FAN6861 Fairchild Semiconductor, FAN6861 Datasheet

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FAN6861

Manufacturer Part Number
FAN6861
Description
A highly integrated PWM controller, FAN6861 provides several features to enhance the performance of flyback converters
Manufacturer
Fairchild Semiconductor
Datasheet
© 2009 Fairchild Semiconductor Corporation
FAN6861 • Rev. 1.0.1
FAN6861
Low-Cost, Highly Integrated, Green-Mode PWM
Controller for Peak Power Management
Features
Applications
Ordering Information
FAN6861TY
Part Number
For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
Low Startup Current: 15µA Maximum
Green-Mode and Burst-Mode Operation for Low
Standby Power Consumption
Internal Soft Start: 10ms
Frequency Hopping for EMI Reduction
Peak-Current Mode Control with Cycle-by-Cycle
Current Limiting
Constant Output Power Limit (Full AC Input Range)
Built-in Slope Compensation
Two-Level Over-Current Protection (OCP) with
Delayed Shutdown (780ms) for Peak Power
Management
Open-Loop / Over-Load Protection (OLP)
V
Programmable Over-Temperature Protection (OTP)
Switched Mode Power Supply (SMPS) with Motor
Load; such as for printer, scanner, motor drivers,
etc.
AC/DC Adapters
Open-Frame SMPS
DD
Over-Voltage Protection (OVP)
Operating Temperature Range
-40 to +105°C
Description
Highly
optimized for applications with motor load; such as
printer and scanner, which inherently impose some kind
of overload condition on the power supply during
acceleration mode. The two-level OCP function allows
the SMPS to stably deliver peak power during the motor
acceleration mode without causing premature shutdown
and while protecting the SMPS from overload condition.
The green-mode and burst-mode functions with a low
operating current (2.2mA maximum in green mode)
maximize the light load efficiency so that the power
supply can meet most stringent standby power
regulations.
The frequency-hopping function helps reduce electro-
magnetic interference (EMI) of a power supply by
spreading the energy over a wider frequency range.
The constant power limit function; minimizes the
components stress in abnormal condition and helps
designer to optimize the power stage more easily.
Many protection functions such; as OCP, OLP, OVP
and OTP, are fully integrated into FAN6861, which
improves the SMPS reliability without increasing the
system cost.
Eco Status
Green
integrated
PWM
Package
SSOT-6
controller,
Packing Method
Tape & Reel
FAN6861
May 2009
www.fairchildsemi.com
is

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FAN6861 Summary of contents

Page 1

... The constant power limit function; minimizes the components stress in abnormal condition and helps designer to optimize the power stage more easily. Many protection functions such; as OCP, OLP, OVP and OTP, are fully integrated into FAN6861, which improves the SMPS reliability without increasing the system cost. Eco Status -40 to +105° ...

Page 2

... Typical Application Block Diagram OVP 25V Latch-Off release 4V Internal VDD 5 BIAS UVLO 17.5V/9. 0.7V © 2009 Fairchild Semiconductor Corporation FAN6861 • Rev. 1.0.1 Figure 1. Typical Application GND 1 Auto OLP Recovery OCP Protection OVP Latch-off OTP Protection OSC Green Mode Controller FB SENSE ...

Page 3

... This pin is the positive supply voltage input. The totem-pole output driver to drive the gate of power MOSFET. Soft driving waveform is 6 GATE implemented to reduce EMI. © 2009 Fairchild Semiconductor Corporation FAN6861 • Rev. 1.0.1 AAR: FAN6861 TT: Wafer lot code : Year code • • • ...

Page 4

... Fairchild does not recommend exceeding them or designing to Absolute Maximum Ratings. Symbol T Operating Ambient Temperature A © 2009 Fairchild Semiconductor Corporation FAN6861 • Rev. 1.0.1 Parameter <50°C A Human Body Model, JESD22-A114 Charge Device Model, JESD22-C101 Parameter 4 Min ...

Page 5

... STHVA V OCP Trigger Level OCP V Slope Compensation SLOPE t Soft-Start Time SS FB Pin Protection Delay Time for Peak t D-OCP Loading © 2009 Fairchild Semiconductor Corporation FAN6861 • Rev. 1.0.1 Parameter Test Condition V TH-ON With 1nF Load on Gate, V GATE Open Green Mode Duty > ...

Page 6

... Threshold Voltage for Over-Temperature V OTP1 Protection t Over-Temperature Latch-Off Debounce DOTP-LATCH Second Threshold Voltage for Over- V OTP2 Temperature Protection Second Over-Temperature Latch-Off t DOTP2-LATCH Debounce © 2009 Fairchild Semiconductor Corporation FAN6861 • Rev. 1.0.1 (Continued) Test Condition Center V > FB-N Frequency ≥ FB-N Jitter Range ...

Page 7

... Threshold Voltage for Over-Temperature V OTP1 Protection t Over-Temperature Latch-Off Debounce DOTP-LATCH Second Threshold Voltage for Over- V OTP2 Temperature Protection t Second Over-Temperature Latch-Off DOTP2-LATCH Debounce © 2009 Fairchild Semiconductor Corporation FAN6861 • Rev. 1.0.1 (Continued) Test Condition V = 15V 12V GATE = 1nF GATE = 1nF V = 20V DD ...

Page 8

... Temperature (℃) Figure 9. OCP Trigger Level (V © 2009 Fairchild Semiconductor Corporation FAN6861 • Rev. 1.0.1 10 9.8 9.6 9.4 9.2 9 8.8 50 ℃ 75 ℃ 85 ℃ 100 ℃ 125 ℃ -40 ℃ ) Figure 6. Turn-Off Threshold Voltage (V DD- ...

Page 9

... Temperature (℃) OTP2 0.72 0.715 0.71 0.705 0.7 0.695 0.69 -40 ℃ -30 ℃ -15 ℃ 0 ℃ 25 ℃ Temperature (℃) Figure 15. Second Threshold Voltage for Over- Temperature Protection (V © 2009 Fairchild Semiconductor Corporation FAN6861 • Rev. 1.0.1 2.3 2.25 2.2 2.15 2.1 2. ℃ 75 ℃ 85 ℃ 100 ℃ 125 ℃ -40 ℃ Figure 12. FB Voltage at f 1.1 1.05 1 ...

Page 10

... PWM frequency starts to linearly decrease from 65KHz to 22kHz to reduce the switching losses decreases below V (2.2V), the switching frequency FB-G is fixed at 22.5kHz and FAN6861 enters into deep green mode, where the operating current reduces to 2.2mA (maximum), further reducing the standby power consumption decreases below V FB FAN6861 enters into burst-mode operation ...

Page 11

... Operation Situation Figure 21. Auto Restart Operation Two-Level Over-Current Protection (OCP) FAN6861 has two levels of over-current protection thresholds. One is for pulse-by-pulse current limit, which turns off MOSFET for the remainder of the switching cycle when the sensing voltage of MOSFET drain current reaches the threshold. The other threshold ...

Page 12

... Figure 25. Current Sense R-C Filter Soft-Start The FAN6861 has an internal soft-start circuit that increases pulse-by-pulse inverting input voltage slowly after it starts. The typical soft-start time is 10ms. The pulsewidth to the power MOSFET is progressively increased to establish the correct working conditions for transformers, rectifier diodes, and capacitors ...

Page 13

... Typical Application Circuit (Flyback Converter for Printer Application) Application Fairchild Devices SMPS for Printer FAN6861 Transformer Core: EF-25/13/11 Primary-Side Inductance: 500µH © 2009 Fairchild Semiconductor Corporation FAN6861 • Rev. 1.0.1 Input Voltage Range 90~264V AC Figure 26. Schematic of Application Circuit Figure 27. Transformer Structure Output 32V/0 ...

Page 14

... 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 FAN6861 • Rev. 1.0.1 Figure 28. 6-Pin SSOT-6 Package 14 www.fairchildsemi.com ...

Page 15

... Fairchild Semiconductor Corporation FAN6861 • Rev. 1.0.1 15 www.fairchildsemi.com ...

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