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* qualification standards c an be found on ir?s web site www.irf.com ? 2008 international rectifier july 13, 2009 automotive grade AUIR2085S high speed, 100v, self oscillating 50% duty cycle, half-bridge driver features ? simple primary side control solution to enable half- bridge dc-bus converters fo r 48v distributed systems with reduced component count and board space ? integrated 50% duty cycle oscillator & half-bridge driver ic in a single so-8 package ? programmable switching frequency with up to 500khz max per channel ? +/- 1a drive current capability optimized for low charge mosfets ? adjustable dead-time 50ns ? 200ns ? floating channel designed for bootstrap operation up to +100vdc ? high and low side pulse width matching to +/- 25ns ? adjustable overcurrent protection ? undervoltage lockout and internal soft start ? leadfree, rohs compliant ? automotive qualified* typical applications ? dc-dc converters ? hev auxiliary converter ? battery management converters product summary topology half-bridge v offset 100 v i o+ & i o- (typical) 1.0a & 1.0a f osc (max) 500khz deadtime 50ns ? 200ns ho/lo pulse matching +/- 25ns package options 8 - lead soic AUIR2085S typical connection diagram auirs2085 com AUIR2085S
AUIR2085S www.irf.com ? 2008 international rectifier 2 table of contents page typical connection diagram 1 description/feature comparison 3 qualification information 4 absolute maximum ratings 5 recommended operating conditions 5 dynamic electrical characteristics 6 static electrical characteristics 6 functional block diagram 7 input/output pin equivalent circuit diagram 9 lead definitions 10 lead assignments 10 package details 12 tape and reel details 13 part marking information 14 ordering information 15
AUIR2085S www.irf.com ? 2008 international rectifier 3 description the AUIR2085S is a self oscillating half-bridge driver ic with 50% duty cycle i deally suited for 36v ? 75v half-bridge dc-bus converters. this product is also suitable for push-pull conv erters without restriction on input voltage. each channel frequency is equal to f osc, which can be set by selecting r t & c t, where f osc = 1/(2*r t .c t ). dead-time can be controlled through proper selection of c t and can range from 50ns to 200ns. internal soft-start increases the pulse width during power up and maintains pulse width matching for the high and low outputs throughout the start up cycle. typically soft-start duty cycle varies beginning from 5-10% ramping up to about 50% over 1000 cycles. the AUIR2085S initiates a soft start at power up and a fter every overcurrent condition. undervoltage lockout prevents operation if v cc is less than 7.5v.
AUIR2085S www.irf.com ? 2008 international rectifier 4 qualification information ? automotive (per aec-q100 ?? ) qualification level comments: this family of ics has passed an automotive qualification. ir?s industrial and consumer qualification level is granted by extension of the higher automotive level. moisture sensitivity level soic8n msl3 ??? 260c (per ipc/jedec j-std-020) esd machine model class m3 (per aec-q100-003) human body model class h2 ( per aec-q100-002 ) charged device model class c5 (per aec-q100-011) ic latch-up test class ii, level b (per aec-q100-004) rohs compliant yes ? qualification standards can be found at international rectifier?s web site http://www.irf.com/ ?? exceptions to aec-q100 requirements are noted in the qualification report. ??? higher msl ratings may be available for the specific package types listed here. please contact your international rectifier sales repr esentative for further information.
AUIR2085S www.irf.com ? 2008 international rectifier 5 recommended operating conditions for proper operation the device should be used within the recommended conditions. ? care should be taken to avoid output switching conditions where the v s node flies inductively below ground by more than 5v. absolute maximum ratings absolute maximum ratings indicate sustained limit s beyond which damage to the device may occur. all voltage parameters are absolute voltages referenc ed to com. the thermal resistance and power dissipation ratings are measured under board mounted and still air conditions. symbol definition min. max. units v b high side floating supply voltage -0.3 150 v cc low side supply voltage ? 25 v s high side floating supply offset voltage v b - 25 v b + 0.3 v ho high side floating output voltage v b - 0.3 v b + 0.3 v lo low side output voltage -0.3 v cc + 0.3 osc osc pin voltage -0.3 v cc + 0.3 v cs c s pin voltage -0.3 v cc + 0.3 v dvs/dt allowable offset voltage slew rate ? 50 v/ns i cc supply current ? 20 ma p d package power dissipation @ ta 25c ? 0.625 w rth ja thermal resistance, junction to ambient ? 200 c/w t j junction temperature ? 150 t s storage temperature -55 150 t l lead temperature (soldering, 10 seconds) ? 300 c symbol definition min. max. units v b high side floating supply voltage v s + 10 v s + 15 v s steady state high side floating supply offset voltage -5 ( ? ) 100 v cc supply voltage 10 15 v i cc supply current ? 5 ma r t timing resistor 10 100 k ? c t timing capacitor 47 470 pf f osc operating frequency (per channel) ? 500 khz t a ambient temperature -40 125 c
AUIR2085S www.irf.com ? 2008 international rectifier 6 dynamic electrical characteristics v cc = v bs = 12v, c load = 1000pf, and t a = 25c unless otherwise specified. static electrical characteristics v cc = v bs = 12v, c load = 1000pf, and t a = 25c unless otherwise specified. symbol definition min typ max units test conditions t r turn-on rise time ? 40 60 t f turn-off fall time ? 20 30 ns v s = 0v f osc per channel output frequency 500 ? ? khz t dt ho/lo output dead time 50 ? ? c t = 100pf, r t = 10k ? t dcs overcurrent shut down delay ? 200 ? pulse on c s pm ho/lo pulse width mismatch -25 ? 25 ns v s = 0v ~ 100v symbol definition min typ max units test conditions v oh high level output voltage, v cc or v bs ? v o ? ? 1.5 v ol low level output voltage ? ? 0.1 v i ieak offset supply leakage current ? ? 50 i qbs quiescent v bs supply current ? ? 150 a i qcc quiescent v cc supply current ? ? 1.5 ma v cs+ overcurrent shutdown threshold 250 300 350 mv v cs- overcurrent shutdown threshold 150 200 250 mv v ccuv+ undervoltage positive going threshold 6.8 7.3 7.8 v ccuv- undervoltage negative going threshold 6.3 6.8 7.3 v bsuv+ high side undervoltage positive going threshold 6.8 7.3 7.8 v bsuv- high side undervoltage negative going threshold 6.3 6.8 7.3 v i o+ output high short circuit current ? 1.0 ? i o- output low short circuit current ? 1.0 ? a
AUIR2085S www.irf.com ? 2008 international rectifier 7 functional block diagram com AUIR2085S
AUIR2085S www.irf.com ? 2008 international rectifier 8
AUIR2085S www.irf.com ? 2008 international rectifier 9 input/output pin equivalent circuit diagrams v cc com cs esd diode esd diode r esd esd diode esd diode
AUIR2085S www.irf.com ? 2008 international rectifier 10 lead definitions pin symbol description 1 cs current sense input 2 osc oscillator pin 3 com logic supply return 4 lo low side output 5 v cc logic supply 6 v s floating supply return 7 ho high side output 8 v b high side floating supply lead assignments
AUIR2085S www.irf.com ? 2008 international rectifier 11 pin descriptions cs: the input pin to the overcurrent comparator. exc eeding the overcurrent threshold value specified in ?static electrical parameters? section will terminate output pulses and start a new soft start cycle as soon as the voltage on the pin reduce below the threshold value. osc: the oscillator-programming pin. only two components are required to program the internal oscillator frequency: a resistor connected between the v cc pin and the osc pin, and a c apacitor connected from the osc to com. the approximate oscillator frequency is determined by the following simple formula: f osc = 1 / (2 r t c t ) where frequency is in hertz (hz), rt resistance in ohms ( ? ) and ct capacitance in farads (f). the recommended range of timing resistors is between 10k ? and 100k ? and range of time capacitances is between 47pf and 470pf. the timing resistors less than 10k ? should be avoided. the value of the timing capacitor determines the amount of dead time between t he two output drivers: lower the ct, shorter the dead time and vice versa. it is not recommended to us e a timing capacitor below 47pf, for best performance keep the timing components physically as close as possible to the AUIR2085S. separated ground and v cc traces to the timing components are encouraged. com: signal ground and power ground for all functions. d ue to high current and high frequency operation, a low impedance circuit board ground plane is highly recommended. ho, lo: high side and low side gate drive pins. the high and lo w side drivers can direct ly drive the gate of a power mosfet. the drivers are capable of 1a peak s ource and sink currents. it is recommended that the high and low drive pins be very close to the gates of the high side and low side mosfets to prevent any delay and distortion of the drive signals. v b : the high side power input connection. the high side supply is derived from a bootstrap circuit using a low-leakage schottky diode and a ceramic capacitor. to prevent noise, the schottky diode and bypass capacitor should be very close to the AUIR2085S. v s : the high side power return connection. v s should be connected directly to the source terminal of high side mosfet with a trace as short as possible. v cc : the ic bias input connection for t he device. although the quiescent v cc current is very low, total supply current will be higher, depending on the gate charge of t he mosfets connected to the ho and lo pins, and the programmed oscillator frequency, total v cc current is the sum of quiescent v cc current and the average current at ho and lo. knowing the operating frequenc y and the mosfet gate charge (qg) at selected v cc voltage, the average current can be calculated from: iave = 2 x qg x f osc to prevent noise problem, a bypass ceramic capacitor connected to v cc and com should be placed as close as possible to the AUIR2085S. AUIR2085S has an under voltage lookout f eature for the ic bias supply, v cc . the minimum voltage required on v cc to make sure that ic will work within specif ications must be higher than 8.5v (10v minimum v cc is recommended to prevent asymmetrical gates signal on ho and lo pins that are expected when v cc is between 7.5v and 8.5v).
AUIR2085S www.irf.com ? 2008 international rectifier 12 package details:
AUIR2085S www.irf.com ? 2008 international rectifier 13 tape and reel details: 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 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 metric imperial 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
AUIR2085S www.irf.com ? 2008 international rectifier 14 part marking information
AUIR2085S www.irf.com ? 2008 international rectifier 15 ordering information standard pack base part number package type form quantity complete part number tube/bulk 95 AUIR2085S AUIR2085S soic8 tape and reel 2500 AUIR2085Str 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 ma y result from the use of this information. no license is g ranted by implication or otherwise under any patent or patent rights of inte rnational rectifier. the spec ifications mentioned in this do cument are subject to change without notice. this document supersedes and replaces all in formation 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 revision history

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