FL77944MX [ONSEMI]
Analog/PWM/Phase-cut Dimmable High Power LED Direct AC Driver;型号: | FL77944MX |
厂家: | ONSEMI |
描述: | Analog/PWM/Phase-cut Dimmable High Power LED Direct AC Driver |
文件: | 总12页 (文件大小:403K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
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July 2016
FL77944
Analog/PWM/Phase-cut Dimmable High Power LED
Direct AC Driver
Description
Features
The FL77944 is a direct AC line LED driver with a
minimal number of external RC passive components. In
normal configuration, one resistor is to adjust LED
power, and one capacitor is to provide a stable voltage
to an internal biasing shunt regulator.
.
The simplest Direct AC LED Driver with Only Two
External RC Passive Component
.
.
Wide AC Input Range: 90~305 VAC
Four Integrated High-Voltage LED Constant
Current Sinks of up to 150 mA (RMS) Capability
The FL77944 provides phase-cut dimming with wide
dimming range, smooth dimming control and good
dimmer compatibility. It achieves high efficiency with
high PF and low THD, which makes the FL77944
suitable for high-efficiency LED lighting systems. The
FL77944 has a dedicated DIM pin which can be used
with analog or digital PWM dimming. The FL77944 can
also be used with a rheostat dimmer switch which is
suitable for desktop or indoor lamps.
.
.
.
.
.
TRIAC Dimmable (Leading/Trailing Edge)
Rheostat Dimmable
Analog/Digital PWM Dimming Function
High Power Factor (above 0.98 typically)
Adjustable LED Power with an External Current
Sense Resistor
.
.
.
.
.
Low Harmonic Content (THD under 20% typically)
SOIC-16 EP Package
Operation of FL77944 admits driving higher-wattage
systems, such as street lights and down lights, by
simply parallel connecting the driver ICs.
Flexible LED Forward Voltage Configuration
Power Scalability with Multiple Driver ICs
Over-Temperature Protection (OTP)
Applications
.
General LED Driving Solution for Residential,
Commercial and Industrial Lighting
Ordering Information
Operating
Temperature Range
Packing
Part Number
Package
Method
16-Lead, Small Outline Integrated Circuit
2,500 per Reel
FL77944MX
-40 to 125°C
(SOIC) Exposed Dap 150” Narrow Body
© 2016 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FL77944 • Rev. 1.2
Typical Applications
Down-light 12W LED Driver using
1.3W high VF LEDs
2K
VIN
Bridge
LED1
VDD
Rectifier
Fuse
LED2
LED3
MODE
LED4
CVDD
0.1uF, 50V
CS GND DIM
RCS
1%
120 VAC
VF=35V@42mA LEDs(Each group’s VF
can be flexible as long as total series VF
Is 130~140V)
GND
Figure 1.
12 W at 120 VAC LED Down-Light Application
4ft tube-type 22W LED Driver using
288x0.06W LEDs
2K
0.06W 18X5
0.06W 18X4
0.06W 18X4
0.06W 18X3
VIN
Bridge
Rectifier
LED1
VDD
Fuse
LED2
LED3
MODE
LED4
CVDD
0.1uF, 50V
CS GND DIM
RCS
1%
220 VAC
Total 288 LEDs
GND
Figure 2.
22 W at 220 VAC LED Tube-Type Application
© 2016 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FL77944• Rev. 1.2
2
Pin Configuration
VIN
NC
1
2
3
4
5
6
7
8
16
MODE
VDD
15
14
13
12
11
10
9
LED1
NC
GND
NC
LED4
DIM
CS
LED2
NC
LED3
NC
GND
Figure 3.
SOIC-16 EP (Top View)
Thermal Characteristics (1) (2)
JA
(1S PCB)
JA
(2S2P PCB)
Component
Package
16-Pin Small-Outline Integrated Circuit (SOIC-EP)
Unit
FL77944MX
102
24
°C/W
Notes:
1. ΘJA: Thermal resistance between junction and ambient, dependent on the PCB design, heat sinking, and airflow.
The value given is for natural convection with no heatsink using the 1S and 2S2P board, as specified in JEDEC
standards JESD51-2, JESD51-5, and JESD51-7, as appropriate.
2. Junction-to-air thermal resistance is highly dependent on application and PCB layout. In application where the
device dissipates high levels of power during operation, special care of thermal dissipation issues in PCB design
must be taken.
Pin Definitions
Pin#
Name
Description
Rectified AC Input Voltage. Connect this pin to rectified AC voltage after a bridge rectifier.
1
3
VIN
LED1
LED2
LED3
LED4
5
LED String Cathodes. Connect cathode(s) of each LED group to these pins.
7
12
Ground Reference Pin. Tie this pin directly to local ground plane. This ground should not be
tied to earth ground because it is not isolated from AC mains.
9, 14
10
GND
CS
LED Current Sensing Pin. Limits the LED current depending on voltage across sensing
resistor. The CS pin is used to set the LED current regulation target.
Dimming Signal Input Pin. When MODE pin is tied to GND, this pin is used to further adjust
LED current, based on given RCS value. Apply 0 V to 5 V as the DIM signal. Both analog and
digital PWM signal can be used.
11
15
DIM
Internal Biasing Shunt regulator Output. Voltage on this pin supplies internal circuitry of
FL77944. A 17-V shunt regulator is internally connected to this pin. A bypassing capacitor is
recommended to be added to reduce noise from VIN.
VDD
Mode Pin. Connect this pin to VDD to disable DIM pin. Connect this pin to GND to enable
DIM-pin functionality.
16
0
MODE
EP
Exposed Thermal Pad. EP is not tied to GND inside the IC. It is recommended to tie it to
GND externally.
© 2016 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FL77944 • Rev. 1.2
3
Block Diagram
VIN
1
LED1
3
5
7
Shunt
Regulator
15
VDD
LED Current
Modulator
LED2
LED3
LED4
DIM
11
Over-
Temperature
Protection
LED
Current
Feedback
12
MODE
16
9
14
10
GND
GND
CS
Figure 4.
Simplified Block Diagram
© 2016 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FL77944 • Rev. 1.2
4
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
VIN
Parameter
Min.
-0.3
-0.3
-0.3
-0.3
-0.3
-0.3
-0.3
-55
Max.
500.0
500.0
500.0
500.0
200.0
6.0
Unit
V
VIN Voltage
VLED1
VLED2
VLED3
VLED4
VCS
LED1 Pin Voltage
LED2 Pin Voltage
LED3 Pin Voltage
LED4 Pin Voltage
CS Pin Voltage
DIM Pin Voltage
Junction Temperature
Storage Temperature
LED1 Current
V
V
V
V
V
VDIM
TJ
6.0
V
+150
+150
80
ºC
ºC
mA
mA
mA
mA
TSTG
ILED1
ILED2
ILED3
-65
LED2 Current
160
LED3 Current
160
ILED4
LED4 Current
240
Notes:
3. Stress beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device.
4. All voltage values, except differential voltages, are given with respect to the GND pin.
5. Human Body Model, ANSI/ESDA/JEDEC JS-001-2012: 0.9 kV at Pins 1, 3, 5, 7; 0.4 kV at Pin 12; 1.0 kV at Pins
10, 11, 15, 16.
6. Charged Device Model, JESD22-C101: 1.0 kV at all pins.
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to Absolute Maximum Ratings.
Symbol
Parameter
Operating Junction Temperature
Min.
Max.
Unit
Tj
-40
+125
°C
© 2016 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FL77944 • Rev. 1.2
5
Electrical Characteristics
Unless otherwise noted, RCS = 10 Ω (1%), TA = 25°C. Currents are defined as positive into the device and negative
out of the device.
Symbol
VIN Supply
IQUIES.VIN
Parameter
Conditions
Min. Typ. Max. Unit
VIN Quiescent Current
VDD Voltage
VIN = 20 to 500 V
1.2
1.5
18
mA
V
VDD Output
VDD
VIN = 20.0 V
15.5
16.8
LED Current
ILED1
ILED2
ILED3
ILED4
LED1 Current
LED2 Current
LED3 Current
LED4 Current
VIN = 20.0 V, VLED1 = 20.0 V
VIN = 20.0 V, VLED2 = 20.0 V
VIN = 20.0 V, VLED3 = 35.0 V
VIN = 20.0 V, VLED4 = 20.0 V
9.0
16.9
36.1
82.8
91.7
21.0
41.2
88.6
97.7
mA
mA
mA
mA
31.0
77.0
85.7
Over-Temperature Protection
TOTP
OTP Temperature(7)
Leakage Current
170
°C
ILED1-LK
ILED2-LK
ILED3-LK
ILED4-LK
LED1 Leakage Current
VLED1 = 500 V, VIN = 0 V
VLED2 = 500 V, VIN = 0 V
VLED3 = 500 V, VIN = 0 V
VLED4 = 200 V, VIN = 0 V
1
1
1
1
µA
µA
µA
µA
LED2 Leakage Current
LED3 Leakage Current
LED4 Leakage Current
Note:
7. Not tested in production. Internal over-temperature protection circuitry protects the device from permanent
damage. LEDs shut down at the junction temperature of TJ=170°C (typical).
© 2016 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FL77944 • Rev. 1.2
6
Typical Performance Characteristics
1.1
1.03
1.02
1.01
1
1.05
1
0.99
0.98
0.97
0.95
0.9
-40 -20
0
25 40 60 80 100 120 140
-40 -20
0
25 40 60 80 100 120 140
Temperature(ºC)
Temperature(ºC)
Figure 5.
IQUIES.VIN vs. Temperature
Figure 6.
VDD vs. Temperature
1.01
1.005
1
1.01
1.005
1
0.995
0.99
0.995
0.99
-40 -20
0
25
40
60
80 100 120 140
-40 -20
0
25 40 60 80 100 120 140
Temperature(ºC)
Temperature(ºC)
Figure 7.
ILED1 vs. Temperature
Figure 8.
ILED2 vs. Temperature
1.01
1.005
1
1.01
1.005
1
0.995
0.99
0.995
0.99
-40 -20
0
25 40 60 80 100 120 140
-40 -20
0
25 40 60 80 100 120 140
Temperature(ºC)
Temperature(ºC)
Figure 9.
ILED3 vs. Temperature
Figure 10. ILED4 vs. Temperature
© 2016 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FL77944 • Rev. 1.2
7
Functional Description
The FL77944 can drive LED strings attached directly to
the rectified AC mains using only two external RC
components (RCS and CVDD). With 4 integrated high
voltage current sink, LED current in each string is
precisely controlled with system compactness. High PF
and low THD are obtained by the optimized current sink
levels. Phase-cut dimming is easily obtained with wide
dimming range and good dimmer compatibility.
Dedicated DIM pin can be used to implement analog or
digital dimming function. Flicker index in the direct AC
drive topology can be improved by adopting proprietary
self valley-fill solution.
This smooth current transition reduces frequency
harmonic contents and improves power factor as well as
Electromagnetic Interference (EMI) characteristics.
By fully utilizing available headroom, the FL77944 offers
maximum power, high efficiency, power factor and low
harmonic distortion. Typically, power factor is higher
than 0.98 and THD is lower than 20%. The efficiency
heavily depends on a LED configuration.
LED Current and Power Setting
The LED current is managed by an external current
sense resistor RCS. Regulation target of each channel's
current sink is calculated as follows.
Operation
0.18
0.37
When the rectified AC line voltage, VIN, is higher than
the forward voltage of the consecutive LED groups,
each LED group turns on automatically as the
corresponding current sink has enough voltage
headroom across it. Each current sink increases up to
the predefined current level and maintains that level
until the following channel’s current sink get enough
voltage headroom across it.
ILED1
, ILED2
,
RCS
RCS
(1)
0.83
0.92
ILED3
, and ILED4
.
RCS
RCS
Root-mean-square (RMS) value of the input current can
be calculated using the peak regulated current, ILED4
,
AC Line
Voltage (VIN
and crest factor. Since the LED current waveform is
similar to the AC line voltage, the crest factor is close to
the crest factor of a sine wave, √2=1.414. But the actual
crest factor depends on the flattened time of the ILED4
and LED configuration. With FL77944, the typical crest
factor approximately is 1.4. Thus, based on estimated
input power, PIN, the RCS resistor value can be
calculated as follows.
LED Current
)
(IF)
ILED4
ILED3
VF1'''+VF2''+VF3'+VF4
VF1''+VF2'+VF3
ILED2
VF1'+VF2
ILED1
VF1
0.92VAC .RMS
RCS
(2)
tD1 tD2
tD3
tD4
tD3 tD2 tD1
1.4 P
IN
·
·
·
·
·
tD1: Current is directed to LED1 pin through 1st LED group.
tD2: Current is directed to LED2 pin through 1st and 2nd LED groups.
tD3: Current is directed to LED3 pin through 1st, 2nd, and 3rd LED groups.
tD4: Current is directed to LED4 pin through 1st, 2nd, 3rd, and 4th LED groups.
VF1/VF1'/VF1''/VF1''': Forward voltage at forward current of ILED1/ILED2/ILED3/ILED4
in 1st LED group.
The actual RCS needs to be adjusted with respect to the
LED configuration.
·
VF2/VF2'/VF2'': Forward voltage at forward current of ILED2/ILED3/ILED4 in 2nd LED
group.
LED Configuration
In the LED configuration, it is required to increase the
total LED forward voltage to improve efficiency. For
example, compared to using 4 LEDs with VF of 60 V
(total VF = 60 V x 4 channels = 240 V) for each LED
·
·
VF3/VF3': Forward voltage at forward current of ILED3/ILED4 in 3rd LED group.
VF4: Forward voltage at forward current of ILED4 in 4th LED group.
Figure 11. FL77944 Operation
group, using 4 LEDs with VF equal to 65 V (total VF
65 V x 4 channels = 260 V) will improve the efficiency
simply due to the higher total VF. Each LED channel can
=
When VIN reaches to the forward voltage across the
1st LED group (VF1) at forward current IF = ILED1, the
current drawn from the VIN is directed to the LED1
through the 1st LED group. In sequence, when VIN
reaches forward voltage across 1st and 2nd LED
groups (VF1'+VF2) at IF = ILED2, the current is directed to
LED2 across 1st and 2nd LED groups. Then, when VIN
reaches VF1''+VF2'+VF3 at IF=ILED3, the LED current
goes through 1st, 2nd, and 3rd LED groups and sinks
have different VF. For example, if
a design is
implemented with 144 pieces of 3-V LEDs for
replacement of 2-feet fluorescent lamp, designer can
assign flexible numbers of LEDs for LED channels such
as 25s2p-32s2p-6s2p-18s1p (“s” stands for LEDs in
series and “p” stands for LEDs in parallel) or 18s2p-
18s2p-18s2p-36s1p.
to
the
LED3.
Finally,
when
VIN
reaches
VF1'''+VF2''+VF3'+VF4 at IF=ILED4
through all 4 LED groups and is directed to the LED4.
,
the current goes
Which needs to be considered is that VF of first LED
group should be higher than VIN-pin turn-on voltage,
which is 20 V. If the VF of the first LED group is
configured to be lower than VIN-pin turn-on voltage,
ILED1 will not have the correct regulation level when input
voltage, VIN, is just exceeds the VF.
Whenever the active channel (one that is sinking LED
current) is changed from one channel to the adjacent
channel with respect to the change in the VIN, the new
active channel's current increases gradually while the
existing active channel's current decreases gradually.
© 2016 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FL77944 • Rev. 1.2
8
IF1
A good starting point for choosing a LED configuration is
to have about 260 V~280 V of the total VF for 220 VAC
VIN
1st LED
group
}
mains and 130 V~140 V of the total VF for 120 VAC
.
P1
P2
S1
S2
S3
S4
}
}
}
}
VIN
Internal Shunt Regulator Output, VDD
LED1
LED2
LED3
LED4
VDD
The system implemented with FL77944 does not require
a bulk capacitor after bridge-rectification diodes. As a
result, the VDD, which supplies biasing voltage for the
FL77944, has voltage ripple like the rectification voltage
after the bridge diodes as shown in Figure 12.
IF2
2nd LED
group
}
MODE
CVDD
CS GND DIM
IF3
3rd LED
group
}
+
VDIM
-
P3
P4
RCS
VIN
GND
4th LED
group
IF4
}
* S1, S2, S3, S4: Number of LEDs in series each LED group
* P1, P2, P3, P4: Number of LEDs in parallel each LED group
VDD
Figure 13. Analog or PWM dimming Application
To enable dimming mode, the MODE pin should be tied
to GND. The LED channel sink and total RMS current
through LEDs will be linearly adjusted with the VDIM level
as shown Figure 14 and Figure 15.
VDD valley
Figure 12. VDD Ripple without CVDD
LED Channel Sink Current vs. VDIM
The VDD ripple can be reduced by a bypassing
capacitor, CVDD. If the CVDD is not used, or its value is
small, the VDD voltage fluctuates and goes even down to
0 V. It makes the FL77944 reset, but the FL77944
automatically restarts every cycle when the AC line
voltage reaches a certain level. For a much stable
operation, to implement CVDD is preferred. The
recommended CVDD value is 1 µF with 50 V of voltage
rating.
0.1
0.09
0.08
0.07
0.06
ILED1
0.05
ILED2
0.04
ILED3
0.03
0.02
ILED4
0.01
0
Over-Temperature Protection (OTP)
The FL77944 is with over temperature protection (OTP)
inherently. When the driver's junction temperature
exceeds a specified threshold temperature (TJ = 170°C),
the driver will shut down automatically and then recover
automatically once the temperature drops lower enough
than the internal threshold temperature. Without this
protection, the lifetime of the FL77944 can be reduced
and irreparable damage can occur when it operates
above its maximum junction temperature (150°C). Good
thermal management is required to achieve best
performance and long life span of the FL77944.
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
VDIM[V]
Figure 14. Measured LED Channel Sink
Current vs. VDIM (RCS = 10 Ω)
RMS LED Current vs. VDIM
80
70
60
50
40
30
20
10
0
Analog/PWM Dimming Function
The FL77944 uses the DIM pin for analog, 0 V to 10 V,
or pulse width modulation (PWM) dimming by applying a
voltage signal between 0 to 5 V or PWM signals with 5-
V peaks to the DIM pin.
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
VDIM[V]
Figure 15. Current vs. VDIM
(Simulation results: RCS=10 Ω / VAC = 120 V)
© 2016 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FL77944 • Rev. 1.2
9
10.10
9.70
A
5.08
0.65
B
16
9
8
0.50
4.10
3.70
6.20
5.80
7.35 2.50
1.27
3.85
1.75
1
PIN #1
1.27
0.51
0.31
8.89
M
0.25
C B A
LAND PATTERN RECOMMENDATION
TOP VIEW
0.50
0.25
1.50
1.25
0.70
0.60
B
8°
0°
C
0.90
0.10
C
0.26
0.50
0.25
0.05
0.10
1.75 MAX
1.05
0.25
FRONT VIEW
SIDE VIEW
DETAIL B
SCALE 2:1
4.72
3.86
1
8
9
NOTES:
A. NO INDUSTRY STANDARD APPLIES TO
THIS PACKAGE
2.56
1.68
B. ALL DIMENSIONS ARE IN MILLIMETERS
C. DIMENSIONS DO NOT INCLUDE MOLD
FLASH OR BURRS
0.40
D. DRAWING FILENAME: MKT-M16Hrev2
16
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