Feb 21, 2011 IR1152S FIXED 66kHz FREQUENCY, µPFC ONE CYCLE CONTROL PFC IC WITH BROWN-OUT PROTECTION Features • VCC under voltage lockout • Programmable soft start • Micropower startup • User initiated micropower “Sleep Mode” • 750mA peak gate drive • Latch immunity and ESD protection • 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 Description Package µPFC IR1152 power factor correction IC, based on IR proprietary "One Cycle Control" (OCC) technique, provides 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, VCC UVLO, soft-start and micropower startup current of less than 75µA. 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. IR1152 Application Diagram ACIN1 - + VOUT VCC ACIN2 1 2 3 4 COM GATE COMP VCC ISNS VFB BOP OVP/EN 8 + 7 6 5 IR1152 RTN www.irf.com © 2011 International Rectifier IR1152S Qualification Information Qualification Level Moisture Sensitivity Level Machine Model ESD Human Body Model IC Latch-Up Test RoHS Compliant Industrial Comments: This family of ICs has passed JEDEC’s Industrial qualification. IR’s Consumer qualification level is granted by extension of the higher Industrial level. MSL2 260°C (per IPC/JEDEC J-STD-020) Class A (per JEDEC standard JESD22-A115) Class 1A (per EIA/JEDEC standard EIA/JESD22-A114) Class I, Level A (per JESD78) Yes Absolute Maximum Ratings Stresses beyond those listed under “Absolute Maximum 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 referenced to COM. Thermal resistance and power dissipation are measured under board mounted and still air conditions. Parameters VCC Voltage ISNS voltage ISNS Current VFB voltage VOVP voltage VBOP voltage COMP voltage Gate Voltage Junction Temperature Operating Range Storage Temperature Thermal Resistance Package Power Dissipation www.irf.com Symbol VCC VISNS IISNS VFB VOVP VBOP VCOMP VGATE Min. -0.3 -10 -2 -0.3 -0.3 -0.3 -0.3 -0.3 Max. 20 0.3 2 6.5 6.5 9 6.5 18 Units V V mA V V V V V TJ -40 150 °C TS RθJA PD -55 150 128 976 °C °C/W mW 2 Remarks Not internally clamped TAMB=25°C © 2011 International Rectifier IR1152S Electrical Characteristics The electrical characteristics involve the spread of values guaranteed within the specified supply voltage and junction temperature range TJ from – 25° C to 125°C. Typical values represent the median values, which are related to 25°C. If not otherwise stated, a supply voltage of VCC =15V is assumed for test condition Supply Section Parameters Supply Voltage Operating Range VCC Turn On Threshold VCC Turn Off Threshold (Under Voltage Lock Out) VCC Turn On/Off Hysteresis Operating Current Start-up Current Sleep current Sleep Mode Threshold Symbol Min. VCC Typ. Max. Units 14 17 V VCC ON 12.2 13.1 14 V VCC UVLO 9.4 10.1 10.8 V VCC HYST 2.4 3 3.6 9 14 5 75 75 0.8 V mA mA mA µA µA V Units ICC 3.5 26 26 ICC START ISLEEP VSLEEP 0.55 Symbol Min. Typ. Max. 58 53.8 93 66 72.5 73 99 0 Symbol Min. Typ. Max. VOLP 17 19 Remarks CLOAD =1nF CLOAD =4.7nF Stand-by Mode – Inactive gate VCC=VCC ON - 0.5V Pin OVP/EN=0.4V Bias on OVP/EN pin Oscillator Section Parameters Fixed Oscillator Frequency Maximum Duty Cycle Minimum Duty Cycle fSW DMAX DMIN kHz % % Remarks TAMB=25°C -25°C < TAMB < 125°C VCOMP=5V Pulse Skipping Protection Section Parameters Open Loop Protection (OLP)Threshold Output Overvoltage Protection (OVP) Threshold Output Overvoltage Protection Reset Threshold VOVP 104 VOVP(RST) 101 OVP Input Bias Current IOVP(Bias) Brown-out Protection (BOP) Threshold Brown-out Protection Enable Threshold Bias on VFB pin 106 108 % VREF Bias on VFB and/or OVP/EN pins 103 105 % VREF Bias on VFB and/or OVP/EN pins -0.2 µA VBOP 0.68 0.78 0.88 V VBOP(EN) 1.46 1.56 1.66 V -0.2 µA -0.68 V BOP Input Bias Current IBOP(Bias) Peak Current Limit Protection ISNS Voltage Threshold (IPK LIMIT) VISNS(PK) www.irf.com 21 Units % VREF -0.82 -0.75 3 Remarks Bias on BOP pin Bias on BOP pin Bias on ISNS pin © 2011 International Rectifier IR1152S Internal Voltage Reference Section Parameters Reference Voltage Line Regulation Temp Stability Total Variation Symbol VREF RREG TSTAB ΔVTOT Min. 4.9 Typ. 5 10 0.4 4.85 Max. 5.1 20 Units 5.1 V mV % V Remarks Regulation Voltage on VFB pin, TAMB=25°C 14V < VCC < 17V -25°C < TAMB < 125°C Line & Temperature Voltage Error Amplifier Section Parameters Transconductance Source Current (Normal Mode) Sink Current (Normal Mode) Soft Start Delay Time (calculated) Symbol Min. Typ. Max. Units gm 35 30 17 -58 -80 49 44 59 58 80 -30 -17 µS IOVEA(SRC) IOVEA(SNK) -44 µA µA tSS 60 VCOMP Voltage (Fault) VCOMP FLT 1 1.4 V Effective VCOMP voltage VFB Input Bias Current Output Low Voltage Output High Voltage VCOMP EFF IFB(Bias) VOL VOH VCOMP 4.9 5.1 -0.2 0.25 5.4 V µA V V 485 mV VCOMP Start Voltage www.irf.com START 4.7 5 260 375 4 msec Remarks TAMB=25°C -25°C < TAMB < 125°C TAMB=25°C -25°C < TAMB < 125°C RGAIN=1.1kΩ, CZERO=0.56μF, CPOLE=10nF @100uA steady state VFB=4.9V © 2011 International Rectifier IR1152S Current Amplifier Section Parameters DC Gain Corner Frequency Input Offset Voltage ISNS Input Bias Current Blanking Time Symbol gDC Min. 2.65 fC VIO Typ. 3.1 5 4 IISNS(Bias) TBLANK -57 170 320 Symbol VGLO Min. Typ. 12 10 13 Max. 3.55 16 -13 470 Units V/V kHz mV µA ns Remarks Average Current Mode, Note 1 Note 1 VFB=0V, VISNS=-1V Gate Driver Section Parameters Gate Low Voltage Gate High Voltage VGTH Rise Time tr Fall Time tf Max. 0.8 14 25 60 35 65 Output Peak Current IOPK 750 Gate Voltage at Fault 0.08 VG fault Note 1: Guaranteed by design, but not tested in production www.irf.com 5 Units V V ns ns ns ns mA V Remarks IGATE = 200mA VCC=17V, Internally Clamped VCC=11.5V CLOAD = 1nF, VCC=15V CLOAD = 4.7nF, VCC=15V CLOAD = 1nF, VCC=15V CLOAD = 4.7nF, VCC=15V CLOAD = 4.7nF, VCC=15V, Note 1 IGATE = 20mA © 2011 International Rectifier IR1152S Block Diagram OVP/EN ISNS VBIAS SLEEP (POWER OFF) VSLEEP ENABLE Comparator OVP (OVP) Comparator VBIAS VOVP V BIAS OVP (OVP) VOVP(RST) VISNS(PK) V BIAS IPK LIMIT Comparator gDCVISNS fC OVP (VFB) Comparator VOVP VOVP(RST) Current Amplifier OVP (VFB) VCOMP START OVP (VFB) - Vm VBIAS OVP (OVP) + V BIAS V BIAS V BIAS S INTEGRATED RAMP + OSCILLATOR V BIAS Q GATE R VM 0 VREF VFB MAX DUTY CYCLE LIMIT Voltage Error Amplifier COMP UVLO (POWER OFF) VCOMP Discharge UVLO Block VCC Bias & Internal References V BIAS OLP VOLP OPEN LOOP Comparator BOP COM UVLO/SLEEP STAND-BY VBIAS BOP VBOP(EN) VBOP BROWN OUT Comparator www.irf.com 6 © 2011 International Rectifier IR1152S Lead Assignments & Definitions PIN 1 2 3 SYMBOL COM COMP ISNS DESCRIPTION Ground Voltage Loop Compensation Current sense 4 5 6 7 8 BOP OVP/EN VFB VCC GATE Brown-out Fault Detect Overvoltage Fault Detect/Enable Output Voltage Sense IC Supply voltage Gate Drive Output www.irf.com 7 IR1145 IR1152 COM GATE COMP VCC ISNS VFB BOP OVP/EN © 2011 International Rectifier IR1152S IR1152 General Description The µPFC IR1152 IC is intended for power factor correction in continuous conduction mode Boost PFC converters operating at fixed switching frequency with average current mode control. 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 enough to not track the 2xfAC 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 available 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 effectively 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 Vm (which is the VCOMP pin voltage minus a DC offset of VCOMP,START) and the current sense signal VISNS. The resettable integrator generates a cycle-by-cycle, saw-tooth signal called the PWM Ramp which has an amplitude Vm and period 1/fSW hence a slope of Vm*fSW. www.irf.com 8 The current sense signal is amplified by the current amplifier by a factor gDC and fed into the summing node where it is subtracted from Vm to generate the summer voltage (= Vm–gDC*VISNS). 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 = (Vm - gDC.VISNS)/Vm Assuming steady state conditions where the voltage feedback loop is well regulated (Vm & VOUT are DC signals) & hence instantaneous duty cycle follows the boost-converter equation (D = 1 – VIN(t)/VOUT), the control equation can be re-written as: Vm = gDC.VISNS/(VIN(t)/VOUT) Further, recognizing that VISNS = IL(t).RSNS and rearranging yields: gDC.IL(t).RSNS = VmVIN(t)/VOUT Since Vm, VOUT & gDC are constant terms: IL(t) α VIN(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, VCC,ON and current consumption is less than 75uA. Should VCC pin voltage should drop below VCC,UVLO during normal operation, the IC is pushed back into UVLO mode and VCC pin has to exceed VCC,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, VSLEEP even while VCC is above VCC,ON. This allows the user to disable PFC during application stand-by situations in order to meet stand-by regulations. Since VSLEEP is less than 1V, even logic level signals can be employed. © 2011 International Rectifier IR1152S - OVP feature in IR1152 is "dual" and "dedicated". There are 2 overvoltage comparators in IR1152 marked OVP(OVP) and OVP(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 VOVP, an overvoltage situation is detected and the gate drive is immediately terminated. The gate drive is re-enabled only after both pin voltages are below VOVP(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. IR1152 General Description Programmable Soft Start The soft start process controls the rate of rise of the voltage feedback loop error signal 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. - 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 VBOP, 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 reenters normal operation only after BOP pin exceeds VBOP(EN). During start-up the IC is held in Stand-by Mode until this pin exceeds VBOP(EN). - Soft-current limit is an output voltage fold-back type protection feature encountered when the PFC converter input current exceeds to a point where the Vm voltage saturates. As mentioned earlier, the amplitude of input current is directly proportional to Vm, the error voltage of the feedback loop. Vm is clamped to a certain maximum voltage inside the IC (given by VCOMP,EFF parameter in datasheet). If the input current causes the Vm 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 VOUT 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 sense resistor is performed based on soft-current limit (i.e. Vm saturation) and at the system condition which demands highest input current (minimum VAC & maximum POUT). - OLP is activated whenever the VFB pin voltage falls below VOLP 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 VOLP. - Cycle-by-cycle peak current limit protection instantaneously turns-off the gate output whenever the ISNS pin voltage exceeds VISNS(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 VISNS(PK) threshold. This protection feature incorporates a leading edge blanking circuit to improve noise immunity. 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). www.irf.com 9 © 2011 International Rectifier IR1152S IR1152 Pin Description Pin COM: This is ground potential pin of the IC. All internal devices are referenced 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 the voltage error amplifier. The voltage loop error signal Vm used in the control algorithm is derived from VCOMP (Vm =VCOMP– VCOMP,START). VCOMP is actively discharged using an internal resistance to below VCOMP,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 VCOMP,START. Also during start-up, the VCOMP voltage has to be less than VCOMP,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 VISNS exceeds VISNS(PK) threshold in magnitude, the gate drive is instantaneously disabled. Any external filtering 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 + 2xfAC ripple). During start-up the BOP pin voltage has to exceed VBOP(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 VBOP and the IC is pushed into Stand-by mode. Subsequently the pin has to exceed VBOP(EN) for the IC to exit Stand-by and resume normal operation. www.irf.com 10 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 VSLEEP 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 2MΩ. 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. © 2011 International Rectifier IR1152S IR1152 Modes of operation 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. Referenced to States & Transition Diagram UVLO/Sleep Mode: The IC is in the UVLO/Sleep mode when VCC pin voltage is below VCC,ON at start-up or when VCC pin voltage drops below VCC,UVLO during normal operation or when OVP/EN pin voltage is below VSLEEP. 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 VSLEEP even if VCC pin voltage is above VCC,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 ISLEEP 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 VCOMP,START threshold prior to entering the sleep mode, in order to facilitate soft-start upon resumption of operation. 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 normal mode, the IC is pushed into either a Stand-by mode or UVLO/Sleep mode then COMP pin is actively discharged below VCOMP,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 VOVP 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 VOVP(RST) threshold. This state is accessible from both the soft start and normal modes 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 VBOP(EN) prior to system start-up and when BOP pin voltage drops below VBOP after start-up. An Open-loop situation is sensed anytime VFB pin voltage is less than VOLP. 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 VCOMP,START whenever this state is entered from normal operation in order to facilitate soft-start upon resumption of operation. IPK LIMIT Mode: The IC enters IPK LIMIT mode whenever the magnitude of ISNS pin voltage exceeds the VISNS(PK) threshold triggering cycle-bycycle peak over-current protection. When this happens, the IC immediately disables the gate drive and holds it in that state. Gate drive is reenabled when magnitude of ISNS pin voltage drops below VISNS(PK) threshold. This state is accessible from both the soft start and normal modes of operation. Soft Start Mode: During system start-up, the softstart mode is activated once the VCC voltage has exceeded VCC,ON, the VFB pin voltage has exceeded VOLP and BOP pin voltage has exceeded VBOP(EN) and VCOMP voltage is less than VCOMP,START i.e. a pre-bias on COMP pin greater than VCOMP,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 VCOMP,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 softsystem start time is programmable. www.irf.com 11 © 2011 International Rectifier IR1152S State & Transitions Diagram AC POWER ON Gate Inactive Internal Circuits Unbiased UVLO/SLEEP MODE Gate Inactive Internal Circuits Biased Vcomp Discharged VCC > VCCON AND VOVP > VSLEEP VCC < VCC UVLO OR VOVP < VSLEEP STAND – BY MODE Gate Inactive Internal Circuits Biased Vcomp Discharged VCC < VCC UVLO OR VOVP < VSLEEP VFB < VOLP OR VBOP < VBOP (VTH) IPK LIMIT FAULT Present PulseTerminated Gate Inactive Oscillator Active VFB > VOLP AND VBOP > VBOP(EN) AND VCOMP < VCOMP,START VFB < VOLP OR VBOP < VBOP (VTH) VCC < VCC UVLO OR VOVP < VSLEEP SOFT START |VISNS| > |VISNS(PK)| |VISNS| < |VISNS(PK)| Gate Active Oscillator Active CZ Charging VCOMP Rising Cz fully charged VCC < VCC UVLO OR VOVP <VSLEEP |VISNS| > |VISNS(PK)| NORMAL |VISNS| < |VISNS(PK)| Gate Active Oscillator Active VOVP > VOVP (VTH) OR VFB > VOVP (VTH) VFB < VOLP OR VBOP < VBOP (VTH) VOVP < VOVP(RST) AND VFB < VOVP(RST) OVP FAULT VCC < VCC UVLO OR VOVP < VSLEEP www.irf.com 12 Present PulseTerminated Gate Inactive Oscillator Active VBOP < VBOP (VTH) © 2011 International Rectifier IR1152S Voltage on VCC pin IR1152 Timing Diagrams VCC(ON) VCC(UVLO) UVLO NORMAL UVLO Voltage on VFB pin VCC Undervoltage Lockout 1.56V 0.76V STAND-BY NORMAL STAND-BY Brown-out Protection www.irf.com 13 © 2011 International Rectifier IR1152S 13.5 V 10 VCC UVLO Thresholds ISUPPLY (mA) 13.0 V 1 0.1 12.5 V 12.0 V 11.5 V VCC UV+ 11.0 V 10.5 V 10.0 V 0.01 7.0 V 9.0 V 11.0 V 13.0 V 15.0 V 17.0 V Supply voltage 9.5 V -50 °C Figure 1: Supply Current vs. Supply Voltage 0 °C 50 °C 100 °C Temperature 150 °C Figure 2: Undervoltage Lockout vs. Temperature ICCSTART and ISLEEP ICC @ Gate Inactive 3.8 45.0 3.7 40.0 3.6 35.0 ISLEEP Current (uA) IQCC Quiescent Current (mA) VCC UV- 3.5 3.4 ICCSTART 30.0 25.0 20.0 3.3 15.0 3.2 3.1 -50 °C 10.0 -50 °C 0 °C 50 °C 100 °C Temperature 150 °C 50 °C 100 °C 150 °C Temperature Figure 4: Startup Current and Sleep Current vs. Temperature Figure 3: Icc Current vs. Temperature www.irf.com 0 °C 14 © 2011 International Rectifier IR1152S 5.05 68.5 67.5 67.0 Vcomp=5V Reference Voltage (V) Switching Frequency (KHz) 68.0 Vcomp=1V 66.5 66.0 65.5 65.0 64.5 5.03 5.01 4.99 4.97 64.0 63.5 -50 °C 0 °C 50 °C 100 °C 4.95 -50 °C 150 °C 0 °C Temperature Error Amplifier Source/Sink Current (uA) EA Transconductance gm (uS) 52.0 50.0 48.0 46.0 44.0 42.0 50 °C 100 °C 150 °C 80.6 70.6 Source |Sink| 60.6 50.6 40.6 30.6 20.6 10.6 -50 °C 0 °C 50 °C 100 °C 150 °C Temperature Temperature Figure 8: Voltage Error Amplifier Source & Sink Current vs. Temperature Figure 7: Voltage Error Amplifier Transconductance vs. Temperature www.irf.com 150 °C Figure 6: Reference Voltage vs. Temperature 54.0 0 °C 100 °C Temperature Figure 5: Switching Frequency vs. Temperature 40.0 -50 °C 50 °C 15 © 2011 International Rectifier 3.20 -0.60 Peak Current Limit Threshold (V) Current Sense Amplifier DC Gain gDC (V/V) IR1152S 3.15 3.10 3.05 3.00 2.95 2.90 -50 °C 0 °C 50 °C 100 °C 150 °C -0.65 -0.70 -0.75 -0.80 -0.85 -0.90 -50 °C 0 °C Temperature Figure 9: Current Amplifier DC Gain vs. Temperature 150 °C 1.6 VOVP 1.5 VOVP(RST) 1.4 BOP Threshold (V) OVP Threshold (%Vref) 100 °C Figure 10: Peak Current Limit Threshold VISNS(PK) vs. Temperature 1.10 1.08 50 °C Temperature 1.06 1.04 1.3 1.2 1.1 VBOP(EN) VBOP 1.0 0.9 0.8 1.02 0.7 1.00 -50 °C 0 °C 50 °C 100 °C 150 °C 0 °C 50 °C 100 °C 150 °C Temperature Temperature Figure 12: Brown-Out Protection Thresholds vs. Temperature Figure 11: Over Voltage Protection Thresholds vs. Temperature www.irf.com 0.6 -50 °C 16 © 2011 International Rectifier IR1152S Package Details: SOIC8N www.irf.com 17 © 2011 International Rectifier IR1152S Tape and Reel Details: SOIC8N LOADED TAPE FEED DIRECTION A B H D F C NOTE : CONTROLLING DIM ENSION IN M M E G CARRIER TAPE DIMENSION FOR Metric Code Min Max A 7.90 8.10 B 3.90 4.10 C 11.70 12.30 D 5.45 5.55 E 6.30 6.50 F 5.10 5.30 G 1.50 n/a H 1.50 1.60 8SOICN Imperial Min Max 0.311 0.318 0.153 0.161 0.46 0.484 0.214 0.218 0.248 0.255 0.200 0.208 0.059 n/a 0.059 0.062 F D C B A E G H REEL DIMENSIONS FOR 8SOICN Metric Code Min Max A 329.60 330.25 B 20.95 21.45 C 12.80 13.20 D 1.95 2.45 E 98.00 102.00 F n/a 18.40 G 14.50 17.10 H 12.40 14.40 www.irf.com 18 Imperial Min Max 12.976 13.001 0.824 0.844 0.503 0.519 0.767 0.096 3.858 4.015 n/a 0.724 0.570 0.673 0.488 0.566 © 2011 International Rectifier IR1152S Part Marking Information www.irf.com 19 © 2011 International Rectifier IR1152S Ordering Information Base Part Number Package Type IR1152S SOIC8N Standard Pack Complete Part Number Form Quantity Tube/Bulk 95 IR1152SPBF Tape and Reel 2500 IR1152STRPBF The information provided in this document is believed to be accurate 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 from the use of this information. No license is granted by implication or otherwise under any patent or patent rights of International Rectifier. The specifications mentioned in this document are subject to change without notice. This document supersedes and replaces 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 www.irf.com 20 © 2011 International Rectifier