SEMICONDUCTOR FC Pin Switch-Mode LED Lamp Driver IC FC9921 TECHNICAL DATA

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1 SEMICONDUCTOR TECHNICAL DATA FC99 3-Pin Switch-Mode LED Lamp Driver IC Features Constant output current: 0mA Universal 85-65VAC operation Fixed off-time buck converter Internal 475V power MOSFET Applications Decorative lighting General Description The FC99 from voltage sources ranging up to 400VDC. The FC99 includes an internal high voltage switching MOSFET controlled ) of approximately 0.5μs. The LED OFF string is driven at constant current, thus providing constant light output and enhanced reliability. The output current is internally FC99 provides good regulation of the output current throughout the universal AC line voltage range of 85 to 65VAC or DC input voltage of 0 to 400V. Typical Application Circuit AC LED - LED n FC99 3 VDD DRAIN GND /8

2 Absolute Maximum Ratings Pin Configurations Parameter Value Supply voltage, V DD -0.3 to +0V Supply current, I DD +5mA Operating ambient temperature range -40 ºC to +85 Operating junction temperature range -40 ºC to +5 Storage temperature range -65 ºC to +50 Power 5, TO-9 740mW Power 5, SOT mW (Mounted on FR4 board, 5mm x 5mm x.57mm) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 3 Top DRAIN GND VDD View 3 VDD SOT-89 TO-9 DRAIN Note : Also limited by package power dissipation limit, whichever is lower. Electrical Characteristics GND Bottom View (Specifications are at T A = 5 C and VDRAIN =50V, unless otherwise noted) Symbol Description Min. Typ. Max. Units Conditions Regulator (V DD ) V DD V DD regulator output V --- V DRAIN V DRAIN supply voltage V --- V UVLO V DD undervoltage threshold V --- ΔV UVLO V DD undervoltage lockout hysteresis mv --- I DD Operating supply current µa V DD(EXT) = 8.5V, V DRAIN = 40V Output (DRAIN) V BR Breakdown voltage * V --- R ON On-resistance Ω I DRAIN = 0mA C DRAIN Output capacitance # pf V DRAIN = 400V I SAT MOSFET saturation current # ma --- Current Sense Comparator I TH Threshold average current * ma --- T BLANK Leading edge blanking delay * # ns --- T ON(MIN) Minimum on-time ns --- OFF-Time Generator T OFF µs --- Note: *- Denotes the specifications which apply over the full operating ambient temperature range of - 40 < T A < # - Denotes guaranteed by design. /8

3 Typical Performance Characteristics (T J = 5 C unless otherwise noted) Normalized Threshold Current ON Resistance (Ohm) Junction Temperature, C Junction Temperature ( C) OFF Time (us) DRAIN Capacitance (pf) Junction Temperature ( C) DRAIN Voltage (V) DRAIN Breakdown Voltage (V) Junction Temperature, C DRAIN Current, ma T J = 5 C T J = 5 C DRAIN Voltage (V) 3/8

4 Functional Description The FC99 is a PWM peak current controller for controlling a buck converter topology in continuous conduction mode (CCM). The output current is internally preset at 0mA. When the input voltage of 0 to 400V appears at the DRAIN pin, the internal high-voltage linear regulator seeks to maintain a voltage of 7.5VDC at the VDD pin. Until this voltage exceeds the internally programmed under-voltage threshold, the output switching MOSFET is non-conductive. When the threshold is exceeded, the MOSFET turns on. The is provided in the under-voltage comparator to prevent oscillation. When the input current exceeds the internal preset level, MOSFET turns off. At the same time, a one-shot circuit is activated that determines the duration of the off-state (0.5µs The new switching cycle begins. A blanking delay of 300ns is provided that prevents false triggering of the current sense comparator due to the leading edge spike caused by circuit parasitics. Application Information The FC99 is a low-cost off-line buck converter IC be operated from either universal AC line range of 85 to 65VAC, or 0 to 400VDC, and drives up to tens of high brightness LEDs. All LEDs can be run in series, and the FC99 regulates at constant current, yielding uniform illumination. The FC99 is compatible with triac dimmers. where I TH is the current sense comparator threshold. The ripple current introduces a peak-to-average error in the output current setting that needs to be accounted for. Due to the constant off-time control technique used in the FC99, the ripple current is independent of the input AC or DC line voltage variation. Therefore, the output current will remain unaffected by the varying input voltage. the output current ripple even further, thus permitting a reduced value of L. However, one must keep in mind that the peak-to-average current error is affected by the variation of T OFF. Therefore, the initial output current accuracy might Another important aspect of designing an LED driver with the FC99 is related to certain parasitic elements of the circuit, including distributed coil capacitance of L, junction capacitance of the printed circuit board traces C PCB and output capacitance C DRA N of the controller itself. These parasitic could potentially cause false triggering of the current sense comparator if not properly managed. Minimizing these the FC99. Coil capacitance of inductors is typically provided in the manufacturer s data books either directly or in terms of the self-resonant frequency (SRF). SRF = / (π (L C L )) where L is the inductance value, and C L is the coil capacitance.) Charging and discharging this capacitance every switching cycle causes high-current spikes in the LED string. Therefore, connecting a small capacitor C O (~0nF) is recommended to bypass these spikes. available in space saving TO-9 and SOT-89 packages. Selecting L and D There is a certain trade-off to be considered between optimal sizing of the output inductor L and the tolerated output current ripple. The required value of L is inversely proportional to the ripple current I O in it. L = (V O T OFF ) / ΔI O () V O is the forward voltage of the LED string. T OFF is the offtime of the FC99. The output current in the LED string (I O ) is calculated then as: I O = I TH - (ΔI O / ) () of the current sense comparator. Using diodes with shorter reverse recovery time t rr and lower junction capacitance C J achieves better performance. The reverse voltage rating V R of the diode must be greater than the maximum input voltage of the LED lamp. The total parasitic capacitance present at the DRAIN pin of the FC99 can be calculated as: C P = C DRAIN + C PCB +C L +C J (3) When the switching MOSFET turns on, the capacitance C P is discharged into the DRAIN pin of the IC. The discharge 4/8

5 current is limited to about 50mA typically. However, it may become lower at increased junction temperature. The duration of the leading edge current spike can be estimated as: T SPIKE = ((V IN C P ) / (I SAT )) +t rr (4) In order to avoid false triggering of the current sense comparator, C P must be minimized in accordance with the following expression: C P < I SAT (T BLANK(MIN) - t rr ) (5) V IN(MAX) Conduction power loss in the FC99 can be calculated as: P COND = (D I O R ON ) + [I DD V IN ( - D)] (9) where D = V O /ηv IN is the duty ratio, R ON is the on-resistance, I DD is the internal linear regulator current. When the LED driver is powered from the full-wave conduction loss is more cumbersome. However, it can be estimated using the following equation: P COND = (K C I O R ON ) + (K D I DD V AC ) (0) where T BLANK(MIN) is the minimum blanking time of 00ns, and V IN(MAX) is the maximum instantaneous input voltage. Estimating Power Loss where V AC C and K d can be determined from the minimum duty ratio of the FC Discharging the parasitic capacitance C P into the DRAIN pin of the FC99 is responsible for the bulk of the switching power loss. It can be estimated using the following equation: P SWITCH = [(V IN C P ) / + V IN I SAT t rr ] F S (6) where F S is the switching frequency, I SAT is the saturated DRAIN current of the FC99. The switching loss is the greatest at the maximum input voltage. The switching frequency is given by the following: Kd(Dm) Kc(Dm) where η F S = (V IN - η - V O ) / V IN T OFF (7) When the FC99 LED driver is powered from the full-wave as: P SWITCH (8) (V AC C P + I SAT t rr )(V AC - η - V O ) T OFF V AC is the input AC line voltage. The switching power loss associated with turn-off transitions of the DRAIN pin can be disregarded. Due to the large amount of parasitic capacitance connected to this switching node, the turn-off transition occurs essentially at zero-voltage. Fig Dm C and K d EMI Filter As w to obtaining good EMI. A switching side capacitor, albeit of small value, is necessary in order to ensure low impedance to the high frequency switching currents of the converter. As a rule of thumb, this capacitor should be approximately 0.- shown in Figure for the following design example. Design Example Let us design an FC99 LED lamp driver meeting the Input: Universal AC, 85-65VAC Output Current: 0mA Load: String of 0 LED (LW54C by OSRAM V F = 4.V max. each) 5/8

6 Step. Calculating L. The output voltage V O = 0 x V F 4V (max.). Use equation () assuming a 30% peak-to-peak ripple. L = (4V 0.5µs) / (0.3 0mA) = 7mH Select L 68mH, I = 30mA. Typical SRF = 70KHz. Calculate the coil capacitance. Step 5. Estimating power dissipation in FC99 at 65VAC using (8) and (0) Switching power loss: P SWITCH = (65V 3pF + 00mA 0ns)(65V - 4V) 0.5µs 0.7 C L = = L (π SRF) 68mH (π 70kHz) P SWITCH 65mW Minimum duty ratio: D M = 4V / (0.7 65V ) 0.6 3pF Step. Selecting D Usually, the reverse recovery characteristics of ultra- = 0 ~ 50mA are not provided in the F manufacturer s data books. The designer may want to experiment with different diodes to achieve the best result. Select D MUR60 with V R = 600V, t rr 0ns (I F = 0mA, I RR = 00mA) and C J 8pF (V F > 50V). Step 3. Calculating total parasitic capacitance using (3) C P = 5pF + 5pF + 3pF + 8pF = 3pf Step 4. Calculating the leading edge spike duration using (4), (5) Conduction power loss: P COND = 0.5 (0mA) 0Ω µA 65V P COND 55mW Total power dissipation in FC99: P TOTAL = 0mW + 55mW = 75mW Step 6. Selecting input capacitor C N Output Power = 4V 0mA = 80mW Select C IN ECQ-E404KF by Panasonic (0.µF, 400V, Metalized Polyester Film). T SPIKE = 65V 3pF + 0ns 00mA 36ns < T BLANK(MIN) Figure. Universal 85-65VAC LED Lamp Driver D D3 C IN L IN C IN C O LED - LED D4 D5 U D AC Line 85-65V VRD F C DD 3 VDD FC99 DRAIN GND L 6/8

7 Figure 3. Typical Efficiency Figure 4. Switch-Off Transition. Ch: V DRAIN, Ch3: I DRAIN Efficiency (%) Input AC Line Voltage (VAC) ZERO VOLTAGE TRANSITION Figure 5. Typical Efficiency Figure 6. Switch-Off Transition. Ch: V DRAIN, Ch3: I DRAIN LEADING EDGE SPIKE SWITCH OFF 5mA Functional Block Diagram GND VDD DRAIN T OFF = 0.5µs Regulator 7.5V REF - + S R Q Q FC99 T BLANK = 300ns R 7/8

8 FC99 Layout Considerations See Figure 7 for a recommended circuit board layout for the FC99. Single Point Grounding capacitor to the area of copper connected to the GND pin. Bypass Capacitor (C DD ) The VDD pin bypass capacitor C DD should be located as near as possible to the VDD and GND pins. Switching Loop Areas capacitor C IN, the diode D and the FC99 together should be kept as small as possible. C O, the inductor L and the diode D together should be kept as small as possible. Thermal Considerations vs. Radiated EMI The copper area where GND pin is connected acts not only as a single point ground, but also as a heat sink. This area should be maximized for good heat sinking, especially when FC99, (SOT-89 package), is used. The same applies to the cathode of the free-wheeling diode D. Both nodes are quiet and therefore, will not cause radiated RF emission. The switching node copper area connected to the DRAIN pin of the FC99, the anode of D and the inductor L needs to be minimized. A large switching node area can increase high frequency radiated EMI. Input Filter Layout Considerations The inp direct proximity to the inductor L in order to avoid magnetic important when unshielded construction of L is used. When is selected, it must be IN positioned orthogonal with respect to L. The loop area formed by C N, L N and C IN should be minimized. The input lead wires must be twisted together. Figure 7. Recommended circuit board layout with the FC99 COMPONENT SIDE VIEW AC Line 85-64VAC F VRD D-5 L IN C N C IN D L C O LED + LED - C DD U Pin Description Pin # Function Description DRAIN Drain terminal of the output switching MOSFET and a linear regulator input. GND Common connection for all circuits. 3 VDD Power supply pin for internal control circuits. Bypass this pin with a 0.uF low impedance capacitor. 8/8

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