IRDC3065 1 rev. 1.0 10/20/04 www.irf.com specification data introduction iru3065 evaluation board user guide the iru3065 controller is designed to provide solu- tions for the applications requiring low power on board switching regulators. the iru3065 is specifically designed for positive to negative conversion and uses few components for a simple solution. the iru3065 operates at high switching frequency (up to 1.5mhz), resulting in smaller components. the output voltage can be set by using an external resistor divider. the stability over all conditions is inherent with this archi- tecture without any compensation. the device is available in the standard 6-pin sot-23. (see the iru3065 data sheet for detailed description). inputs: jp1: optional vdd input. default vdd is connected to vcc through a charge pump. jp2: optional vref input. if accurate output is re quired, vref should be connected to a accurate refer- ence voltage jp4: 5v bus input and vcc input (default connection). the output voltage will be equal to input voltage with negative sign. outputs: jp3. vout=-5v @200ma. switching frequency fs(max)=1.2 mhz
2 rev. 1.0 10/20/04 IRDC3065 www.irf.com schematic figure 1 - schematic of iru3065 evaluation-board. ref designator description value qty part# manuf q1 mosfet pfet 1 irlml5203 ir u1 controller 1 iru3065 ir d1 diode fast switchinh 1 bat54 ir d2 diode fast switchinh 1 10bq015 ir l2 inductor 1.2ua, 2a 1 lpo1704-122mc coilcraft c1 ceramic cap 1uf, y5v,16v 1 ecj-2vf1c105z panasonic c3 ceramic cap 100pf, x7r,50v 1 ecj-2vc1h100j panasonic c6,c4 ceramic cap 10uf, x5r, 6.3v 2 ecj2fboj106m panasonic r4, r5 resistor 10k, 1%, 0805 2 any any r3 resistor 0.1ohm, 0805 1 any any r1,r7 resistor open 2 r2,r6 resistor short 2 l3 inductor short 1 c5 ceramic cap open 1 jp1,2,3,4 terminal 4 ed1973-nd digi-key j1 scope probe 1 s1012-02-nd digi-key bumpon 4 3m bill of material (bom) 1 2 34 a b c d 4 3 2 1 d c b a title number revision size a date: 2-nov-2004 sheet of file: e:\mqiao\ir_dcdc_ic\iru3065\protel\je3065~1.ddb drawn by : l2 d2 l3 + c3 r1 r6 r3 r5 r4 + c5 + c6 + c4 isns 4 vsns 3 vdd 5 gnd 2 vcc 6 vgate 1 u1 iru3065 q1 mosfet p + c1 vgate vsns isns jp4 vin/ vcc gnd jp3 vo gnd vref vo vin jp1 vdd gnd jp2 vre f/ vcc gnd r2 r7 vcc vdd d1 j1
IRDC3065 3 rev. 1.0 10/20/04 www.irf.com layout-top layer and bottom layer
4 rev. 1.0 10/20/04 IRDC3065 www.irf.com frequency (khz) versus load current 0 100 200 300 400 500 600 700 800 900 0 200 400 600 800 1000 iout(ma) frequency(khz) vout(v) vs iout(ma) 0 1 2 3 4 5 6 0 200 400 600 800 1000 iout(ma) vout(v) frequency versus load current. (vout=-5v, iocp=400ma)t output voltage (absoutle value) versus load curren (vout=-5v, iocp=400ma)t efficiency versus load current 50 55 60 65 70 75 0 100 200 300 400 iout(ma) efficiency(%) efficiency(%) with diode efficiency(%) with 100 resistor efficiency with 1.2uh inductor, 800k hz opera- tion operation characteristics efficiency with 4.7uh inductor, 250khz operation efficiency versus load current 50 55 60 65 70 75 0 100 200 300 400 iout(ma) efficiency(%) efficiency(%) with diode efficiency(%) with 100ohm resistor
IRDC3065 5 rev. 1.0 10/20/04 www.irf.com experimental waveforms start up operation waveform at 20ma load. operation waveform with short output. operation waveform with 450ma, the boundary of continuous mode and discontinuous mode. the out- put start out of regulation operation waveforms with 250ma load (normal operation)
6 rev. 1.0 10/20/04 IRDC3065 www.irf.com ir world headquarters: 233 kansas st., el segundo, california 90245, usa tel: (310) 252-7105 tac fax: (310) 252-7903 visit us at www.irf.com for sales contact information data and specifications subject to change without notice. 02/01
|
