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fp6111 320khz, 2a asynchronous buck regulator this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw general description the fp6111 is a wide input range buck switching regulator suitable for most applications. the fp6111 includes a high current p-mosfet, a high precision reference (0.8v) for comparing output voltage with a feedback amplifier, an internal soft start timer and dead-time controller. the oscillator controls both the maximum duty cycle and pwm frequency. features ? precision feedback reference voltage: 0.8v (2%) ? wide supply voltage operating range: 3.6 to 20v ? low current consumption: 3ma ? internal fixed oscillator frequency: 320khz (typ.) ? internal soft-sta rt function (ss) ? built-in p-mosfet for 2a output loading ? over current protection ? package: sop-8l typical application circuit rev. 0.6 1/15
fp6111 this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw function block diagram oscillator internal soft-start en thermal protection gnd gnd reference regulator over current protection output driver control enable control 0.8v fb lx lx 2.5v error amplifier comp pin descriptions sop-8l name no. i / o description fb 1 i error amplifier inverting input comp 2 o error amplifier output for compensation en 3 i enable control v cc 4 p ic power supply (pmos source) lx 5 o pmos high current output lx 6 o pmos high current output gnd 7 p ic ground gnd 8 p ic ground fp6111 9fa-86l rev. 0.6 2/15
fp6111 this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw rev. 0.6 3/15 ic date code identification halogen free lot number mass production version per-half month year fp6111 halogen free : halogen free product indicator lot numbe r : wafer lot number?s last two digits for example: 132386tb ? 86 mass production version : mass production mask version per-half month : production period indicated in half month time unit for example: january a (front half month), b (last half month) february c (front half month), d (last half month) y ear : production year?s last digit
fp6111 this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw rev. 0.6 4/15 ordering information part number operating temperature package moq description fp6111d-g1 -25c ~ +85c sop-8l 100 ea tube FP6111DR-G1 -25c ~ +85c sop-8l 2500 ea tape & reel absolute maximum ratings parameter symbol conditions min. typ. max. unit power supply voltage v cc 25 v output source current 2.2 a error amplifier inverting input -0.3 1.2 v allowable power dissipation p d sop-8l t a +25 Q c 650 mw junction to ambient thermal resistance ja +175 c / w junction to case thermal resistance jc +45 c / w operating temperature -25 +85 c hbm (human body mode) 2 kv esd susceptibility mm (machine mode) 200 v storage temperature t s sop-8l -55 +125 c sop-8l lead temperature (soldering, 10 sec) +260 c suggested ir re-flow soldering curve
fp6111 this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw rev. 0.6 5/15 recommended operating conditions parameter symbol conditions min. typ. max. unit supply voltage v cc 3.6 20 v operating temperature -25 85 c dc electrical characteristics (v cc =6v, t a = 25c, unless otherwise noted) parameter symbol conditions min. typ. max. unit reference feedback voltage v ref 0.784 0.8 0.816 v input regulation v ref / v ref v cc =3.6 to 20 v 2 12.5 mv t a = -25 to +25 c 1 2 % feedback voltage change with temperature v ref / v ref t a = 25 to +85 c 1 2 % oscillator section oscillation frequency f 0.4v < v comp < 0.7v 320 khz short circuit or over current oscillation frequency f sc v comp <0.4v 30 khz frequency change with voltage f / v v cc =3.6v to 25v 5 % frequency change with temperature f / t t a = -25 to +85 c 5 % idle period adjustment section maximum duty cycle t duty v fb =0.2v 80 % output section pmos source current i d -2 a pmos d-s voltage v dss v comp =0.1v -30 v output leakage current i l 5 a v cc =5.0v, v fb =0v 70 150 m pmos on resistance r ds (on) v cc =10v, v fb =0v 42 90 m thermal shutdown section thermal shutdown temperature +150 c over current protection section pmos ocp current i ocp v cc =12v 4 a total device section en pin input current i en v en = gnd 20 a en pin on threshold v upper en pin upper 1.12 v en pin off threshold v low en pin low 0.87 v en pin hysteresis v hys 210 250 mv supply shutdown current i sd v en =0v 2 10 a supply average current i ave 4 6 ma
fp6111 this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw rev. 0.6 6/15 parameter symbol conditions min. typ. max. unit error amplifier section input bias current l b -1.0 a voltage gain av 100 v / v frequency bandwidth bw av=0 db 6 mh z output voltage swing positive v pos 1.7 2 v output voltage swing negative v neg 0.1 0.2 v output source current i source v comp =800mv -15 -30 a output sink current i sink v comp =800mv 15 30 a
fp6111 this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw typical operating characteristics (v in =12v, v out =3.3v, i out =2a, t a = 25 c , unless otherwise noted) load regulation v in =12v 3.35 3.37 3.39 3.41 3.43 3.45 3.47 3.49 3.51 3.53 3.55 00.511.5 i out (a) v out (v) oscillator frequency vs. v in v out =3.3v i out =200ma 340 342 344 346 348 350 352 354 356 358 360 0 5 10 15 20 v in (v) oscillator frequency(khz ) 2 line regulation i out =200ma 3.418 3.42 3.422 3.424 3.426 3.428 3.43 3.432 3.434 3.436 3.438 0 5 10 15 20 v in (v) v out (v) current limit vs. v in 3 3.2 3.4 3.6 3.8 4 4.2 4.4 4.6 4.8 5 0 5 10 15 20 v in (v) current limit (a) supply current vs. temperature 3.2 3.22 3.24 3.26 3.28 3.3 3.32 3.34 3.36 3.38 3.4 -40 -20 0 20 40 60 80 100 temperature ( ) supply current (ma) supply current vs. v in 3.2 3.25 3.3 3.35 3.4 3.45 3.5 0 5 10 15 20 v in (v) supply current (ma) efficiecncy (v in =12v,l=22uh) 50 60 70 80 90 00.511.5 i out (a) efficiency (%) current limit vs. temperature 2.5 3 3.5 4 4.5 5 5.5 6 -40 -20 0 20 40 60 80 100 temperature ( ) current limit (a) 2 vout=3.3v vout=5v rev. 0.6 7/15
fp6111 this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw output ripple t ransient response (i out =0.1a to 2a) ch1: lx, ch2: v out ch3: v out , ch4: i lx en on test power on test ch1: en, ch2: lx, ch3: v out , ch4: i lx ch1: v in , ch2: lx, ch3: v out , ch4: i lx rev. 0.6 8/15
fp6111 this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw function description voltage reference a 2.5v reference regulator suppl ies fp6111 internal circuits and uses a resistive divider to provide 0.8v precision reference voltage on t he non-inverting terminal of error amplifier. error amplifier the error amplifier compares a sample of t he dc-dc converter output voltage to the 0.8v (v ref) reference and generates an error signal for the pwm comparator. output voltage of the dc-dc converter is setting by the resistor divider with following expression (see figure 1) ref 1 2 out v r r 1v ? ? ? ? ? ? ? ? ? ?? 1 2 0.8v 36k 500 v out t r2 r1 c1 fp6111 error amplifier figure 1 error amplifier with feedback resistance divider the recommended resistor value is summarized below: v out (v ) r 1 (k ) r 2 (k ) 1.8 2.4k 3k 2.5 3.2k 6.8k 3.3 1.5k 4.7k 5 2k 10.5k rev. 0.6 9/15
fp6111 this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw rev. 0.6 10/15 oscillator the fixed frequency is generated by an internal rc oscillator. its typical value is 320khz in normal operation and 30khz in short circuit condition. thermal protection when a heavy loading draws current from the regulat or, the chip temperature will rise. once the junction temperature exceeds 150 , fp6111 thermal protection function will be triggered and the lx output will be turned off. when junction temperature is lower, fp6111 starts again and enable lx pin output. over current protection the fp6111 uses cycle-by-cycle current limit to pr otect the internal power switch. during each switching cycle, a current limit comparator detects if the power switch current exceeds the internal setting current. once over current occurs, the oscillator fr equency will decrease to prevent the driver from burning out.
fp6111 this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw application information input capacitor selection the input capacitor must be connected between the v cc and gnd pin of the fp6111 to maintain steady input voltage and filter out the pulsing input cu rrent. the voltage rating of input capacitor must be greater than maximum input voltage plus ripple voltage. in switch mode, the input current is discontinuous in a buck converter. the source current of the high-side mosfet is a square wave. to prevent large voltage transient s, a low esr input capacitor sized for the maximum rms current must be used. the rms value of input capacitor current can be calculated by: ? ? ? ? ? ? ? ? ? ? ? in o in o o rms v v 1 v v ii max it can be seen that when v o is half of v in , c in is under the worst current stress. the worst current stress on c in is i o_max / 2. inductor selection the value of the inductor is selected based on the maximum tolerant ripple current. large inductance gives low inductor rippl e current and small inductance result in high ripple current. however, the larger value inductor usually has a larger physical size, higher series resistance, and lower saturation current. on the experience, the value is to allow the peak-to-peak ripple current in the inductor to be 10%~20% maximum load current. the inductance value can be calculated by: ?? in o o oin in o l oin v v i%)20~%10(2f )vv( v v if )vv( l ?? ? ? ?? ? ? the inductor ripple current can be calculated by: ? ? ? ? ? ? ? ? ?? ? ?? in o o l v v 1 lf v i choose an inductor that does not saturate u nder the worst-case load conditions, which is the load current plus half the peak-to-peak inductor ripple current even at the highest operating temperature. the peak inductor current is: 2 i ii l o peak_l ? ?? rev. 0.6 11/15
fp6111 this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw the inductors in different shape and style are available from manufacturers. shielded inductors are small and radiate less emi issue. but they cost more than unshielded inductors. the choice depends on emi requirement, price and size . inductor value ( h) dimensions(mm) component supplier model 10 10.310.34.0 feng-jui tprh10d40-10r 10 10.110.13.0 sumida cdrh104r 15 10.310.34.0 feng-jui tprh10d40-15r output capacitor selection the output capacitor is required to maintain the dc output voltage. low esr capacitors are preferred to keep the output voltage ripple low. in a buck converter circuit, output ripple voltage is determined by inductor value, switching frequency, output capacitor value and esr. the output ripple is determined by: ? ? ? ? ? ? ? ? ?? ? ???? out c lo cf8 1 esriv out where f = operating frequency, c out = output capacitance and i l = ripple current in the inductor. for a fixed output voltage, t he output ripple is highest at maximum input voltage since i l increases with input voltage. using ceramic input and output capacitors care must be taken when ceramic capacitors are used at the input and the output. when a ceramic capacitor is used at the input and the power is supplied by a wall adapter through long wires, a load step at the output can induce ringing at the input, v in . in best condition, this ringing can couple to the output and be mistaken as loop instability. in wo rst condition, a sudden inrush of current through the long wires can potentially generate a voltage spike at v in , which may large enough to damage the part. when choosing the input and output ceramic ca pacitors, choose the one with x5r or x7r dielectric formulations. these dielectrics have the best temperature and voltage characteristics of all the ceramics for a given value and size. pc board layout checklist 1. the power traces, consisting of the gnd, sw and v in traces, should be kept short, direct and wide . 2. place c in near v cc pin as closely as possible to maintain input voltage steady and filter out the pulsing input current. rev. 0.6 12/15
fp6111 this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw 3. the resistive divider r 1 and r 2 must be connected to fb pin dire ctly and as closely as possible. 4. fb is a sensitive node. please keep it away from switching node sw. a good approach is to route the feedback trace on another layer and have a ground pla ne between the top and feedback trace routing layer. this reduces emi radiation on to the dc-dc converters own voltage feedback trace. 5. keep the gnd plates of c in and c out as close as possible. then connect this to the ground plane (if one is used) with several vias. this reduces ground plane noise by preventing the switching currents from circulating through the ground plane. it also reduces ground bounce at the fp6111 gnd pin by giving it a low impedance ground connection. suggested layout rev. 0.6 13/15
fp6111 this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw typical application fp6111 basic dc-dc regulator circuit for example: the v in power supply is 12v and the v out is designed for 5.0v / 2a solution. the output voltage formula is: v0.5v8.0 k2 0.5k1 1v r r 1v ref 1 2 out ?? ? ? ? ? ? ? ? ? ??? ? ? ? ? ? ? ? ? ?? rev. 0.6 14/15
fp6111 this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw package outline sop-8l symbols min. (mm) max. (mm) a 1.346 1.752 a1 0.101 0.254 a2 1.092 1.498 d 4.800 4.978 e 3.810 3.987 h 5.791 6.197 l 0.406 1.270 0 8 note: 1. package dimensions are in complian ce with jedec outline: ms-012 aa. 2. dimension ?d? does not include molding flash, protrusions or gate burrs. 3. dimension ?e? does not include inter-lead flash, or protrusions. rev. 0.6 15/15

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