SG6905SZ Fairchild Semiconductor, SG6905SZ Datasheet
SG6905SZ
Specifications of SG6905SZ
Available stocks
Related parts for SG6905SZ
SG6905SZ Summary of contents
Page 1
... Temperature Range SG6905SY -40°C to +105°C For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html. © 2007 Fairchild Semiconductor Corporation SG6905 • Rev. 1.1.2 Description The highly integrated SG6905 is specially designed for power supplies consisting of boost PFC and flyback PWM ...
Page 2
... Application Diagram © 2007 Fairchild Semiconductor Corporation SG6905 • Rev. 1.1.2 Figure 1. Typical Application 2 www.fairchildsemi.com ...
Page 3
... Block Diagram © 2007 Fairchild Semiconductor Corporation SG6905 • Rev. 1.1.2 Figure 2. Function Block Diagram 3 www.fairchildsemi.com ...
Page 4
... Marking Information Pin Configuration © 2007 Fairchild Semiconductor Corporation SG6905 • Rev. 1.1.2 F- Fairchild Logo Z- Plant Code X- Year Code Y- Week Code TT: Die-Run Code T: Package Type (S=SOP Green Package M: Manufacture Flow Code Figure 3. Marking Information Figure 4. Pin Configuration (Top View) 4 www.fairchildsemi.com ...
Page 5
... A large capacitor value results in a narrow bandwidth and hence improves the power factor. Input AC Current. Before startup, this input is used to provide startup current for V 20 IAC normal operation, this input is used to provide current reference for the multiplier. © 2007 Fairchild Semiconductor Corporation SG6905 • Rev. 1.1.2 ]KHz, where kΩ. For example ...
Page 6
... The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to absolute maximum ratings. Symbol T Operating Ambient Temperature A © 2007 Fairchild Semiconductor Corporation SG6905 • Rev. 1.1.2 Parameter < 50°C A Parameter 6 Min ...
Page 7
... Protection Threshold (with T V Recovery Level on VRMS RMS-UVP-2 Under-Voltage-Protection Delay Time t UVP (No Delay for Startup) UVP Occurs, the Interval from PFC Off t D-PWM to PWM Off © 2007 Fairchild Semiconductor Corporation SG6905 • Rev. 1.1.2 Conditions V =V – 0.16V DD DD-ON V =15V; OFC, DD OPWM open =24kΩ ...
Page 8
... Maximum Sink Current H Peak Current Limit Section I Constant Current Output P Peak Current Limit Threshold Voltage V PK Cycle-by-Cycle Limit (V t Propagation Delay PD-PFC t Leading-Edge Blanking Time LEB-PFC © 2007 Fairchild Semiconductor Corporation SG6905 • Rev. 1.1.2 Conditions +1. =24kΩ =20+I *0. =24KΩ ...
Page 9
... DCY Maximum Duty Cycle MAX PFC On/Off Section I Constant Current Output for PFC_ON Pin ON/OFF V Turn-Off Threshold Voltage OFF t Debounce Time of PFC_On/Off PFC_ON © 2007 Fairchild Semiconductor Corporation SG6905 • Rev. 1.1.2 Conditions Multiplier Range R =24kΩ =1.05V; RMS I =90µ =5V ...
Page 10
... Output-Voltage Low OL-PWM V Output-Voltage High OH-PWM t Rising Time r-pwm t Falling Time f-pwm Maximum Duty Cycle DCY MAXPWM © 2007 Fairchild Semiconductor Corporation SG6905 • Rev. 1.1.2 Conditions R =24kΩ I PFC_ON > VOFF PFC_ON > VOFF = 20KHz PFC_ON > VOFF S Gate Turn Off PFC_ON < VOFF OZ ...
Page 11
... V OTP Threshold Voltage OTP-OFF t OTP Debounce Time otp Soft-Start Section I Constant Current Output for Soft-Start SS R Discharge R D DSon © 2007 Fairchild Semiconductor Corporation SG6905 • Rev. 1.1.2 Conditions and PFC_ON Low FBPFC=2V I =1mA SINK R =24kΩ =24kΩ I RT=24kΩ ...
Page 12
... The PFC stage is disabled, whenever the voltage at PFC_ON pin exceeds V 2. The RDY Pin is reset, whenever the voltage at PFC_ON pin exceeds V occur reaches V DD DD-MIN Green Mode Function Item PFC_ON PFC_OFF © 2007 Fairchild Semiconductor Corporation SG6905 • Rev. 1.1.2 PWM GATE No change OFF OFF No change No change No change OFF ...
Page 13
... Temperature(°C) Figure 8. V DD-ON 68.00 66.80 65.60 64.40 63.20 62.00 -40 -25 - Temperature(°C) Figure 10. © 2007 Fairchild Semiconductor Corporation SG6905 • Rev. 1.1.2 10.00 8.80 7.60 6.40 5.20 4. 110 125 vs 11.00 10.40 9.80 9.20 8.60 8. 110 125 vs ...
Page 14
... Temperature(°C) Figure 14. V 120.00 104.00 88.00 72.00 56.00 40.00 -40 -25 - Temperature(°C) Figure 16. t R-PFC © 2007 Fairchild Semiconductor Corporation SG6905 • Rev. 1.1.2 (Continued) 2.80 2.76 2.72 2.68 2.64 2. 110 125 vs. T FBPFC A 98.00 97.00 96.00 95.00 94.00 93 ...
Page 15
... Temperature(°C) Figure 20. t R-PWM 83.00 81.00 79.00 77.00 75.00 73.00 -40 -25 - Temperature(°C) Figure 22. DCY MAX-PWM © 2007 Fairchild Semiconductor Corporation SG6905 • Rev. 1.1.2 (Continued) 0.95 0.93 0.91 0.89 0.87 0. 110 125 -40 vs 120.00 102.00 84.00 66.00 48.00 30 ...
Page 16
... R can be large to reduce power consumption. One AC 10µF capacitor should hold enough energy for successful startup. After startup, S1 switches so that © 2007 Fairchild Semiconductor Corporation SG6905 • Rev. 1.1.2 the current I helps consumption. and ...
Page 17
... Fairchild Semiconductor Corporation SG6905 • Rev. 1.1.2 There are two major concerns when compensating the voltage-loop transient response. Optimizing interaction between stability and transient response requires that the error amplifier’ ...
Page 18
... Figure 29. Peak Current Control Loop When the IPWM voltage across the sense resistor reaches the threshold voltage (0.9V), the OPWM is turned off after a small propagation delay t © 2007 Fairchild Semiconductor Corporation SG6905 • Rev. 1.1.2 To improve oscillation, a synchronized positive-going ramp is inserted at every switching cycle ...
Page 19
... 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’ ...
Page 20
... Fairchild Semiconductor Corporation SG6905 • Rev. 1.1.2 20 www.fairchildsemi.com ...