supertex inc. supertex inc. www.supertex.com cl8801 doc.# dsfp-cl8801d031914 features ? minimal component count (base conig: cl8801 + 4 resistors + diode bridge) ? no magnetics, no capacitors ? up to 7.5w output (13w w/ heat sink) ? >110lm/w using eficient leds ? 85% electrical eficiency ? >0.95 power factor ? <30% thd line current ? low conducted emi w/o ilters ? 85% led luminous utilization ? phase dimmer compatible with an rc network applications ? fluorescent tube retroit ? incandescent & cfl bulb replacement ? general led lighting general description the cl8801 is designed to drive a long string of inexpensive, low current leds directly from the ac mains. a basic driver circuit consists of the cl8801, four resistors, and a bridge rectiier. two to four additional components are optional for various levels of transient protection. no capacitors, emi ilters, or power factor correction circuits are needed. a string of series/parallel leds is tapped at four locations. four linear current regulators sink current at each tap and are sequentially turned on and off, tracking the input sine wave voltage. voltage across each regulator is minimized when conducting, providing high eficiency. output current at each tap is individually resistor-adjustable. cross- regulation, as the cl8801 switches from one regulator to the next, provides smooth transitions. the current waveform can be tailored to optimize for input voltage range, line/load regulation, output power/current, eficiency, power factor, thd, dimmer compatibility, and led utilization. with the addition of an rc network, the driver is compatible with phase dimming. typical application circuit sequential linear led driver biasgnd cl8801 set1 set2 set3 set4 ac mains tap1 tap2 tap3 tap4 transient protection downloaded from: http:///
2 cl8801 supertex inc. www.supertex.com doc.# dsfp-cl8801d031914 absolute maximum ratings parameter value v bias , v tap1 C0.5v to +550v v tap2C4 C0.5v to +320v v set1C4 4.0v operating junction temperature -55oc to +125oc storage temperature, t s -65c to +150c absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these conditions is not implied. continuous operation of the device at the absolute rating level may affect device reliability. all voltages are referenced to device ground. pin coniguration product marking ordering information part number package options packing CL8801K63-G 33-lead (6x6) qfn 490/tray CL8801K63-G m935 33-lead (6x6) qfn 2000/reel 33-lead qfn 8801llllll yyw w aaacc c l = lot number yy = year sealed ww = week sealed a = assembler id c = country of origin = ?green? packaging 33-lead qfn (top view) 1 33 set1 nc set2 nc set3 ncnc nc set4 nc bias tap1 tap2 nc tap3 nc tap4 gn d gndgnd gnd gnd gnd gnd gnd gnd gndgnd gnd gnd gnd gnd gnd gnd recommended operating conditions sym parameter min typ max units conditions i out output current tap1 - - 60 ma --- tap2 - - 90 tap3 - - 200 tap4 - - 200 v out output voltage tap1 - - 400 v non-conducting tap2-4 - - 300 non-conducting tap1-4 - - (1) conducting v bias applied bias voltage - - 440 v --- note: (1) voltage capability is determined by power dissipation (v i). -g denotes a lead (pb)-free / rohs compliant package esd sensitive device typical thermal resistance package ja 1 jc 2 33-lead qfn 24 o c/w 2.5 o c/w notes: 1. 1.0oz cu 4-layer board, 3x4 pcb with thermal pad and thermal via array. 2. junction to exposed heat slug. downloaded from: http:///
3 cl8801 supertex inc. www.supertex.com doc.# dsfp-cl8801d031914 sym parameter min typ max units conditions i bias bias pin input current - 250 410 a v bias = 170v i tap(on) output current, on tap1 60 - - ma v tap1 = 30v, v set1~4 = gnd tap2 90 - - v tap2 = 17v, v set1~4 = gnd tap3 200 - - v tap3 = 17v, v set1~4 = gnd tap4 200 - - v tap4 = 17v, v set1~4 = gnd i tap(off) output current, off - 0 10 a tap1 - 3, v bias = 170v v reg regulation voltage at set pins set1 - 3 1.80 2.00 2.20 v --- set4 1.89 2.10 2.31 electrical characteristics (over recommended operating conditions at 25c unless speciied otherwise) output current thermal characteristics 400350 300 250 200 150 100 50 0 i out (ma) -60 -40 -20 0 20 40 60 80 100 120 140 temperature (c) maximum output current ta ps 3&4 ta p 2 ta p 1 simpliied block diagram r set1 r set2 r set3 r set4 biasgnd cl8801 set1 set2 set3 set4 ac mains tap1 tap2 tap3 tap4 120v transient protection in re g 1 0 1 01 0 downloaded from: http:///
4 cl8801 supertex inc. www.supertex.com doc.# dsfp-cl8801d031914 overview designing a driver to meet particular requirements may be a dificult task considering the number of design variables (16): tap current (4), number of series-connected leds per segment (4), and the number of parallel-connected leds per segment (4). manually selecting values will provide light, but the chosen values may be far from optimal in regards to eficiency, led utilization, line regulation, etc. contact your nearest supertex field applications engineer for design assistance. mathcad and excel worksheets are available by contacting apps@supertex.com . i n addition to coniguring the driver, several circuits may be employed to increase reliability, performance, and cost. the following sections briely describe these circuits. transient protection since the driver circuits have no need for capacitors that could otherwise absorb transient energy, nor is there a need for emi ilters that would block transients, the full burden of transient protection is borne by the protection circuit. the two-stage approach in the following schematics provide 2.5kv protection, both pulse and ring per en 61000-4-5 and en 61000-4-12, six hits each. 100 to 120vac transient protection 230vac transient protection zener substitution zeners may be substituted for leds in the bottom stages. the last 1 or 2 stages contribute little to light output - they are mainly to off-load the adjacent upstream regulator at high line voltages to minimize losses. zener substitution advantages include minimizing unlit leds at low line for better light uniformity, better line regulation at high line, fewer leds for lower cost and less pcb area, and fewer board-to-board connections. disadvantages include slight - ly reduced eficiency at high line, and additional heat load on the driver board. phase dimming as with any light load, the led lamp might not draw enough current to assure proper dimmer operation. this is especially true for 230vac dimmers. triacs used in dim - mers require a minimum latching current when triggered to place the triac in the latched-on state. once latched, a minimum holding current is required to maintain the triac in the on state. latching current is many times greater than the holding current, and is the main concern with dimmer compatibility. higher latching current can be provided by a simple series rc network across the ac line. a short time constant pro - vides a current spike at the turn-on edge. less common is inadequate holding current. the minimum dimmer holding current is typically 10-20ma. tap1 at 60ma (max) exceeds the minimum. flicker twice per ac line cycle the line voltage crosses zero volts, during which time there is no light output. the circuit below can provide 5-10% valley ill. it has little effect on input current waveshape (thd, pf) and eficiency. power boost higher output power can be achieved by off-loading a por - tion of the power dissipation from the cl8801 to exter - nal fets. the circuit below drops most of the tap voltage across the fets, thereby shifting the bulk of the dissipation to the fet. 22 150vac 10mm a c line 22 33 275vac 10mm 440vdc 1.5kw a c line bridge rectifier ac line transient protection 500 100 - 200nf tap2 tap3 to leds to leds 200k 15v downloaded from: http:///
5 cl8801 supertex inc. www.supertex.com doc.# dsfp-cl8801d031914 bias cl8800 gnd tap1 tap2 tap3 tap4 c f1 q f2 dn3135 r f3 r f2 150k r f1 10k q f1 optional flicker reduction circuit (valley fill) r s1 r s2 r s3 r s4 valley fill circuit downloaded from: http:///
6 cl8801 supertex inc. www.supertex.com doc.# dsfp-cl8801d031914 pin description pin # pin name description 1 - 8 gnd circuit common (use for heat sink ground plane pass through). 9 set1 current sense for linear current regulators for each tap. resistors on these pins sets the tap currents. 10 nc no internal connection. 11 set2 current sense for linear current regulators for each tap. resistors on these pins sets the tap currents. 12 nc no internal connection. 13 set3 current sense for linear current regulators for each tap. resistors on these pins sets the tap currents. 14 nc no internal connection. 15 nc no internal connection. 16 nc no internal connection. 17 set4 current sense for linear current regulators for each tap. resistors on these pins sets the tap currents. 18 nc no internal connection. 19 - 20 gnd circuit common (use for heat sink ground plane pass through). 21 gnd circuit common. connect to bridge rectiier return (use for heat sink ground plane pass through) . 22 - 26 gnd circuit common (use for heat sink ground plane pass through). 27 tap4 current regulator outputs. connect to taps along the led string. 28 nc no internal connection. 29 tap3 current regulator outputs. connect to taps along the led string. 30 nc no internal connection. 31 tap2 current regulator outputs. connect to taps along the led string. 32 tap1 current regulator outputs. connect to taps along the led string. 33 bias provides bias for driver. connect to rectiied ac. underside plate (gnd) for heatsinking purposes, it should be soldered to a 4.0cm 2 exposed copper area. it should also be electrically connected to circuit common (gnd). note: the high voltage pins are located on one side of the package and are arranged from lowest voltage to highest. pin-to-pin voltage gradients are mini- mized. downloaded from: http:///
supertex inc. does not recommend the use of its products in life support applications, and will not knowingly sell them for use in such applications unless it receives an adequate ?product liability indemnification insurance agreement.? supertex inc . does not assume responsibility for use of devices described, and limits its liabilit y to the replacement of the devices determined defective due to workmanship. no responsibility is assumed for possible omissions and inaccuracies. circuitry and specifications are subject to change without notice. for the latest product specifications refer to the supertex inc . (website: http//www .supertex.com) ?2014 supertex inc. all rights reserved. unauthorized use or reproduction is prohibited. supertex inc. 1235 bordeaux drive, sunnyvale, ca 94089 t el: 408-222-8888 www.supertex.co m 7 (the package drawings in this data sheet may not relect the most current speciications. for the latest package outline information go to http://www.supertex.com/packaging.html .) cl8801 doc.# dsfp-cl8801d031914 33-lead qfn package outline (k6) 6.00x6.00mm body, 1.00mm height (max), 0.50mm pitch notes: 1. a pin 1 identiier must be located in the index area indicated. the pin 1 identiier can be: a molded mark/identiier; an embedded metal marker; or a printed indicator. 2. depending on the method of manufacturing, a maximum of 0.15mm pullback (l1) may be present. 3. the inner tip of the lead may be either rounded or square. 4. there will be an exposed dap. a minimum of 0.7mm spacing will be maintained between the leads and the dap. seating plane top vi ew side view bottom view d e e2 view b vi ew b 1 note 3 note 2 note 1 (index area d/2 x e/2) 33 1 33 d2 0.70mm (min) note 4 e b l1 l a a1 a3 note 1 (index are a d/2 x e/2) symbol a a1 a3 b d d2 e e2 e l l1 o dimension (mm) min 0.80 0.00 0.20 ref 0.18 5.85 4.00 5.85 3.60 0.50 bsc 0.30 0.00 0 nom 0.90 0.02 0.25 6.00 4.15 6.00 3.75 0.40 - - max 1.00 0.05 0.30 6.15 4.25 6.15 3.85 0.50 0.15 14 drawings not to scale.supertex doc. #: dspd-33qfnk636x6p050, version a021312. downloaded from: http:///
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