SG6846BCSZ Fairchild Semiconductor, SG6846BCSZ Datasheet
SG6846BCSZ
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SG6846BCSZ Summary of contents
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... SG6846BLSY -40 to +105°C SG6846BLSZ -40 to +105°C SG6846BCSY -40 to +105°C SG6846BCSZ -40 to +105°C For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html. © 2008 Fairchild Semiconductor Corporation SG6846B • Rev. 1.3.4 Description The highly integrated PWM controller, SG6846B, provides several features to enhance the performance of fly-back converters ...
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... Typical Application L EMI AC input Filter N VIN Block Diagram 0.9V/0.7V VIN 3 V -TH-G DD VDD 7 UVLO 16.5V/10.5V 23. 1.05V © 2008 Fairchild Semiconductor Corporation SG6846B • Rev. 1.3 VDD GATE 8 SENSE 6 GND SG6846B Figure 1. Typical Application Over Power Compersation 0.895-0.065 Internal BIAS Latch Debounce ...
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... Marking Information SG6846BFTP XXXXXXXXYWWV ※ Marking for SG6846BLSZ (Pb-free) SG6846BCSZ (Pb-free) ※ Marking for SG6846BLSY (Green-compound) SG6846BCSY (Green-compound) © 2008 Fairchild Semiconductor Corporation SG6846B • Rev. 1.3 OCP Latch OCP auto-recovery SOP Lead Free + ROHS Compatible Null = regular package XXXXXXXX: Wafer Lot Y: Year ...
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... VDD Power Supply 8 GATE Driver Output © 2008 Fairchild Semiconductor Corporation SG6846B • Rev. 1.3.4 Figure 5. Pin Configuration Description Ground. The signal from the external compensation circuit is fed into this pin. The PWM duty cycle is determined in response to the signal from this pin and the current- sense signal from pin 6 ...
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... 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 © 2008 Fairchild Semiconductor Corporation SG6846B • Rev. 1.3.4 Parameter <50°C SOP A SOP ...
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... Delay Time for Over-Current Protection D-OCP t Output Short Circuit Protection delay time D-Short t SS-65KHz Period During Soft Start Time t SS-130KHz © 2008 Fairchild Semiconductor Corporation SG6846B • Rev. 1.3.4 Test Condition for Short-Circuit DD V – 0.16V DD-ON GATE Open R = 26kΩ ...
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... FB-N Reduction Threshold Jitter Range V FB Voltage at f FB-G OSC-G f Frequency Variation vs Frequency Variation vs. Temperature f DT Deviation © 2008 Fairchild Semiconductor Corporation SG6846B • Rev. 1.3 Timing = 200ms OCP Figure 6. SG6846B OCP/SCP Logic Flow Diagram (Continued) Test Condition Center Frequency R = 26kΩ, V ...
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... The relationship between R © 2008 Fairchild Semiconductor Corporation SG6846B • Rev. 1.3.4 (Continued) Test Condition V = 15V 12V GATE = 1nF GATE = 1nF V = 20V DD ( 26kΩ I SG6846BLSY or SG6846BCSY 26kΩ SG6846BLSZ or SG6846BCSZ 26kΩ ( 26kΩ and R is: RT-OFF OFF OTP - LATCH 8 Min. Typ. Max. 80 ...
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... Temperature ( ℃ ) Figure 9. Startup Current (I OCP Threshold Voltage for Current Limit (V Temperature -40 -25 - Temperature (℃ ) Figure 11. OCP Threshold Voltage for Current Limit (V ) vs. Temperature STH1V-2/3 © 2008 Fairchild Semiconductor Corporation SG6846B • Rev. 1.3 Temperature DD- Figure 8. Turn-off Threshold Voltage (V DD- Temperature ...
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... Figure 15. Output Current of RT pin (I vs. Temperature PW M Turn-on Threshold Voltage (V 0.925 0.920 0.915 0.910 0.905 -40 -25 - Temperature ( ℃ ) Figure 17. PWM Turn-on Threshold Voltage (V vs. Temperature © 2008 Fairchild Semiconductor Corporation SG6846B • Rev. 1.3.4 (Continued Temperature OSC 8 7.2 8 7.0 8 6.8 8 6.6 8 6 110 125 ...
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... PWM frequency. Using a 26kΩ resistor results in a corresponding 65kHz switching frequency. The relationship between R frequency is: © 2008 Fairchild Semiconductor Corporation SG6846B • Rev. 1.3.4 f (kHz) PWM If an open-circuit or short-circuit to ground occurs at the RI pin, the internal protection circuit immediately shuts down the controller ...
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... Good placement and layout practices should be followed. Avoid long PCB traces and component leads. Compensation and filter components should be located near the SG6846B. © 2008 Fairchild Semiconductor Corporation SG6846B • Rev. 1.3.4 (Continued) Slope compensation 12 Figure 19 ...
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... R7 27KΩ +/-5% R6 330Ω +/-1% R19 102KΩ +/-1% R14 0Ω22 +/-5% R16, R17 1W 20Ω +/-5% R11 20KΩ +/-5% R12 100KΩ +/-5% R20 887KΩ +/-1% R22 10KΩ +/-1% © 2008 Fairchild Semiconductor Corporation SG6846B • Rev. 1.3.4 BD1 LF2 CX2 R12 ...
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... 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’ ...
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... Fairchild Semiconductor Corporation SG6846B • Rev. 1.3.4 15 www.fairchildsemi.com ...