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www.irf.com ? 2011 international rectifier feb 21, 2011 IR1152S fixed 66khz frequency, pfc one cycle control pfc ic with brown-out protection features description package ir1152 application diagram vout rtn acin1 acin2 com 1 bop 4 vfb 6 vcc 7 gate 8 isns 3 comp 2 ovp/en 5 ir1152 -+ vcc + ? pfc ic with ir proprietary ?one cycle control? ? continuous conduction mode boost type pfc ? fixed 66khz switching frequency ? average current mode control ? input line sensed brownout protection ? output overvoltage protection ? open loop protection ? cycle by cycle peak current limit ? vcc under voltage lockout ? programmable soft start ? micropower startup ? user initiated micropower ?sleep mode? ? 750ma peak gate drive ? latch immunity and esd protection pfc ir1152 power factor correction ic, based on ir proprietary "one cycle control" (occ) technique, prov ides for high pf and excellent dc bus regulation while enabling drastic reduction in component count, pcb area and design time as compared to traditional solutions. the ic is designed to operate in 85-264vac universal input, continuous conduction mode boost pfc at fixed 66khz switching frequency. ir1152 features include input-line sensed brown-out protection, overvoltage protection, cycle by cycle peak current limit, open loop protection, v cc uvlo, soft-start and micropow er startup current of less than 75a. in addition, for standby power requirements, the ic can be driven into a micropower sleep mode by pulling the ovp/en pin low where the current consumption is less than 75ua. the ir1152 is available in so-8 packages. http:///
IR1152S www.irf.com 2 ? 2011 international rectifier qualification information industrial qualification level comments: this family of ics has passed jedec?s industrial qualification. ir?s consumer qualific ation level is granted by extension of the higher industrial level. moisture sensitivity level msl2 260c (per ipc/jedec j-std-020) machine model class a (per jedec standard jesd22-a115) esd human body model class 1a (per eia/jedec stand ard eia/jesd22-a114) ic latch-up test class i, level a (per jesd78) rohs compliant yes absolute maximum ratings stresses beyond those listed under ?absolute maximu m ratings? may cause permanent damage to the device. these are stress ratings only and functional operation of the device at these conditions is not implied. all voltages are absolute voltages referenc ed to com. thermal resistance and power dissipation are measured under board mounted and still air conditions. parameters symbol min. max. units remarks v cc voltage v cc -0.3 20 v not internally clamped isns voltage v isns -10 0.3 v isns current i isns -2 2 ma v fb voltage v fb -0.3 6.5 v v ovp voltage v ovp -0.3 6.5 v v bop voltage v bop -0.3 9 v comp voltage v comp -0.3 6.5 v gate voltage v gate -0.3 18 v junction temperature operating range t j -40 150 c storage temperature t s -55 150 c thermal resistance r ja 128 c/w package power dissipation p d 976 mw t amb =25c http:///
IR1152S www.irf.com 3 ? 2011 international rectifier electrical characteristics the electrical characteristics involve the spread of va lues guaranteed within the specified supply voltage and junction temperature range t j from ? 25 c to 125c. typical values represent the median values, which are related to 25c. if not otherwise stated, a supply voltage of v cc =15v is assumed for test condition supply section parameters symbol min. typ. max. units remarks supply voltage operating range v cc 14 17 v v cc turn on threshold v cc on 12.2 13.1 14 v v cc turn off threshold (under voltage lock out) v cc uvlo 9.4 10.1 10.8 v v cc turn on/off hysteresis v cc hyst 2.4 3 3.6 v 9 ma c load =1nf 14 ma c load =4.7nf operating current i cc 3.5 5 ma stand-by mode ? inactive gate start-up current i cc start 26 75 a v cc =v cc on - 0.5v sleep current i sleep 26 75 a pin ovp/en=0.4v sleep mode threshold v sleep 0.55 0.8 v bias on ovp/en pin oscillator section parameters symbol min. typ. max. units remarks 58 66 72.5 t amb =25 c fixed oscillator frequency f sw 53.8 73 khz -25 c < t amb < 125 c maximum duty cycle d max 93 99 % v comp =5v minimum duty cycle d min 0 % pulse skipping protection section parameters symbol min. typ. max. units remarks open loop protection (olp)threshold v olp 17 19 21 % v ref bias on vfb pin output overvoltage protection (ovp) threshold v ovp 104 106 108 % v ref bias on vfb and/or ovp/en pins output overvoltage protection reset threshold v ovp(rst) 101 103 105 % v ref bias on vfb and/or ovp/en pins ovp input bias current i ovp(bias) -0.2 a brown-out protection (bop) threshold v bop 0.68 0.78 0.88 v bias on bop pin brown-out protection enable threshold v bop(en) 1.46 1.56 1.66 v bias on bop pin bop input bias current i bop(bias) -0.2 a peak current limit protection isns voltage threshold (ipk limit) v isns(pk) -0.82 -0.75 -0.68 v bias on isns pin http:///
IR1152S www.irf.com 4 ? 2011 international rectifier internal voltage reference section parameters symbol min. typ. max. units remarks reference voltage v ref 4.9 5 5.1 v regulation voltage on vfb pin, t amb =25c line regulation r reg 10 20 mv 14v < v cc < 17v temp stability t stab 0.4 % -25c < t amb < 125c total variation v tot 4.85 5.1 v line & temperature voltage error amplifier section parameters symbol min. typ. max. units remarks transconductance g m 35 49 59 s 30 44 58 t amb =25c source current (normal mode) i ovea(src) 17 80 a -25c < t amb < 125c -58 -44 -30 t amb =25c sink current (normal mode) i ovea(snk) -80 -17 a -25c < t amb < 125c soft start delay time (calculated) t ss 60 msec r gain =1.1k , c zero =0.56 f, c pole =10nf v comp voltage (fault) v comp flt 1 1.4 v @100ua steady state effective v comp voltage v comp eff 4.7 4.9 5.1 v vfb input bias current i fb(bias) -0.2 a v fb =4.9v output low voltage v ol 0.25 v output high voltage v oh 5 5.4 v v comp start voltage v comp start 260 375 485 mv http:///
IR1152S www.irf.com 5 ? 2011 international rectifier current amplifier section parameters symbol min. typ. max. units remarks dc gain g dc 2.65 3.1 3.55 v/v corner frequency f c 5 khz average current mode, note 1 input offset voltage v io 4 16 mv note 1 isns input bias current i isns(bias) -57 -13 a v fb =0v, v isns =-1v blanking time t blank 170 320 470 ns gate driver section parameters symbol min. typ. max. units remarks gate low voltage v glo 0.8 v i gate = 200ma 12 13 14 v cc =17v, internally clamped gate high voltage v gth 10 v v cc =11.5v 25 ns c load = 1nf, vcc=15v rise time t r 60 ns c load = 4.7nf, vcc=15v 35 ns c load = 1nf, vcc=15v fall time t f 65 ns c load = 4.7nf, vcc=15v output peak current i opk 750 ma c load = 4.7nf, vcc=15v, note 1 gate voltage at fault v g fault 0.08 v i gate = 20ma note 1: guaranteed by design, but not tested in production http:///
IR1152S www.irf.com 6 ? 2011 international rectifier block diagram v ref vfb comp v comp discharge v olp open loop comparator q s r isns g dc v isns com vcc gate v bias v bias v bias v bias v bias v bop(en) v bop v bias v isns(pk) + - bop vbias ovp/en v sleep sleep (power off) vbias bop integrated ramp + oscillator v bias olp v comp start brown out comparator vbias voltage error amplifier enable comparator current amplifier v ovp v ovp(rst) ovp (ovp) vbias ovp (vfb) v m v m 0 ovp (ovp) comparator ovp (vfb) comparator ovp (ovp) ovp (vfb) uvlo block bias & internal references uvlo (power off) max duty cycle limit stand-by ipk limit comparator v ovp v ovp(rst) uvlo/sleep f c http:///
IR1152S www.irf.com 7 ? 2011 international rectifier lead assignments & definitions pin symbol description 1 com ground 2 comp voltage loop compensation 3 isns current sense 4 bop brown-out fault detect 5 ovp/en overvoltage fault detect/enable 6 vfb output voltage sense 7 vcc ic supply voltage 8 gate gate drive output ir1145 ovp/en com bop i sns v cc gate comp v fb ir1152 http:///
IR1152S www.irf.com 8 ? 2011 international rectifier ir1152 general description the pfc ir1152 ic is intended for power factor correction in continuous conduction mode boost pfc converters operating at fixed switching frequency with average current mode cont rol. the ic operates based on ir's proprietary "one cycle control" (occ) pfc algorithm based on the concept of resettable integrator. theory of operation the occ algorithm based on the resettable integrator concept works using two loops - a slow outer voltage loop and a fast inner current loop. the outer voltage loop monitors the vfb pin and generates an error signal which controls the amplitude of the input current admitted into the pfc converter. in this way, the outer voltage loop maintains output voltage regulation. the voltage loop bandwidth is kept low eno ugh to not track the 2xf ac ripple in the output voltage and thus generates an almost dc error signal under steady state conditions. the inner current loop maintains the sinusoidal profile of the input current and thus is responsible for power factor correction. this loop exploits the fact that, in a power factor corrected system, by definition, the information about the sinusoidal variation in input voltage is inherently availabl e in the input line current (or boost inductor current). thus there is no need to sense the input voltage to generate a current reference. the current loop employs the boost inductor current information to generate pwm signals with a proportional sinusoidal variation. this controls the shape of the input current to be proportional to and in phase with the input voltage. average current mode operation is envisaged by filtering the switching frequency ripple from the current sense signal using an appropriately sized on-chip rc filter. this filter also contributes to the bandwidth of the current control loop. thus the filter bandwidth has to be high enough to track the 120hz rectified, sinusoidal current waveform and also filter out the switching frequency ripple in the inductor current. in ir1152 this averaging function can e ffectively filter high ripple current ratios (as high as 40% at maximum input current) to accommodate designs with small boost inductances. the ic determines the boost converter instantaneous duty cycle based on the resettable integrator concept. the required signals are the voltage feedback loop error signal v m (which is the v comp pin voltage minus a dc offset of v comp,start ) and the current sense signal v isns . the resettable integrator generates a cycle-by-cycle, saw-tooth signal called the pwm ramp which has an amplitude v m and period 1/f sw hence a slope of v m* f sw . the current sense signal is amplified by the current amplifier by a factor g dc and fed into the summing node where it is subtracted from v m to generate the summer voltage (= v m ?g dc *v isns ). the summer voltage is compared with the pwm ramp by the pwm comparator of the ic to determine the gate drive duty cycle. the instantaneous duty is mathematically given by: d = (v m - g dc .v isns )/v m assuming steady state cond itions where the voltage feedback loop is well regulated (v m & v out are dc signals) & hence instantaneous duty cycle follows the boost-converter equation (d = 1 ? v in (t)/v out ), the control equation can be re-written as: v m = g dc .v isns /(v in (t)/v out ) further, recognizing that v isns = i l (t).r sns and re- arranging yields: g dc .i l (t).r sns = v m v in (t)/v out since v m , v out & g dc are constant terms: i l (t) v in (t) thus the inductor current follows the input voltage waveform & by definition power factor correction is achieved. feature set fixed frequency operation the ic is programmed to operate at a fixed frequency of 66khz (typ). internalization of the oscillator offers excellent noise immunity even in the noisy pfc environment while integration of the oscillator into the occ core of the ic eliminates need for digital calibration circuits. both these factors render the gate drive jitter free thus contributing to elimination of audible noise in pfc magnetics. ic supply circuit & low start-up current the ir1152 uvlo circuit maintains the ic in uvlo mode during start-up if vcc pin voltage is less than the vcc turn-on threshold, v cc,on and current consumption is less than 75ua. should vcc pin voltage should drop below v cc,uvlo during normal operation, the ic is pushed back into uvlo mode and vcc pin has to exceed v cc,on again for normal operation. there is no internal voltage clamping of the vcc pin. user initiated micropower sleep mode the ic can be actively pushed into a micropower sleep mode where current consumption is less than 75ua by pulling ovp/en pin below the sleep threshold, v sleep even while vcc is above v cc,on . this allows the user to disable pfc during application stand-by situations in order to meet stand-by regulations. since v sleep is less than 1v, even logic level signals can be employed. http:///
IR1152S www.irf.com 9 ? 2011 international rectifier ir1152 general description programmable soft start the soft start process controls the rate of rise of the voltage feedback loop error si gnal thus providing a linear increase of the rms input current that the pfc converter will admit. the soft start time is essentially controlled by voltage error amplifier compensation components selected and is therefore user programmable to some degree based on desired voltage feedback loop crossover frequency. gate drive capability the gate drive output stage of the ic is a totem pole driver with 750ma peak current drive capability. the gate drive is internally clamped at 13v (typ). gate drive buffer circuits can be easily driven with the gate pin of the ic to suit any system power level. system protection features ir1152 protection features include brown-out protection (bop), open-loop protection (olp), overvoltage protection (ovp), cycle-by-cycle peak current limit (ipk limit), soft-current limit and vcc under voltage lock-out (uvlo). - bop is based on direct input line sensing using a resistor divider/rc filter network. if bop pin falls below the brown-out protection threshold v bop , a brown-out situation is immediately detected and the following response is executed - the gate drive pulse is disabled, vcomp is actively discharged and ic is pushed into stand-by mode. the ic re- enters normal operation only after bop pin exceeds v bop(en) . during start-up the ic is held in stand-by mode until this pin exceeds v bop(en) . - olp is activated whenever the vfb pin voltage falls below v olp threshold. once open loop is detected the following response is immediately executed - the gate drive is immediately disabled, vcomp is actively discharged and the ic is pushed into stand-by mode. there is no voltage hysteresis associated with this feature. during start-up the ic is held in stand-by mode until vfb exceeds v olp . - ovp feature in ir1152 is "dual" and "dedicated". there are 2 overvoltage comparators in ir1152 - marked ovp(ovp) and o vp(vfb) in the block diagram. both these are identical in design, reference the exact same thresholds and thus identical in operation. the non-inverting input of ovp(vfb) comparator is on the vfb pin while that of the ovp(ovp) comparator is on the ovp/en pin. when either or both of the pin voltages exceeds v ovp , an overvoltage situation is detec ted and the gate drive is immediately terminated. the gate drive is re-enabled only after both pin voltages are below v ovp(rst) . the redundancy offered by the 2 comparators and use of a dedicated ovp/en pin ensures the best possible system overvoltage protection against extremes of situations such as component failures, pin-to-pin shorts etc. - soft-current limit is an output voltage fold-back type protection feature encountered when the pfc converter input current exce eds to a point where the v m voltage saturates. as mentioned earlier, the amplitude of input current is directly proportional to v m , the error voltage of the feedback loop. v m is clamped to a certain maximum voltage inside the ic (given by v comp,eff parameter in datasheet). if the input current causes the v m voltage to saturate at its maximum value, then any further increase in input current will cause the duty cycle to droop which immediately forces the v out voltage of the pfc converter to fold-back. since the highest current is at the peak of the ac sinusoid, the droop in duty cycle commences at the peak of the ac sinusoid when the soft-current limit is encountered. in most converters, the design of the current s ense resistor is performed based on soft-current limit (i.e. v m saturation) and at the system condition which demands highest input current (minimum v ac & maximum p out ). - cycle-by-cycle peak cu rrent limit protection instantaneously turns-off the gate output whenever the isns pin voltage exceeds v isns(pk) threshold in magnitude. the gate drive is held in the low state as long as the overcurrent condition persists. the gate drive is re-enabled when the magnitude of isns pin voltage falls below the v isns(pk) threshold. this protection feature incorporates a leading edge blanking circuit to improve noise immunity. http:///
IR1152S www.irf.com 10 ? 2011 international rectifier ir1152 pin description pin com: this is ground potential pin of the ic. all internal devices are re ferenced to this point. pin comp: external circuitry from this pin to ground compensates the system voltage loop and programs the soft start time. the comp pin is essentially the output of t he voltage error amplifier. the voltage loop error signal v m used in the control algorithm is derived from v comp (v m =v comp ? v comp,start ). v comp is actively discharged using an internal resistance to below v comp,start threshold whenever the ic is pushed into stand-by mode (bop or olp condition) or uvlo/sleep mode. the gate drive output and logic functions of the ic are inactive if vcomp is less than v comp,start . also during start-up, the vcomp voltage has to be less than v comp,start in order to commence operation (i.e. a pre-bias on vcomp will not allow ic to commence operation). pin isns: isns pin is tied to the input of the current sense amplifier of the ic. the voltage at this pin, which provides the current sense information to the ic, has to be a negative voltage wrt the com pin. also since the ic is based on average current mode, the entire inductor current information is necessary. a current sense resistor, located below system ground along the return path to the bridge rectifier, is the preferred current sensing method. isns pin is also the inverting input to the cycle-by-cycle peak current limit comparator. whenever v isns exceeds v isns(pk) threshold in magnitude, the gate drive is instantaneously disabled. any external filter ing of the isns pin must be performed carefully in order to ensure that the integrity of the current sense signal is maintained for cycle-by-cycle peak current limit protection. pin bop (brown-out protection): this pin is used to sense the rectified ac input line voltage through a resistor divider/capacitor network which is in effect a voltage division and averaging network, representing a scaled down signal of the average rectified input voltage (average dc voltage + 2xf ac ripple). during start-up the bop pin voltage has to exceed v bop(en) in order to enable the ic to exit stand-by mode and enter normal operation. a brown-out situation is detected whenever the pin voltage falls below v bop and the ic is pushed into stand-by mode. subsequently the pin has to exceed v bop(en) for the ic to exit stand-by and resume normal operation. pin ovp/en: the ovp/en pin is connected to the non-inverting input of the ovp(ovp) overvoltage comparator shown in the block diagram and thus is used to detect output overvoltage situations. the output voltage information is communicated to the ovp pin using a resistive divider. this pin also serves the second purpose of an enable pin. the ovp/en pin can be used to activate the ic into ?micropower sleep? mode by pulling the voltage on this pin below the vsleep threshold. the ovp/en pin can be used to activate the ic into ?micropower sleep? mode by pulling the voltage on this pin below the v sleep threshold. pin vfb: the converter output voltage is sensed via a resistive divider and fed into this pin. vfb pin is the inverting input of the output voltage error amplifier. the non-inverting input of this amplifier is connected to an internal 5v reference. the impedance of the divider string must be low enough that it does not introduce substantial error due to the input bias currents of the amplifier, yet high enough to minimize power dissipation. typical value of external divider impedance will be 2m ? . the vfb pin is also connected to the non-inverting input of the ovp(vfb) overvoltage comparator as shown in the block diagram and is used to detect output overvoltage situations. finally, vfb pin is also the inverting input to the open loop comparator. the ic is held in stand-by mode whenever vfb pin voltage is below volp threshold. ic current consumption is a few ma in this mode. pin vcc: this is the supply voltage pin of the ic and sense node for the undervoltage lock out circuit. it is possible to turn off the ic by pulling this pin below the minimum turn off threshold voltage, vcc(uvlo) without damage to the ic. this pin is not internally clamped. pin gate: this is the gate drive output of the ic. this drive voltage is internally clamped to 13v(typ) and provides a drive current of 0.75a peak with matched rise and fall times. http:///
IR1152S www.irf.com 11 ? 2011 international rectifier ir1152 modes of operation referenced to states & transition diagram uvlo/sleep mode: the ic is in the uvlo/sleep mode when vcc pin voltage is below v cc,on at start-up or when vcc pin voltage drops below v cc,uvlo during normal operation or when ovp/en pin voltage is below v sleep . the uvlo/sleep mode is accessible from any other state of operation. this mode can be actively invoked by pulling the ovp/en pin below v sleep even if vcc pin voltage is above v cc,on . in the uvlo/sleep state, the gate drive circuit is inactive, most of the internal circuitry is unbiased and the ic draws a quiescent current of i sleep which is less than 75ua. also, the internal logic of the ic ensures that whenever the sleep mode is actively invoked, the comp pin is actively discharged below v comp,start threshold prior to entering the sleep mode, in order to facilitate soft-start upon resumption of operation. stand-by mode: the ic is placed in stand-by mode whenever an open-loop and/or a brown-out situation is detected. a brown-out situation is sensed when bop pin voltage is less than v bop(en) prior to system start-up and when bop pin voltage drops below v bop after start-up. an open-loop situation is sensed anytime vfb pin voltage is less than v olp . all internal circuitry is biased in the stand-by mode, but the gate is inactive and the ic draws a few ma of current. this state is accessible from any other state of operation of the ic. comp pin is actively discharged to below v comp,start whenever this state is entered from normal operation in order to facilitate soft-start upon re sumption of operation. soft start mode: during system start-up, the soft- start mode is activated once the vcc voltage has exceeded v cc,on , the vfb pin voltage has exceeded v olp and bop pin voltage has exceeded v bop(en) and vcomp voltage is less than v comp,start i.e. a pre-bias on comp pin greater than v comp,start threshold will not allow ic to commence operation. the soft start time is the time required for the vcomp voltage to charge through its entire dynamic range i.e. through v comp,eff . as a result, the soft-start time is dependent upon the component values selected for compensation of the voltage loop on the comp pin. to an extent, keeping in mind the voltage feedback loop considerations, the soft- system start time is programmable. as vcomp voltage rises gradually, the ic allows a higher and higher rms current into the pfc converter. this controlled increase of the input current amplitude contributes to reducing system component stress during start-up. normal mode: the ic enters the normal operating mode once the soft start transition has been completed (for all practical purposes there is essentially no difference between the soft-start and normal modes). at this point the gate drive is switching and all protection functions of the ic are active. if, from the norma l mode, the ic is pushed into either a stand-by mode or uvlo/sleep mode then comp pin is actively discharged below v comp,start and system will go through soft-start upon resumption of operation. ovp mode: the ic enters ovp mode whenever an overvoltage condition is detected. a system overvoltage condition is recognized when vfb and/or ovp/en pin voltage exceeds v ovp threshold. when this happens the ic immediately disables the gate drive and holds it in that state. the gate drive is re-enabled only when both ovp/en and vfb pin voltages are less than v ovp(rst) threshold. this state is accessible from both the soft start and normal modes of operation. ipk limit mode: the ic enters ipk limit mode whenever the magnitude of isns pin voltage exceeds the v isns(pk) threshold triggering cycle-by- cycle peak over-current protection. when this happens, the ic immediately disables the gate drive and holds it in that state. gate drive is re- enabled when magnitude of isns pin voltage drops below v isns(pk) threshold. this state is accessible from both the soft start and normal modes of operation. http:///
IR1152S www.irf.com 12 ? 2011 international rectifier state & transitions diagram ac power on gate inactive internal circuits unbiased uvlo/sleep mode gate inactive internal circuits biased vcomp discharged stand ? by mode gate inactive internal circuits biased vcomp discharged soft start gate active oscillator active c z charging v comp rising v fb < v olp or v bop < v bop (vth) normal gate active oscillator active v fb < v olp or v bop < v bop (vth) ovp fault present pulseterminated gate inactive oscillator active ipk limit fault present pulseterminated gate inactive oscillator active v cc > v ccon and v ovp > v sleep v fb > v olp and v bop > v bop(en) and v comp < v comp,start cz fully charged v ovp > v ovp (vth) or v fb > v ovp (vth) v ovp < v ovp(rst) and v fb < v ovp(rst) v cc < v cc uvlo or v ovp < v sleep v cc < v cc uvlo or v ovp < v sleep |v isns | > |v isns(pk) | |v isns | < |v isns(pk) | v bop < v bop (vth) v cc < v cc uvlo or v ovp < v sleep v cc < v cc uvlo or v ovp |v isns(pk) | |v isns | < |v isns(pk) | http:///
IR1152S www.irf.com 13 ? 2011 international rectifier ir1152 timing diagrams v cc(on) v cc(uvlo) normal uvlo uvlo vcc undervoltage lockout voltage on vcc pin v cc(on) v cc(uvlo) normal uvlo uvlo vcc undervoltage lockout voltage on vcc pin voltage on vfb pin brown-out protection 1.56v normal 0.76v stand-by stand-by http:///
IR1152S www.irf.com 14 ? 2011 international rectifier 0.01 0.1 1 10 7.0 v 9.0 v 11.0 v 13.0 v 15.0 v 17.0 v i supply (ma) supply voltage figure 1: supply current vs. supply voltage 9.5 v 10.0 v 10.5 v 11.0 v 11.5 v 12.0 v 12.5 v 13.0 v 13.5 v -50 c 0 c 50 c 100 c 150 c vcc uvlo thresholds temperature vcc uv+ vcc uv- figure 2: undervoltage lockout vs. temperature 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 -50 c 0 c 50 c 100 c 150 c i qcc quiescent current (ma) te m p e r a t u r e i cc @ gate inactive figure 3: icc current vs. temperature 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 -50 c 0 c 50 c 100 c 150 c current (ua) temperature i ccstart and i sleep isleep iccstart figure 4: startup current and sleep current vs. temperature http:///
IR1152S www.irf.com 15 ? 2011 international rectifier 63.5 64.0 64.5 65.0 65.5 66.0 66.5 67.0 67.5 68.0 68.5 -50 c 0 c 50 c 100 c 150 c switching frequency (khz) temperature vcomp=5v vcomp=1v figure 5: switchi ng frequency vs. temperature 4.95 4.97 4.99 5.01 5.03 5.05 -50 c 0 c 50 c 100 c 150 c reference voltage (v) temperature figure 6: reference voltage vs. temperature 40.0 42.0 44.0 46.0 48.0 50.0 52.0 54.0 -50 c 0 c 50 c 100 c 150 c ea transconductance g m (us) temperature figure 7: voltage error amplifier transconductance vs. temperature 10.6 20.6 30.6 40.6 50.6 60.6 70.6 80.6 -50 c 0 c 50 c 100 c 150 c error amplifier source/sink current (ua) temperature source |sink| figure 8: voltage error amplifier source & sink current vs. temperature http:///
IR1152S www.irf.com 16 ? 2011 international rectifier 2.90 2.95 3.00 3.05 3.10 3.15 3.20 -50 c 0 c 50 c 100 c 150 c current sense amplifier dc gain g dc (v/v) temperature figure 9: current amplifier dc gain vs. temperature -0.90 -0.85 -0.80 -0.75 -0.70 -0.65 -0.60 -50 c 0 c 50 c 100 c 150 c peak current limit threshold (v) temperature figure 10: peak current limit threshold v isns(pk) vs. temperature 1.00 1.02 1.04 1.06 1.08 1.10 -50 c 0 c 50 c 100 c 150 c ovp threshold (%vref) temperature vovp vovp(rst) figure 11: over vo ltage protection thresholds vs. temperature 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 -50 c 0 c 50 c 100 c 150 c bop threshold (v) temperature vbop(en) vbop figure 12: brown-out protection thresholds vs. temperature http:///
IR1152S www.irf.com 17 ? 2011 international rectifier package details: soic8n http:///
IR1152S www.irf.com 18 ? 2011 international rectifier tape and reel details: soic8n e f a c d g a b h n ote : controlling dimension in mm loaded tape feed direction a h f e g d b c carrier tape dimension for 8soicn code min max min max a 7.90 8.10 0.311 0.318 b 3.90 4.10 0.153 0.161 c 11.70 12.30 0.46 0.484 d 5.45 5.55 0.214 0.218 e 6.30 6.50 0.248 0.255 f 5.10 5.30 0.200 0.208 g 1.50 n/a 0.059 n/a h 1.50 1.60 0.059 0.062 metric imperial reel dimensions for 8soicn code min max min max a 329.60 330.25 12.976 13.001 b 20.95 21.45 0.824 0.844 c 12.80 13.20 0.503 0.519 d 1.95 2.45 0.767 0.096 e 98.00 102.00 3.858 4.015 f n/a 18.40 n/a 0.724 g 14.50 17.10 0.570 0.673 h 12.40 14.40 0.488 0.566 metric imperial http:///
IR1152S www.irf.com 19 ? 2011 international rectifier part marking information http:///
IR1152S www.irf.com 20 ? 2011 international rectifier ordering information standard pack base part number package type form quantity complete part number tube/bulk 95 IR1152Spbf IR1152S soic8n tape and reel 2500 IR1152Strpbf the information provided in this document is believed to be accu rate and reliable. however, international rectifier assumes no responsibility for the consequences of the use of this information. international rectifier assumes no responsibility for any infringement of patents or of other rights of third parties which may result fr om the use of this information. no license is granted by imp lication or otherwise under any patent or patent rights of international rect ifier. the specifications m entioned in this document are subj ect to change without notice. this document supersedes and r eplaces all information previously supplied. for technical support, please contact ir?s technical assistance center http://www.irf.com/technical-info/ world headquarters: 233 kansas st., el segundo, california 90245 tel: (310) 252-7105 http:///

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