Function Soft-Start FS6M07652RTC Adjustable soft-start time using an external capacitor FSDM07652RB FSDM07652RB Advantages Internal soft-start with • Gradually increasing current limit typically 10ms (fixed) during soft-start further reduces peak current and voltage component stresses • Eliminates external components used for soft-start in most applications • Reduces or eliminates output overshoot Burst Mode Operation • Built into controller • Built into controller • Improve light load efficiency • Output voltage fixed • Reduces no-load consumption • Output voltage drops to around half 7 FSDM07652RB Typical Performance Characteristics (These Characteristic Graphs are Normalized at Ta= 25°C) 1. 2 1. 0 0. 8 0. 6 0. 4 0. 2 0. 0 -50 -25 0 25 50 75 100 125 Junction Temperature(℃) 1. 2 1. 0 Start Thershold Voltage (Normalized to 25℃) 0. 8 0. 6 0. 4 0. 2 0. 0 -50 -25 0 25 50 75 100 125 Junction Temperature(℃) Operating Current (Normalized to 25℃) Operating Current vs. Temp Start Threshold Voltage vs. Temp 1.2 1.0 Stop Threshold Voltage (Normalized to 25℃) Initial Frequency (Normalized to 25℃) 1.2 1.0 0.8 0.6 0.4 0.2 0.0 0.8 0.6 0.4 0.2 0.0 -50 -25 0 25 50 75 100 125 Junction Temperature(℃) -50 -25 0 25 50 75 100 125 Junction Temperature(℃) Stop Threshold Voltage vs. Temp Operating Freqency vs. Temp 1.2 1.0 Maximum Duty Cycle (Normalized to 25℃) 1.2 1.0 FB Source Current (Normalized to 25℃) -50 -25 0 25 50 75 100 125 0.8 0.6 0.4 0.2 0.0 Junction Temperature(℃) 0.8 0.6 0.4 0.2 0.0 -50 -25 0 25 50 75 100 125 Junction Temperature(℃) Maximum Duty vs. Temp Feedback Source Current vs. Temp 8 FSDM07652RB Typical Performance Characteristics (Continued) (These Characteristic Graphs are Normalized at Ta= 25°C) 1.2 1.0 Shutdown FB Voltage (Normalized to 25℃) 0.8 0.6 0.4 0.2 0.0 -50 -25 0 25 50 75 100 125 Junction Temperature(℃) 1.2 1.0 Shutdown Delay Current (Normalized to 25℃) 0.8 0.6 0.4 0.2 0.0 -50 -25 0 25 50 75 100 125 Junction Temperature(℃) ShutDown Feedback Voltage vs. Temp 1. 2 1. 0 0. 8 0. 6 0. 4 0. 2 0. 0 -50 -25 0 25 50 75 100 125 ShutDown Delay Current vs. Temp 1.2 1.0 0.8 0.6 0.4 0.2 0.0 -50 -25 0 25 50 75 100 125 Junction Temperature(℃) Junction Temperature(℃) Over Voltage Protection vs. Temp 1.2 1.0 0.8 0.6 0.4 0.2 0.0 -50 -25 0 25 50 75 100 125 Junction Temperature(℃) Burst Mode Enable Voltage (Normalized to 25℃) Over Voltage Protection (Normalized to 25℃) Burst Mode Enable Voltage vs. Temp 1.2 1.0 Over Current Limit (Normalized to 25℃) 0.8 0.6 0.4 0.2 0.0 -50 -25 0 25 50 75 100 125 Junction Temperature(℃) Burst Mode Disable Voltage (Normalized to 25℃) Burst Mode Disable Voltage vs. Temp Current Limit vs. Temp 9 FSDM07652RB Typical Performance Characteristics (Continued) (These Characteristic Graphs are Normalized at Ta= 25°C) 1.2 1.0 Soft Start Time (Normalized to 25℃) 0.8 0.6 0.4 0.2 0.0 -50 -25 0 25 50 75 100 125 Junction Temperature(℃) Soft Start Time vs. Temp 10 FSDM07652RB Functional Description 1. Startup : In previous generations of Fairchild Power Switches (FPSTM) the Vcc pin had an external start-up resistor to the DC input