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PDF FAN400A Data sheet ( Hoja de datos )
| Número de pieza | FAN400A | |
| Descripción | Low-Power Green-Mode PWM Flyback Power Controller | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de FAN400A (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
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www.DataSheet4U.com
September 2008
FAN400A — Low-Power Green-Mode PWM Flyback Power
Controller without Secondary Feedback
Features
Linearly Decreasing PWM Frequency
Green Mode Under Light-Load and Zero-Load
Conditions
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
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
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
Replacement for Linear Transformers and RCC SMPS
PC 5V Standby Power
Description
This highly integrated PWM controller provides several
features to enhance the performance of low-power
flyback converters. To minimize standby power
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.
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.
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.
Related Resources
AN-400A Low-Power Green-Mode PWM Flyback
Power Controller without Secondary Feedback
Ordering Information
Part Number Operating Temperature Range Package
Eco Status Packing Method
FAN400ATY
FAN400ANY
-40°C to +105°C
-40°C to +105°C
SSOT-6
DIP-8
Green
Green
Tape & Reel
Tube
For Fairchild’s definition of “green” please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2008 Fairchild Semiconductor Corporation
FAN400A Rev. 1.0.1
www.fairchildsemi.com
1 page  
Electrical Characteristics
www.DataSheet4U.com
Unless otherwise noted, VDD=15V and TA=25°C.
Symbol
Parameter
Conditions
VDD Section
VDD-OP Continuously Operation Voltage
VDD-ON Turn-on Threshold Voltage
VDD-OFF Turn-off Threshold Voltage
IDD-ST Startup Current
IDD-OP Operating Supply Current
VDD-G OFF
VDD Low-threshold Voltage to Exit
Green-off Mode
Feedback Input Section
With Secondary
Feedback
Without Secondary
Feedback
VDD=VDD-ON – 0.1V
CL=1nF
AV
ZFB
VFB-OPEN
Input-Voltage to Current-Sense Attenuation
Input Impedance
Open-Loop Voltage
VDD-FB VDD Feedback Threshold Voltage
Current-Sense Section
IFB=0.1mA to 0.2mA
FB is Open
IFB=0.4mA
tPD Propagation Delay
VSTHVA Current Limit Valley Threshold Voltage
VSTHFL Current Limit Flat Threshold Voltage
tLEB Leading-Edge Blanking Time
VDD=18V
VDD=15V
VDD=10V
VDD=18V
VDD=15V
VDD=10V
Min.
16
7.5
4.5
20.7
18.4
250
Typ. Max.
20
22.7
17 18
8.0 8.5
8 20
3.6 4.6
VDD-OFF+1.2
2/5
2.4
22.7 24.7
20.4 22.4
100 150
0.81
0.73
0.58
1.10
1.01
0.81
310 370
Units
V
V
V
V
μA
mA
V
V/V
kΩ
V
V
V
ns
V
V
V
V
V
V
ns
© 2008 Fairchild Semiconductor Corporation
FAN400A Rev. 1.0.1
Figure 5.
Saw Limit
5
www.fairchildsemi.com
5 Page 
Applications Information
www.DataSheet4U.com
Figure 16. Reference Circuit (without Secondary-Side Feedback)
BOM
Reference
BD1
CX1 (Option)
CY1 (Option)
C1
C2
C3
C4
C7 (Option)
C8
C9
D1
D2
D4
D5 (Option)
Component
BD DI106 1A/600V
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
EC 10μF/50V
CC 1nF/100V 1206
EC 470μF/10V 105°C
EC 220μF/10V 105°C
Diode FRI07
Diode FR102
Diode SB360
ZD 6.8V/0.5W
Reference
F1
L1
L2
Q1
R1,R2
R3,R4
R5
R6
R7
R8
R10 (Option)
T1
U4
Component
R 1Ω/0.5W
Inductor 20mH 6*8mm
Inductor 10μH 6mm
MOSFET 1A/600V
R 750kΩ/1206
R 47kΩ/1206
R 47Ω/1206
R 4.7Ω/0.5W
R 100Ω/0805
R 10Ω/1206
R 10Ω/1206
Transformer EE-16
IC FAN400A (Green PWM IC)
© 2008 Fairchild Semiconductor Corporation
FAN400A Rev. 1.0.1
11
www.fairchildsemi.com
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet FAN400A.PDF ] | |
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