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PDF FL7732M Data sheet ( Hoja de datos )
| Número de pieza | FL7732M | |
| Descripción | Single-Stage PFC Primary-Side-Regulation Offline LED Driver | |
| Fabricantes | Fairchild Semiconductor | |
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Hay una vista previa y un enlace de descarga de FL7732M (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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October 2012
FL7732
Single-Stage PFC Primary-Side-Regulation Offline
LED Driver
Features
Cost-Effective Solution: No Input Bulk Capacitor or
Feedback Circuitry
Power Factor Correction
Accurate Constant-Current (CC) Control,
Independent Online Voltage, Output Voltage,
and Magnetizing Inductance Variation
Linear Frequency Control Improves Efficiency and
Simplifies 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
VDD Under-Voltage Lockout (UVLO)
Gate Output Maximum Voltage Clamped at 18 V
SOP-8 Package
Application Voltage Range: 80 VAC ~ 308 VAC
Applications
LED Lighting System
Description
This highly integrated PWM controller provides several
features to enhance the performance of low-power
flyback converters. The proprietary topology,
TRUECURRENT® enables simplified circuit design for
LED lighting applications.
By using single-stage topology with primary-side
regulation, a LED lighting board can be implemented
with few external components and minimized cost. No
input bulk capacitor or feedback circuitry is required. To
implement good power factor and low THD, 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
adjusted by the output voltage to guarantee DCM
operation with higher efficiency and simpler design.
FL7732 provides open-LED, short-LED, and over-
temperature protection features. The current limit level
is automatically reduced to minimize output current and
protect external components in a short-LED condition.
The FL7732 controller is available in an 8-pin Small-
Outline Package (SOP).
Ordering Information
Part Number
FL7732M_F116
Operating
Temperature Range
Package
-40°C to +125°C 8-Lead, Small Outline Integrated Circuit Package (SOIC)
Packing
Method
Tape & Reel
© 2011 Fairchild Semiconductor Corporation
FL7732 • Rev. 1.0.6
www.fairchildsemi.com
1 page  
Electrical Characteristics
VDD=15 V and TA=25°C, unless otherwise specified.
Symbol
Parameter
VDD Section
VDD-ON
VDD-OFF
Turn-On Threshold Voltage
Turn-Off Threshold Voltage
IDD-OP
Operating Current
IDD-ST
VOVP
Startup Current
VDD Over-Voltage-Protection Level
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
tLEB
tMIN
tPD
tDIS-BNK
Reference Voltage
EAI Voltage for CC Regulation
Leading-Edge Blanking Time
Minimum On Time in CC
Propagation Delay to GATE
tDIS Blanking Time of VS
IVS-BNK VS Current for VS Blanking
Current-Error-Amplifier Section
Gm Transconductance
ICOMI-SINK COMI Sink Current
ICOMI-SOURCE
VCOMI-HGH
VCOMI-LOW
COMI Source Current
COMI High Voltage
COMI Low Voltage
Condition
At Maximum Frequency
CL=1 nF
VDD=VDD-ON – 0.16 V
VDD=20 V, IGATE=-1 mA
VDD=10 V, IGATE=+1 mA
VDD=10 ~ 20 V
VDD=10 ~ 20 V
CL=1 nF
CL=1 nF
VDD=10 V, 20 V
VDD=10 V, 20 V
f=fMAX-2 kHz
f=fMIN +2 kHz
VCS=0.44 V
VCOMI=0 V
VEAI=3 V, VCOMI=5 V
VEAI=2 V, VCOMI=0 V
VEAI=2 V
VEAI=3 V
Min. Typ. Max. Unit
14.5 16.0 17.5
6.75 7.75 8.75
V
V
3 4 5 mA
2 20 μA
22.0 23.5 25.0
V
1.5 V
5V
60 mA
180 mA
100 150 200 ns
20 60 100 ns
12 15 18 V
60 65 70 kHz
21.0 23.5 26.0 kHz
2.25 2.35 2.45
V
0.55 0.85 1.15
V
12 14 16 μs
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
85 μmho
25 38 μA
25 38 μA
4.9 V
0.1 V
Continued on the following page…
© 2011 Fairchild Semiconductor Corporation
FL7732 • Rev. 1.0.6
5
www.fairchildsemi.com
5 Page 
Figure 21. Internal OVP Block
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 FL7732. 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 FL7732 has a built-in temperature-sensing circuit to
shut 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 is shut down immediately.
Figure 22. Waveforms in Open-LED Condition
© 2011 Fairchild Semiconductor Corporation
FL7732 • Rev. 1.0.6
11
www.fairchildsemi.com
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet FL7732M.PDF ] | |
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