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PDF FAN301MY Data sheet ( Hoja de datos )

Número de pieza FAN301MY
Descripción PWM Controller
Fabricantes Fairchild Semiconductor 
Logotipo Fairchild Semiconductor Logotipo



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No Preview Available ! FAN301MY Hoja de datos, Descripción, Manual

July 2010
FAN301
PWM Controller for Low Standby Power Charger
Applications
Features
ƒ Ultra-Low Standby Power Under 20mW at 264VAC
ƒ Constant-Current (CC) Control without Secondary-
Feedback Circuitry
ƒ Green Mode: PWM Frequency Linearly Decreasing
ƒ Fixed PWM Frequency at 45kHz with Frequency
Hopping to Solve EMI Problems
ƒ High-Voltage Startup
ƒ Low Operating Current: 3mA
ƒ Peak-Current-Mode Control in CV Mode
ƒ Cycle-by-Cycle Current Limiting
ƒ VDD Over-Voltage Protection (Auto-Restart)
ƒ VDD Under-Voltage Lockout (UVLO)
ƒ Gate Output Maximum Voltage Clamped at 15V
ƒ Fixed Over-Temperature Protection (Auto-Restart)
Applications
ƒ Battery chargers for cellular phones, cordless
phones, PDA, digital cameras, power tools
ƒ Replaces linear transformer and RCC SMPS
Description
This highly integrated PWM controller, FAN301,
provides features to enhance the performance of low-
power flyback converters. The proprietary topology
enables simplified circuit design for battery charger
applications. A low-cost, smaller, and lighter charger is
the result, compared to a conventional design or a
linear transformer.
To minimize standby power consumption, a proprietary
green-mode function provides off-time modulation to
linearly decrease PWM frequency under light-load
conditions. This green mode assists the power supply in
meeting power conservation requirements.
By using FAN301, a charger can be implemented with
fewer external components and minimized cost. A
typical output CV/CC characteristic envelope is shown
in Figure 1.
Vo Maximum
Typical
Minimum
Io
Figure 1. Typical Output V-I Characteristic
(without Cable)
Ordering Information
Part Number
FAN301MY
Operating
Temperature Range
-40°C to +105°C
Package
8-Lead, Small Outline Package
Packing Method
Tape & Reel
© 2008 Fairchild Semiconductor Corporation
FAN301 • Rev. 1.0.0
www.fairchildsemi.com

1 page




FAN301MY pdf
Electrical Characteristics
VDD=15V, TA=25°C, unless noted.
Symbol
Parameter
Conditions
HV Section
VHV-MIN Minimum Startup Voltage on HV Pin
IHV Supply Current Drawn from HV Pin
IHV-LC Leakage Current Drawn from HV Pin
VAC=90V; VDD=0V, Controller
Off
With Auxiliary Supply;
VHV=500V, VDD=15V,
Controller on
VDD Section
VOP
VDD-ON
Continuously Operation Voltage
Turn-On Threshold Voltage
VDD-OFF Turn-Off Threshold Voltage
IDD-ST Startup Current
IDD-OP Operating Supply Current
IDD-BURST Burst-Mode Operating Supply Current
VDD-OVP VDD Over-Voltage Protection Level
tD-VDDOVP
VDD Over-Voltage Protection
Debounce Time
VDD=VDD-ON – 0.16V
VDD=20V, f=fOSC, CL=1nF
VDD=20V, CL=1nF
Auto-Restart
f=45kHz
Oscillator Section
Center Frequency
fOSC
Frequency
Hopping Range
tFHR
fOSC-G
fOSC-CM-MIN
Frequency Hopping Period
Green-Mode Frequency
Minimum Frequency if CCM
(Continuous Current Mode)
fOSC-CCM
Minimum Frequency in CC Mode
(Constant Current Mode)
Feedback input Section
AV
FB Input to Current Comparator
Attenuation
ZFB Input Impedance
ZFB-BURST Input Impedance at Burst Mode
VFB-OPEN Output High Voltage
VFB-N Green-Mode Entry Voltage
VFB-G Green-Mode Ending Voltage
VFBL Enter Zero Duty Cycle of FB Voltage
VFBH Exit Zero Duty Cycle of FB Voltage
FB Pin Open
Min.
27
41
5.0
Typ.
1.5
0.8
16
5
450
3
200
28
100
45
±1.55
2.84
20
21.5
24.5
1/3
42
49.5
5.3
3
2.4
1.4
1.5
Max. Units
50 V
2.0 mA
3.0 μA
25 V
V
V
μA
mA
μA
29 V
μs
49
kHz
ms
kHz
kHz
kHz
V/V
k
k
V
V
V
V
V
Continued on the following page…
© 2008 Fairchild Semiconductor Corporation
FAN301 • Rev. 1.0.0
5
www.fairchildsemi.com

5 Page





FAN301MY arduino
Dbg
RF1
AC line
LLF1
RLF
CB1 CB2
VDL
+
-
Rstart
Rsn1
Rsnr
LLF2
Istartup
Csn1
Np
TX1
Dsn
Dvdd
Naux Rvs1
Cvdd
Rvs2 Cvs
HV VS
NC GATE
VDD
CS
GND
FB
FAN301
Cfb2
1N60
Rgate
Rcs
Green-Mode Operation
The proprietary green-mode function provides off-time
modulation to linearly decrease the switching
frequency, as shown in Figure 28. Under light-load and
zero-load conditions, the on-time is limited to provide
protection against brownouts and abnormal conditions.
Power supplies using FAN301 can meet international
restrictions regarding standby power-consumption.
Figure 26. HV Startup Circuit
Operating Current
The operating current has been reduced to 3mA, which
results in higher efficiency and reduces the VDD hold-up
capacitance requirement. Once FAN301 enters burst
mode, the operating current is reduced to 200μA,
allowing the power supply to meet the power
conservation requirements.
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. FAN301 has an internal frequency-hopping
circuit that changes the switching frequency between
41kHz and 49kHz with a period, as shown in Figure 27.
Figure 28. Green-Mode Frequency vs. VFB
Burst-Mode Operation
The power supply enters “burst-mode” in no-load
conditions. As shown in Figure 29, when VFB drops
below VFBL, the PWM output is shuts off and the output
voltage drops at a rate dependent on load current. This
causes the feedback voltage to rise. Once VFB exceeds
VFBH, the internal circuit starts to provide a switching
pulse. The feedback voltage then falls and the process
repeats. Burst-mode operation alternately enables and
disables switching of the MOSFET, reducing the
switching losses in standby mode.
Figure 27. Frequency Hopping
© 2007 Fairchild Semiconductor Corporation
VFBH
VFBL
Figure 29. Burst-Mode Operation
Gate Output
The FAN301 BiCMOS output stage is a fast totem-pole
gate driver. Cross conduction has been avoided to
minimize heat dissipation, increase efficiency, and
enhance reliability. The output driver is clamped by an
internal 15V Zener diode to protect the power MOSFET
transistors against undesired over-voltage gate signals.
www.fairchildsemi.com

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