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PDF FAN6863 Data sheet ( Hoja de datos )
| Número de pieza | FAN6863 | |
| Descripción | Highly Integrated Green-Mode PWM Controller | |
| Fabricantes | Fairchild Semiconductor | |
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May 2011
FAN6863
Highly Integrated Green-Mode PWM Controller
Features
Low Standby Power: Under 0.1W
Low Startup Current: 8µA
Low Operating Current at Green Mode: 600µA
Peak-Current Mode Operation with Cycle-by-Cycle
Current Limiting
PWM Frequency Continuously Decreasing with
Burst Mode at Light Loads
VDD Over-Voltage Protection (OVP)
Constant Output Power Limit (Full AC Input Range)
Internal Latch Circuit (FAN6863L) for OVP, OTP
SENSE Pin Short-Circuit Protection (SSCP)
Fixed PWM Frequency (65KHz) with Frequency
Hopping
Feedback Open-Loop Protection: 60ms Delay
GATE Output Maximum Voltage Clamp: 13.5V
Soft-Start Time: 5ms
Soft Driving for EMI Improvement
Full Range Frequency Hopping
Internal OTP Sensor with Hysteresis
GATE Driving Capability: 400mA
Applications
General-purpose switched-mode power supplies and
flyback power converters, including:
Power Adapters
Open-Frame SMPS
SMPS with Surge-Current Output, such as for
Printers, Scanners, Motor Drivers
Description
A highly integrated PWM controller, FAN6863 provides
several features to enhance the performance of flyback
converters. To minimize standby power consumption, a
proprietary Green Mode provides off-time modulation to
continuously decrease the switching frequency under
light-load conditions. Under zero-load conditions, the
power supply enters Burst Mode, which completely
shuts off PWM output. Output restarts just before the
supply voltage drops below the UVLO lower limit. Green
Mode enables power supplies to meet international
power conservation requirements.
The FAN6863 is designed for SMPS and integrates a
frequency-hopping function that helps reduce EMI
emission of a power supply with minimum line filters.
The built-in synchronized slope compensation provides
proprietary sawtooth compensation for constant output
power limit over universal AC input range. The gate
output is clamped at 13.5V to protect the external
MOSFET from over-voltage damage.
Other protection functions include SENSE pin Short-
Circuit Protection (SSCP), VDD Over-Voltage Protection
(OVP), and Over-Temperature Protection (OTP). For
OTP, an external NTC thermistor can be applied to
sense the ambient temperature. When VDD OVP or OTP
is activated, an internal latch circuit latches off the
controller. Protection types shown in Table 1.
Table 1. Protection Type
Part
Number
FAN6863
FAN6863L
FAN6863R
OVP
Latch
Latch
A/R
OLP
A/R
Latch
A/R
OTP /
OTP2
Latch
Latch
A/R
SSCP
A/R
A/R
A/R
Ordering Information
Part Number
FAN6863TY
FAN6863LTY
FAN6863RTY
Operating
Temperature Range
Package
-40 to +105°C
6-Lead, SuperSOT™-6, JEDEC M0-193,
1.6mm Wide
© 2011 Fairchild Semiconductor Corporation
FAN6863 • Rev. 1.0.1
Packing Method
Tape & Reel
www.fairchildsemi.com
1 page  
Electrical Characteristics
VDD = 15V and TA = 25°C, unless otherwise noted.
Symbol
Parameter
VDD Section
VDD-OP Continuously Operating Voltage
VDD-ON Turn-On Threshold Voltage
VDD-OFF Turn-Off Voltage
VDD-LH Threshold Voltage for Latch-Off Release
IDD-ST Startup Current
IDD-OP1
Operating Supply Current when PWM
Operation
IDD-OP2 Operating Supply Current when FB< VFB-ZDC
VDD-OVP VDD Over-Voltage Protection
tD-VDDOVP VDD OVP Debounce Time
IDD-LH Latch-Off Holding Current
Feedback Input Section
AV
ZFB
VFB-OPEN
VFB-OLP
Input-Voltage to Current-Sense Attenuation
Input Impedance
FB Pin Open Voltage
Threshold Voltage for Open-Loop Protection
tD-OLP Open-Loop Protection Delay
tD-SCP Secondary Short Circuit Protection Delay
tON-SCP Short-Circuit Protection On-Time Detection
Current Sense Section
tPD
tLEB
VSTHFL
VSTHVA
tSOFT-START
Delay to Output
Leading-Edge Blanking Time
Flat Threshold Voltage for Current Limit
Valley Threshold Voltage for Current Limit
Period During Startup Time
VSSCP
Threshold Voltage for SENSE Short-Circuit
Protection
tON-SSCP
Detect SENSE On Time for SENSE Short-
Circuit Protection
tSSCP
Debounce Time for SENSE Short-Circuit
Protection
Condition
VDD-ON – 0.16V
VDD = 20V,
VFB = 3V Gate Open
VDD = 15V,
VFB < VFB-ZDC
FAN6863L-Latch,
FAN6863R-Auto
Restart
VDD = 5V; FAN6863,
FAN6863L Only
FB > VFB-OLP,
tON < 2.5µs,
TA = -40 to +105°C
FB > VFB-OLP,
tON < 2.5µs,
TA = -40 to +105°C
FB>VFB-OLP,
TA = -40 to +105°C
Duty>55%
Duty = 0%
Startup Time
tON > 4.5µs,
FB < VFB-OLP,
TA = -40 to +105°C
tON > 4.5µs,
FB < VFB-OLP,
TA = -40 to +105°C
Min.
15
6.5
3
21.5
1/4.0
5.2
4.3
54
6
200
Typ. Max. Unit
20 V
16 17 V
7.0 7.5 V
4 5V
8 15 µA
2 mA
600 µA
22.5 23.5 V
50 µs
70 80 µA
1/3.5
17
5.4
4.6
1/3.0
5.6
4.9
V/V
kΩ
V
V
60 65 ms
7 8 ms
2.5 µs
100 250 ns
250 ns
0.6 V
0.39 V
5 ms
110 mV
4.4 µs
100 µs
Continued on the following page…
© 2011 Fairchild Semiconductor Corporation
FAN6863 • Rev. 1.0.1
5
www.fairchildsemi.com
5 Page 
Operation Description
Startup Operation
Figure 24 shows a typical startup circuit and transformer
auxiliary winding for a typical application. Before
switching operation begins, FAN6863 consumes only
startup current (typically 8µA) and the current supplied
through the startup resistor charges the VDD capacitor
(CDD). When VDD reaches turn-on voltage of 16V (VDD-
ON), switching begins and the current consumed
increases to 2mA. Then power is supplied from the
transformer auxiliary winding. The large hysteresis of
VDD (7V) provides more holdup time, which allows using
a small capacitor for VDD. The startup resistor is typically
connected to AC line for a fast reset of latch protection.
Figure 25. PWM Frequency
Figure 24. Startup Circuit
Green-Mode Operation
The FAN6863 uses feedback voltage (VFB) as an
indicator of the output load and modulates the PWM
frequency, as shown in Figure 25, such that the
switching frequency decreases as load decreases. In
heavy-load conditions, the switching frequency is
65kHz. Once VFB decreases below VFB-N (2.5V), the
PWM frequency starts to linearly decrease from 65kHz
to 22.5kHz to reduce the switching losses. As VFB
decreases below VFB-G (2.2V), the switching frequency
is fixed at 22.5kHz and FAN6863 enters “deep” Green
Mode, where the operating current decreases to 600µA
(maximum), further reducing the standby power
consumption. As VFB decreases below VFB-ZDC (1.6V),
FAN6863 enters Burst-Mode operation. When VFB drops
below VFB-ZDC, switching stops and the output voltage
starts to drop, which causes the feedback voltage to
rise. Once VFB rises above VFB-ZDC, switching resumes.
Burst Mode alternately enables and disables switching,
thereby reducing switching loss in Standby Mode, as
shown in Figure 26.
Figure 26. Burst-Mode Operation
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. An internal frequency hopping circuit
changes the switching frequency between 60.8kHz and
69.2kHz with a period of 4.4ms, as shown in Figure 27.
Figure 27. Frequency Hopping
© 2011 Fairchild Semiconductor Corporation
FAN6863 • Rev. 1.0.1
11
www.fairchildsemi.com
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet FAN6863.PDF ] | |
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