FAN6982 Fairchild Semiconductor, FAN6982 Datasheet

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FAN6982

Manufacturer Part Number
FAN6982
Description
The FAN6982 is a 14-pin, Continuous Conduction Mode (CCM) PFC controller IC intended for Power Factor Correction (PFC) pre-regulators
Manufacturer
Fairchild Semiconductor
Datasheet

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© 2009 Fairchild Semiconductor Corporation
FAN6982 • Rev. 1.0.3
FAN6982
CCM Power Factor Correction Controller
Features
Applications
Ordering Information
FAN6982MY
Part Number
Continuous Conduction Mode
Innovative Switching-Charge Multiplier-Divider
Average-Current-Mode for Input-Current Shaping
TriFault Detect™ Prevent Abnormal Operation for
Feedback Loop
Power-On Sequence Control
Soft-Start Capability
Brownout Protection
Cycle-by-Cycle Peak Current Limiting.
Improves Light-Load Efficiency
Fulfills Class-D Requirements of IEC 1000-3-2
Wide Range Universal AC Input Voltage
Maximum Duty Cycle 97%
V
Desktop PC Power Supply
Internet Server Power Supply
LCD TV/Monitor Power Supply
DC Motor Power Supply
DD
Under-Voltage Lockout (UVLO)
Operating Temperature Range
-40°C to +105°C
14-Pin Small Outline Package (SOP)
Description
The FAN6982 is a 14-pin, Continuous Conduction Mode
(CCM) PFC controller IC intended for Power Factor
Correction (PFC) pre-regulators. The FAN6982 includes
circuits for the implementation of leading edge, average
current, “boost”-type power factor correction, and
results in a power supply that fully complies with the
IEC1000-3-2 specification.
A TriFault Detect™ function helps reduce external
components and provides full protection for feedback
loops such as open, short, and over voltage. An over-
voltage comparator shuts down the PFC stage in the
event of a sudden load decrease. The RDY signal can
be used for power-on sequence control. The EN
function can choose to enable or disable the range
function. FAN6982 also includes PFC soft-start, peak
current limiting, and input voltage brownout protection.
Package
Packing Method
Tape & Reel
July 2010
www.fairchildsemi.com

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FAN6982 Summary of contents

Page 1

... Fairchild Semiconductor Corporation FAN6982 • Rev. 1.0.3 Description The FAN6982 is a 14-pin, Continuous Conduction Mode (CCM) PFC controller IC intended for Power Factor Correction (PFC) pre-regulators. The FAN6982 includes circuits for the implementation of leading edge, average current, “boost”-type power factor correction, and results in a power supply that fully complies with the IEC1000-3-2 specification ...

Page 2

... Application Diagram © 2009 Fairchild Semiconductor Corporation FAN6982 • Rev. 1.0.3 Figure 1. Typical Application 2 www.fairchildsemi.com ...

Page 3

... Detect Comparator FBPFC 2.5V 0. Range 6 VRMS IAC Gain Modulator 3 ISENSE 7 RT/CT Marking Information © 2009 Fairchild Semiconductor Corporation FAN6982 • Rev. 1.0.3 1 IEA 0.5V PFC UVP 2.75V/2.5V PFC OVP V DD 28V/27V V OVP -1.15V I PFC ILIMIT SENSE 1.05V/1. UVP ...

Page 4

... PFC I 4 VRMS Line-Voltage Detection. The pin is used for PFC multiplier. Ready Signal. This pin controls the power-on sequence. Once the FAN6982 is turned on and 5 RDY the FBPFC voltage exceeds in 2.4V, the RDY pin pulls LOW impedance. If the FBPFC voltage is lower than 1.15V, the RDY pin pulls HIGH impedance. ...

Page 5

... Fairchild does not recommend exceeding them or designing to Absolute Maximum Ratings. Symbol T Operating Ambient Temperature A © 2009 Fairchild Semiconductor Corporation FAN6982 • Rev. 1.0.3 Parameter < 50°C A Human Body Model, JESD22-A114 Charged Device Model, ...

Page 6

... FBPFC Voltage Level to Pull V FBPFC-RD Low Impedance with RDY Pin Hysteresis △V FBPFC-RD Leakage Current of RDY I RDY-LEK High Impedance V RDY Low Voltage RDY-L © 2009 Fairchild Semiconductor Corporation FAN6982 • Rev. 1.0.3 = 25° =27kΩ, and Conditions V =V -0.1V; OPFC Open DD ...

Page 7

... EN-L Range V RMS AC Voltage Low VRMS-L V RMS AC Voltage High VRMS-H V VEA Low VEA-L V VEA High VEA-H I Source Current from FBPFC TC © 2009 Fairchild Semiconductor Corporation FAN6982 • Rev. 1.0.3 (Continued) = 25° =27kΩ, and Conditions ( =25° =3.75V at T ...

Page 8

... FBPFC_OPEN PFC Feedback Under- V PFC-UVP Voltage Protection Notes: 3. This parameter, although guaranteed by design, is not 100% production tested. 4. This gain is the maximum gain of modulation with a given V © 2009 Fairchild Semiconductor Corporation FAN6982 • Rev. 1.0.3 (Continued) = 25° =27kΩ, and C =1000pF ...

Page 9

... Figure 9. V vs. Temperature RMS-UVL Figure 11. V FBPFC-RD © 2009 Fairchild Semiconductor Corporation FAN6982 • Rev. 1.0.3 29.0 28.8 28.6 28.4 28.2 28.0 27.8 27.6 27.4 27.2 27.0 - 110 ...

Page 10

... Figure 19. V vs. Temperature O(GM) © 2009 Fairchild Semiconductor Corporation FAN6982 • Rev. 1.0.3 (Continued ...

Page 11

... Figure 21. V GATE-CLAMP © 2009 Fairchild Semiconductor Corporation FAN6982 • Rev. 1.0.3 (Continued vs. Temperature ...

Page 12

... Functional Description Oscillator The internal oscillator frequency of FAN6982 is determined by the timing resistor and capacitor on the RT/CT pin, but note that the optimum operation for FAN6982 is between 50 and 75kHz. The frequency of the internal oscillator is given by OSC ⋅ ⋅ 0.56 360 The dead time for the PFC gate drive signal is ...

Page 13

... Once the VRMS pin voltage is lower than 1.05V, the 2.5V R FB2 PFC stage is shutdown to protect the system from over current. FAN6982 starts up the boost stage once the VRMS voltage increases above 1.9V. TriFault Detect™ To improve power supply reliability, reduce system component count, and simplify compliance to UL 1950 safety standards ...

Page 14

... Figure 30. PFC Soft-Start © 2009 Fairchild Semiconductor Corporation FAN6982 • Rev. 1.0.3 RDY Function The FAN6982 RDY function, is shown in Figure 31, is controlled by voltage of FBPFC. If the voltage of FBPFC is over than 96% of 2.5V, the RDY pin is connected to SGND. If the FBPFC is under the 46% of 2.5V, the RDY appears open-drain situation. Usually the capacitor is parallel with the RDY pin to prevent the layout noise ...

Page 15

... 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’s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/. © 2009 Fairchild Semiconductor Corporation FAN6982 • Rev. 1.0.3 Figure 32. 14-Pin Small Outline Package (SOIC) 15 www.fairchildsemi.com ...

Page 16

... Fairchild Semiconductor Corporation FAN6982 • Rev. 1.0.3 16 www.fairchildsemi.com ...

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