iru3073 International Rectifier Corp., iru3073 Datasheet
iru3073
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iru3073 Summary of contents
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... Rev. 1.0 09/17/03 SYNCHRONOUS PWM CONTROLLER WITH DESCRIPTION The IRU3073 controller IC is designed to provide a low cost synchronous Buck regulator for on-board converter for multiple output applications. The outputs can be programmed as low as 0.8V for low voltage applications. Selectable over-current protection is provided by using external MOSFET's on-resistance for optimum cost and performance ...
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... IRU3073 ABSOLUTE MAXIMUM RATINGS Vcc Supply Voltage ................................................... -0.5 - 25V VcL, VcH Supply Voltage .......................................... -0.5 - 25V Storage Temperature Range ...................................... -65°C To 150°C Operating Junction Temperature Range ..................... CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. PACKAGE INFORMATION 16-PIN PLASTIC QSOP NB (Q) ...
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... Output driver for the synchronous power MOSFET. Rev. 1.0 09/17/03 TEST CONDITION SS=3V SS=0V Note 1 P Rt=100K Rt=50K Note 1 C =1500pF LOAD C =1500pF LOAD DB Fb=0.7V, Freq=200KHz MAX Fb=0.9V MIN Note 1 www.irf.com IRU3073 MIN TYP MAX UNITS -0 1.5 V 0.8 700 mmho 210 240 KHz 180 400 460 340 1 ...
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... Vcc 3.5V / 3.3V VcH SS/SD 4 64uA Max POR Comp 5 25K 25K Fb1 6 20uA 3V CS Comp 16 OCSet Fb2 1 Figure 2 - Simplified block diagram of the IRU3073. 4 Bias 3V Generator 1.25V POR UVLO Rt Oscillator Error Comp Error Amp R Reset Dom 0.4V POR FbLo Comp Vcc TSD 0.8V www.irf.com of the power MOSFET. ...
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... THEORY OF OPERATION Introduction The IRU3073 is designed for a two output application and it includes one synchronous buck controller and a linear regulator controller. The PWM section is a fixed frequency, voltage mode and consists of a precision ref- erence voltage, an uncommitted error amplifier, an inter- nal oscillator, a PWM comparator, an internal regulator, a comparator for current limit, gate drivers, soft-start and shutdown circuits (see Block Diagram) ...
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... OCSET OCSET I OCSET IRU3073 Osc Figure 5 - Diagram of the over current sensing. When voltage V OCSET comparator flips and disables the oscillator. The high side MOSFET is turned off and the low side MOSFET is turned on until the inductor current reduces to below current set value ...
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... The cycle-by-cycle over-current limit will hold for a cer- tain amount of time, until the output voltage drops below 0.4V, the under-voltage lock out activates and latches off the output driver. The operation waveform is shown in Figure 4. Normal operation will resume after IRU3073 is powered up again. www.irf.com IRU3073 ...
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... IRU3073 APPLICATION INFORMATION Design Example: The following example is a typical application for IRU3073, the schematic is Figure 17 on page 16. Supply Voltage Switcher V =V L=V H=12V 2.5V OUT OUT DV = 50mV OUT f = 200KHz S Output Voltage Programming Output voltage is programmed by reference voltage and external voltage divider ...
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... The capacitor value must be high enough to absorb the inductor's ripple current. The larger the value of capaci- tor, the lower will be the output ripple voltage. Power MOSFET Selection The IRU3073 uses two N-Channel MOSFETs. The se- lections criteria to meet power transfer requirements is based on maximum drain-source voltage (V source drive voltage (V ...
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... Select 5KV SET Feedback Compensation The IRU3073 is a voltage mode controller; the control loop is a single voltage feedback path including error amplifier and error comparator. To achieve fast transient response and accurate output regulation, a compensa- tion circuit is necessary. The goal of the compensation ...
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... For a general solution for unconditionally stability for ceramic capacitor with very low ESR and any type of output capacitors wide range of ESR values we should implement local feedback with a compensation network. The typically used compensation network for voltage-mode controller is shown in Figure 12. www.irf.com IRU3073 F = 3.41KHz ...
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... IRU3073 V OUT E Vp=V REF Gain(dB) H( Figure 12 - Compensation network with local feedback and its asymptotic gain plot. In such configuration, the transfer function is given by OUT m IN The error amplifier gain is independent of the transcon- ...
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... PC board R 10 layout at a single point. 500 450 400 350 300 250 based DS(ON) 200 150 100 100 Figure 14 - Switching Frequency vs. Rt. increases with tem- www.irf.com IRU3073 150 200 250 300 350 400 450 500 550 ...
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... Fb2 C14 R14 150uF 1K V C10 0.1uF V C2 33pF R7 C7 Comp 2200pF 24K Rt SS/SD C6 0.1uF Gnd Figure 15 - Typical application of IRU3073 for single 5V. 14 Vcc C16 1uF VcL C19 1uF U1 VcH C11 IRU3073 1uF Q1 HDrv IRF7832 P1 D2 BAT54 REF R4 OCSet 5.1K Q2 LDrv ...
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... R2 1.6V Fb2 C14 R14 150uF 1K V C10 0.1uF V C2 33pF R7 C7 Comp 2200pF 24K Rt SS/SD C6 0.1uF Gnd Figure 16 - Typical application of IRU3073. Rev. 1.0 09/17/03 VcH C11 1uF Vcc C16 1uF U1 VcL C19 IRU3073 1uF Q1 HDrv IRF7832 P1 D2 BAT54 REF R4 OCSet 5.1K Q2 LDrv IRF7832 ...
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... Fb2 @ 2A 1K C14 C15 R14 1uF 150uF 1K V C10 0.1uF V C2 33pF R7 C7 Comp 2200pF 24K Rt SS/SD C6 0.1uF Gnd Figure 17 - Typical application of IRU3073. 16 Vcc C11 1uF VcH C16 1uF U1 VcL C19 IRU3073 1uF Q1 HDrv IRF7832 P1 D2 BAT54 REF R4 OCSet 5.1K Q2 LDrv IRF7832 ...
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... DO3316P-102 1 DO5022P-332HC 4 16TPB47M 1 ECU-V1H330JCV 2 ECJ-2VF1E104 1 ECU-V1H222KBV 1 ECJ-2VC1H471J 2 6TPB330M 7 ECJ-2VF1C1O5Z 2 6TPB150M www.irf.com IRU3073 Manuf Web site (www.) IR irf.com Coilcraft coilcraft.com Coilcraft Sanyo sanyo.com Panasonic maco.panasonic.co.jp Panasonic Panasonic Panasonic Sanyo sanyo.com Panasonic maco.panasonic.co.jp Sanyo sanyo.com Any Any Any Any ...
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... IRU3073 APPLICATION EXPERIMENTAL WAVEFORMS Figure 18 - Normal condition at no load. Ch1: HDrv Ch2: LDrv Ch4: Inductor Current 18 Figure 19 - Gate signals when SS pin pulls low. Ch1: HDrv Ch2: LDrv Figure 20 - Soft-Start. Ch1: V (5V) IN Ch2: Bias Voltage (12V) Ch3: V (PWM) OUT1 Ch4: V (LDO) OUT2 www ...
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... IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105 Rev. 1.0 09/17/03 Figure 22 - Load Transient Response (PWM Section). Ch1: V OUT1 Ch4: I OUT1 Ch2: V OUT2 Ch4: I (0-2A) OUT2 Visit us at www.irf.com for sales contact information Data and specifications subject to change without notice. 02/01 www.irf.com IRU3073 (0-8A) TAC Fax: (310) 252-7903 19 ...
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... IRU3073 (Q) QSOP Package, Narrow Body A B PIN NO. 1 NOTE: ALL MEASUREMENTS ARE IN MILLIMETERS. 20 16-Pin D E DETAIL-A C 0. 16-PIN SYMBOL MIN MAX A 4.80 4.98 0.635 BSC B C 0.20 0.30 D 3.81 3.99 E 5.79 6.20 F 1.35 1.75 G 0.10 0.25 G1 1.37 1. BSC J 0.19 0. 0.40 1.27 78638 M www.irf.com DETAIL-A J Rev. 1.0 09/17/03 ...
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... IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105 Rev. 1.0 09/17/03 PIN PARTS COUNT PER REEL 16 2500 Feed Direction Figure A Visit us at www.irf.com for sales contact information Data and specifications subject to change without notice. 02/01 www.irf.com IRU3073 TAPE & REEL Orientation Fig A TAC Fax: (310) 252-7903 21 ...