IRDC3039EVAL
IRU3039 EVALUATION BOARD USER GUIDE
INTRODUCTION
SPECIFICATION DATA
The IRU3039 controller IC is designed to provide a synchronous Buck regulator and is targeted for applications
where the cost and size is critical. The IRU3039 operates with a single input supply up to 20V. The output
voltage can be programmed as low as 0.8V for low voltage applications. Selectable current limit is provided to
tailor to external MOSFET’s on-resistance for optimum
cost and performance. The IRU3039 features an uncommitted error amplifier for tracking output voltage and is
capable of sourcing or sinking current for applications
such as DDR bus termination.
Switcher:
VIN = 18V
VOUT = 3.3V
IOUT = 8A
DVOUT = 100mV
FS = 200KHz
This device features a programmable switching frequency
set from 200KHz to 400KHz, under-voltage lockout for
both Vcc and Vc supplies, an external programmable
soft-start function as well as output under-voltage detection that latches off the device when an output short is
detected.
INPUT/OUTPUT CONNECTIONS
The following is the input/output connections:
Inputs:
JP1: Input (+18V), Gnd
The connection points is shown in Figure 1. Connect the
power supply cables according to this figure, minimize
wire lengths to reduce losses in the wire. Test point J1
provides easy connections for the oscilloscope voltage
probe to monitor the output voltage.
Outputs:
JP2: VOUT (+3.3V), Gnd
Rev. 1.0
05/30/03
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IRDC3039EVAL
CONNECTION DIAGRAM
Load
0 - 8A
+20V Gnd
Power Supply
6A Supply
Figure 1 - Connection diagram of evaluation-board for IRU3039.
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Rev. 1.0
05/30/03
IRDC3039EVAL
LAYOUT
The four layers for IRU3039 evaluation board are shown
in Figures 2.1-2.4. The input capacitors are all located
close to the MOSFETs. All the decoupling capacitors,
charge pump capacitor and feedback components are
located close to IC. The feedback resistors are tied to
the output voltage at the point of regulation.
The middle layers are dedicated to Power Ground and
Analog Ground. Analog Ground is kept separated from
the Power Ground and it is connected at a single point
as shown in figure 2.1.
Figure 2.1 - Top layer of evaluation-board for IRU3039.
Rev. 1.0
05/30/03
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3
IRDC3039EVAL
PGnd
AnGnd
Figure 2.2 - Middle layer 1.
PGnd
Figure 2.3 - Middle layer 2.
Figure 2.4 - Bottom layer.
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Rev. 1.0
05/30/03
Rev. 1.0
05/30/03
GND
VIN
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Open
R13
Open
0.1uF
R7
14K
VDDQ
C2
R12
Open
5600pF
C7
C1
15uF
15
VO2
C3
1uF
C10
0.1uF
R11
0V
20
19
18
17
VP
FB
VREF
1
COMP
SS / SD
16 OCSET
1uH
L1
NC
2
13
NC
12
RT
VCC
4
LDRV
PGND
GND
NC
5
C11
1uF
VC
HDRV
11
NC
6
7
8
9
10
C13A
1uF
0V
5.76K
R5
R4
0V
R3
15uF
25V
C2C
D2
BAT54
15uF
25V
C2B
Q2
IRF7458
Q1
IRF7466
R14
Open
Figure 3 - Schematic of evaluation-board for IRU3039.
NC
3
U1
IRU3039
14
NC
Open
R6
15uF
25V
C2A
L2
C5
4.7uH
R8
4.7V
C8
470pF
Open
R2
C9B
C9C
R10
1K
R9
3.16K
330uF 330uF Open
40mV 40mV
C9A
D1
BAT54S
1uF
C12
J1
GND
VOUT
C13
1uF
JP2
SCHEMATIC
C6
JP1
R1
0V
IRDC3039EVAL
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IRDC3039EVAL
BILL OF MATERIAL
Ref Desig Description
Q1
MOSFET
Q2
MOSFET
U1
Controller
D1
Schottky Diode
D2
Schottky Diode
L1
Inductor
L2
Inductor
C1,C2A,B,C Cap, Poscap
C5,6,10
Capacitor
C7
Capacitor
C8
Capacitor
C9A,B
Cap, Poscap
C3,11,12,13 Capacitor
C13A
Capacitor
R4
Resistor
R7
Resistor
R8
Resistor
R9
Resistor
R10
Resistor
R1,3,5,11 Resistor
R2,6,12,13,14 Resistor
C2,C9C
Capacitor
JP1,JP2
Connector
J1
Scope Probe
6
Value
Qty
Part#
30V, 12.5mV, 11A
1 IRF7466
30V, 8mV, 14A
1 IRF7458
Synchronous PWM 1 IRU3039
Fast Switching
1 BAT54S
Fast Switching
1 BAT54
1mH, 3A
1 DS1608C-102
4.7mH, 13A
1 DO5022P-472HC
15mF, 25V
4 25TQC15M
0.1mF, Y5V, 25V
3 ECJ-2VF1E104Z
5600pF, X7R, 50V
1 ECU-V1H562KBG
470pF, X7R, 50V
1 ECJ-2VC1H471J
330uF, 40mV
2 6TPB-330M
1mF, Y5V, 16V
4 ECJ-2VF1C105Z
1mF, X7R, 25V
1 ECJ-3YB1E105K
5.76K, 1%
1
14K, 1%
1
4.7V, 1%
1
3.16K, 1%
1
1K, 1%
1
0V
4
Open(NA)
5
Open
2
2 Positive Terminal
2 ED1973-ND
1 131-50310-00
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Manuf
IR
IR
IR
IR
IR
Coilcraft
Coilcraft
Sanyo
Panasonic
Panasonic
Panasonic
Sanyo
Panasonic
Panasonic
Web site (www.)
irf.com
coilcraft.com
sanyo.com
maco.panasonic.co.jp
sanyo.com
maco.panasonic.co.jp
Digikey
Textronix
Rev. 1.0
05/30/03
IRDC3039EVAL
TYPICAL OPERATING CHARACTERISTICS
Test Conditions:
VIN=20V, VOUT=3.3V, IOUT=0-8A, Fs=200KHz
Figure 4 - Normal condition at No Load.
Ch1: HDrv, Ch2: LDrv, Ch4: Inductor Current
Figure 5 - Soft-Start.
Ch1: VIN, Ch2: VOUT, Ch3: VOUT2, Ch4: Vss
Figure 6 - Soft-Start pin grounded.
Ch1: HDrv, Ch2: LDrv
Figure 7 - Output Ripple.
Ch1: Output Ripple, Ch2: HDrv, Ch3: LDrv,
Ch4: Inductor Current
Rev. 1.0
05/30/03
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IRDC3039EVAL
TYPICAL OPERATING CHARACTERISTICS
Test Conditions:
VIN=20V, VOUT=3.3V, IOUT=0-8A, Fs=200KHz
8A
0A
Efficiency (%)
Figure 8 - Output shorted at start up.
Ch1: VOUT, Ch3: Vss, Ch4: Inductor Current
Figure 9 - Load Transient Response
Ch1: VOUT, Ch3: Output Current
90
88
86
84
82
80
78
76
74
72
70
0
1
2
3
4
5
6
7
8
9
10
11
Output Current (A)
Figure 10 - Efficiency Measurement.
VIN=20V, VOUT=3.3V
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
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Rev. 1.0
05/30/03
