FAN400ATY [ONSEMI]
无次级反馈的低功耗绿色模式 PWM 反激电源控制器;
| 型号： | FAN400ATY |
| 厂家： | 
ONSEMI |
| 描述： | 无次级反馈的低功耗绿色模式 PWM 反激电源控制器 控制器 信息通信管理 开关 光电二极管 |
| 文件： | 总16页 (文件大小：1133K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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FAN400A — Low-Power Green-Mode PWM Flyback Power
Controller without Secondary Feedback
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.
The supply voltage VDD is also used for feedback
compensation, to regulate the output voltage without
requiring a conventional TL431 and a photo-coupler.
Another advantage of the FAN400A 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 even higher power
conversion efficiency.
Constant Voltage (CV) and Constant Current (CC)
No Secondary Feedback
Low Startup Current: 8μA
Low Operating Current: 3.6mA
Leading-Edge Blanking
Constant Power Limit
Universal AC Input Range
Synchronized Slope Compensation
140°C OTP Sensor with Hysteresis
VDD Over-Voltage Clamping
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
FAN400A integrates a frequency hopping function
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 FAN400A 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
22.7V. 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:
Battery Chargers for Cellular Phones, Cordless
Phones, PDAs, Digital Cameras, Power Tools
The FAN400A is designed to provide a low-cost total
solution for flyback converters. It is available in a small-
footprint, 6-pin, SSOT-6 package.
Power Adapters for Ink Jet Printers, Video Game
Consoles, Portable Audio Players
Open-Frame SMPS for TV/DVD Standby and
Auxiliary Supplies, Home Appliances, Consumer
Electronics
Related Resources
Replacement for Linear Transformers and RCC SMPS
PC 5V Standby Power
AN-400A Low-Power Green-Mode PWM Flyback
Power Controller without Secondary Feedback
Ordering Information
Part Number Operating Temperature Range
Package
Packing Method
Eco Status
Green
FAN400ATY
FAN400ANY
SSOT-6
DIP-8
Tape & Reel
Tube
-40°C to +105°C
-40°C to +105°C
Green
© 2008 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN400A • Rev. 2, Feb-2020
Application Diagram
VIN
DO
RIN
D1
CO
VO
VDD
W AUX
Q1
GATE
CIN
SENSE
GND
RS
Figure 1.
Typical Application
Internal Block Diagram
Figure 2.
Functional Block Diagram
© 2008 Fairchild Semiconductor Corporation
FAN400A • Rev. 2, Feb-2020
www.fairchildsemi.com
2
Marking Information
XXX: AAT=FAN400A
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: Y=Green package
M: Manufacture flow code
Figure 3.
Top Mark
Pin Configuration
DIP-8
SSOT-6
GND
GATE
VDD
GND
FB
GATE
VDD
NC
NC
NC
NC
SENSE
SENSE
Figure 4.
Pin Configurations
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 senses 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. When no feedback is provided, this
pin is left open.
7
8
FB
GND
Ground
© 2008 Fairchild Semiconductor Corporation
FAN400A • Rev. 2, Feb-2020
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
VVDD
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
SSOT
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
JESD22-A114
Electrostatic Discharge Capability
Machine Model
°C
4
kV
V
ESD
200
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
FAN400A • Rev. 2, Feb-2020
www.fairchildsemi.com
4
Electrical Characteristics
Unless otherwise noted, VDD=15V and TA=25°C.
Symbol
Parameter
Conditions
Min.
Typ.
Max. Units
VDD Section
With Secondary
Feedback
20
V
V
VDD-OP Continuously Operation Voltage
Without Secondary
Feedback
22.7
VDD-ON Turn-on Threshold Voltage
VDD-OFF Turn-off Threshold Voltage
16
17
8.0
8
18
8.5
20
V
V
7.5
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
V
V
DD-OFF+1.2
Feedback Input Section
AV
Input-Voltage to Current-Sense Attenuation
Input Impedance
0.3
4.6
V/V
kΩ
V
ZFB
IFB=0.1mA to 0.2mA
VFB-OPEN Open-Loop Voltage
4.5
FB is Open
IFB=0.4mA
20.7
18.4
22.7
20.4
24.7
22.4
V
VDD-FB
VDD Feedback Threshold Voltage
V
Current-Sense Section
tPD
Propagation Delay
100
0.81
0.73
0.58
1.10
1.01
0.81
310
150
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 5.
Saw Limit
© 2008 Fairchild Semiconductor Corporation
FAN400A • Rev. 2, Feb-2020
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
±5.1
±4.1
tHOP
fOSC-G
VFB-N
Hopping Period
ms
Green Mode Frequency
14.5
2.3
17.0
2.6
19.5
2.9
KHz
V
Green Mode Entry FB Voltage
VFB-N
0.75
-
VFB-G
Green Mode Ending FB Voltage
V
VFB-Z
SG
Zero Duty Cycle FB Voltage
1.4
70
V
Hz/mV
%
Green Mode Modulation Slope
Frequency Variation vs. VDD Deviation
40
68
100
2
fDV
VDD=10 to 22V
fDT
Frequency Variation vs. Temperature Deviation TA=-20 to 85°C
1.5
73
5.0
%
Output Section
DCYMAX Maximum Duty Cycle
VGATE-L GATE Low Voltage
VGATE-H GATE High Voltage
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
FAN400A • Rev. 2, Feb-2020
www.fairchildsemi.com
6
Typical Performance Characteristics
8.6
8.4
8.2
8
17
16.8
16.6
16.4
16.2
16
7.8
7.6
-40
-25
-10
5
20
35
50
65
80
95
110
125
-40
-25
-25
-25
-10
-10
-10
5
20
35
50
65
80
95
110
125
Temperature (
)
℃
Temperature (
℃
)
Figure 6.
Turn-on Threshold Voltage (VDD-ON
)
Figure 7.
Turn-off Threshold Voltage (VDD-ON
)
vs. Temperature
vs. Temperature
9
8
7
6
5
4
4
3.8
3.6
3.4
3.2
3
-40
-25
-10
5
20
35
50
65
80
95
110
125
-40
5
20
35
50
65
80
95
110
125
Temperature (℃ )
Temperature (℃ )
Figure 8.
Startup Current (IDD-ST
vs. Temperature
)
Figure 9.
Operating Supply Current (IDD-OP
)
vs. Temperature
68
67
66
65
64
63
62
75
74
73
72
71
70
-40
-25
-10
5
20
35
50
65
80
95
110
125
-40
5
20
35
50
65
80
95
110
125
Temperature (℃ )
Temperature (℃ )
Figure 10.
Center Frequency (fOSC
)
Figure 11.
Maximum Duty Cycle (DCYMAX
)
vs. Temperature
vs. Temperature
© 2008 Fairchild Semiconductor Corporation
FAN400A • Rev. 2, Feb-2020
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
-25
-10
5
20
35
50
65
80
95
110
125
-40
-25
-10
5
20
35
50
65
80
95
110
125
Temperature (℃ )
Temperature (℃ )
Figure 12.
Green-Mode Entry FB Voltage
(VFB-N) vs. Temperature
Figure 13.
Green-Mode Ending FB Voltage
(VFB-G) vs. Temperature
300
280
260
240
220
200
5
4.5
4
3.5
3
2.5
2
12
13
14
15
16
17
18
19
20
21
22
23
24
-40
-25
-10
5
20
35
50
65
80
95
110
125
VDD (V)
Temperature (℃ )
Figure 14.
Leading-Edge Blanking Time (tLEB
)
Figure 15.
Operating Supply Current
vs. VDD Voltage
vs. Temperature
© 2008 Fairchild Semiconductor Corporation
FAN400A • Rev. 2, Feb-2020
www.fairchildsemi.com
8
Operation Description
FAN400A devices integrate many useful functions for
low-power switch-mode power supplies. The following
descriptions highlight the key features of the FAN400A.
Oscillator Operation
The oscillation frequency is fixed at 65KHz.
Startup Current
Leading-Edge Blanking (LEB)
The required startup current is only 8μA. This allows a
high-resistance, low-wattage startup resistor to supply
the controller’s startup power. A 1.5 MΩ/0.25W startup
resistor can be used over a wide input range (100V-
240VAC) with very little power loss.
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.
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 FAN400A can meet international restrictions
regarding standby power-consumption.
Constant Voltage (CV) and Constant
Current (CC) without Feedback
The FAN400A can tightly regulate the output voltage
and 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.
Under Voltage Lockout (UVLO)
The turn-on/turn-off thresholds are fixed internally at
17V and 8V. To enable the FAN400A 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.
Over-Temperature Protection (OTP)
The FAN400A 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.
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 is built in to prevent damage
from over-voltage conditions. When VDD exceeds 22.7V,
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
FAN400A • Rev. 2, Feb-2020
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
occur because of peak current mode control. A
positively sloped, synchronized ramp is activated with
every switching cycle. The slope of the ramp is:
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. The designer
should avoid long PCB traces and component leads.
Compensation and filter components should be located
near the FAN400A. Finally, increasing the power-MOS
gate resistance is advised.
0.33 × Duty
(1)
Duty(max.)
© 2008 Fairchild Semiconductor Corporation
FAN400A • Rev. 2, Feb-2020
www.fairchildsemi.com
10
Applications Information
Figure 16. Reference Circuit (without Secondary-Side Feedback)
BOM
Reference
Component
BD DI106 1A/600V
Reference
Component
BD1
F1
L1
L2
R 1Ω/0.5W
CX1 (Option)
YC 4.7nF/400V (Y1)
YC 2.2nF/250V (Y1)
EC 4.7μF/400V 105°C
EC 4.7μF/400V 105°C
CC 1nF/1kV
Inductor 20mH 6*8mm
Inductor 10μH 6mm
MOSFET 1A/600V
R 750kΩ/1206
CY1 (Option)
C1
Q1
C2
R1,R2
C3
R3,R4
R 47kΩ/1206
C4
EC 10μF/50V
R5
R 47Ω/1206
C7 (Option)
CC 1nF/100V 1206
EC 470μF/10V 105°C
EC 220μF/10V 105°C
Diode FRI07
R6
R 4.7Ω/0.5W
C8
R7
R 100Ω/0805
C9
R8
R 10Ω/1206
D1
R10 (Option)
R 10Ω/1206
D2
Diode FR102
T1
Transformer EE-16
IC FAN400A (Green PWM IC)
D4
Diode SB360
U4
D5 (Option)
ZD 6.8V/0.5W
© 2008 Fairchild Semiconductor Corporation
FAN400A • Rev. 2, Feb-2020
www.fairchildsemi.com
11
Applications Information (Continued)
Figure 17. Reference Circuit (with Secondary-Side Feedback)
BOM
Reference
Component
BD DI106 1A/600V
Reference
Component
Inductor 10μH 6mm
BD1
L2
CY1 (Option)
YC 2.2nF/250V (Y1)
EC 4.7μF/400V 105°C
EC 4.7μF/400V 105°C
CC 1nF/1kV
Q1
MOSFET 1A/600V
R 750kΩ/1206
R 47kΩ/1206
R 47Ω/1206
C1
R1,R2
R3,R4
R5
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 FAN400A (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
FAN400A • Rev. 2, Feb-2020
www.fairchildsemi.com
12
SYMM
C
L
0.95
0.95
C
3.00
2.80
A
1.00 MIN
6
4
B
3.00
2.60
2.60
1.70
1.50
C
1
3
0.50
0.30
0.95
0.70 MIN
M
0.20
A B
1.90
LAND PATTERN RECOMMENDATION
SEE DETAIL A
(0.30)
1.10 MAX
H
1.00
0.70
C
0.10
0.20
0.08
0.10
0.00
NOTES: UNLESS OTHERWISE SPECIFIED
A) THIS PACKAGE CONFORMS TO JEDEC MO-193.
VAR. AA, ISSUE E.
C
B) ALL DIMENSIONS ARE IN MILLIMETERS.
C PACKAGE LENGTH DOES NOT INCLUDE MOLD
FLASH, PROTRUSIONS OR GATE BURRS. MOLD
FLASH, PROTRUSIONS OR GATE BURRS SHALL
NOT EXCEED 0.25mm PER END. PACKAGE WIDTH
DOES NOT INCLUDE INTERLEAD FLASH OR
PROTRUSION. INTERLEAD FLASH OR
GAGE PLANE
0.25
8°
0°
PROTRUSION SHALL NOT EXCEED 0.25mm PER
SIDE. PACKAGE LENGTH AND WIDTH DIMENSIONS
ARE DETERMINED AT DATUM H.
D) DRAWING FILE NAME: MKT-MA06AREVF
0.55
0.35
SEATING PLANE
0.60 REF
DETAIL A
SCALE: 50X
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