vishay siliconix sip2800, sip2801, sip2802, sip2803, sip2804, sip2805 document number: 72660 s11-0598-rev. e, 25-apr-11 www.vishay.com 1 this datasheet is subject to change without notice. the product described herein and this document are subject to specific disclaimers, set forth at www.vishay.com/doc?91000 low power consumption current mode controller features ? pin-for-pin compatible with ucc280x controllers ? enhanced performance uc284x for new designs ? 100 a typical start-up current ? 500 a typical operating current ? internal soft start at power-on and after fault ? 100 ns internal leading edge blanking ? compliant to rohs directive 2002/95/ec applications ? efficiency-enhanced dc/dc converter modules ? low quiescent current standby power supplies ? offline (ac/dc) power supplies ? universal input power supplies ? buck, boost, and buck-boost converters description the sip280x family includes six high-speed, low power consumption, bicmos current mode controllers. these integrated circuits contain all of the control and drive functions required for off-line and dc/dc current-mode switching power supplies. their advanced architecture enables the implementation of full-featured designs with minimal external parts count. the sip280x family controllers is available in lead (pb)-free, so-8 packages, and are rated for operation over the industrial temperature range of - 40 c to 85 c. part number maximum duty cycle reference voltage turn-on threshold turn-off threshold sip2800 100 % 5 v 7.2 v 6.9 v sip2801 50 % 5 v 9.4 v 7.4 v sip2802 100 % 5 v 12.5 v 8.3 v sip2803 100 % 4 v 4.1 v 3.6 v sip2804 50 % 5 v 12.5 v 8.3 v sip2805 50 % 4 v 4.1 v 3.6 v typical application circuit * pb containing terminations are not rohs compliant, exemptions may apply. v cc ref gnd rc out + 48 v gnd comp fb cs sip2801 12 v/3 a + + + flyback converter for point of load application
www.vishay.com 2 document number: 72660 s11-0598-rev. e, 25-apr-11 vishay siliconix sip2800, sip2801, sip2802, sip2803, sip2804, sip2805 this datasheet is subject to change without notice. the product described herein and this document are subject to specific disclaimers, set forth at www.vishay.com/doc?91000 notes: a. currents are positive into, negative out of the specificed terminal. b. in normal operation v cc is powered through a current li miting resistor. an absolute maximum of 12 v applies when v cc is driven from a low impedance source such that i cc does not exceed 30 ma. stresses beyond those listed under ?absolute maximum ratings? ma y cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other condit ions 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. absolute maximum ratings a parameter limit unit v cc b 12 v fb, comp, cs - 0.3 to 6 power dissipation so-8 1w power dissipation tssop-8 830 mw storage temperature - 55 to 150 c recommended operating range parameter limit unit operating temperature range - 40 to 85 c specifications parameter symbol test conditions unless specified v cc = 10 v, r t = 100 k ? ., c t = 330 pf c ref = 0.1 f, - 40 c < t a < 85 c limits unit min. a typ. b max. a reference reference voltage v ref i load = 0.2 ma, t a = 25 c sip2800 / sip2801 / sip2802 / sip2804 4.925 5.000 5.075 v sip2803 / sip2805 3.940 4.000 4.06 sip2800 / sip2801 / sip2802 / sip2804 4.88 5.00 5.10 sip2803 / sip2805 3.90 4.00 4.08 load regulation ? v load 0.2 ma < i load < 5 ma 10 30 mv line regulation ? v line v cc = 10 v to clamp, t a = 25 c 1.9 mv/v v cc = 10 v to clamp 2.5 noise v noise 10 hz < f < 10 khz, t a = 25 c 130 v short circuit current i sc - 5 - 35 ma oscillator frequency f osc sip2800 / sip2801 / sip2802 / sip2804 40 46 52 khz sip2803 / sip2805 26 31 36 temperature stability 2.5 % amplitude v p-p 2.25 2.40 2.55 v peak voltage v p 2.45
document number: 72660 s11-0598-rev. e, 25-apr-11 www.vishay.com 3 vishay siliconix sip2800, sip2801, sip2802, sip2803, sip2804, sip2805 this datasheet is subject to change without notice. the product described herein and this document are subject to specific disclaimers, set forth at www.vishay.com/doc?91000 parameter symbol test conditions unless specified v cc = 10 v, r t = 100 k ? ., c t = 330 pf c ref = 0.1 f, - 40 c < t a < 85 c limits unit min. a typ. b max. a error amplifier input voltage v in comp = 2.5 v sip2800 / sip2801 / sip2802 / sip2804 2.44 2.50 2.56 v comp = 2.0 v sip2803 / sip2805 1.95 2.00 2.05 input bias current i bias1 - 1 1 a open loop gain a v 60 80 db comp sink current i sink fb = 2.7 v, comp = 1.1 v 0.3 3.5 ma comp source current i source fb = 1.8 v, comp = v ref - 1.2 v - 0.2 - 0.5 - 0.8 gain bandwidth b w 2mhz specifications specifications parameter symbol test conditions unless specified v cc = 10 v, r t = 100 k ? ., c t = 330 pf c ref = 0.1 f, - 40 c < t a < 85 c limits unit min. a typ. b max. a pwm and overcurrent comparator maximum duty cycle d max sip2800 / sip2802 / sip2803 97 99 100 % sip2801 / sip2804 / sip2805 48 49 50 minimum duty cycle d min comp = 0 v 0 gain c a v 0 < v cs < 0.8 v 1.2 1.65 1.9 v/v max. input signal v imax comp = 5 v 0.9 1.0 1.1 v input bias current 2 i bias2 - 200 200 na comp to cs offset cs = 0 v 0.45 0.90 1.35 v cs pin blanking time 50 100 150 ns overcurrent comparator fault threshold 1.47 1.73 output output voltage v ol i = 20 ma all parts 0.1 0.40 v i = 200 ma 0.35 0.90 i = 50 ma, v cc = 5 v sip2803 / sip2805 0.15 0.40 i = 20 ma, v cc = 0 v all parts 0.70 1.20 v cc - v oh i = - 20 ma all parts 0.15 0.40 i = - 200 ma 1.00 1.90 i = - 50 ma, v cc = 5 v sip2803 / sip2805 0.40 0.90 rise time t r cl = 1 nf 41 70 ns fall time t f 44 75
www.vishay.com 4 document number: 72660 s11-0598-rev. e, 25-apr-11 vishay siliconix sip2800, sip2801, sip2802, sip2803, sip2804, sip2805 this datasheet is subject to change without notice. the product described herein and this document are subject to specific disclaimers, set forth at www.vishay.com/doc?91000 notes: a. the algebraic convention whereby the most negative value is a minimum and the most po sitive a maximum (- 40 c to 85 c). b. typical values are for design aid only, not guaranteed nor subject to pr oduction testing and are measured at v cc = 12 v unless otherwise noted. c. gain is defined by a = dvcomp/dvcs, 0 v ? vcs ? 0.8 v. d. start, stop, and zener voltages track each other. parameter symbol test conditions unless specified v cc = 10 v, r t = 100 k ? ., c t = 330 pf c ref = 0.1 f, - 40 c < t a < 85 c limits unit min. a typ. b max. a undervoltage lockout start threshold d v start sip2800 6.6 7.2 7.8 v sip2801 8.6 9.4 10.2 sip2802 / sip2804 11.5 12.5 13.5 sip2803 / sip2805 3.7 4.1 4.5 stop threshold d v stop sip2800 6.3 6.9 7.5 sip2801 6.8 7.4 8.0 sip2802 / sip2804 7.6 8.3 9.0 sip2803 / sip2805 3.2 3.6 4.0 start to stop hysteresis v hys sip2800 0.05 0.30 0.48 sip2801 1.5 2.0 2.4 sip2802 / sip2804 3.0 4.2 5.1 sip2803 / sip2805 0.2 0.5 0.8 soft-start comp rise time ? ss fb = 1.8 v, rise from 0.5 v to v ref - 1 v 410ms overall start-up current i start v cc < start threshold 0.1 0.2 ma operating supply current i cc fb = 0 v, cs = 0 v 0.5 1.0 v cc internal zener voltage d v z i cc = 10 ma 12.0 13.5 15.0 v v cc internal zener voltage minus start threshold voltage d v z - v start sip2802 / sip28004 0.5 1.0 specifications
document number: 72660 s11-0598-rev. e, 25-apr-11 www.vishay.com 5 vishay siliconix sip2800, sip2801, sip2802, sip2803, sip2804, sip2805 this datasheet is subject to change without notice. the product described herein and this document are subject to specific disclaimers, set forth at www.vishay.com/doc?91000 typical characteristics sip2800 / sip2801 / sip2802 / sip2804 oscillator frequency vs. r t and c t oscillator dead time vs. c t r t (k ) oscillator fr equency (khz) c t = 100 pf 1000 100 10 10 100 1000 c t = 200 pf c t = 330 pf c t = 1000 pf 0 50 100 150 200 250 300 350 400 450 500 100 200 300 400 500 600 700 800 900 1000 r t = 100 k c t (pf) dead time (ns) sip2803/05 sip2800/01/02/04 sip2803 / sip2805 oscillator frequency vs. r t and c t comp to cs offset voltage vs. temperature r t (k ) oscillator fr equency (khz) 1000 100 10 10 100 1000 c t = 100 pf c t = 200 pf c t = 330 pf c t = 1000 pf 0.7 0.8 0.9 1.0 1.1 1.2 1.3 - 50 - 25 0 25 50 75 100 125 150 cs = 0 v temperature ( c) comp to cs offset (v) error amplifier gain and phase vs. frequency 1 - 3 0 80 10 10000 frequency (khz) gain (db) 100 70 60 50 40 30 20 10 0 - 1 0 - 2 0 1000 135 45 0 -45 90 phase ( ) phase gain
www.vishay.com 6 document number: 72660 s11-0598-rev. e, 25-apr-11 vishay siliconix sip2800, sip2801, sip2802, sip2803, sip2804, sip2805 this datasheet is subject to change without notice. the product described herein and this document are subject to specific disclaimers, set forth at www.vishay.com/doc?91000 pin configuration additional voltage options are available. detailed pin description comp comp is the output of the voltage error amplifier (vea). the vea is a low output impedance operational amplifier, providing the input to the pwm cycle-by-cycle current limit comparator. as the sip280x series of parts use a true operational amplifie r for the vea, the co mp terminal can both source and sink current. to add flexibility to these parts, the vea is internally current lim ited, which allows out to be forced to zero duty cycle by taking the comp pin to gnd. the voltage on comp is passed through an internal diode to develop an offset voltage of approximately 0.6 v, and then through a resistive divider wit h a gain of 0.606 v/v, before being presented to the control input of the cycle-by-cycle current limit comparator. clamping the comp pin to less than the diode?s forward voltage (i.e., < 0.5 v) will command the current loop to deliver 0 a, by holding the control input of the cycle-by-cycle current comparator at 0 v. similarly, the current loop will command the maximum inductor current on each cycle when comp is at 2.25 v or greater, which drives the control input of the cycle-by -cycle current comparator to 1 v (since [2.25 v - 0.6 v] x 0.606 v/v = 1 v). the sip280x series additionally features a built-in soft-start function, which functions by clamping the output level of the vea to an internally generated voltage. this clamp will hold comp at a low voltage (v comp ?? 0 v) until v cc and v ref are at their proper levels. when these levels are appropriate for circuit operation, the internal voltage will begin rising, at the rate of 1 v/ms. this rising clamp level allows the voltage on the comp pin to rise, which in turn allows the voltage at the control input of the cycle-by -cycle current comparator to increase. the maximum soft-s tart interval occurs under conditions requiring full duty cycle (50 % or 100 %, depending upon the part type), and is given by the time required for the voltage on the cycle-by-cycle current comparator?s control input to reach 1 v. since 1 v at the control input to the comparator requires that the comp pin be at 2.25 v, the maximum soft-start interval is approximately 2.25 ms. cs input to both the cycle-by-cycl e and overcurrent fault current sense comparators. the cycle-by-cycle current limit comparator is the mechani sm by which the vea?s output voltage commands the level of inductor or transformer current during a given "on" interval, thereby regulating the overall circuit?s output.this comparator forms the inner loop of the two loops used in current-mode regulation. the overcurrent comparator has a trip threshold that is 50 % higher than that of the cycle-by-cycle comparator. under normal operating conditions, this comparator will not trip: its purpose is to provide enhanced protection of the power path components during severe faults (e .g., a short circuit). if the overcurrent comparator is trippe d by a fault condition, it will command the sip280x to do a "full-cycle restart". during this restart, the power supply will be quickly driven to the "off" state, and will be required to wait for five milliseconds (typical) before restarting. when the supply does restart, it will do so using the built-in soft-start function of the sip280x. 5 comp ref fb v cc cs out rc gnd soic-8 6 7 8 2 3 4 1 to p v i e w ordering information soic-8 part number lead (pb)-free part number marking temperature sip2800dy-t1 sip2800dy-t1-e3 2800 - 40 c to 85 c sip2801dy-t1 sip2801dy-t1-e3 2801 sip2802dy-t1 sip2802dy-t1-e3 2802 sip2803dy-t1 sip2803dy-t1-e3 2803 sip2804dy-t1 SIP2804DY-T1-E3 2804 sip2805dy-t1 sip2805dy-t1-e3 2805 pin description pin number name function 1 comp output of the voltage error amplifier, and the inverting input to the pwm?s current sense comparator 2 fb inverting input of the voltage error amplifier 3cs non-inverting input of the pwm current sense compar ator, and inverting input of the overcurrent fault comparator (both comparators are f ed from the output of the internal 100 ns leading edge blanking circuit) 4 rc connection for the pwm oscillator? s timing resistor and timing capacitor 5 gnd ground pin 6 out pwm output signal (capable of driving 750 ma into the gate of an external mosfet power switch) 7 v cc positive supply voltage for the ic 8 ref ic reference voltage
document number: 72660 s11-0598-rev. e, 25-apr-11 www.vishay.com 7 vishay siliconix sip2800, sip2801, sip2802, sip2803, sip2804, sip2805 this datasheet is subject to change without notice. the product described herein and this document are subject to specific disclaimers, set forth at www.vishay.com/doc?91000 the sip280x family incorporates internal leading-edge blanking on the cs pin, to keep any spurious voltages on the cs pin from reaching the comparator inputs during the 100 ns interval immediately following the rising edge on out (for example, voltages due to capacitive charging currents). because of this internal leading-edge blanking, many applications require no exter nal rc filter on the cs input. compared to circuits requiring the use of an external rc filter circuit, leading-edge blanking provides a shorter effective cs to out propagation delay. fb fb is the inverti ng input of the vea. internally compared against v ref /2 appearing on the vea?s non-inverting input. to avoid stability problems, keep lead lengths to fb as short as possible, and use good layout practices to minimize the stray capacitances of compon ents connected to this pin. gnd the gnd pin is both the re ference ground and the power ground for this part. out out is the output of a high-cu rrent driver capable of peak currents in excess of 750 ma . out is therefore well suited to driving the gates of pow er mosfets. this pin is specifically held low when v cc is below the sip280x?s uvlo threshold, to ensure a predictable system turn-on. since the out pin is internally connected to a low impedance cmos buffer, it is capable of rapid rail-to-rail transitions. this output topology also mitigates th e effects of undershoot and overshoot. for this reason, external schottky clamp diodes are generally not required on this pin. rc rc is the oscillator frequency programming pin. f osc is set by the combination of r t and c t . the charging current for c t is provided through r t , which is normally connected between ref and the sip280x rc pin. c t then connects from rc to gnd. due to th e high impedances encountered in low power control circuits, this connection must be a short and quiet return to gnd (preferably by means of a dedicated signal trace, separated from all other circuit functions). the oscillator frequency for t he sip280x family of parts is approximated by the following formulas: for the sip2800, sip2801, sip2802, and sip2804: ?f osc ? (1.5)/r t c t for the sip2803 and sip2805: ?f osc ? (1.0)/r t c t here r t is in ohms and c t is in farads. more accurate formulas for f osc are: for the sip2800, sip2801, sip2802 and sip2804: ?f osc = 1/{[(c t + c stray ) x r t x 0.652] + [(c t + c stray ) x r disch x 2.53] + t delay } for the sip2803 and sip2805: ?f osc = 1/{[(c t + c stray ) x r t x 0.93] + [(c t + c stray ) x r disch x 2.53] + t delay } here r t is in ohms and c t is in farads, r disch is the value of the resistor through which c t is discharged (normally an on-chip 130 ? resistor, unless the circuit is configured with additional external discharge-path resistance), and t delay is an inherent internal comparat or delay time of 100 ns. the capacitance associated with the rc pin is approximately 7.5 pf, and should be included as a part of c stray . note that the sip2801, sip2804, and sip2805 have an internal toggle flip-flop at th e output of the oscillator, to ensure that the output duty cycl e never exceeds 50 %. this divides the frequency appeari ng at the out pin to one-half of the oscillator frequency for these three parts. values of r t below 10 k ? are not recommended. low values of r t cause high circuit operating currents, and very low values will prevent the oscillator from properly discharging c t . ref the reference generator block of the si280x provides an accurate and stable 4.0 v or 5.0 v (depending upon part number), which is available at this pin of the ic. this voltage is also used internally for other functions on the ic. one of these uses is as the logic power supply for high speed switching logic on the ic; this, and stability concerns, make it important to bypass v ref to gnd with a good quality 0.1 f ceramic capacitor, as close to the part as possible. an electrolytic or tantalum capacit or may be used in addition to the ceramic capacitor. when 1 v < v cc < the uvlo threshold, ref is pulled to ground through a 5 k ? resistor. hence, ref can also be used as an output to indicate the part?s v cc status. v cc v cc is the positive power connection for the sip280x controller ic, and should be the most positive terminal on the part. in normal operation, v cc is powered through a current limiting resistor. the required start-up supply current will generally be on the order of 100 a with v cc below the uvlo voltage of the sip280x, and can remain at or below 500 a total supply current once the part starts switching. to prevent the ic from being damaged by overvoltage conditions, each of the sip2800 family of parts has an internal clamp (effectively a 13.5 v zener diode) between v cc and gnd. if the part?s v cc pin is current-fed through an appropriate dropping resistor, the v cc pin will never exceed its rated voltage, nor will t he device as a whole exceed its rated power dissipation. this does require knowing what the operating current of the ic will be, so that the value of the dropping resistor can be calculated. a good estimate of the actual operating current (i cc ) may be made by summing three components: (a) any external current loading on the v cc or ref pins (b) the operating current required by the ic itself, and (c) the drive current (i drive ) required by the external power switch.
www.vishay.com 8 document number: 72660 s11-0598-rev. e, 25-apr-11 vishay siliconix sip2800, sip2801, sip2802, sip2803, sip2804, sip2805 this datasheet is subject to change without notice. the product described herein and this document are subject to specific disclaimers, set forth at www.vishay.com/doc?91000 item (a) in the above list is a static dc value, and can generally be calculated with good accuracy. item (b) will increase with operating frequency, but will be fixed for a given value of f osc . item (c) is usually the dominant term in the calculation of i cc , as the power required to drive the external power switch will typically increase as f out is increased. the most common ex ample of this is seen in driving the gate of a power mosfet. in such applications, the gate capacitances must be charged once each switching cycle. this calculation is simp lified by using the gate charge term given by most mosfet manufacturers, allowing the use of the formula: i drive = f out x q g of the chosen mosfet. a first approximation of the necessary dropping resistor value is then given by: r = [(nominal v supply ) - 12 v]/(nominal i cc ) here r is in ohms and i cc is in amperes. the resistor limiting the current into the v cc pin should be selected such that i cc(min) equals the worst-case maximum sum of the above currents, while holding i cc(max) to as low a value above that number as pr acticable (for best overall efficiency), and nevermore than 25 ma above that number (to avoid exceeding the ic?s internal clamp diode ratings). v cc must be bypassed to gnd with a good quality 0.1 f ceramic capacitor, as close to the part as possible. this will help avoid problems created by high-frequency noise on the power supply of the part. an electrolytic or tantalum capacitor may be placed in parallel with the ceramic capacitor if more capacitance is needed or desired. functional block diagram vishay siliconix maintains worldwide manufacturing capability. products may be manufactured at one of several qualified locatio ns. reliability data for silicon tech- nology and package reliability represent a com posite of all qualified locations. for related documents such as package/tape dra wings, part marking, and reliability data, see www.vishay.com/ppg?72660 . cs out rc comp v cc fb gnd tq sq r osc leading edge blanking reference voltage uvlo soft-start ref sip2801/4/5 only 1.5 v ref/2 overcurrent comparator - + + - voltage error amplifier pwm comparator 13.5 v - +
vishay siliconix package information document number: 71192 11-sep-06 www.vishay.com 1 dim millimeters inches min max min max a 1.35 1.75 0.053 0.069 a 1 0.10 0.20 0.004 0.008 b 0.35 0.51 0.014 0.020 c 0.19 0.25 0.0075 0.010 d 4.80 5.00 0.189 0.196 e 3.80 4.00 0.150 0.157 e 1.27 bsc 0.050 bsc h 5.80 6.20 0.228 0.244 h 0.25 0.50 0.010 0.020 l 0.50 0.93 0.020 0.037 q0808 s 0.44 0.64 0.018 0.026 ecn: c-06527-rev. i, 11-sep-06 dwg: 5498 4 3 1 2 5 6 8 7 h e h x 45 c all le a d s q 0.101 mm 0.004" l ba 1 a e d 0.25 mm (g a ge pl a ne) s oic (narrow): 8-lead jedec p a rt n u m b er: m s -012 s
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