FAN400C
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FAN400C Low-Power, Green-Mode, Flyback Power Controller without Secondary Feedback (CC)
FAN400C Low-Power, Green-Mode, Flyback Power
Controller without Secondary Feedback (CC)
Features
Linearly Decreasing Frequency Green Mode Under Light-Load Zero-Load Conditions Constant Current (CC) without Secondary-Feedback Circuitry Startup Current: Operating Current: 3.6mA Leading-Edge Blanking Constant Power Limit Universal Input Range Synchronized Slope Compensation 140°C Sensor with Hysteresis Over-Voltage Protection (Auto Restart) Cycle-by-Cycle Current Limiting Under-Voltage Lockout (UVLO) Fixed Frequency with Hopping Gate Output Maximum Voltage Clamped Small SSOT-6 Package
Description
This highly integrated controller provides several features enhance performance low-power flyback converters. minimize standby power consumption, proprietary green-mode function provides off-time modulation linearly decrease switching frequency under light-load zero-load conditions. This green mode enables power supply meet international power conservation requirements. Another advantage FAN400C that typical startup current only while typical operating current 3.6mA. large startup resistance used achieve higher power conversion efficiency. FAN400C integrates frequency-hopping function internally reduce emissions with minimum line filters. Built-in synchronized slope compensation maintains stability peak current-mode control. Proprietary internal compensation ensures constant output power limiting over universal range input voltages, from 90VAC 264VAC. FAN400C provides many protection functions. Pulse-by-pulse current limiting ensures constant output current, even short circuit occurs. internal protection circuit disables output exceeds 24.5V. gate output clamped protect power from over-voltage damage. built-in over-temperature protection (OTP) function shuts down controller 140°C with 30°C hysteresis. FAN400C designed provide low-cost total solution flyback converters. available small footprint, 6-pin, SSOT-6 8-pin packages.
Applications
General-purpose, switching-mode power supplies flyback power converters, such Battery Chargers Cellular Phones, Cordless Phones, PDAs, Digital Cameras, Power Tools Power Adapters Printers, Video Game Consoles, Portable Audio Players Open-Frame SMPS TV/DVD Standby Auxiliary Supplies, Home Appliances, Consumer Electronics Replacement Linear Transformers SMPS Standby Power
Related Resources
AN-6072 Low-Power, Green-Mode, Flyback Power Controller without Secondary Feedback
Ordering Information
Part Number
FAN400CTY FAN400CNY
Operating Temperature Range
-40°C +105°C -40°C +105°C
Package
SSOT-6 DIP-8
Status
Green Green
Packing Method
Tape Reel Tube
Fairchild's definition "green" please visit:
2008 Fairchild Semiconductor Corporation FAN400C Rev. 1.0.2
www.fairchildsemi.com
FAN400C Low-Power, Green-Mode, Flyback Power Controller without Secondary Feedback (CC)
Application Diagram
Figure
Typical Application
Internal Block Diagram
Figure
Functional Block Diagram
2008 Fairchild Semiconductor Corporation FAN400C Rev. 1.0.2
www.fairchildsemi.com
FAN400C Low-Power, Green-Mode, Flyback Power Controller without Secondary Feedback (CC)
Marking Information
XXX: AAU=FAN400C code
Year code
Week code
1'st line Assembly plant code Year code Week code code 3'rd line N=DIP Z=Lead free RoHS compatible Y=Green package Manufacture flow code Figure Mark
Configurations
Figure
GATE SENSE
SSOT-6 Configuration
GATE SENSE
Figure
DIP-8 Configuration
Definitions
SSOT
Name
GATE SENSE
Description
totem-pole output driver drive power MOSFET Power supply connection Current-sense detects voltage across sensed resistor. provide overcurrent protection, output disabled voltage exceeds internal threshold. This also provides current information current-mode control. connection connection provides feedback information internal comparator. This feedback used control duty cycle. Ground
2008 Fairchild Semiconductor Corporation FAN400C Rev. 1.0.2
www.fairchildsemi.com
FAN400C Low-Power, Green-Mode, Flyback Power Controller without Secondary Feedback (CC)
Absolute Maximum Ratings
Stresses exceeding absolute maximum ratings damage device. device function operable above recommended operating conditions stressing parts these levels recommended. addition, extended exposure stresses above recommended operating conditions affect device reliability. absolute maximum ratings stress ratings only.
Symbol
VSENSE TSTG Supply Voltage
(1,2)
Parameter
Input Voltage Input Voltage Sense Operating Junction Temperature Thermal Resistance (Junction-to-Air) Storage Temperature Range Lead Temperature (Wave Soldering Seconds) Electrostatic Discharge Capability Human Body Model JEDEC: JESD22-A114 Machine Model, JEDEC: JESD22-A115
Min.
-0.3 -0.3
Max.
+150 263.3 135.7
Unit
°C/W °C/W
+150 +260
Notes: voltage values, except differential voltages, given with respect pin. Stresses beyond those listed under "absolute maximum ratings" cause permanent damage device.
2008 Fairchild Semiconductor Corporation FAN400C Rev. 1.0.2
www.fairchildsemi.com
FAN400C Low-Power, Green-Mode, Flyback Power Controller without Secondary Feedback (CC)
Electrical Characteristics
Unless otherwise noted, VDD=15V TA=25°C.
Symbol Section
VDD-OP VDD-ON VDD-OFF IDD-ST IDD-OP VDD-G VDD-OVP tD-VDDOVP
Parameter
Continuously Operation Voltage Turn-On Threshold Voltage Turn-Off Threshold Voltage Startup Current Operating Supply Current Low-threshold Voltage Exit Green-off Mode Over-Voltage Protection Over-Voltage Protection Debounce Time Input-Voltage Current-Sense Attenuation Input Impedance Open-Loop Voltage Propagation Delay
Conditions
Min.
Typ.
Max.
23.5
Units
VDD=VDD-ON 0.1V CL=1nF
VDD-OFF+1.2
23.5
24.5
25.5
Feedback Input Section
VFB-OPEN VSTHVA IFB=0.1mA 0.2mA VDD=18V Current Limit Valley Threshold Voltage VDD=15V VDD=10V VDD=18V VSTHFL tLEB Current Limit Flat Threshold Voltage Leading-Edge Blanking Time VDD=15V VDD=10V 0.81 0.73 0.58 1.10 1.01 0.81
Current-Sense Section
Figure
Limit
2008 Fairchild Semiconductor Corporation FAN400C Rev. 1.0.2
www.fairchildsemi.com
FAN400C Low-Power, Green-Mode, Flyback Power Controller without Secondary Feedback (CC)
Electrical Characteristics (Continued)
Unless otherwise noted, VDD=15V TA=25°C.
Symbol Oscillator Section
fOSC tHOP fOSC-G VFB-N VFB-G VFB-Z Frequency Hopping Period
Parameter
Center Frequency Hopping Range
Conditions
Min.
±4.0 14.5
Typ.
±4.6 17.0 VFB-N -0.75 1.45
Max.
±5.2 19.5
Units
Green Mode Frequency Green Mode Entry Voltage Green Mode Ending Voltage Zero Duty Cycle Voltage Green Mode Modulation Slope Frequency Variation Deviation Frequency Variation Temperature Deviation Maximum Duty Cycle GATE Voltage GATE High Voltage GATE Rising Time GATE Falling Time GATE Output Clamping Voltage IO=10mA IO=-10mA CL=1nF CL=1nF VDD=20V VDD=10 TA=-20 85°C
Hz/mV
Output Section
DCYMAX VGATE-L VGATE-H VGATECLAMP
Over-Temperature Protection (OTP)
TOTP TOTPRESTART
Protection Junction Temperature Restart Junction Temperature
+140 +110
2008 Fairchild Semiconductor Corporation FAN400C Rev. 1.0.2
www.fairchildsemi.com
FAN400C Low-Power, Green-Mode, Flyback Power Controller without Secondary Feedback (CC)
Typical Performance Characteristics
17.4
17.2
DD-OFF
DD-ON
16.8
16.6
16.4
emperature
emperature
Figure
Turn-on Threshold Voltage (VDD-ON) Temperature
Figure
Turn-off Threshold Voltage (VDD-OFF) Temperature
IDD-ST
emperature
IDD-OP (mA)
emperature
Figure
Startup Current (IDD-ST) Temperature
Figure
Operating Supply Current (IDD-OP) Temperature
fOSC (KHz)
emperature
emperature
Figure
Center Frequency (fOSC) Temperature
Figure
Maximum Duty Cycle (DCYMAX) Temperature
2008 Fairchild Semiconductor Corporation FAN400C Rev. 1.0.2
www.fairchildsemi.com
FAN400C Low-Power, Green-Mode, Flyback Power Controller without Secondary Feedback (CC)
Typical Performance Characteristics
FB-N
FB-G
emperature
emperature
Figure
Green Mode Entry Voltage (VFB-N) Temperature
Figure
Green Mode Ending Voltage (VFB-G) Temperature
tLEB (ns)
IDD-OP (mA)
Temperature
Figure
Leading-Edge Blanking Time (tLEB) Temperature
Figure
Operating Supply Current Voltage
2008 Fairchild Semiconductor Corporation FAN400C Rev. 1.0.2
www.fairchildsemi.com
FAN400C Low-Power, Green-Mode, Flyback Power Controller without Secondary Feedback (CC)
Operation Description
FAN400C devices integrate many useful functions low-power switch-mode power supplies. following descriptions highlight features FAN400C.
Oscillator Operation
oscillation frequency fixed 65KHz.
Startup Current
required startup current only 8mA, which allows high-resistance, low-wattage startup resistor supply controller's startup power. 1.5M/0.25W startup resistor used over wide input range (100V240VAC) with very little power loss.
Leading-Edge Blanking (LEB)
Each time power MOSFET switched turn-on spike occurs sense-resistor. avoid premature termination switching pulse, 310ns leadingedge blanking time built Conventional filtering necessary. During this blanking period, current-limit comparator disabled cannot switch gate drive.
Operating Current
operating current normally 3.6mA, which results higher efficiency reduces required holdup capacitance. 10F/25V hold-up capacitor used over wide input range (100V-240VAC) with very little power loss.
Constant Output Power Limit
When SENSE voltage across sense resistor reaches threshold voltage (around 1.0V), output GATE drive turned following small propagation delay, tPD. This propagation delay introduces additional current proportional propagation delay nearly constant regardless input line voltage VIN. Higher input line voltages result larger additional currents. Under high input-line voltages, output power limit higher than under input-line voltages. Over wide range input voltages, variation significant. compensate this, threshold voltage adjusted adding positive ramp (Vlimit_ramp). This ramp signal vary from 0.73V 1.01V flattens 1.01V. smaller threshold voltage forces output GATE drive terminate earlier, reducing total turn-on time making output power equal that low-line input. This proprietary internal compensation feature ensures constant output power limit over wide range input voltages (90VAC 264VAC).
Green-Mode Operation
proprietary green-mode function provides off-time modulation linearly decrease switching frequency under light-load zero-load conditions. on-time limited provide better protection against brownouts other abnormal conditions. Power supplies using FAN400C meet international restrictions regarding standby power-consumption.
Current (CC) without Feedback
FAN400C provide over-current protection without requiring secondary-side feedback signals. improved accuracy, transformer leakage inductance should reduced much possible.
Over-Temperature Protection (OTP)
FAN400C built-in temperature-sensing circuit shut down output once junction temperature exceeds 140°C. While output shut down, voltage gradually drops UVLO voltage. Some internal circuits shut down gradually starts increasing again. When reaches 17V, internal circuits, including temperature-sensing circuit, operate normally. junction temperature still higher than 140°C, controller shuts down immediately. This situation continues until temperature drops below 110°C. output then turned back temperature hysteresis window circuit 30°C.
Under-Voltage Lockout (UVLO)
turn-on/turn-off thresholds fixed internally enable FAN400C during startup, hold-up capacitor must first charged through startup resistor. hold-up capacitor continues supply before energy delivered from auxiliary winding main transformer. must drop below during this startup process. This UVLO hysteresis window ensures that hold-up capacitor adequately supply during startup.
Gate Output
BiCMOS output stage fast totem-pole gate driver. Cross-conduction avoided minimize heat dissipation, increase efficiency, enhance reliability. output driver clamped internal Zener diode protect power MOSFET transistors against harmful over-voltage gate signals.
Over-Voltage Clamping
over-voltage clamping prevents damage from overvoltage conditions. When exceeds 24.5V, output shut down. Over-voltage conditions caused open photo-coupler loop short circuit output.
2008 Fairchild Semiconductor Corporation FAN400C Rev. 1.0.2
www.fairchildsemi.com
FAN400C Low-Power, Green-Mode, Flyback Power Controller without Secondary Feedback (CC)
Operation Description (Continued)
Slope Compensation
sensed voltage across current-sense resistor used current-mode control pulse-by-pulse current limiting. built-in slope compensation improves power supply stability. Furthermore, prevents sub-harmonic oscillations that normally would occur because peak-current mode control. positively sloped, synchronized ramp activated with every switching cycle. slope ramp 0.33 Duty Duty (max.)
Noise Immunity
Noise from current-sense control signal cause significant pulse-width jitter, particularly continuous-conduction mode. Slope compensation helps alleviate this problem. Good placement layout practices should followed. Avoid long traces component leads. Compensation filter components should located near FAN400C. Increasing power-MOS gate resistance advised.
2008 Fairchild Semiconductor Corporation FAN400C Rev. 1.0.2
www.fairchildsemi.com
FAN400C Low-Power, Green-Mode, Flyback Power Controller without Secondary Feedback (CC)
Applications Information
Figure
Reference Circuit
Reference
(Option) (Option) (Option)
Component
DI106 1A/600V 2.2nF/250V (Y1) 4.7F/400V 105°C 4.7F/400V 105°C 1nF/1kV 10F/50V 4.7nF/0805 1nF/100V 1206 470F/10V 105°C 470F/10V 105°C 2.2nF/0805 Diode FRI07 Diode FR102 Diode SB360 6.8V/0.5W 1/0.5W Inductor 20mH 6*8mm
Reference
R1,R2 R3,R4
Component
Inductor MOSFET 1A/600V 750k/1206 47k/1206 47/1206 4.7/0.5W 100/0805 10/1206 10/1206 100/ 1/8W 33k/0805 33k/ 1/8W 4.7k/0805 Transformer EE-16 FAN400C (Green PC817 TL431
2008 Fairchild Semiconductor Corporation FAN400C Rev. 1.0.2
www.fairchildsemi.com
FAN400C Low-Power, Green-Mode, Flyback Power Controller without Secondary Feedback (CC)
Physical Dimensions
9.83 9.00
6.67 6.096
8.255 7.61
5.08
3.683 3.20
7.62
0.33 (0.56) 2.54
3.60 3.00 0.56 0.355 1.65 1.27
7.62
0.356 0.20 9.957 7.87
NOTES: UNLESS OTHERWISE SPECIFIED THIS PACKAGE CONFORMS JEDEC MS-001 VARIATION DIMENSIONS MILLIMETERS. DIMENSIONS EXCLUSIVE BURRS, MOLD FLASH, EXTRUSIONS. DIMENSIONS TOLERANCES ASME Y14.5M-1994 DRAWING FILENAME REVSION: MKT-N08FREV2.
Figure 8-Pin, DIP-8 Package
Package drawings provided service customers considering Fairchild components. Drawings change manner without notice. Please note revision and/or date drawing contact Fairchild Semiconductor representative verify obtain most recent revision. Package specifications expand terms Fairchild's worldwide terms conditions, specifically warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor's online packaging area most recent package drawings:
2008 Fairchild Semiconductor Corporation FAN400C Rev. 1.0.2
www.fairchildsemi.com
FAN400C Low-Power, Green-Mode, Flyback Power Controller without Secondary Feedback (CC)
Physical Dimensions (Continued)
Figure 6-Pin SSOT-6 Package
Package drawings provided service customers considering Fairchild components. Drawings change manner without notice. Please note revision and/or date drawing contact Fairchild Semiconductor representative verify obtain most recent revision. Package specifications expand terms Fairchild's worldwide terms conditions, specifically warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor's online packaging area most recent package drawings:
2008 Fairchild Semiconductor Corporation FAN400C Rev. 1.0.2
www.fairchildsemi.com
www.fairchildsemi.com
FAN400C Low-Power, Green-Mode, Flyback Power Controller without Secondary Feedback (CC)
2008 Fairchild Semiconductor Corporation FAN400C Rev. 1.0.2
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