FAN400CNY [FAIRCHILD]
Low-Power, Green-Mode, PWM Flyback Power Controller without Secondary Feedback (CC); 低功耗，绿色模式PWM反激式电源控制器无需次级反馈（ CC ）
| 型号： | FAN400CNY |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | Low-Power, Green-Mode, PWM Flyback Power Controller without Secondary Feedback (CC) |
| 文件： | 总14页 (文件大小：538K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
September 2008
FAN400C — Low-Power, Green-Mode, PWM Flyback Power
Controller without Secondary Feedback (CC)
Features
Description
This highly integrated PWM controller provides several
features to enhance the performance of low-power
flyback converters. To minimize standby power
Linearly Decreasing PWM Frequency
Green Mode Under Light-Load and Zero-Load
Conditions
consumption,
a
proprietary green-mode function
provides off-time modulation to linearly decrease the
switching frequency under light-load and zero-load
conditions. This green mode enables the power supply
to meet international power conservation requirements.
Another advantage of the FAN400C is that the typical
startup current is only 8μA, while the typical operating
current can be as low as 3.6mA. A large startup
resistance can be used to achieve higher power
conversion efficiency.
Constant Current (CC) without Secondary-Feedback
Circuitry
Low Startup Current: 8μA
Low Operating Current: 3.6mA
Leading-Edge Blanking
Constant Power Limit
Universal AC Input Range
FAN400C integrates
a frequency-hopping function
Synchronized Slope Compensation
140°C OTP Sensor with Hysteresis
VDD Over-Voltage Protection (Auto Restart)
Cycle-by-Cycle Current Limiting
Under-Voltage Lockout (UVLO)
Fixed PWM Frequency with Hopping
Gate Output Maximum Voltage Clamped at 17V
Small SSOT-6 Package
internally to reduce EMI emissions with minimum line
filters. Built-in synchronized slope compensation
maintains the stability of peak current-mode control.
Proprietary internal compensation ensures constant
output power limiting over a universal range of AC input
voltages, from 90VAC to 264VAC
.
The FAN400C provides many protection functions.
Pulse-by-pulse current limiting ensures constant output
current, even if a short circuit occurs. The internal
protection circuit disables PWM output if VDD exceeds
24.5V. The gate output is clamped at 17V to protect the
power MOS from over-voltage damage. The built-in
over-temperature protection (OTP) function shuts down
the controller at 140°C with a 30°C hysteresis.
Applications
General-purpose, switching-mode, power supplies and
flyback power converters, such as:
The FAN400C is designed to provide a low-cost total
solution for flyback converters. It is available in a small-
footprint, 6-pin, SSOT-6 package.
Battery Chargers for Cellular Phones, Cordless
Phones, PDAs, Digital Cameras, Power Tools
Power Adapters for Ink Jet Printers, Video Game
Consoles, Portable Audio Players
Related Resources
Open-Frame SMPS for TV/DVD Standby and
Auxiliary Supplies, Home Appliances, Consumer
Electronics
AN-6072 — Low-Power, Green-Mode, PWM Flyback
Power Controller without Secondary Feedback
Replacement for Linear Transformers and RCC SMPS
PC 5V Standby Power
Ordering Information
Part Number Operating Temperature Range
Package
Packing Method
Eco Status
Green
FAN400CTY
FAN400CNY
SSOT-6
DIP-8
Tape & Reel
Tube
-40°C to +105°C
-40°C to +105°C
Green
For Fairchild’s definition of “green” please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2008 Fairchild Semiconductor Corporation
FAN400C • Rev. 1.0.1
www.fairchildsemi.com
Application Diagram
Figure 1.
Typical Application
Internal Block Diagram
Figure 2.
Functional Block Diagram
© 2008 Fairchild Semiconductor Corporation
FAN400C • Rev. 1.0.1
www.fairchildsemi.com
2
Marking Information
XXX: AAU=FAN400C
TT : Die run code
. . . : Year code
- - - : Week code
1’st line
Z: Assembly plant code
X: Year code
Y: Week code
TT: Die run code
3’rd line
T: N=DIP
P: Z=Lead free + RoHS compatible
Y=Green package
M: Manufacture flow code
Figure 3.
Top Mark
Pin Configurations
GND
GATE
VDD
GND
FB
GATE
VDD
NC
NC
NC
NC
SENSE
SENSE
Figure 4.
SSOT-6 Pin Configuration
Figure 5.
DIP-8 Pin Configuration
Pin Definitions
DIP
Pin #
SSOT
Pin #
Name
Description
1
2
3
6
5
GATE
VDD
NC
The totem-pole output driver to drive the power MOSFET
Power supply
No connection
Current-sense detects the voltage across a sensed resistor. To provide over-
current protection, PWM output is disabled if the voltage exceeds an internal
threshold. This pin also provides current information for current-mode control.
4
4
SENSE
5
6
NC
NC
No connection
No connection
3
2
1
The FB pin provides feedback information to the internal PWM comparator. This
feedback is used to control the duty cycle.
7
8
FB
GND
Ground
© 2008 Fairchild Semiconductor Corporation
FAN400C • Rev. 1.0.1
www.fairchildsemi.com
3
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.
Symbol
VDD
Parameter
Min.
Max.
30
Unit
V
DC Supply Voltage(1,2)
Input Voltage to FB Pin
VFB
-0.3
-0.3
7.0
V
VSENSE
TJ
Input Voltage to Sense Pin
7.0
V
Operating Junction Temperature
+150
263.3
135.7
+150
+260
°C
SOT
DIP
°C/W
°C/W
°C
Thermal Resistance
(Junction-to-Air)
ΘJA
TSTG
TL
Storage Temperature Range
-55
Lead Temperature (Wave Soldering or IR, 10 Seconds)
Human Body Model
JEDEC: JESD22-A114
Electrostatic Discharge Capability
Machine Model,
°C
4
kV
V
ESD
200
JEDEC: JESD22-A115
Notes:
1. All voltage values, except differential voltages, are given with respect to GND pin.
2. Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device.
© 2008 Fairchild Semiconductor Corporation
FAN400C • Rev. 1.0.1
www.fairchildsemi.com
4
Electrical Characteristics
Unless otherwise noted, VDD=15V and TA=25°C.
Symbol
Parameter
Conditions
Min.
Typ.
Max. Units
VDD Section
VDD-OP Continuously Operation Voltage
VDD-ON Turn-On Threshold Voltage
VDD-OFF Turn-Off Threshold Voltage
23.5
18
V
V
16
17
8.0
8
7.5
8.5
20
V
IDD-ST
IDD-OP
Startup Current
VDD=VDD-ON – 0.1V
CL=1nF
μA
mA
Operating Supply Current
3.6
4.6
VDD Low-threshold Voltage to Exit Green-off
Mode
VDD-G OFF
VDD-OVP
V
V
V
DD-OFF+1.2
VDD Over-Voltage Protection
23.5
70
24.5
25.5
200
VDD Over-Voltage Protection Debounce
Time
tD-VDDOVP
μs
135
Feedback Input Section
AV
Input-Voltage to Current-Sense Attenuation
Input Impedance
1.5/5
4.5
2.0/5
4.6
2.5/5
150
V/V
kΩ
V
ZFB
IFB=0.1mA to 0.2mA
VFB-OPEN Open-Loop Voltage
Current-Sense Section
tPD
Propagation Delay
100
0.81
0.73
0.58
1.10
1.01
0.81
310
ns
V
VDD=18V
VDD=15V
VDD=10V
VDD=18V
VDD=15V
VDD=10V
VSTHVA Current Limit Valley Threshold Voltage
VSTHFL Current Limit Flat Threshold Voltage
V
V
V
V
V
tLEB
Leading-Edge Blanking Time
250
370
ns
Figure 6.
Saw Limit
© 2008 Fairchild Semiconductor Corporation
FAN400C • Rev. 1.0.1
www.fairchildsemi.com
5
Electrical Characteristics (Continued)
Unless otherwise noted, VDD=15V and TA=25°C.
Symbol
Parameter
Conditions
Min.
Typ.
Max. Units
Oscillator Section
Center Frequency
Hopping Range
60
65
±4.6
4
70
fOSC
Frequency
kHz
±5.2
±4.0
tHOP
fOSC-G
VFB-N
VFB-G
VFB-Z
SG
Hopping Period
ms
Green Mode Frequency
14.5
2.3
17.0
2.6
19.5
2.9
KHz
Green Mode Entry FB Voltage
Green Mode Ending FB Voltage
Zero Duty Cycle FB Voltage
Green Mode Modulation Slope
Frequency Variation vs. VDD Deviation
V
V
VFB-N -0.75
1.45
70
V
40
100
2
Hz/mV
%
fDV
VDD=10 to 22V
TA=-20 to 85°C
Frequency Variation vs. Temperature
Deviation
fDT
1.5
73
5.0
%
Output Section
DCYMAX Maximum Duty Cycle
VGATE-L GATE Low Voltage
VGATE-H GATE High Voltage
68
78
%
V
IO=10mA
IO=-10mA
CL=1nF
1.5
8
V
tr
tf
GATE Rising Time
GATE Falling Time
150
70
200
90
250
110
ns
ns
CL=1nF
VGATE-
CLAMP
GATE Output Clamping Voltage
VDD=20V
16
17
18
V
Over-Temperature Protection (OTP)
TOTP
Protection Junction Temperature
+140
+110
°C
°C
TOTP-
RESTART
Restart Junction Temperature
© 2008 Fairchild Semiconductor Corporation
FAN400C • Rev. 1.0.1
www.fairchildsemi.com
6
Typical Performance Characteristics
17.4
17.2
17
8.6
8.4
8.2
8
16.8
16.6
16.4
7.8
7.6
-40 -30 -20 -10
0
10 20 30 40 50 60 70 80 90 100
-40 -30 -20 -10
0
10 20
30 40 50 60 70
80 90 100
Temperature (℃ )
Temperature (℃ )
Figure 7.
Turn-on Threshold Voltage (VDD-ON
)
Figure 8.
Turn-off Threshold Voltage (VDD-OFF
vs. Temperature
)
vs. Temperature
12
11
10
9
3.4
3.2
3
2.8
2.6
2.4
2.2
8
7
6
5
4
-40 -30 -20 -10
0
10 20 30 40
50 60
70 80 90 100
-40 -30 -20 -10
0
10 20
30 40 50 60 70
80 90 100
Temperature (℃ )
Temperature (℃ )
Figure 9.
Startup Current (IDD-ST) vs.
Temperature
Figure 10. Operating Supply Current (IDD-OP
)
vs. Temperature
68
67
66
65
64
63
75
74
73
72
71
70
62
-40 -30 -20 -10
0
10 20 30 40
50 60
70 80 90 100
-40 -30 -20 -10
0
10 20 30 40
50 60
70 80 90 100
Temperature (℃ )
Temperature (℃ )
Figure 11. Center Frequency (fOSC
)
Figure 12. Maximum Duty Cycle (DCYMAX
)
vs. Temperature
vs. Temperature
© 2008 Fairchild Semiconductor Corporation
FAN400C • Rev. 1.0.1
www.fairchildsemi.com
7
Typical Performance Characteristics
3
2.8
2.6
2.4
2.2
2
2.2
2
1.8
1.6
1.4
1.2
-40 -30 -20 -10
0
10 20
30 40 50 60 70
80 90 100
-40 -30 -20 -10
0
10 20
30 40 50 60 70
80 90 100
Temperature (℃ )
Temperature (℃ )
Figure 13. Green Mode Entry FB Voltage
(VFB-N) vs. Temperature
Figure 14. Green Mode Ending FB Voltage
(VFB-G) vs. Temperature
360
3.4
3.2
3
340
320
300
280
260
2.8
2.6
2.4
2.2
12
13
14
15
16
17
18
19
20
21
22
23
24
-40 -30 -20 -10
0
10 20 30 40 50 60 70 80 90 100
VDD (V)
Temperature (℃ )
Figure 15. Leading-Edge Blanking Time (tLEB
)
Figure 16. Operating Supply Current
vs. VDD Voltage
vs. Temperature
© 2008 Fairchild Semiconductor Corporation
FAN400C • Rev. 1.0.1
www.fairchildsemi.com
8
Operation Description
FAN400C devices integrate many useful functions for
low-power switch-mode power supplies. The following
descriptions highlight the key features of the FAN400C.
Oscillator Operation
The oscillation frequency is fixed at 65KHz.
Leading-Edge Blanking (LEB)
Startup Current
Each time the power MOSFET is switched on, a turn-on
spike occurs at the sense-resistor. To avoid premature
termination of the switching pulse, a 310ns leading-
edge blanking time is built in. Conventional RC filtering
is not necessary. During this blanking period, the
current-limit comparator is disabled and cannot switch
off the gate drive.
The required startup current is only 8mA, which allows a
high-resistance, low-wattage startup resistor to supply
the controller’s startup power. A 1.5MΩ/0.25W startup
resistor can be used over a wide input range (100V-
240VAC) with very little power loss.
Operating Current
The operating current is normally 3.6mA, which results
in higher efficiency and reduces the required VDD hold-
up capacitance. A 10μF/25V VDD hold-up capacitor can
be used over a wide input range (100V-240VAC) with
very little power loss.
Constant Output Power Limit
When the SENSE voltage across the sense resistor RS
reaches the threshold voltage (around 1.0V), the output
GATE drive is turned off following a small propagation
delay, tPD
additional current proportional to
.
This propagation delay introduces an
PD•VIN/LP. The
t
Green-Mode Operation
propagation delay is nearly constant regardless of the
input line voltage VIN. Higher input line voltages result in
larger additional currents. Under high input-line
voltages, the output power limit is higher than under low
input-line voltages. Over a wide range of AC input
voltages, the variation can be significant. To
compensate for this, the threshold voltage is adjusted
by adding a positive ramp (Vlimit_ramp). This ramp signal
can vary from 0.73V to 1.01V and flattens out at 1.01V.
A smaller threshold voltage forces the output GATE
drive to terminate earlier, reducing total PWM turn-on
time and making the output power equal to that of the
low-line input. This proprietary internal compensation
feature ensures a constant output power limit over a
wide range of AC input voltages (90VAC to 264VAC).
The proprietary green-mode function provides off-time
modulation to linearly decrease the switching frequency
under light-load and zero-load conditions. The on-time
is limited to provide better protection against brownouts
and other abnormal conditions. Power supplies using
the FAN400C can meet international restrictions
regarding standby power-consumption.
Current (CC) without Feedback
The FAN400C can provide over-current protection
without requiring secondary-side feedback signals. For
improved CV and CC accuracy, the transformer leakage
inductance should be reduced as much as possible.
Over-Temperature Protection (OTP)
Under-Voltage Lockout (UVLO)
The FAN400C has a built-in temperature-sensing circuit
to shut down PWM output once the junction
temperature exceeds 140°C. While PWM output is shut
down, the VDD voltage gradually drops to the UVLO
voltage. Some of the internal circuits are shut down and
VDD gradually starts increasing again. When VDD
reaches 17V, all the internal circuits, including the
temperature-sensing circuit, operate normally. If the
junction temperature is still higher than 140°C, the
PWM controller shuts down immediately. This situation
continues until the temperature drops below 110°C. The
PWM output is then turned back on. The temperature
hysteresis window for the OTP circuit is 30°C.
The turn-on/turn-off thresholds are fixed internally at
17V and 8V. To enable the FAN400C during startup,
the hold-up capacitor must first be charged to 17V
through the startup resistor. The hold-up capacitor
continues to supply VDD before energy can be delivered
from the auxiliary winding of the main transformer. VDD
must not drop below 8V during this startup process.
This UVLO hysteresis window ensures that the hold-up
capacitor can adequately supply VDD during startup.
Gate Output
The BiCMOS output stage is a fast totem-pole gate
driver. Cross-conduction is avoided to minimize heat
dissipation, increase efficiency, and enhance reliability.
The output driver is clamped by an internal 17V Zener
diode to protect the power MOSFET transistors against
any harmful over-voltage gate signals.
VDD Over-Voltage Clamping
VDD over-voltage clamping prevents damage from over-
voltage conditions. When VDD exceeds 24.5V, PWM
output is shut down. Over-voltage conditions may be
caused by an open photo-coupler loop or a short circuit
in the output.
© 2008 Fairchild Semiconductor Corporation
FAN400C • Rev. 1.0.1
www.fairchildsemi.com
9
Operation Description (Continued)
Slope Compensation
Noise Immunity
The sensed voltage across the current-sense resistor is
used for current-mode control and pulse-by-pulse
current limiting. The built-in slope compensation
improves power supply stability. Furthermore, it
prevents sub-harmonic oscillations that normally would
Noise from the current-sense or the control signal may
cause significant pulse-width jitter, particularly in
continuous-conduction mode. Slope compensation
helps alleviate this problem. Good placement and
layout practices should be followed. Avoid long PCB
traces and component leads. Compensation and filter
components should be located near the FAN400C.
Increasing the power-MOS gate resistance is advised.
occur because of peak-current mode control.
A
positively sloped, synchronized ramp is activated with
every switching cycle. The slope of the ramp is:
0.33 × Duty
(1)
Duty (max.)
© 2008 Fairchild Semiconductor Corporation
FAN400C • Rev. 1.0.1
www.fairchildsemi.com
10
Applications Information
Figure 17. Reference Circuit
Reference
BOM
Reference
BD1
Component
Component
Inductor 10μH 6mm
MOSFET 1A/600V
BD DI106 1A/600V
YC 2.2nF/250V (Y1)
EC 4.7μF/400V 105°C
EC 4.7μF/400V 105°C
CC 1nF/1kV
L2
CY1 (Option)
Q1
C1
R1,R2
R3,R4
R5
R 750kΩ/1206
R 47kΩ/1206
R 47Ω/1206
C2
C3
C4
EC 10μF/50V
R6
R 4.7Ω/0.5W
C6
CC 4.7nF/0805
R7
R 100Ω/0805
R 10Ω/1206
C7 (Option)
CC 1nF/100V 1206
EC 470μF/10V 105°C
EC 470μF/10V 105°C
CC 2.2nF/0805
R8
C8
R10
R11
R12
R13
R14
T1
R 10Ω/1206
C9
R 100Ω/ 1/8W
R 33kΩ/0805
R 33kΩ/ 1/8W
R 4.7kΩ/0805
Transformer EE-16
IC FAN400C (Green PWM IC)
IC PC817
C10
D1
Diode FRI07
D2
Diode FR102
D4
Diode SB360
D5 (Option)
ZD 6.8V/0.5W
U1
F1
L1
R 1Ω/0.5W
U2
Inductor 20mH 6*8mm
U3
IC TL431
© 2008 Fairchild Semiconductor Corporation
FAN400C • Rev. 1.0.1
www.fairchildsemi.com
11
Physical Dimensions
9.83
9.00
6.67
6.096
8.255
7.61
3.683
3.20
7.62
5.08 MAX
0.33 MIN
3.60
3.00
(0.56)
2.54
0.356
0.20
0.56
0.355
9.957
7.87
1.65
1.27
7.62
NOTES: UNLESS OTHERWISE SPECIFIED
A) THIS PACKAGE CONFORMS TO
JEDEC MS-001 VARIATION BA
B) ALL DIMENSIONS ARE IN MILLIMETERS.
C) DIMENSIONS ARE EXCLUSIVE OF BURRS,
MOLD FLASH, AND TIE BAR EXTRUSIONS.
D) DIMENSIONS AND TOLERANC
ASME Y14.5M-1994
ES PER
E) DRAWING FILENAME AND REVSION: MKT-N08FREV2.
Figure 18. 8-Pin, DIP-8 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/.
© 2008 Fairchild Semiconductor Corporation
FAN400C • Rev. 1.0.1
www.fairchildsemi.com
12
Physical Dimensions (Continued)
Figure 19. 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/.
© 2008 Fairchild Semiconductor Corporation
FAN400C • Rev. 1.0.1
www.fairchildsemi.com
13
© 2008 Fairchild Semiconductor Corporation
FAN400C • Rev. 1.0.1
www.fairchildsemi.com
14
相关型号：
FAN400CTY
Low-Power, Green-Mode, PWM Flyback Power Controller without Secondary Feedback (CC)
FAIRCHILD
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