IRU3048CF IRF [International Rectifier], IRU3048CF Datasheet
IRU3048CF
Available stocks
Related parts for IRU3048CF
IRU3048CF Summary of contents
Page 1
... VcH1 VcH2 HDrv1 Vcc LDrv1 V OUT3 PGnd U1 Fb3 IRU3048 Fb1 R3 Comp1 Fb2 HDrv2 R4 Comp2 LDrv2 SS Gnd C5 DEVICE PACKAGE IRU3048CF 16-Pin TSSOP (F) IRU3048CS 16-Pin SOIC NB (S) www.irf.com Data Sheet No.PD94253 IRU3048 PRELIMINARY DATA SHEET OUT1 OUT2 ...
Page 2
IRU3048 ABSOLUTE MAXIMUM RATINGS Vcc Supply Voltage .................................................. 25V VcH1=VcH2 Supply Voltage ...................................... Storage Temperature Range ...................................... -65°C To 150°C Operating Junction Temperature Range ..................... PACKAGE INFORMATION 16-PIN PLASTIC TSSOP (F) TOP VIEW Gnd 1 16 Fb1 Fb2 2 15 ...
Page 3
PARAMETER Error Amp Fb Voltage Input Bias Current Fb Voltage Input Bias Current Transconductance 1 Transconductance 2 Oscillator Frequency Ramp Amplitude Output Drivers Rise Time Fall Time Dead Band Time Max Duty Cycle Min Duty Cycle LDO Controller Drive Current ...
Page 4
IRU3048 BLOCK DIAGRAM 25uA 64uA Max Error Amp1 25K 1.25V 25K Fb1 Error Amp2 25K 1.25V 25K Fb2 ...
Page 5
THEORY OF OPERATION Introduction The IRU3048 is designed for multi-outputs applications. It includes two synchronous buck controllers and a lin- ear regulator controller. The two synchronous controller operates with fixed frequency voltage mode and is con- figured as two independent ...
Page 6
IRU3048 If the high value feedback resistors are used, the input bias current of the Fb pin could cause a slight increase in output voltage. The output voltage set point can be more accurate by using precision resistor. Soft-Start Programming ...
Page 7
For Di =25 get L =9.9mH For Di =25 get: L =5.7mH Panasonic provides a range of inductors in different val- ues and low profile for ...
Page 8
IRU3048 Feedback Compensation The IRU3048 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. ...
Page 9
For 12V F = 2.8KHz IN1 LC1 V = 1.25V OSC 30KHz R = 1.64K 26.5KHz m = 600mmho ESR1 This results to R =46.4KV; Choose R ...
Page 10
IRU3048 Cross Over Frequency 2p3Lo3Co OSC Where Maximum Input Voltage Oscillator Ramp Voltage OSC Lo = Output Inductor Co = Total Output ...
Page 11
Layout Consideration The layout is very important when designing high fre- quency switching converters. Layout will affect noise pickup and can cause a good design to perform with less than expected results. Start to place the power components, make all ...
Page 12
IRU3048 DEMO-BOARD APPLICATION 12V 3. 12V L1 5V 1uH C4 C5 33uF 1uF 1uF 3. OUT3 47uF ...
Page 13
... R1,3,10,12 Resistor 2.15V R2 Resistor 10V R4, R13 Resistor 4.7V R5,7,8,15 Resistor 1K Resistor 1.65K Resistor 46.4K R11 Resistor 39.2K R14 Resistor 442V, 1% Rev. 1.7 09/12/02 Value Qty Part# 1 IRLR2703 2 IRF7313 1 IRU3048CF 1 BAT54S 2 ELL6SH1R0M 1 ELLATV6R8M 1 ETQP6F102HFA 7 ECJ-2VF1C105Z 2 ECS-T1CD336R 2 ECJ-2VF1E104Z 1 ECJ-3YB1E105K 2 ECS-T1AD476R 2 ECJ-2VC1H471J 2 ECJ-2VB1H182K 1 16TPB47M 5 6TPC150M www.irf.com ...
Page 14
IRU3048 WAVEFORMS 2A 0A Figure 4 - Transient response @ I for 3.3V output. Figure 6 - Transient response @ I for 2.5V output Figure 5 - Transient response @ I OUT = 0 to ...
Page 15
WAVEFORMS Figure 8 - Output voltage ripple for 1. 3.3V OUT1 V : 1.8V OUT2 V : 2.5V OUT3 Vss Figure 10 - Soft-start voltage Vs. output voltages. IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, ...
Page 16
IRU3048 A 1.0 DIA E PIN NUMBER NOTE: ALL MEASUREMENTS ARE IN MILLIMETERS. 16 (F) TSSOP Package 16-Pin 16-PIN SYMBOL DESIG MIN NOM MAX 0.65 BSC A B 4.30 4.40 4.50 ...
Page 17
Surface Mount, Narrow Body A B PIN NO. 1 NOTE: ALL MEASUREMENTS ARE IN MILLIMETERS. Rev. 1.7 09/12/02 (S) SOIC Package C E DETAIL 0.38 0.015 16-PIN SYMBOL MIN MAX ...
Page 18
IRU3048 PACKAGE SHIPMENT METHOD PKG PACKAGE DESIG DESCRIPTION F TSSOP Plastic S SOIC, Narrow Body 1 1 Feed Direction Figure A IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105 18 PIN PARTS COUNT PER ...