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FAN6861 -- Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management
May 2009
FAN6861 Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management
Features
Low Startup Current: 15A 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) VDD Over-Voltage Protection (OVP) Programmable Over-Temperature Protection (OTP)
Description
Highly integrated PWM controller, FAN6861 is 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 electromagnetic 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.
Applications
Switched Mode Power Supply (SMPS) with Motor Load; such as for printer, scanner, motor drivers, etc. AC/DC Adapters Open-Frame SMPS
Ordering Information
Part Number
FAN6861TY
Operating Temperature Range
-40 to +105C
Eco Status
Green
Package
SSOT-6
Packing Method
Tape & Reel
For Fairchild's definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
(c) 2009 Fairchild Semiconductor Corporation FAN6861 * Rev. 1.0.1
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FAN6861 -- Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management
Typical Application
Figure 1. Typical Application
Block Diagram
GND 1 OVP
25V
OLP OCP OVP OTP
Auto Recovery Protection Latch-off Protection Soft Driver S R OSC Green Mode Controller Vlimit ramp (Include Soft-Start)
VDD
6 Q
GATE
Latch-Off release
4V Internal BIAS
VDD
5
UVLO
FB
Blanking Circuit Slope Compensation 3R R 0.5V 5.2V
4
SENSE
17.5V/9.5V
OCP
OCP Delay
SENSE
2
FB
OTP1 Debounce IRT 1V OTP2 Debounce 0.7V
OTP
OLP
OLP Delay 4.6V
RT
3
Figure 2. Block Diagram
(c) 2009 Fairchild Semiconductor Corporation FAN6861 * Rev. 1.0.1
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FAN6861 -- Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management
Marking Information
AAR: FAN6861 TT: Wafer lot code * * *: Year code _ _ _: Week code
Figure 3. Top Mark
Pin Configuration
Figure 4. Pin Configuration
Pin Definitions
Pin #
1 2
Name Description
GND FB Ground. 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 is higher than 4.6V for longer than 780ms, the overload protection is triggered and PWM output is disabled. This pin is for programmable over-temperature protection. An external NTC thermistor is connected between this pin and GND pin. Once the voltage of this pin drops below a threshold of 0.7V, PWM output is disabled. This pin is for current sense. This pin senses the voltage across a resistor. The voltage of this pin is compared with the feedback information determining the PWM duty cycle. This pin is the positive supply voltage input. The totem-pole output driver to drive the gate of power MOSFET. Soft driving waveform is implemented to reduce EMI.
3 4 5 6
RT SENSE VDD GATE
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FAN6861 -- Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. All voltage values, except differential voltages, are given with respect to GND pin.
Symbol
VDD VL PD JC TJ TSTG TL ESD Supply Voltage
Parameter
Input Voltage to FB, SENSE, VIN, RT,RI Pin Power Dissipation at TA<50C Thermal Resistance (Junction-to-Case) Operating Junction Temperature Storage Temperature Range Lead Temperature, Wave Soldering, 10 Seconds Electrostatic Discharge Capability Human Body Model, JESD22-A114 Charge Device Model, JESD22-C101
Min.
-0.3
Max.
30 7.0 300 208.4
Unit
V V mW C/W C C C kV
-40 -55
+150 +150 +260 4.5 1.0
Recommended Operating Conditions
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
TA
Parameter
Operating Ambient Temperature
Min.
-40
Max.
+105
Unit
C
(c) 2009 Fairchild Semiconductor Corporation FAN6861 * Rev. 1.0.1
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FAN6861 -- Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management
Electrical Characteristics
VDD = 15V and TA = 25C, unless otherwise noted.
Symbol
VDD Section VDD-OP VDD-ON VDD-OFF VDD-SCP VDD-OVP VDD-LH IDD-ST IDD-OP IDD-BM VDD-OVP tD-VDDOVP IDD-LH AV ZFB VFBO VFB-OLP tD-OLP tD-SCP tPD tLEB VSTHFL VSTHVA VOCP VSLOPE tSS tD-OCP
Parameter
Continuously Operating Voltage Turn-On Threshold Voltage Turn-Off Voltage Threshold Voltage for Output Short-Circuit Protection (SCP) VDD Over-Voltage Protection (Latch-Off) Threshold Voltage for Latch-Off Release Startup Current Normal Operating Supply Current Green-Mode Operating Supply Current VDD Over-Voltage Protection (Latch-Off) VDD OVP Debounce Time Latch-Off Holding Current Input Voltage to Current Sense Attenuation Input Impedance FB Pin Open Voltage Threshold Voltage for Open-loop Protection Open-Loop Protection Delay Time Short-Circuit Protection Delay Time Delay to Output Leading-Edge Blanking Time Flat Threshold Voltage for Current Limit Valley Threshold Voltage for Current Limit OCP Trigger Level Slope Compensation Soft-Start Time FB Pin Protection Delay Time for Peak Loading
Test Condition
Min.
Typ.
Max.
24
Unit
V V V V V V A mA mA V s A V/V k V V ms ms ns ns V V V V ms ms
16.5 8.5
17.5 9.5
18.5 10.5
VDD-OFF VDD-OFF VDD-OFF +0.5 +1.0 +1.5 24 3 VTH-ON - 0.16V With 1nF Load on Gate, VFB VFB-N GATE Open, VFB = VFB-G 24 100 VDD = 5V At Green Mode 25 1/4.5 14 5.0 4.3 700 20 25 170 40 1/4.0 16 5.2 4.6 780 25 100 270 Duty > 51% Duty = 0% Duty = DCYMAX 0.85 0.65 0.47 0.30 7.5 700 360 0.89 0.70 0.50 0.33 10.0 780 0.93 0.75 0.53 0.36 12.5 860 25 4 8 3 26 5 15 4 2.2 26 240 55 1/3.5 18 5.4 4.9 860 30 250
Feedback Input Section
Current Sense Section
Continued on following page...
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FAN6861 -- Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management
Electrical Characteristics (Continued)
VDD = 15V and TA = 25C, unless otherwise noted.
Symbol
Oscillator Section
Parameter
Center Frequency Jitter Range
Test Condition
Min.
Typ.
Max.
Unit
VFB > VFB-N VFB VFB-N VFB = VFB-G VFB VFB-N VFB = VFB-G
60 3.7 1.27 3.9 10.2 18.0 2.60 2.0
65 4.2 1.45 4.4 11.5 22.5 2.85 2.2 65
70 4.7 1.63 4.9 12.8 25.0 3.10 2.4 ms ms kHz V V Hz/mV 2.1 2.00 2 V % % kHz
fOSC
Normal PWM Frequency
thop-1 thop-3 fOSC-G VFB-N VFB-G SG VFB-ZDC fDV fDT
Jitter Period 1 Jitter Period 3 Green-Mode Minimum Frequency Beginning of Green-On Mode at FB Level Beginning of Green-Off Mode at FB Level Pin, FB Voltage Pin, FB Voltage
Slope for Green-Mode Modulation FB Threshold Voltage for Zero-duty Frequency Variation vs. VDD Deviation Frequency Variation vs. Temperature Deviation Maximum Duty Cycle Output Voltage LOW Output Voltage HIGH Rising Time Falling Time Gate Output Clamping Voltage Output Current of RT Pin RT Pin Open Voltage Threshold Voltage for Over-Temperature Protection Over-Temperature Latch-Off Debounce Second Threshold Voltage for OverTemperature Protection Second Over-Temperature Latch-Off Debounce VFB = VFB-N VFB = VFB-G 0.92 15 40 0.65 50 VDD = 15V, IO = 50mA VDD = 12V, IO = 50mA GATE = 1nF GATE = 1nF VDD = 20V 15.00 90 8 VDD = 11.5V to 20V TA = -30 to 85C 1.7 0
1.9 0.02
PWM Output Section DCYMAX VOL VOH tR tF VCLAMP IRT VRTO VOTP1 tDOTP-LATCH VOTP2 tDOTP2-LATCH 65 70 75 1.5 % V V 230 30 16.75 99 3.7 1.00 17 51 0.70 100 1.08 19 62 0.75 150 V s 18.50 108 ns ns V A V V ms
Over-Temperature Protection (OTP) Section
(c) 2009 Fairchild Semiconductor Corporation FAN6861 * Rev. 1.0.1
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FAN6861 -- Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management
Electrical Characteristics (Continued)
VDD = 15V and TA = 25C, unless otherwise noted.
Symbol
PWM Output Section DCYMAX VOL VOH tR tF VCLAMP IRT VRTO VOTP1 tDOTP-LATCH VOTP2 tDOTP2-LATCH
Parameter
Maximum Duty Cycle Output Voltage LOW Output Voltage HIGH Rising Time Falling Time Gate Output Clamping Voltage Output Current of RT Pin RT Pin Open Voltage Threshold Voltage for Over-Temperature Protection Over-Temperature Latch-Off Debounce Second Threshold Voltage for OverTemperature Protection Second Over-Temperature Latch-Off Debounce
Test Condition
Min.
65
Typ.
70
Max.
75 1.5
Unit
% V V ns ns
VDD = 15V, IO = 50mA VDD = 12V, IO = 50mA GATE = 1nF GATE = 1nF VDD = 20V 15.00 90 8 230 30 16.75 99 3.7 0.92 VFB = VFB-N VFB = VFB-G 15 40 0.65 50 1.00 17 51 0.70 100
18.50 108
V A V
Over-Temperature Protection (OTP) Section
1.08 19 62 0.75 150
V ms V s
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FAN6861 -- Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management
Typical Performance Characteristics
VDD-ON vs Temperature ()
18 17.8 17.6 9.6 17.4 17.2 17 16.8 16.6 -40 -30 -15 0 25 50 75 85 100 125 9 10
VDD-OFF vs Temperature ()
9.8
VDD-OFF (V)
VDD-ON (V)
9.4
9.2
8.8 -40 -30 -15 0 25 50 75 85 100 125
Temperature ()
Temperature ()
Figure 5. Turn-On Threshold Voltage (VDD-ON) vs. Temperature
Figure 6. Turn-Off Threshold Voltage (VDD-OFF) vs. Temperature
IDD-OP vs Temperature ()
3.2 3.15 3.1
FOSC vs Temperature ()
66 65.5 65 64.5
IDD-OP (mA)
3 2.95 2.9 2.85 2.8 -40 -30 -15 0 25 50 75 85 100 125
FOSC (kHz)
3.05
64 63.5 63 62.5 62 61.5 61 -40 -30 -15 0 25 50 75 85 100 125
Temperature ()
Temperature ()
Figure 7. Operating Current (IDD-OP) vs. Temperature
Figure 8. Normal PWM Frequency (fOSC) vs. Temperature
VOCP vs Temperature ()
0.535 0.525 0.515
70
DCYMAX vs Temperature ()
69.9
0.495 0.485 0.475 0.465 0.455 -40 -30 -15 0 25 50 75 85 100 125
DCYMAX (%)
0.505
69.8
VOCP (V)
69.7
69.6
69.5
69.4 -40 -30 -15 0 25 50 75 85 100 125
Temperature ()
Temperature ()
Figure 9. OCP Trigger Level (VOCP) vs. Temperature
Figure 10. Maximum Duty Cycle (DCYMAX) vs. Temperature
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FAN6861 -- Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management
Typical Performance Characteristics
VFB-N vs Temperature ()
2.92
VFB-G vs Temperature ()
2.3
2.91
2.25
2.9
2.2
VFB-N (V)
VFB-G (V)
2.89
2.15
2.88
2.1
2.87
2.05
2.86 -40 -30 -15 0 25 50 75 85 100 125
2 -40 -30 -15 0 25 50 75 85 100 125
Temperature ()
Temperature ()
Figure 11. FB Threshold Voltage For Frequency Reduction (VFB-N) vs. Temperature
Figure 12. FB Voltage at fOSC-G (VFB-N) vs. Temperature
VZDC vs Temperature ()
2 1.1
VOTP1 vs Temperature ()
1.95
1.05
1.9
1.85
VOTP1 (V)
VZDC (V)
1
0.95
1.8 0.9
1.75
1.7 -40 -30 -15 0 25 50 75 85 100 125
0.85 -40 -30 -15 0 25 50 75 85 100 125
Temperature ()
Temperature ()
Figure 13. FB Threshold Voltage for Zero Duty (VFB-ZDC) vs. Temperature
Figure 14. Threshold Voltage for Over-Temperature Protection (VOTP1) vs. Temperature
VOTP2 vs Temperature ()
0.72 104 102 0.715 100 98
IRT vs Temperature ()
0.71
VOTP2 (V)
IRT (A)
96 94 92 90 88 86
0.705
0.7
0.695
0.69 -40 -30 -15 0 25 50 75 85 100 125
84 -40 -30 -15 0 25 50 75 85 100 125
Temperature ()
Temperature ()
Figure 15. Second Threshold Voltage for OverTemperature Protection (VOPT2) vs. Temperature
(c) 2009 Fairchild Semiconductor Corporation FAN6861 * Rev. 1.0.1
Figure 16. Output Current of RT Pin (IRT) vs. Temperature
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FAN6861 -- Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management
Operation Description
Startup Operation
Figure 17 shows the typical startup circuit and transformer auxiliary winding for FAN6861 application. Before FAN6861 begins switching operation, it consumes only startup current (typically 8A) and the current supplied through the startup resistor charges the VDD capacitor (CDD). When VDD reaches turn-on voltage of 17.5V (VDD-ON), FAN6861 begins switching and the current consumed increases to 3mA. Then, the power required is supplied from the transformer auxiliary winding. The large hysteresis of VDD (8V) provides more holdup time, which allows using small capacitor for VDD. The startup resistor is typically connected to AC line for a fast reset of latch protection. Figure 18. PWM Frequency
Figure 17. Startup Circuit Figure 19. Burst Mode Operation
Green-Mode Operation
The FAN6861 uses feedback voltage (VFB) as an indicator of the output load and modulates the PWM frequency, as shown in Figure 18, such that the switching frequency decreases as load decreases. In heavy load conditions, the switching frequency is 65KHz. Once VFB decreases below VFB-N (2.85V), the PWM frequency starts to linearly decrease from 65KHz to 22kHz to reduce the switching losses. As VFB decreases below VFB-G (2.2V), the switching frequency 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. As VFB decreases below VFB-ZDC (1.9V), FAN6861 enters into burst-mode operation. When VFB drops below VFB-ZDC, FAN6861 stops switching and the output voltage starts to drop, which causes the feedback voltage to rise. Once VFB rises above VFB-ZDC, switching resumes. Burst mode alternately enables and disables switching, thereby reducing switching loss in standby mode, as shown in Figure 19.
Frequency Hopping
EMI reduction is accomplished by frequency hopping, which spreads the energy over a wider frequency range than the bandwidth measured by the EMI test equipment. An internal frequency hopping circuit changes the switching frequency between 60.8kHz and 69.2kHz with a period of 4.4ms, as shown in Figure 20.
Figure 20. Frequency Hopping
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FAN6861 -- Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management
Protections
Self-protective functions include VDD Over-Voltage Protection (OVP), Open-Loop/Overload Protection (OLP), Over-Current Protection (OCP), OverTemperature Protection (OTP). Among them, OLP, OCP, and SCP are auto-restart mode protections; while OVP and OTP are latch-mode protections. Auto-Restart Mode Protection: Once a fault condition is detected, switching is terminated and the MOSFET remains off. This causes VDD to fall because no more power is delivered from auxiliary winding. When VDD falls to VDD-OFF (9.5V), the protection is reset and the operating current reduces to startup current, which causes VDD to rise. FAN6861 resumes normal operation when VDD reaches VDD-ON (17.5V). In this manner, the auto-restart can alternately enable and disable the switching of the MOSFET until the fault condition is eliminated (see Figure 21). Latch-Mode Protection: Once this protection is triggered, switching is terminated and the MOSFET remains off. The latch is reset only when VDD is discharged below 4V by unplugging AC power line.
Vds
Power On Protection Triggers Fault Removed
acceleration mode. Therefore, the protection circuit should be triggered after a specified time to determine whether it is a transient situation or an abnormal situation.
Figure 22. Two-Level OCP Operation
Open-Loop / Over-Load Protection (OLP)
VDD
17.5V
When the upper branch of the voltage divider for the shunt regulator (KA431 shown) is broken, as shown in Figure 23, there is no current flowing through the optocoupler transistor, which pulls up the feedback voltage to 5.2V. When the feedback voltage is above 4.6V longer than 780ms, OLP is triggered. This protection is also triggered when the SMPS output drops below the nominal value longer than 780ms due to the overload condition.
9.5V
Operating Current
3mA 8uA Normal Operation Fault Situation Normal Operation
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 is for the over-current protection, which shuts down the MOSFET gate when the sensing voltage of MOSFET drain current is above the threshold longer than the shutdown delay time (780ms). This two-level OCP protection is designed for applications with peak load characteristics, such as printers and scanners. These applications have motor load and inherently impose over-load condition on the power supply during
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VFB
5.2V VFB-OLP (4.6V)
OLP Shutdown Delay Time
OLP Triggers
Figure 23. OLP Operation
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FAN6861 -- Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management
VDD Over-Voltage Protection (OVP)
VDD over-voltage protection prevents IC damage caused by over voltage on the VDD pin. The OVP is triggered when VDD voltage reaches 25V. It has a debounce time (typically 250s) to prevent false trigger by switching noise.
Leading-Edge Blanking (LEB)
Each time the power MOSFET is switched on, a turn-on spike occurs across the sense-resistor caused by primary-side capacitance and secondary-side rectifier reverse recovery. To avoid premature termination of the switching pulse, a leading-edge blanking time is built in. During this blanking period (360ns), the PWM comparator is disabled and cannot switch off the gate driver. Thus, RC filter with a small RC time constant is enough for current sensing.
Over-Temperature Protection (OTP)
The OTP circuit is composed of current source and voltage comparators. Typically NTC thermistor is connected between the RT pin and the GND pin. Once the voltage of this pin drops below a threshold of 0.7V, PWM output is disabled. Another comparator with 1V threshold is used to introduce hysteresis of OTP.
Constant Output Power Limit
FAN6861 has saw-limiter for pulse-by-pulse current limit, which guarantees almost constant power limit over different line voltages of universal input range. The conventional pulse-by-pulse current limiting scheme has a constant threshold for current limit comparator, which results in higher power limit for high line voltage. FAN6861 has a sawtooth current limit threshold that increases progressively within a switching cycle, which provides lower current limit for high line and makes the actual power limit level almost constant over different line voltages of universal input range, as shown in Figure 24.
Figure 25. Current Sense R-C Filter
Soft-Start
The FAN6861 has an internal soft-start circuit that increases pulse-by-pulse current-limit comparator 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. The voltage on the output capacitors is progressively increased with the intention of smoothly establishing the required output voltage. It also helps to prevent transformer saturation and reduce the stress on the secondary diode during startup.
Figure 24. Sawtooth Current Limiter
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FAN6861 -- Highly Integrated Green-Mode PWM Controller
Typical Application Circuit (Flyback Converter for Printer Application)
Application SMPS for Printer Fairchild Devices FAN6861 Input Voltage Range 90~264VAC Output 32V/0.6254A Nominal (20W) 32V/1.56A Peak (50W)
Figure 26.
Schematic of Application Circuit
Transformer
Core: EF-25/13/11 Primary-Side Inductance: 500H
Figure 27.
Transformer Structure
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FAN6861 -- Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management
Physical Dimensions
Figure 28. 6-Pin SSOT-6 Package
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's online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/.
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FAN6861 -- Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management
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