FL6630 [ONSEMI]
Single-Stage Primary-Side-Regulation PWM Controller;
| 型号： | FL6630 |
| 厂家： | 
ONSEMI |
| 描述： | Single-Stage Primary-Side-Regulation PWM Controller |
| 文件： | 总14页 (文件大小：453K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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May 2015
FL6630
Single-Stage Primary-Side-Regulation PWM Controller
for PFC and LED Dimmable Driving
Features
Description
.
Compatible with Traditional TRIAC Control
(No need to change existing lamp infrastructure:
wall switch & wire)
This highly integrated PWM controller, FL6630, provides
several features to enhance the performance of single-
stage flyback converters. The proprietary topology,
TRUECURRENT®, enables the simplified circuit design
for LED lighting applications.
.
.
Compatible with Non-Dimming Lamp Designs
Cost-Effective Solution without Input Bulk Capacitor
and Feedback Circuitry
TRIAC dimming is smoothly managed by dimming
brightness control without flicker. By using single-stage
topology with primary-side regulation, an LED lighting
board can be implemented with few external
components and minimized cost. It does not require an
input bulk capacitor or feedback circuitry. To implement
good power factor and low total harmonic distortion,
constant on-time control is utilized with an external
capacitor connected to the COMI pin.
.
.
Power Factor Correction (PFC)
Accurate Constant-Current (CC) Control,
Independent Online Voltage, Output Voltage,
Magnetizing Inductance Variation
.
.
Line Voltage Compensation for CC Control
Linear Frequency Control for Better Efficiency and
Simple Design
Precise constant-current control regulates accurate
output current versus changes in input voltage and
output voltage. The operating frequency is proportionally
changed by the output voltage to guarantee
Discontinuous Conduction Mode (DCM) operation with
higher efficiency and simpler design. The FL6630
provides protections such as open-LED, short-LED, and
over-temperature protections. Current-limit level is
automatically reduced to minimize output current and
protect external components in a short-LED condition.
.
.
.
.
.
.
.
.
Open-LED Protection
Short-LED Protection
Cycle-by-Cycle Current Limiting
Over-Temperature Protection with Auto Restart
Low Startup Current: 20 μA
Low Operating Current: 5 mA
SOP-8 Package Available
The FL6630 controller is available in an 8-pin Small
Outline Package (SOP).
Application Voltage Range: 80 VAC ~ 308 VAC
Applications
.
LED Lighting System
Ordering Information
Packing
Part Number Operating Temperature Range
Package
Method
FL6630MX
-40°C to +125°C
8-Lead, Small Outline Package (SOP-8)
Tape & Reel
© 2015 Fairchild Semiconductor Corporation
FL6630 • Rev. 1.0
www.fairchildsemi.com
Application Diagram
TRIAC Dimmer
BRIDGE DIODE
TRANS
Line
input
FUSE
FL6630
4
5
7
3
2
8
6
1
VDD
DIM
GATE
GND
VS
COMI
GND
CS
Figure 1.
Typical Application
Internal Block Diagram
Shutdown
Internal
Bias
Max. Duty
Controller
Gate
Driver
2
GATE
VDD Good
+
-
VDD
4
S
R
Q
VOVP
OCP Level
Controller
VS
OSC
-
1
7
CS
LEB
+
VOCP
GND
3
+
VSOVP
S
R
Q
TSD
Sawtooth
Generator
-
VDD good
DCM
BCM
COMI
TRIAC
Dimming
Function
5
8
DIM
Line
Compensator
Error
Amp.
Linear Frequency
Controller
TRUECURRENT®
Calculation
+
VREF
tDIS
Detector
6
VS
VSOVP
-
Freq.
3V
GND
Sample & Hold
VS
Figure 2.
Functional Block Diagram
© 2015 Fairchild Semiconductor Corporation
FL6630 • Rev. 1.0
www.fairchildsemi.com
2
Marking Information
F: Fairchild Logo
Z: Plant Code
X: 1-Digit Year Code
Y: 1-Digit Week Code
TT: 2-Digit Die Run Code
T: Package Type (M=SOP)
P: Z: Pb Free, Y: Green Package
M: Manufacture Flow Code
ZXYTT
6630
TPM
Figure 3.
Top Mark
Pin Configuration
CS 1
GATE
8
7
GND
2
COMI
GND
VDD
3
4
6 VS
5
DIM
Figure 4.
Pin Configuration
Pin Definitions
Pin # Name
Description
Current Sense. This pin connects a current-sense resistor to detect the MOSFET current for the
output-current regulation in constant current regulation.
1
2
CS
PWM Signal Output. This pin uses the internal totem-pole output driver to drive the power
MOSFET.
GATE
Ground
3
4
5
GND
VDD
DIM
Power Supply. IC operating current and MOSFET driving current are supplied using this pin.
Dimming. This pin controls the dimming operation of LED lighting.
Voltage Sense. This pin detects the output voltage information and discharge time for linear
frequency control and constant-current regulation. This pin connects divider resistors from the
auxiliary winding.
6
VS
Constant Current Loop Compensation. This pin is the output of the transconductance error
amplifier.
7
8
COMI
GND
Ground
© 2015 Fairchild Semiconductor Corporation
FL6630 • Rev. 1.0
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
Parameter
Min.
Max.
Unit
VVDD
VVS
DC Supply Voltage(1,2)
VS Pin Input Voltage
CS Pin Input Voltage
DIM Pin Input Voltage
COMI Pin Input Voltage
GATE Pin Input Voltage
30
7.0
7.0
7.0
7.0
30.0
633
V
V
-0.3
-0.3
-0.3
-0.3
-0.3
VCS
V
VDIM
VCOMI
VGATE
PD
V
V
V
Power Dissipation (TA＜50°C)
mW
θJA
Thermal Resistance (Junction-to-Air)
158
°C /W
θJC
Thermal Resistance (Junction-to-Case)
Maximum Junction Temperature
39
°C /W
°C
TJ
TSTG
150
150
260
Storage Temperature Range
-55
°C
TL
Lead Temperature (Soldering, 10 Seconds)
°C
Notes:
1. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device.
2. All voltage values, except differential voltages, are given with respect to the GND pin.
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 Ambient Temperature
Min.
Max.
Unit
TA
-40
125
°C
© 2015 Fairchild Semiconductor Corporation
FL6630 • Rev. 1.0
www.fairchildsemi.com
4
Electrical Characteristics
VDD=20 V and TA=25°C unless otherwise specified.
Symbol
VDD Section
VDD-ON
Parameter
Condition
Min.
Typ.
Max.
Unit
Turn-On Threshold Voltage
Turn-Off Threshold Voltage
14.5
6.75
16.0
7.75
17.5
8.75
V
V
VDD-OFF
Maximum Frequency,
CLOAD = 1 nF
IDD-OP
Operating Current
3
4
5
mA
IDD-ST
Startup Current
VDD = VDD-ON – 0.16 V
2
20
μA
VOVP
VDD Over-Voltage-Protection
22.0
23.5
25.0
V
Gate Section
VOL
VOH
Isource
Isink
Output Voltage Low
Output Voltage High
Peak Sourcing Current
Peak Sinking Current
Rising Time
VDD = 20 V,IGATE=-1 mA
VDD = 10 V,IGATE=+1 mA
VDD = 10 ~ 20 V
VDD = 10 ~ 20 V
CLOAD = 1 nF
1.5
V
V
5
60
180
150
60
mA
mA
ns
ns
V
tr
100
20
200
100
18
tf
Falling Time
CLOAD = 1 nF
VCLAMP
Output Clamp Voltage
12
15
Oscillator Section
fMAX-CC Maximum Frequency in CC
fMIN-CC Minimum Frequency in CC
VDD = 10 V, 20 V
VDD = 10 V, 20 V
f = fMAX-2 kHz
60
65
70
kHz
kHz
V
21.0
2.73
0.55
12
23.5
2.80
1.10
14
26.0
2.96
1.15
16
VSMAX-CC VS for Maximum Frequency in CC
VSMIN-CC VS for Minimum Frequency in CC
f = fMIN +10 kHz
V
tON(MAX)
Maximum Turn-On Time
s
Current Sense Section
VRV
Reference Voltage
2.475
2.38
2.500
2.43
2.525
2.48
V
V
EAI Voltage for Constant Current
Regulation
VCCR
VCS = 0.44 V
VCOMI = 0 V
tLEB
tMIN
Leading-Edge Blanking Time
Minimum On Time in CC
Propagation Delay to GATE
tDIS Blanking Time of VS
300
600
100
1.5
ns
ns
ns
s
A
tPD
50
150
ttdis-BNK
ICOMI-BNK VS Current for COMI Blanking
100
Current-Error Amplifier Section
Gm
Transconductance
85
mho
A
ICOMI-SINK COMI Sink Current
ICOMI-SOURCE COMI Source Current
VCOMI-HGH COMI High Voltage
VCOMI-LOW COMI Low Voltage
VEAI = 3 V, VCOMI = 5 V
VEAI = 2 V, VCOMI = 0 V
VEAI = 2 V
28
28
38
38
A
4.9
V
VEAI = 3 V
0.1
V
Continued on the following page…
© 2015 Fairchild Semiconductor Corporation
FL6630 • Rev. 1.0
www.fairchildsemi.com
5
Electrical Characteristics
VDD=15 V, TJ=-40 to +125°C, unless otherwise specified. Currents are defined as positive into the device and
negative out of device.
Symbol
Parameter
Condition
Min.
Typ.
Max.
Unit
Over-Current Protection Section
VOCP
VCS Threshold Voltage for OCP
0.60
0.13
0.67
0.18
13
0.74
0.23
V
V
VLowOCP VCS Threshold Voltage for Low OCP
tstartup
Startup Time
ms
V
VLowOCP-EN VS Threshold Voltage to Enable Low OCP Level
VLowOCP-DIS VS Threshold Voltage to Disable Low OCP Level
VVS-OVP VS Level for Output Over-Voltage Protection
Over-Temperature Protection Section
0.40
0.60
3.0
V
2.9
3.1
V
TOTP
Threshold Temperature for OTP(3)
140
150
10
160
°C
°C
TOTP-HYS Restart Junction Temperature Hysteresis
Dimming Section
VDIM-LOW Maximum VDIM at Low Dimming Angle Range
VDIM-HIGH Maximum VDIM at High Dimming Angle Range
2.45
3.43
2.50
3.50
2.55
3.57
V
V
VDIM vs. Vcs,offset Slope at Low Dimming Angle
DSLOW
Range
0.19
0.58
V/V
V/V
VDIM vs. Vcs,offset Slope at High Dimming Angle
DSHIGH
Range
Note:
3. If over-temperature protection is activated, the power system enters Auto Recovery Mode and output is disabled.
Device operation above the maximum junction temperature is NOT guaranteed.
© 2015 Fairchild Semiconductor Corporation
FL6630 • Rev. 1.0
www.fairchildsemi.com
6
Typical Performance Characteristics
1.5
1.3
1.1
0.9
0.7
0.5
1.5
1.3
1.1
0.9
0.7
0.5
-40
-30
-15
0
25
50
75
85
100 125
-40
-30
-15
0
25
50
75
85
100 125
Temp [°C]
Temp [°C]
Figure 5.
VDD-ON vs. Temperature
Figure 6.
VDD-OFF vs. Temperature
1.5
1.3
1.1
0.9
0.7
0.5
1.5
1.3
1.1
0.9
0.7
0.5
-40
-30
-15
0
25
50
75
85
100 125
-40
-30
-15
0
25
50
75
85
100 125
Temp [°C]
Temp [°C]
Figure 7.
IDD-OP vs. Temperature
Figure 8.
VOVP vs. Temperature
1.5
1.3
1.1
0.9
0.7
0.5
1.5
1.3
1.1
0.9
0.7
0.5
-40
-30
-15
0
25
50
75
85
100 125
-40
-30
-15
0
25
50
75
85
100 125
Temp [°C]
Temp [°C]
Figure 9.
fMAX-CC vs. Temperature
Figure 10. fMIN-CC vs. Temperature
© 2015 Fairchild Semiconductor Corporation
FL6630 • Rev. 1.0
www.fairchildsemi.com
7
Typical Performance Characteristics
1.5
1.3
1.1
0.9
0.7
0.5
1.5
1.3
1.1
0.9
0.7
0.5
-40
-30
-15
0
25
50
75
85
100 125
-40
-30
-15
0
25
50
75
85
100 125
Temp [°C]
Temp [°C]
Figure 11. VRV vs. Temperature
Figure 12. VCCR vs. Temperature
1.5
1.3
1.1
0.9
0.7
0.5
1.5
1.3
1.1
0.9
0.7
0.5
-40
-30
-15
0
25
50
75
85
100 125
-40
-30
-15
0
25
50
75
85
100 125
Temp [°C]
Temp [°C]
Figure 13. VOCP vs. Temperature
Figure 14. VOCP-Low vs. Temperature
2.5
2.0
1.5
1.0
0.5
0.0
1.5
1.3
1.1
0.9
0.7
0.5
-40
-30
-15
0
25
50
75
85
100
125
-40
-30
-15
0
25
50
75
85
100 125
Temp [°C]
Temp [°C]
Figure 15. DSLOW vs. Temperature
Figure 16. DSHIGH vs. Temperature
© 2015 Fairchild Semiconductor Corporation
FL6630 • Rev. 1.0
www.fairchildsemi.com
8
Functional Description
FL6630 is AC-DC dimmable PWM controller for LED
lighting applications. TRUECURRENT® technique and
internal line compensation regulates accurate LED
current independent of input voltage, output voltage,
and magnetizing inductance variations. The TRIAC dim
function block provides smooth brightness dimming
control compatible with a conventional TRIAC dimmer.
The linear frequency control in the oscillator reduces
conduction loss and maintains DCM operation in a wide
range of output voltages, which implements high power
factor correction in a single-stage flyback topology. A
variety of protections; such as short-LED protection,
open-LED protection, over-temperature protection, and
cycle-by-cycle current limitation; stabilize system
operation and protect external components.
compared with an internal precise reference to generate
an error voltage (VCOMI), which determines turn-on time
in Voltage Mode control. With Fairchild’s innovative
TRUECURRENT® technique, constant current output
can be precisely controlled.
PFC and THD
In
a
conventional boost converter, Boundary
Conduction Mode (BCM) is generally used to keep
input current in phase with input voltage for Power
Factor (PF) and Total Harmonic Distortion (THD).
However, in flyback / buck boost topology, constant
turn-on time and constant frequency in Discontinuous
Conduction Mode (DCM) can implement high PF and
low THD, as shown in Figure 18. Constant turn-on time
is maintained by an internal error amplifier and a large
external capacitor (typically >1 µF) at the COMI pin.
Constant frequency and DCM operation are managed
by linear frequency control.
Startup
Powering at startup is slow due to the low feedback loop
bandwidth in the PFC converter. To boost power during
startup, an internal oscillator counts 12 ms to define
Startup Mode. During Startup Mode, turn-on time is
determined by Current Mode control with a 0.2 V CS
voltage limit and transconductance becomes 14 times
larger, as shown in Figure 17. After Startup Mode, turn-
on time is controlled by Voltage Mode using the COMI
voltage and the error amplifier transconductance is
reduced to 85 mho.
IIN
IIN_AVG
VDD = VDD_ON
VIN
GATE
VCS
Constant Frequency
0.2V
Figure 18. Input Current and Switching
Linear Frequency Control
14·gm gm
VCOMI
DCM should be guaranteed for high power factor in
flyback topology. To maintain DCM in the wide range of
output voltage, frequency is linearly adjusted by output
voltage in linear frequency control. Output voltage is
detected by auxiliary winding and resistive divider
connected to the VS pin, as shown in Figure 19.
Startup Mode: 12ms
ILED
OSC
Time
VOUT
Figure 17. Startup Sequence
Linear Frequency
Controller
Constant-Current Regulation
VS
f
The output current is estimated using the peak drain
current and inductor current discharge time because
output current is same as the average of the diode
current in steady state. The peak value of the drain
current is determined by the CS pin. The inductor
discharge time (tDIS) is sensed by a tDIS detector. Using
three sources of information (peak drain current,
inductor discharging time, and operating switching
period), a TRUECURRENT® block calculates estimated
output current. The output of the calculation is
6
VS
Figure 19. Linear Frequency Control
© 2015 Fairchild Semiconductor Corporation
FL6630 • Rev. 1.0
www.fairchildsemi.com
9
When output voltage decreases, secondary diode
conduction time is increased and the linear frequency
control lengthens switching period, which retains DCM
operation in the wide output voltage range, as shown in
Figure 20. The frequency control lowers primary rms
current for better power efficiency in full-load condition.
To disable the dimming function, a 1 nF filter capacitor
can be added at the DIM pin. An internal current source
(~7.5 µA) on the DIM pin charges the filter capacitor up
to 4 V. FL6630 goes into IC Test Mode when DIM
voltage is over 6 V; so the maximum DIM voltage should
be limited to less than 5 V.
Primary
Current
Secondary
Current
Short-LED Protection
In a short-LED condition, the switching MOSFET and
secondary diode are usually stressed by the high
powering current. However, FL6630 changes the OCP
level in a short-LED condition. When VS is lower than
0.4 V, the OCP level becomes down to 0.2 V from 0.7 V,
as shown in Figure 22, so that powering is limited and
external components’ current stress is relieved.
nVo
Lm
Vo =
Vo.nom
T
tDIS
3
4
Lm
n
Vo
Vo =
75% Vo.nom
-
1
CS
LEB
4
3
4
3
T
+
tDIS
VOCP
3
5
n
Vo
Vo =
60% Vo.nom
Lm
At VS < 0.4V,
VOCP = 0.2V
5
3
6
VS
T
5
3
tDIS
At VS > 0.6V,
VOCP = 0.7V
Figure 20. Primary and Secondary Current
BCM Control
Figure 22. Internal OCP Block
The end of secondary diode conduction time can be
over a switching period set by linear frequency control.
In this case, FL6630 doesn’t allow CCM and operation
mode changes from DCM to BCM. Therefore, FL6630
originally eliminates sub-harmonic distortion in CCM.
Figure 23 shows operational waveforms in short-LED
condition. Output voltage is quickly lowered to 0 V after
the LED-short event. The reflected auxiliary voltage is
also 0 V, making VS less than 0.4 V. The 0.2 V OCP
level limits primary-side current and VDD hiccups up and
down in between UVLO hysteresis.
Dimming Control
TRIAC dimmable control is implemented by simple and
noise-immune external passive components and an
internal dimming function block. Figure 21 shows
dimming angle detection and the internal dimming
control block. Dimming angle is sensed by Zener diode
and Zener diode voltage is divided by two resistors (RD1
and RD2) to fit the sensing range of the DIM pin. The
detected signal is filtered by capacitor CD to provide DC
voltage into the DIM pin. The internal dimming control
adds CSoffset to the peak current value as the input of
TRUECURRENT® calculation block. When the dimming
LED Short!
VIN
VCS
0.2V
angle is small, lowered DIM voltage increases CSoffset
,
which makes calculated output current larger and
reduces turn-on time to dim the LED brightness.
VDD
VDD_ON
CS
VIN
1
VDD_OFF
LEB
RBIAS
DIM
CD
TRIAC Dim
Function
RD1
Figure 23. Waveforms in Short-LED Condition
CSoffset
5
RD2
VZ
TRUECURRENT®
Calculation
DIM
Figure 21. Dimming Control Schematic
© 2015 Fairchild Semiconductor Corporation
FL6630 • Rev. 1.0
www.fairchildsemi.com
10
Under-Voltage Lockout (UVLO)
Open-LED Protection
The turn-on and turn-off thresholds are fixed internally at
16 V and 7.5 V, respectively. During startup, the VDD
capacitor must be charged to 16 V through the startup
resistor to enable the FL6630. The VDD capacitor
continues to supply VDD until power can be delivered
from the auxiliary winding of the main transformer. VDD
must not drop below 7.5 V during this startup process.
This UVLO hysteresis window ensures that the VDD
capacitor is adequate to supply VDD during startup.
FL6630 protects external components, such as diodes
and capacitors on the secondary side, in the open-LED
condition. During switch-off, the VDD capacitor is
charged up to the auxiliary winding voltage, which is
applied as the reflected output voltage. Because the VDD
voltage has output voltage information, the internal
voltage comparator on the VDD pin can trigger output
Over-Voltage Protection (OVP), as shown in Figure 24.
When at least one LED is open-circuited, output load
impedance becomes very high and output capacitor is
quickly charged up to VOVP x Ns / Na. Then switching is
shut down and VDD block goes into “Hiccup” Mode until
the open-LED condition is removed, shown in Figure 25.
Over-Temperature Protection (OTP)
The built-in temperature-sensing circuit shuts down
PWM output if the junction temperature exceeds 150°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 16 V, all the
internal circuits start operating. If the junction
temperature is still higher than 140°C, the PWM
controller shuts down immediately.
Internal
Bias
VDD Good
+
-
VDD
4
VOVP
Shutdown Gate Driver
S
Q
VDD Good
R
Figure 24. Internal OVP Block
LED Open !
VDD
VDD_OVP
VDD_ON
VDD_OFF
VOUT
VDD_OVP x Ns/Na
GATE
Figure 25. Waveforms in Open-LED Condition
© 2015 Fairchild Semiconductor Corporation
FL6630 • Rev. 1.0
www.fairchildsemi.com
11
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