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hi-sincerity microelectronics corp. spec. no. : ic200804 issued date : 2008.09.19 revised date : page no. : 1/13 H6849p, H6849s,H6849nf hsmc product specification H6849 series novel low cost green-power pwm controller features z low cost, pwm&pfm&crm z low start-up current (about 10 a) z low operating current (about 2ma) z current mode operation z under voltage lockout (uvlo) z built-in synchronized slope compensation z programmable pwm frequency z leading edge blanking on sense input z constant output power limiting for universal ac input z cycle-by-cycle current limiting z clamped gate output voltage 16.5v z over voltage protect 26.7v z high-voltage cmos process with esd z sot-23-6l sop-8 & dip-8 pb-free packaging z compatible with sg5701 & sg5848 & ld7535 &ob2263/2263 applications z switching ac/dc adaptor z battery charger z open frame switching power supply z 384x replacement general description the H6849 is a highly integrated low cost current mode pwm controller, which is ideal for small power current mode of offline ac-dc fly-back converter applications. making use of external resistors, the ic changes the operating frequency and automatically enter s the pfm/crm under light-load/zero-load cond itions. this can minimize standby power consumption and achieve green-power functions. with a very low start-up current, the H6849 could use a large value start-up resistor (1.5mohm). built-in synchronized slope compensation enhances the stability of the system and avoids sub-harmonic oscillation. dynamic peak limiting circuit minimizes output power change caused by delay ti me of the system over a universal ac input range. leading edge blanking circuit on current sense input could remove the signal glitch due to snubber circuit diode reverse recovery and thus greatly reduc es the external component count and system cost in the design. pulse-by-pulse current limiting ensures safe operation even during short-circuit. the H6849 offers more protection like ovp (over voltage protection) and ocp (over current protection). the H6849?s output driver is clamped to maximum 16.5v to protect the power mosfet. excellent emi performance is achieved soft switching control at the totem pole gate driver output. H6849 is offered in sot-23-6, sop-8 and dip-8 packages.
hi-sincerity microelectronics corp. spec. no. : ic200804 issued date : 2008.09.19 revised date : 2009.07.14 page no. : 2/13 H6849p, H6849s,H6849nf hsmc product specification pin assignment part number description H6849nf sot26, pb-free,in t/r H6849s sop-8, pb-free in t/r H6849p dip-8, pb-free in tube pin connection (top view) package function description sot-26 dip-8 pin6: gate pin1: gate totem-pole output to drive the external power mosfet which is internally clamped below 18v pin5: vdd pin2: vdd power supply the internal protection circuit disables pwm output if vdd is over voltage.. pin3: nc nc pin. pin4: sense pin4: sense current sense pin, a resistor connects to sense the mosfet current. pin3: ri pin5: ri this pin is to program the switching frequency. by connecting a resistor to ground to set the switching frequency. pin6: nc nc pin pin1: fb pin7:fb voltage feedback pin.output current of this pin could controls the pwm duty cycle, if fb voltage exceeds the threshold; the internal protection circuit disables pwm output. 3 1 2 4 6 5 sot-26 1234 5678 dip -8(sop-8) pin1: gnd pin8: gnd gnd pin block diagram simplified internal circuit architecture
hi-sincerity microelectronics corp. spec. no. : ic200804 issued date : 2008.09.19 revised date : 2009.07.14 page no. : 3/13 H6849p, H6849s,H6849nf hsmc product specification absolute maximum ratings symbol parameter rating unit v dd supply voltage pin voltage 40 v i ovp vdd ovp maximal enter current 20 ma v fb input voltage to fb pin -0.3 to 6v v v sen input voltage to sen pin -0.3 to 6v v p d power dissipation 300 mw esd capability, hbm model 2000 v esd capability, machine model 200 v 20 second sot-23-6l 220 t l lead temperature (soldering) 10 second dip-8 260 t stg storage temperature range -55 to + 150 recommended operation condition symbol parameter min ~ max unit vdd vdd supply voltage 12~20 v ri ri pin resistor value 58~120 k ohm t oa operation ambient temperature -20~85 p o output power 0~60 w f pwm frequency of pwm 48~100 khz typical application H6849
hi-sincerity microelectronics corp. spec. no. : ic200804 issued date : 2008.09.19 revised date : 2009.07.14 page no. : 4/13 H6849p, H6849s,H6849nf hsmc product specification electrical characteristics ( ta=25c unless otherwise noted, v dd = 15v. ) symbol parameter conditions min. typ. max. unit supply voltage (v dd pin) i st startup current 10 a v fb =0v 2.8 ma v fb =3v 2.3 ma i ss operating current v fb =open 1.46 ma vdd on turn-on threshold voltage 16.1 v vdd off turn-off threshold voltage 11.1 v vd clamp vdd clamp voltage i vdd =20ma 26.7 v voltage feedback (fb pin) i fb short circuit current v fb =0v 2.8 ma v fb open loop voltage v fb =open 4.8 v i pfm enter pfm, fb current 0.92 ma i crm enter crm, fb current 1.5 ma current sensing (sen pin) v th_l minimum voltage lever 0.83 0.87 v v th_h maximum voltage lever 1.0 1.05 v t pd delay to output 300 ns r cs input impedance 50 k ? oscillator (ri pin) f osc normal frequency ri=100kohm 53 58 63 khz f pfm pfm frequency ri=100kohm 11.6 khz dc max maximum duty cycle ri=100kohm 75 % f temp frequency temp. stability -30-85 5 % t blank leading-edge blanking time 300 ns gate drive output (gate pin) v ol output low level v dd =15v, i o =20ma 1 v v oh output high level v dd =15v, i o =20ma 8 v t r rising time c l =1000pf 450 ns t f falling time c l =1000pf 130 ns vg clamp output clamp voltage vdd=20v 16.5 v
hi-sincerity microelectronics corp. spec. no. : ic200804 issued date : 2008.09.19 revised date : 2009.07.14 page no. : 5/13 H6849p, H6849s,H6849nf hsmc product specification typical characteristics vdd startup current vs temperature duty cycle vs temperature vdd (off) vs temperature vdd startup current vs temperature vdd operation current vs temperature ovp vs temperature
hi-sincerity microelectronics corp. spec. no. : ic200804 issued date : 2008.09.19 revised date : 2009.07.14 page no. : 6/13 H6849p, H6849s,H6849nf hsmc product specification pwm frequency vs temperature f osc vs fb current f osc vs ri pin resistor
hi-sincerity microelectronics corp. spec. no. : ic200804 issued date : 2008.09.19 revised date : 2009.07.14 page no. : 7/13 H6849p, H6849s,H6849nf hsmc product specification operation description current model compared to voltage model control, current model control has a current feedback loop. when the voltage of the sense resistor peak current of the primary winding reaches the internal setting value v th , comparator reverse, register reset and power mosfet cut-off. so that to detect and modulate the peak current cycle by cycle could control t he output of the power supply. the current feedback has a good linear modulation rate and a fast input and output dynamic impact av oid the pole that the output filter induc tance brings and the second class system des cends to first class and so it widens the frequency range and optimizes overload protection and short circuit protection. startup current and under voltage lockout the startup current of H6849 is set to be very low so that a large value startup resistor can therefore be used to minimize the power loss. for ac to dc adaptor with universal input r ange design, a 1.5 m ? , 1/8 w startup resistor and a 10uf/25v vdd hold capacitor could be used . the turn-on and turn-off threshold of the H6849 is designed to 16.1v/11.1v. during startup, the hold-up capacitor must be charge to 16.1v through the startup resistor. the hysteresis is implemented to prevent the shutdown from t he voltage dip during startup. internal bias and osc operation a resistor connected between ri pin and gnd pin set the internal constant current source to charge or discharge the internal fixed cap. the charge time and discharge time determine the internal clock speed and the switching frequency. increasing the resistance will reduce the value of the input current and reduce the switching frequency. the relationship between ri pin and pwm switching frequency follows the below equation within the ri allowed range. )( )( 5800 khz kri f osc = for example, a 100k ? resistor ri could generate a 50ua constant current and a 58khz pwm switching frequency. the suggested operating frequency range of H6849 is within 48khz to 100khz. green power operation the power dissipation of switching mode power supply is very important in zero load or light load condition. the major dissipation result from conduction loss switching loss and consume of t he control circuit. however, all of them related to the switching frequency. there are many difference topologies has been implemented in different chip. the basic operation theory of all these approaches intended to reduce the switching frequency under light-load or no-load condition. H6849`s green power function adapts pwm pfm and crm combining modulation. when ri resistor is 100k, the pwm frequency is 58khz in medium or heavy load operation. through modifying the pulse width, H6849 could c ontrol output voltage. the current of fb pin increases when the load is in light condition and the internal mode controller enters pfm&pwm when the feedback current is over 0.92ma. the operation frequency of oscillator is to descend gradually. the invariable frequency of oscillator is 11.6khz when the feedback current is over 1.05m a. to decrease the standby consumption of the power supply , chip-rail introduces the cycle reset mode technology if the feedback current were over 1.1ma, mode controller of H6849 would reset internal register all the time and cut off the gate pin, while the output voltage is lower than the set value, it would set register, gate pin oper ating again. although the frequency of the internal osc is invariable, the register would reset some pulses so that the practical frequency is decreased at the gate pin.
hi-sincerity microelectronics corp. spec. no. : ic200804 issued date : 2008.09.19 revised date : 2009.07.14 page no. : 8/13 H6849p, H6849s,H6849nf hsmc product specification H6849 green-power function internal synchronized slop compensation although there are more advantages of the current mode control than conventional voltage mode control, there are still several drawbacks of peak-sens ing current-mode converter. especially the open loop instability when it ope rates in higher than 50% of the duty-cycle. H6849 is introduced an internal slope compensation adding voltage ramp to the current sense input voltage for pwm generation to solve this problem. it improves t he close loop stability greatly at ccm, prevents the sub-harmonic oscillation and thus reduces the output ripple voltage. duty duty duty v max slop = = 4389.0 33.0 current sensing & dynamic peak limiting the current flowing by the power mosfet comes in to being a voltage v sense on the sense pin cycle by cycle, which compares to the internal reference voltage, controls the reverse of the internal register, limits the peak current imax of the primary of the transformer. the energy 2 2 1 max ile = deposited by the transformer. so adjusting the r sense can set the max output power of the power supple mode. the current flowing by the power mosfet has an extra value d p in t l v i = due to the system delay t that the current detect ed from the sense pin power mosfet cut off in the H6849 mong these, v in is the primary winding voltage of the transformer and l p is the primary wind inductance. ranges from 85vac to 264vac. to guarantee the output power is a constant for universal input ac voltage, there is a dynam ic peak limit circuit to compensate the system delay t that the system delay brings on. to (a in v leading-edge blanking (leb) each time the power mosfet is switched on, a turn-on spike will inevitably occur at the sense pin, which would disturb the internal signal from the sampling of the r sense . there is a 300n sec leading edge blanking time built in to avoid the effect of the turn -on spike and the power mosfet cannot be switched off during this time. so that the conventional external rc filtering on sense input is no longer required. H6849 over voltage protection (ovp) there is a 26.7v over-voltage protection circuit in the H6849 to improve the credibility and extend the life of the chip. the gate is to shutdown immediately when the voltage
hi-sincerity microelectronics corp. spec. no. : ic200804 issued date : 2008.09.19 revised date : 2009.07.14 page no. : 9/13 H6849p, H6849s,H6849nf hsmc product specification of the vdd is over 26.7v and the voltage of vdd is to descend rapidly. gate driver & soft clamped H6849? output designs a totem pole to drive a periphery power mosfet. the dead time is introduced to minimize the transfixion current when the output is drove. the nmos is shut off when the other nmos is turned on. the clamp technology is introduced to protect the periphery power mosfet from breaking down. package demensions dip-8l dimensions millimeters inches symbol min. typ. max. min. typ. max. a 5.334 0.210 a1 0.381 0.015 a2 3.175 3.302 3.429 0.125 0.130 0.135 b 1.524 0.060 b1 0.457 0.018 d 9.017 9.271 10.160 0.355 0.365 0.400 e 7.620 0.300 e1 6.223 6.350 6.477 0.245 0.250 0.255 e 2.540 0.100 l 2.921 3.302 3.810 0.115 0.130 0.150 eb 8.509 9.017 9.525 0.335 0.355 0.375 ? 0 ? 7 ? 15? 0 ? 7 ? 15?
hi-sincerity microelectronics corp. spec. no. : ic200804 issued date : 2008.09.19 revised date : 2009.07.14 page no. : 10/13 H6849p, H6849s,H6849nf hsmc product specification sot-23-6l dimensions in millimeters dimensions in inches symbol min max min max a 0.700 1.000 0.028 0.039 a1 0.000 0.100 0.000 0.004 b 1.397 1.803 0.055 0.071 b 0.300 0.559 0.012 0.022 c 2.591 3.000 0.102 0.118 d 2.692 3.099 0.106 0.122 e 0.838 1.041 0.033 0.041 h 0.080 0.254 0.003 0.010 l 0.300 0.610 0.012 0.024
hi-sincerity microelectronics corp. spec. no. : ic200804 issued date : 2008.09.19 revised date : 2009.07.14 page no. : 11/13 H6849p, H6849s,H6849nf hsmc product specification sop-8l dimensions disclaimers millimeter inch symbol min. typ. max. min. typ. max. a 1.346 1.752 0.053 0.069 a1 0.101 0.254 0.004 0.010 b 0.406 0.016 c 0.203 0.008 d 4.648 4.978 0.183 0.196 e 3.810 3.987 0.150 0.157 e 1.016 1.270 1.524 0.040 0.050 0.060 f 0.381x45 0.015x45 h 5.791 6.197 0.228 0.244 l 0.406 1.270 0.016 0.050 ? 0 8 0 8
hi-sincerity microelectronics corp. spec. no. : ic200804 issued date : 2008.09.19 revised date : 2009.07.14 page no. : 12/13 H6849p, H6849s,H6849nf hsmc product specification typical applications 12v/2a 24w power supply schematic: bill of material: designator part type footprint number 12v-2a-bom r1,r2 1.2m 5% smd 1206 2 r3,r4 750k 5% smd 1206 2 r5,r6 180k 5% smd 1206 2 r7 10r 5% smd 1206 1 r8 47r 5% smd 0805 1 r9 220r 5% smd 0805 1 r10 10k 5% smd o8o5 1 r11 100k 5% smd o8o5 1 r12,r13,r14 2.2r 5% smd 1206 3 r15 33r 5% smd 1206 1 r16,r17 62r5% smd 1206 2 r18 1.8k5% smd 1206 1 r19 240r5% smd 0805 1 r20 3.9k1% smd 0805 1 r21 1k1% smd 0805 1 r22 56k5% smd 0805 1 r23 4.7k5% smd 0805 1 c1 47uf/400v ec 1 c2 222/1kv cc 1 c3 101/50v smd 0805 1 c4 10uf/50v ec 6x11mm 1 c5 104/50v smd 0805 1 c6 223/50v smd 0805 1 c7 102/500v cc 1 c8,c9 680uf/16v ec 2 c10,c11 104/50v smd 0805 2
hi-sincerity microelectronics corp. spec. no. : ic200804 issued date : 2008.09.19 revised date : 2009.07.14 page no. : 13/13 H6849p, H6849s,H6849nf hsmc product specification u1 H6849 pwm ic sot-23-6 1 u2 pc817c dip-4 1 u3 h431 to-92 1% kc 1 cx1 0.22uf/275v x 1 cy1 222/400v y 1 f1 2a250v 3mm*11mm 1 ntc1 5d-9 ntc pin:6mm 1 mov 7d471 mov pin:5mm 1 l1 uu9.8 min:18mh 0.2mm t16*9*7 1 l2 t9*5*3 l 8uh 1 l3 t3*15 15uh 1 q1 h4n60 4a600v to-220 1 t1 ef25 t lp=1.5mh 3% 1 bd1 kbl206 2a/600v 1 d1 fr107 do-41 1 d2 fr104 do-41 1 d3 1n4148 smd 1 d4 mbr10100 10a100v to-220 1 zd1 15v zd 1w 1 transformer structure and material 1. schematic. n2 n3 n1 vo gnd bais drain b+ sgnd 2. winding configuration 0.052t n3 (bias gnd) d=0.3mm1p 14ts top 0.052t n2 (vo sgnd) d=0.4mm2p 12ts 0.052t e2 (cu line gnd) d=15mm1p1.1ts 0.052t n1 (drain b+) d=0.3mm1p 80ts 0.052t e1 (gnd no) d=0.2mm1p bottom bobbin: l core:ef25 tdk pc40

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