iru3065 International Rectifier Corp., iru3065 Datasheet
iru3065
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iru3065 Summary of contents
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... LCD Bias GaAs FET Bias Positive-to-Negative Conversion TYPICAL APPLICATION IRU3065 V SEN REF 10K Figure 1 - Typical application of IRU3065 for single input voltage. PACKAGE ORDER INFORMATION DEVICE IRU3065CLTR DEVICE IRU3065CLTRPbF DESCRIPTION The IRU3065 controller is designed to provide solutions for the applications requiring low power on board switch- ing regulators ...
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... IRU3065(PbF) ABSOLUTE MAXIMUM RATINGS Vcc ......................................................................... 7V V ......................................................................... DD Operating Junction Temperature Range ..................... Operating Ambient Temperature Range ..................... Storage Temperature Range ...................................... -65°C To +150°C ESD Capability (Human Body Model) ........................ PACKAGE INFORMATION 6-PIN PLASTIC SOT-23 (L6) TOP VIEW Vcc GATE Gnd SEN ...
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... This pin sets the maximum load current by sensing the inductor current This pin provides biasing for the output driver. 6 Vcc This pin provides biasing for the internal blocks of the IC. BLOCK DIAGRAM Figure 2 - Simplified block diagram of the IRU3065. and Vcc or an external V OUT Vcc ...
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... IRU3065(PbF) APPLICATION INFORMATION Introduction The IRU3065 is a controller intended for an inverting regulator solution. For example, to generate –5V from a 5V supply. The controller is simple and only has a voltage comparator, current hysteretic comparator, flip- flop and MOSFET driver. It controls a typical buck boost converter configured by a P-channel MOSFET, an in- ductor, a diode and an output capacitor ...
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... APPLICATION EXAMPLE Design Example The following design example is for the evaluation board application for IRU3065. The schematic is shown in fig- ure 1: Where -5V OUT(NOM 200mA OUT f = Maximum Frequency S(MAX 1.2MHz S(MAX Diode Forward Voltage 0.5V D Vcc = 5V VI =145mV 150mV SEN(TH) Voltage Sensing Resistor ...
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... Cap(nF) Fig.4. Rise time versus cap load. The internal gate driver of IRU3065 is designed for load current up to 1A. For higher power applications, external driver is recommended to driver the external FETs. 6 Demo board Evaluation Results Fig.1 shows the evaluation board schematic and the selected components ...
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... Characteristics of IRU3065 Efficiency versus load current 100 200 300 Iout(mA) Efficiency(%) with diode Efficiency(%) with 100ohm resistor Figure.5 Efficiency with 4.7uH inductor, 250kHz op- eration Efficiency versus load current 100 200 Iout(mA) Efficiency(%) with diode Efficiency(%) with 100 resistor Figure 6 ...
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... IRU3065(PbF) Characteristics of IRU3065( Continued) Current comparator threshold versus Vin (T =25C) A 180 170 160 150 140 130 120 4.5 4.7 4.9 5.1 Vin Figure 9. Current sensing comparator upper threshold versus VCC=Vin. Current sensing comparator upper threshold (mV) versus temperature 155 154 153 152 151 150 149 148 ...
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... Figure. 13 Start up Fig. 14. Operation waveform with 20mA load. Fig. 15. Operation waveforms with 250mA load (normal operation) Fig. 16. Operation waveform with 450mA, the bound- ary of continuous mode and discontinuous mode. The output start out of regulation Fig. 17. operation waveform with short output. www.irf.com IRU3065(PbF) 9 ...
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... T s Figure 18 - Operation waveforms of IRU3065 con- trolled buck boost converter at regulation mode. In general, IRU3065 controlled buck boost converter is operated in two modes depending on the load cur- rent. When the load current is small, the buck boost operated in first mode (regulation mode). The operation waveforms are shown in figure 18 ...
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... Figure 21. Then the IRU3065 controlled buck boost converter goes into power limit mode. In this mode, the output power is limited. The output voltage is no longer regulated. The output voltage decreases when the load current increases as shown in Figure 19 ...
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... IRU3065(PbF) Analysis of Operation Regulation Mode From Figure 18, when the PMOS is on, the inductor current increases from zero. That is ---( And the peak current is given by ---(5) PEAK ON L Where t is the turn on time of the PMOS. ON Because the switch is turned off when sensed inductor ...
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... Switching frequency versus output current ) 1200 1000 800 S ---(19) 600 - 400 200 0 0 Predicted fs(KHz) ) ---(20) Figure 25 - The comparison between predicted and measured switching frequency versus www.irf.com IRU3065(PbF) Vout versus output current 0.2 0.4 0.6 Output current (A) Predicted (-Vout) Measured -Vout 0.2 0.4 0.6 Output current (amp) Experiment fs (kHz) output current 0.8 0.8 13 ...
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... IRU3065(PbF IRU3065 V SEN REF 10K Fig IRU3065 application with 100ohm resistor and 100pf cap 14 Other Applications 100ohm Vcc C1 100pF Q1 V GATE IRLML5203 10BQ015 Gnd L1 1.2uH I SEN R1 0.1 R3 10K www.irf.com (-5V) OUT C2 10uF ...
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... IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105 E MIN MAX A 0.90 1.45 A1 0.00 0.15 A2 0.90 1.30 B 0.35 0.50 C 0.09 0.20 D 2.80 3.00 E 2.60 3.00 E1 1.50 1.75 0.95 REF e e1 1.90 REF L 0.10 0. Visit us at www.irf.com for sales contact information Data and specifications subject to change without notice. 9/6/2005 www.irf.com IRU3065(PbF TAC Fax: (310) 252-7903 15 ...