Document
FL7701 — Smart LED Lamp Driver IC with PFC Function
June 2013
FL7701 Smart LED Lamp Driver IC with PFC Function
Features
Digitally Implemented Active PFC Function
(No Additional Circuit Necessary for High PF)
Built-in HV Supplying Circuit: Self Biasing Application Input Range: 80 VAC ~ 308 VAC AOCP Function with Auto-Restart Mode Built-in Over-Temperature Protection Function Cycle-by-Cycle Current Limit Current-Sense Pin Open Protection Low Operating Current: 0.85 mA (Typical) Under-Voltage Lockout with 5 V Hysteresis Programmable Oscillation Frequency Programmable LED Current Analog Dimming Function Soft-Start Function Precise Internal Reference: ±3%
Applications
LED Lamp for Decorative Lighting LED Lamp for Low-Power Lighting
Description
The FL7701 LED lamp driver is a simple IC with PFC function. The special “adopted digital” technique of the IC can automatically detect input voltage condition and send an internal reference signal for achieving high power factor. When AC input is applied to the IC, PFC function is automatically enabled. Otherwise, when DC input is applied to the IC, PFC function is automatically disabled. The FL7701 does not need a bulk capacitor (electrolytic capacitor) for supply rail stability, which can significantly affect to LED lamp system.
Related Resources
Evaluation Board: FEBFL7701_L30U003A
Ordering Information
Part Number
Operating Temperature Range
FL7701MX
-40°C to +125°C
Package
Packing Method
8-Lead, Small Outline Integrated Circuit (SOIC), JEDEC MS-012, .150-inch Narrow Body
Tape & Reel
© 2011 Fairchild Semiconductor Corporation FL7701 • Rev. 1.0.4
www.fairchildsemi.com
FL7701 — Smart LED Lamp Driver IC with PFC Function
Application Diagram
BD
L1
Fuse
C1 C2 C3
CS HV OUT NV VCC GND RT ADIM
R1 U1
D1 D2
R2
LED L3 Q1
C4 R3
L2
Figure 1. Typical Application
Block Diagram
VCC 3
VCC ZCD
IAD
time
ZCD
UVLO
JFET
ADIM 5
DAC
Soft start
Digital Block
RT 4 Oscillator
Reference
GND 6
TSD
SQ
R
+
LEB
Leading Edge Blanking
2.5V
+
AOCP
Figure 2. Block Diagram
8 HV
2 OUT 1 CS
© 2011 Fairchild Semiconductor Corporation FL7701 • Rev. 1.0.4
2
www.fairchildsemi.com
FL7701 — Smart LED Lamp Driver IC with PFC Function
FL7701
Pin Configuration
CS OUT VCC
RT
HV NV GND ADIM
Figure 3. Pin Configuration
Pin Definitions
Pin # 1 2 3 4
5
6 7 8
Name CS OUT VCC RT
ADIM
GND NC HV
Description
Current Sense. Limits output current depending on the sensing resistor voltage. The CS pin is also used to set the LED current regulation
OUT. Connects to the MOSFET gate.
VCC. Supply pin for stable IC operation ZCD signal detection used for accurate PFC function.
RT. Programmable operating frequency using external resistor and the IC has pre-fixed frequency when this pin is open or floating.
Analog Dimming. Connect to the internal current source and can change the output current using an external resistor. If ADIM is not used, it is recommended to connect a 0.1 µF bypass capacitor between the ADIM and GND.
GROUND. Ground for the IC.
No Connection
High Voltage. Connect to the high voltage line and supply current to the IC
© 2011 Fairchild Semiconductor Corporation FL7701 • Rev. 1.0.4
3
www.fairchildsemi.com
FL7701 — Smart LED Lamp Driver IC with PFC Function
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
VCC IC Supply Voltage HV High Voltage Sensing
20 V 500 V
IO+/IOVADIM VRT VCS
TA TJ TSTG θJA PD
ESD
Peak Drive Output Current (Sourcing / Sinking) Analog Dimming RT Pin Voltage Allowable Current Sensing Detection Voltage Operating Ambient Temperature Range Operating Junction Temperature Storage Temperature Range Thermal Resistance Junction-Air(1,2) Power Dissipation
Human Body Model, JESD22-A114 Electrostatic Discharge Capability
Charged Device Model, JESD22-C101
-40 -40 -65
250 5 5 5
+125 +150 +150 135 660 2000 1000
mA V V V C C C C/W mW
V
Notes: 1. Thermal resistance test board. Size: 76.2 mm x 114.3 mm x 1.6 mm (1S0P); JEDEC standard: JESD51-2, JESD51-
3. 2. Assume no ambient airflow.
© 2011 Fairchild Semiconductor Corporation FL7701 • Rev. 1.0.4
4
www.fairchildsemi.com
FL7701 — Smart LED Lamp Driver IC with PFC Function
Electrical Characteristics
Typical values are at TA = +25°C. Specifications to -40°C ~ 125°C are guaranteed by design based on final characterization results.
Symbol
Parameter
VCC Bias Section VCC VCC Regulator Output Voltage
VCCST+ UVLO Positive Going Threshold VCCST- UVLO Negative Going Threshold VCCHY UVLO Hysteresis
IHV HV Pin Current
IST Startup Current Switching Section
Conditions
Min..