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PDF FL7730 Data sheet ( Hoja de datos )
| Número de pieza | FL7730 | |
| Descripción | Single-Stage Primary-Side-Regulation PWM Controller | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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October 2012
FL7730
Single-Stage Primary-Side-Regulation PWM Controller
for PFC and LED Dimmable Driving
Features
Compatible with Traditional TRIAC Control
(No need to change existing lamp infrastructure:
wall switch & wire)
Compatible with Non-Dimming Lamp Designs
Cost-Effective Solution without Input Bulk Capacitor
and Feedback Circuitry
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
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
Application Voltage Range: 80 VAC ~ 308 VAC
Applications
LED Lighting System
Description
This highly integrated PWM controller, FL7730, 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.
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.
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 FL7730
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.
The FL7730 controller is available in an 8-pin Small
Outline Package (SOP).
Related Resources
Evaluation Board: FEBFL7730_L20L008A
Evaluation Board: FEBFL7730_L20H008A
Ordering Information
Part Number Operating Temperature Range
Package
FL7730MY_F116
-40°C to +125°C
8-Lead, Small Outline Package (SOP-8)
Packing
Method
Tape & Reel
© 2011 Fairchild Semiconductor Corporation
FL7730 • Rev. 1.0.8
www.fairchildsemi.com
1 page  
Electrical Characteristics
VDD=20 V and TA=25°C unless otherwise specified.
Symbol
Parameter
VDD Section
VDD-ON Turn-On Threshold Voltage
VDD-OFF Turn-Off Threshold Voltage
IDD-OP Operating Current
IDD-ST
VOVP
Startup Current
VDD Over-Voltage-Protection
Gate Section
VOL
VOH
Isource
Isink
tr
tf
VCLAMP
Output Voltage Low
Output Voltage High
Peak Sourcing Current
Peak Sinking Current
Rising Time
Falling Time
Output Clamp Voltage
Oscillator Section
fMAX-CC
fMIN-CC
VSMAX-CC
VSMIN-CC
tON(MAX)
Maximum Frequency in CC
Minimum Frequency in CC
VS for Maximum Frequency in CC
VS for Minimum Frequency in CC
Maximum Turn-On Time
Current Sense Section
VRV
VCCR
Reference Voltage
EAI Voltage for Constant Current
Regulation
tLEB
tMIN
tPD
ttdis-BNK
Leading-Edge Blanking Time
Minimum On Time in CC
Propagation Delay to GATE
tDIS Blanking Time of VS
ICOMI-BNK VS Current for COMI Blanking
Current-Error Amplifier Section
Gm Transconductance
ICOMI-SINK COMI Sink Current
ICOMI-SOURCE COMI Source Current
VCOMI-HGH COMI High Voltage
VCOMI-LOW COMI Low Voltage
Condition
Min. Typ. Max. Unit
Maximum Frequency,
CLOAD = 1 nF
VDD = VDD-ON – 0.16 V
14.5
6.75
3
22.0
16.0
7.75
4
2
23.5
17.5
8.75
5
20
25.0
V
V
mA
μA
V
VDD=20 V,IGATE=-1 mA
VDD=10 V,IGATE=+1 mA
VDD = 10 ~ 20 V
VDD = 10 ~ 20 V
CLOAD = 1 nF
CLOAD = 1 nF
5
100
20
12
60
180
150
60
15
1.5 V
V
mA
mA
200 ns
100 ns
18 V
f = fMAX -2 kHz
f = fMIN +2 kHz
60 65
21.0 23.5
2.25 2.35
0.55 0.85
12 14
70 kHz
26.0 kHz
2.45 V
1.15 V
16 μs
VCS = 0.44 V
VCOMI = 0 V
2.475
2.38
50
2.500
2.43
300
600
100
1.5
100
2.525
2.48
150
V
V
ns
ns
ns
μs
μA
VEAI=3 V, VCOMI=5 V
VEAI=2 V, VCOMI=0 V
VEAI=2 V
VEAI=3 V
85
28
28
4.9
μmho
38 μA
38 μA
V
0.1 V
Continued on the following page…
© 2011 Fairchild Semiconductor Corporation
FL7730 • Rev. 1.0.8
5
www.fairchildsemi.com
5 Page 
Open-LED Protection
FL7730 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.
Under-Voltage Lockout (UVLO)
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 FL7730. 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.
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.
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
© 2011 Fairchild Semiconductor Corporation
FL7730 • Rev. 1.0.8
11
www.fairchildsemi.com
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet FL7730.PDF ] | |
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