FL7733A ONSEMI | Alldatasheet
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© 2014 Fairchild Semiconductor Corporation www.fairchildsemi.com FL7733AMX • Rev. 1.2 FL7733A — Primary-Side-Regulated LED Driver with Power Factor Correction FL7733A Primary-Side-Regulated LED Driver with Power Factor Correction
Features
< ±3% Total Constant Current Tolerance Over All Conditions < ±1% Over Universal Line Voltage Variation < ±1% from 50% to 100% Load Voltage Variation < ±1% with ±20% Magnetizing Inductance Variation Primary-Side Regulation (PSR) Control for Cost- Effective Solution without Requiring Input Bulk Capacitor and Secondary Feedback Circuitry Application Input Voltage Range: 80 VAC - 308 VAC High PF of >0.9, and Low THD of < 10% Over Universal Line Input Range Fast < 200 ms Start-up (at 85 VAC) using Internal High-Voltage Startup with VDD Regulation Adaptive Feedback Loop Control for Startup without Overshoot System Protection 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
Applications
Low to Mid Power LED Lighting Systems of 5 W to greater than 60 W Compatible with Analog Dimming function
Description
The FL7733A is a highly-integrated PWM controller with advanced Primary-Side Regulation (PSR) technique to minimize components in low-to-mid-power LED lighting converters . Using an innovative TRUECURRENT® technology to provide tight tolerance constant-current output, th is LED driver enables designs with constant current ( CC) tolerance of less than ±1% over the universal line voltage range to meet stringent LED brightness requirements. By minimizing turn-on time fluctuation, high power factor and low THD over the universal line range are obtained in the FL7733A . 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 FL7733A also provides powerful protections, such as LED short / open, output diode short, sensing resistor short / open, and over-temperature for high system reliability. The FL7733A controller is available in an 8-pin Small- Outline Package (SOP). Related Product Resources FL7733A Product Folder
Ordering Information
Part Number Operating Temperature Range Package Packing Method FL7733AMX -40°C to +125°C 8-Lead, Small Outline Package (SOP-8) Tape & Reel
Figure 1. Typical Application
0.3 VSLP
Figure 2. Functional Block Diagram
Figure 3. Top Mark Figure 4. Pin Configuration (Top View) constant output current regulation.
3 GND Ground
4 VDD Power Supply. IC operating current and MOSFET driving current are supplied using this pin. regulation. This pin is connected to the auxiliary winding of the transformer via a resistor divider. and GND for compensating the current loop gain.
7 NC No Connect
8 HV High Voltage. This pin is connected to the rectified input voltage via a resistor.
© 2014 Fairchild Semiconductor Corporation www.fairchildsemi.com FL7733AMX • Rev. 1.2 4 FL7733A — Primary-Side-Regulated LED Driver with Power Factor Correction Absolute Maximum Ratings Stresses exceeding the absolute maximum ratings may dama ge 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 HV HV Pin Voltage 700 V VVDD DC Supply Voltage(1,2) 30 V VVS VS Pin Input Voltage -0.3 6.0 V VCS CS Pin Input Voltage -0.3 6.0 V VCOMI COMI Pin Input Voltage -0.3 6.0 V VGATE GATE Pin Input Voltage -0.3 30.0 V PD Power Dissipation (TA＜50°C) 633 mW TJ Maximum Junction Temperature 150 °C TSTG Storage Temperature Range -55 150 °C TL Lead Temperature (Soldering) 10 Seconds 260 °C Notes: 1. Stresses beyond those listed under Absolute Maximum Ratings m ay cause permanent damage to the device. 2. All voltage values, except differential voltages, are given with res pect to GND pin. Thermal Impedance TA=25°C, unless otherwise specified. Symbol Parameter Value Unit θJA Junction-to-Ambient Thermal Impedance 158 °C/W θJC Junction-to-Case Thermal Impedance 39 °C/W Note: 3. Referenced the JEDEC recommended environment, JESD51-2, and test boa rd, JESD51-3, 1S1P with minimum land pattern. ESD Capability Symbol Parameter Value Unit ESD Human Body Model, ANSI/ESDA/JEDEC JS-001-2012 5 kV Charged Device Model, JESD22-C101 2 Note: 4. Meets JEDEC standards JESD22-A114 and JESD 22-C101.
© 2014 Fairchild Semiconductor Corporation www.fairchildsemi.com FL7733AMX • Rev. 1.2 5 FL7733A — Primary-Side-Regulated LED Driver with Power Factor Correction
Electrical Characteristics
VDD=15 V, T J=-40 to +1 25°C, unless otherwise specified. Currents are defined as positi ve into the device and negative out of device. Symbol Parameter Conditions Min. Typ. Max. Unit VDD-ON Turn-On Threshold Voltage 14.5 16.0 17.5 V VDD-OFF Turn-Off Threshold Voltage 6.75 7.75 8.75 V IDD-OP Operating Current CL=1 nF, f=fMAX-CC 3 4 5 mA IDD-ST Startup Current VDD=VDD-ON–1.6 V 30 50 μA VVDD-OVP VDD Over-Voltage Protection Level 23 24 25 V GATE SECTION VOL Output Voltage Low TA=25°C, VDD=20 V, IDD_GATE=1 mA 1.5 V VOH Output Voltage High TA=25°C, VDD=10 V, IDD=1 mA 5 V ISOURCE Peak Sourcing Current(5) VDD=10 ~ 20 V -60 mA ISINK Peak Sinking Current(5) VDD=10 ~ 20 V 180 mA tR Rising Time TA=25°C, VDD=15 V, CLOAD =1 nF 100 150 200 ns tF Falling Time TA=25°C, VDD=15 V, CLOAD=1 nF 20 60 100 ns VCLAMP Output Clamp Voltage VDD=20 V, VCS=0 V, VVS=0 V, VCOM=0 V 12 15 18 V HV STARTUP SECTION IHV Supply Current From HV Pin TA=25°C, VIN=90 VAC, VDD =0 V 9 mA IHV-LC Leakage Current after Startup 1 10 μA tR-JFET JFET Regulation Time after Startup(5) TA=25°C 190 250 310 ms VJFET-HL JFET Regulation High Limit Voltage 17.5 19.0 20.5 V VJFET-LL JFET Regulation Low Limit Voltage 11.5 13.0 14.5 V CURRENT-ERROR-AMPLIFIER SECTION gM Transconductance(5) TA=25°C 11 17 23 μmho ICOMI-SINK COMI Sink Current TA=25°C, VEAI=2.55 V, VCOMI=5 V 12 18 24 μA ICOMI-SOURCE |COMI Source Current| TA=25°C, VEAI=0.45 V, VCOMI=0 V 12 18 24 μA VCOMI-HGH COMI High Voltage VEAI=0 V 4.7 V VCOMI-LOW COMI Low Voltage VEAI=5 V 0.1 V VCOMI_INT.CLP Initial COMI Clamping Voltage(5) 1.2 V tCOMI_INT.CLP Time for Initial COMI Clamping(5) 15 ms Continued on the following page…
© 2014 Fairchild Semiconductor Corporation www.fairchildsemi.com FL7733AMX • Rev. 1.2 6 FL7733A — Primary-Side-Regulated LED Driver with Power Factor Correction Electrical Characteristics (Continued) VDD=15 V, T J=-40 to +125°C, unless otherwise specified. Currents are defined as positive into the device and negative out of device. Symbol Parameter Conditions Min. Typ. Max. Unit VOLTAGE-SENSE SECTION tDIS-BNK tDIS Blanking Time of VS (5) 0.85 1.15 1.45 μs IVS-BNK VS Current for VS Blanking -75 -90 -105 μA VVS-OVP VS Level for Output Over-Voltage Protection 2.95 3.00 3.15 V VVS-LOW-CL-EN VS Threshold Voltage to Enable Low Current Limit(5) 0.25 0.30 0.35 V VVS-HIGH-CL-DIS VS Threshold Voltage to Disable Low Current Limit(5) 0.54 0.60 0.66 V VVS-SLP-TH VS Threshold Voltage for Output Short-LED Protection 0.25 0.30 0.35 V tSLP-BNK VS Detection Disable Time after Startup(5) TA=25°C 15 ms CURRENT-SENSE SECTION VRV Reference Voltage TA=25°C 1.485 1.500 1.515 V tLEB Leading-Edge Blanking Time(5) 300 ns tMIN Minimum On Time in CC(5) VCOMI =0 V 500 ns tPD Propagation Delay to GATE Output 50 100 150 ns VCS-HIGH-CL High Current Limit Threshold 0.9 1.0 1.1 V VCS-LOW-CL Low Current Limit Threshold 0.16 0.20 0.24 V tLOW-CM Low Current Mode Operation Time at Startup(5) 20 ms VCS-SRSP VCS Threshold Voltage for Sensing Resistor Short Protection 0.1 V VCS-OCP VCS Threshold Voltage for Over- Current Protection TA=25°C 1.20 1.35 1.50 V VCS / IVS Relation of Line Compensation Voltage and VS Current(5)
21.5 V/A
fMAX-CC Maximum Frequency in CC TA=25°C, VS=3.0 V 65 70 75 kHz fMIN-CC Minimum Frequency in CC TA=25°C, VS=0.3 V 23.0 26.5 30.0 kHz tON-MAX Maximum Turn-On Time TA=25°C, f=fMAX-CC 11.0 13.0 15.0 μs OVER-TEMPERATURE-PROTECTION SECTION TOTP Threshold Temperature for OTP(5) 150 oC TOTP-HYS Restart Junction Temperature Hysteresis(5) 10 oC Note: 5. These parameters, although guaranteed by design, are not prod uction tested.
dominant VDD supply current source.
16 V /
Figure 17. Startup Block level inversely proportional to V IN peak value for 5 ms. Figure 18. Startup Sequence Figure 19. Power Factor Correction
0.3 V due to a short-LED condition , the cycle- by-cycle
19 V /
Figure 24. Internal SLP Block Figure 25. Waveforms in Short-LED Condition voltage is applied as the reflected output voltage. Figure 26. Internal OVP Block Figure 27. Waveforms in LED Open Condition
0.1 V in the first switching cycle , the GATE output is
through the high-voltage JFET to enable the FL7733A . until the auxiliary winding voltage is above 7.75 V.
OCP comparator output shuts down GATE switching. then switching is shut down immediately. hysteresis temperature after OTP triggering is 10°C. minimize switching noise into control signals.
- The signal ground and power ground should be
resistors should be short and wide.
- Gate-driving current path (GATE – RGATE – MOSFET
– RCS – GND) must be as short as possible.
- Control pin components; such as C COMI, C VS, and
- High-voltage traces related to the drain of MOSFET
control circuits to avoid unnecessary interference.
- If a heat sink is used for the MOSFET, connect this
- The auxiliary winding ground should be connected
Figure 28. Layout Example
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