iru3047 International Rectifier Corp., iru3047 Datasheet
iru3047
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iru3047 Summary of contents
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... C3 3. OUT2 PGood Figure 1 - Typical application of IRU3047 configured as 2-phase converter. PACKAGE ORDER INFORMATION T (° Rev. 1.0 09/09/02 DESCRIPTION The IRU3047 IC combines a Dual synchronous Buck controller and a linear regulator controller, providing a cost-effective, high performance and flexible solution for multi-output applications. The Dual synchronous con- troller can be configured as 2-independent or 2-phase controller ...
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... IRU3047 ABSOLUTE MAXIMUM RATINGS Vcc Supply Voltage .................................................. 25V V H1 and V Supply Voltage ........................... Storage Temperature Range ...................................... -65°C To 150°C Operating Junction Temperature Range ..................... PACKAGE INFORMATION 20-PIN PLASTIC SOIC WB (W) TOP VIEW Gnd REF Vp2 Fb2 3 18 ...
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... Fb2 to V OS(ERR)2 P2 Freq Rt=Open V RAMP Tr C =1500pF =1500pF Fb=1V, Freq=200KHz ON T Fb=1.5V OFF I LDO LDO FB I LDO(BIAS) www.irf.com IRU3047 MIN TYP MAX UNITS 0 REF 1 REF 0 REF 1 REF 0 REF 1 REF 4.5 4 ...
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... Reset Dom Ramp1 Set1 Two Phase Oscillator Ramp2 Set2 S PWM Comp2 Q Error Amp2 R Reset Dom 0.5V POR Fb1 PGood Fb2 Fb3 Vcc Figure 2 - Block diagram of the IRU3047. www.irf.com HDrv1 1.25V POR LDrv1 > HDrv2 9 ...
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... During shutdown the MOSFET drivers and the LDO controller turn off. Power Good The IRU3047 provides a power good signal. This is an open collector output and it is pulled low if the output voltages are not within the specified threshold. This pin can be left floating if not used ...
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... OUT1 REF R 5 When an external resistor divider is connected to the output as shown in Figure 3. IRU3047 Fb1 Figure 3 - Typical application of the IRU3047 for programming the output voltage. Equation (1) can be rewritten as Will result to: OUT1 ...
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... The conduction loss is defined as (Upper Switch COND LOAD 2 P (Lower Switch COND LOAD Temperature Dependency DS(ON) The total conduction loss is defined as (Upper Switch)q+P CON(TOTAL) CON www.irf.com IRU3047 1 V OUT ; ---(6) S =5.46mH 3 =3.47mH 4 ), DSS ), maximum output cur ...
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... IRU3047 The R temperature dependency should be consid- DS(ON) ered for the worst case operation. This is typically given in the MOSFET data sheet. Ensure that the conduction losses and switching losses do not exceed the package ratings or violate the overall thermal budget. Choose IRF7811A for control MOSFET and IRF7809A for synchronous MOSFET ...
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... Choose C 9 ---(11) One more capacitor is sometimes added in parallel with C and R . This introduces one more pole which is mainly 9 4 used to supress the switching noise. The additional pole is given by www.irf.com IRU3047 and F [ (1/5 ~ 1/10 ESR ...
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... IRU3047 The pole sets to one half of switching frequency which results in the capacitor C POLE POLE For F << For a general solution for unconditionally stability for any type of output capacitors wide range of ESR values we should implement local feedback with a compensa- tion network ...
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... RC circuit as shown in Figure 8. Ve(s) D(s Figure 8 - The PI compensation network The loop gain function is: H(s)=[G(s)3D(s)3R 3 H(s)=R S2 Select a zero crossover frequency (F switching frequency 20KHz O2 www.irf.com IRU3047 ( OUT = ---(17 OSC ( ---(18 (s) ...
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... IRU3047 H(Fo)= 2p3Fo3L From (19), R can be express as 2p3F IN(SLAVE) OUT Set the zero of compensator to be half of F compensator capacitor can be calculated as LC(SLAVE OUT F LC(SLAVE ---(21) ...
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... R10 C18 C30 1K 1uF 47uF R16 C24 Comp1 2200pF 29.4K R21 C34 Comp2 6.8nF 16.5K PGood PGood SS C29 0.1uF Figure 9 - Typical application of IRU3047, configured as a 2-phase converter in current sharing mode. Rev. 1.0 09/09/ 33uF 1uH D1 BAT54S C3 C4 47uF 0.1uF C32 47uF C9 1uF VcH1 VcH2 Q1 ...
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... C6 IRLR2703 47uF R1 2. 47uF 22K 2200pF R4 C9 19K 2200uF PGood C10 0.1uF Figure 10 - Typical application for IRU3047 configured as two independent controllers 33uF C13 V VcH1 VcH2 1uF C L HDrv1 Vcc LDrv1 V OUT3 PGnd U1 Fb3 Fb1 IRU3047 Vp2 ...
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... Q1 C6 IRLR2703 47uF R1 1. 442 47uF R3 C8 16.2K 3900pF R4 C9 10K 5600pF PGood C10 0.1uF Figure 11 - Typical application for IRU3047 configured for DDR memory application. Rev. 1.0 09/09/02 C13 1uF V VcH1 VcH2 CL HDrv1 Vcc 1/2 D1 BAT54A LDrv1 V OUT3 PGnd U1 Fb1 Fb3 IRU3047 V REF HDrv2 ...
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... R103 10K C100 10000pF C 4 1uF 5V L2, 1uH C23 C11 C12 1uF C22 33uF 16V 2x 330uF Poscap 0V Figure 12 - Typical application for IRU3047 configured as 2-phase converter in current sharing mode IRF7811A C 2 0.1uF Q3 IRF7809A R 8 2.15 R2 2.15 1/2 C104 D100 1uF ...
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... ECJ-2VC1H471J 2 6TPB470M 2 EC-T1CD336R ERJ-M1WSF5MOU Visit us at www.irf.com for sales contact information Data and specifications subject to change without notice. 02/01 www.irf.com IRU3047 Manuf Web site (www.) IR irf.com Any Coilcraft coilcraft.com Coilcraft Coilcraft Panasonic maco.panasonic.co.jp Panasonic Panasonic Panasonic Sanyo sanyo ...
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... IRU3047 20-Pin Surface Mount, Wide Body PIN NO. 1 NOTE: ALL MEASUREMENTS ARE IN MILLIMETERS. 18 (W) SOIC Package C E DETAIL 0.51 0.020 SYMBOL 20-PIN MIN MAX A 12.598 12.979 B 1.018 1.524 C 0.66 REF D 0.33 0.508 E 7.40 7.60 F 2.032 2.64 G 0.10 0.30 I 0.229 0.32 J 10.008 10.654 K 08 ...
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... IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105 Rev. 1.0 09/09/02 PIN PARTS COUNT PER TUBE 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 IRU3047 PARTS T & R PER REEL Orientation 1000 Fig A TAC Fax: (310) 252-7903 19 ...