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PDF FL7733 Data sheet ( Hoja de datos )
| Número de pieza | FL7733 | |
| Descripción | Primary-Side-Regulated LED Driver | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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July 2014
FL7733
Primary-Side-Regulated LED Driver with Power Factor
Correction
Features
High Performance
Cost-Effective Solution without Requiring Input Bulk
Capacitor and Secondary Feedback Circuitry
Power Factor Correction
THD <10% Over Universal Line Range
Constant Current Tolerance:
< ±1% Over Universal Line Voltage Variation
< ±1% by 50% - 100% Load Voltage Variation
< ±1% by ±20% Magnetizing Inductance Variation
High-Voltage Startup with VDD Regulation
Adaptive Feedback Loop Control for Startup without
Overshoot
High Reliability
LED Short / Open Protection
Output Diode Short Protection
Sensing Resistor Short / Open Protection
VDD Over-Voltage Protection (OVP)
VDD Under-Voltage Lockout (UVLO)
Over-Temperature Protection (OTP)
All Protections are Auto Restart (AR)
Cycle-by-Cycle Current Limit
Application Input Voltage Range: 80 VAC - 308 VAC
Applications
LED Lighting System
Description
This highly integrated PWM controller with advanced
Primary-Side Regulation (PSR) technique provides
features to enhance the performance of low-to-mid-
power LED lighting converter. The FL7733 LED driver is
designed with minimum system components while LED
current is accurately controlled by Fairchild’s
TRUECURRENT® technique and improved feedback
loop control. Constant Current (CC) tolerance less than
±1% over the universal line voltage range meets the
requirement of highly reliable LED brightness
management.
By minimizing turn-on time fluctuation, high power
factor, and low THD; <10% THD over the universal line
range can be obtained. An integrated high-voltage
startup circuit implements fast startup and high system
efficiency. During startup, adaptive feedback loop
control anticipates the steady-state condition and sets
initial feedback condition close to the steady state to
ensure no overshoot or undershoot of LED current.
The FL7733 provides powerful protections, such as LED
short / open, output diode short, sensing resistor short /
open, and over-temperature for high system reliability.
The FL7733 controller is available in an 8-pin Small-
Outline Package (SOP).
Related Resources
AN-5076 — Design High Power Factor Flyback Converter
using FL7733 for LED Driver with Ultra-Wide Output
Voltage
AN-FEBFL7733_L50U008A — User Guide for
FEBFL7733_L50U008A Evaluation Board of 8.4 W LED
Driver (PFC PSR Flyback)
AN-FEBFL7733_L52U050A — User Guide for
FEBFL7733_L52U050A Evaluation Board of 50 W LED
Driver (PFC PSR Flyback)
Ordering Information
Part Number Operating Temperature Range
FL7733MX
-40°C to +125°C
Package
8-Lead, Small Outline Package (SOP-8)
Packing Method
Tape & Reel
© 2014 Fairchild Semiconductor Corporation
FL7733 • Rev. 1.0.2
www.fairchildsemi.com
1 page  
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
Conditions
VDD-ON
VDD-OFF
IDD-OP
IDD-ST
Turn-On Threshold Voltage
Turn-Off Threshold Voltage
Operating Current
Startup Current
CL=1 nF, f=fMAX-CC
VDD=VDD-ON–1.6 V
VVDD-OVP VDD Over-Voltage Protection Level
GATE SECTION
VOL
VOH
ISOURCE
ISINK
tR
tF
VCLAMP
Output Voltage Low
Output Voltage High
Peak Sourcing Current(5)
Peak Sinking Current(5)
Rising Time
Falling Time
Output Clamp Voltage
TA=25°C, VDD=20 V,
IDD_GATE=1 mA
TA=25°C, VDD=10 V,
IDD=1 mA
VDD=10 ~ 20 V
VDD=10 ~ 20 V
TA=25°C, VDD=15 V,
CLOAD =1 nF
TA=25°C, VDD=15 V,
CLOAD=1 nF
VDD=20 V, VCS=0 V,
VVS=0 V, VCOM=0 V
HV STARTUP SECTION
IHV
IHV-LC
tR-JFET
Supply Current From HV Pin
Leakage Current after Startup
JFET Regulation Time after
Startup(5)
TA=25°C, VIN=90 VAC,
VDD =0 V
TA=25°C
VJFET-HL
VJFET-LL
JFET Regulation High Limit Voltage
JFET Regulation Low Limit Voltage
CURRENT-ERROR-AMPLIFIER SECTION
gM Transconductance(5)
ICOMI-SINK
COMI Sink Current
ICOMI-SOURCE |COMI Source Current|
VCOMI-HGH
VCOMI-LOW
VCOMI_INT.CLP
tCOMI_INT.CLP
COMI High Voltage
COMI Low Voltage
Initial COMI Clamping Voltage(5)
Time for Initial COMI Clamping(5)
TA=25°C
TA=25°C, VEAI=2.55 V,
VCOMI=5 V
TA=25°C, VEAI=0.45 V,
VCOMI=0 V
VEAI=0 V
VEAI=5 V
Min.
14.5
6.75
3
23
Typ.
16.0
7.75
4
30
24
Max.
17.5
8.75
5
50
25
Unit
V
V
mA
μA
V
1.5 V
5V
-60 mA
180 mA
100 150 200
ns
20 60 100 ns
12 15 18
V
9
1 10
190 250 310
17.5 19.0 20.5
11.5 13.0 14.5
mA
μA
ms
V
V
11 17 23 μmho
12 18 24 μA
12 18 24 μA
4.7 V
0.1 V
1.2 V
15 ms
Continued on the following page…
© 2014 Fairchild Semiconductor Corporation
FL7733 • Rev. 1.0.2
5
www.fairchildsemi.com
5 Page 
Figure 24. Waveforms in Short-LED Condition
Open-LED Protection
FL7733 protects external components, such as output
diodes and output capacitors, during open-LED
condition. During switch turn-off, the auxiliary winding
voltage is applied as the reflected output voltage.
Because the VDD and VS voltages have output voltage
information through the auxiliary winding, the internal
voltage comparators in the VDD and VS pins can trigger
output Over-Voltage Protection (OVP), as shown in
Figure 25 and Figure 26.
Figure 26. Waveforms in LED Open Condition
Sensing Resistor Short Protection (SRSP)
In a sensing resistor short condition, the VCS level is
almost zero and pulse-by-pulse current limit or OCP is
not effective. The FL7733 is designed to provide
sensing resistor short protection for both current and
voltage mode operation. If the VCS level is less than
0.1 V in the first switching cycle, the GATE output is
stopped by current-mode SRSP. After 20 ms startup
time, the GATE is shut down by the voltage-mode
SRSP if VCS level is less than 0.1 V at over 60% level of
peak VIN.
Under-Voltage Lockout (UVLO)
The VDD turn-on and turn-off thresholds are fixed
internally at 16 V and 7.75 V, respectively. During
startup, the VDD capacitor must be charged to 16 V
through the high-voltage JFET to enable the FL7733.
The VDD capacitor continues to supply VDD until auxiliary
power is delivered from the auxiliary winding of the main
transformer. VDD should remain higher than 7.75 V
during this startup process. Therefore, the VDD capacitor
must be adequate to keep VDD over the UVLO threshold
until the auxiliary winding voltage is above 7.75 V.
Figure 25. Internal OVP Block
Over-Current Protection (OCP)
When an output diode or secondary winding are
shorted, switch current with extremely high di/dt can
flow through the MOSFET even by minimum turn-on
time. The FL7733 is designed to protect the system
against this excessive current. When the CS voltage
across the sensing resistor is higher than 1.35 V, the
OCP comparator output shuts down GATE switching.
In a sensing resistor open condition, the sensing resistor
voltage can’t be detected and output current is not
regulated properly. If the sensing resistor is damaged
open-circuit, the parasitic capacitor in the CS pin is
charged by internal CS current sources. Therefore, the
VCS level is built up to the OCP threshold voltage and
then switching is shut down immediately.
© 2014 Fairchild Semiconductor Corporation
FL7733 • Rev. 1.0.2
Over-Temperature Protection (OTP)
The temperature-sensing circuit shuts down PWM
output if the junction temperature exceeds 150°C. The
hysteresis temperature after OTP triggering is 10°C.
www.fairchildsemi.com
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet FL7733.PDF ] | |
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