IRF IRDC3146EVAL

IRDC3146EVAL
IRU3146 EVALUATION BOARD USER GUIDE
INTRODUCTION
SPECIFICATION DATA
The IRU3146 IC is a Dual synchronous Buck controller,
providing a cost-effective, high performance and flexible
solution. The IRU3146 can be configured as a 2-independent or as a 2-phase controller. The 2-phase configuration is ideal for high current applications. The IRU3146
features 1808 out of phase operation which reduces the
required input/output capacitance and results in a fewer
number of capacitors needed. Other key features offered
by this device include two independent programmable
soft starts, programmable switching frequency up to
400KHz per phase, Hiccup current limit and an under
voltage lockout function. The current limit is provided by
sensing the lower MOSFET's on-resistance for optimum
cost and performance.
This reference board is designed to demonstrate all
the features of IRU3146 and can be configured to two
types of applications:
1) Dual outputs application (Independent Outputs)
2) 2-phase application (Single Output)
This user guide contains the schematic and bill of
materials for each of these applications, and the
design guidelines are described in data sheet.
The MOSFETs sockets on the evaluation board are
dual layout for SOIC-8 and Direct FET footprint.
INPUT/OUTPUT CONNECTIONS
The following is the input/output connections:
Inputs:
JP1: Vin and Gnd
JU4: VCC and Gnd
JU5: VCL/VCH1/VCH2
Outputs:
JP2: Vout1 for Dual output
JP5: Vout2 for Dual output
JP4: Vout for 2-phase application
The connection points for dual output application are
shown in Figure 1. Connect the power supply cables
according to this figure, minimizing wire lengths to reduce losses in the wire. Test points J1, J2, J3 and J4
provide easy connection for oscilloscope voltage probe
to monitor the inductor points for each PWM section
and output voltages.
Dual Outputs
VIN = 12V
VOUT1 = 2.5V
IOUT1 = 10A
VOUT2 = 1.8V
Scope Probe connections:
J1 and J3: Inductor point for L2 and L3
J2 and J4: Outputs for Vout1 and Vout2
Rev.1.0
7/28/04
IOUT1 = 10A
DVOUT = 50mV
2-Phase
VIN = 12V
VOUT1 = 1.8V
IOUT1 = 35A
DVOUT = 50mV
FS = 300KHz
FS = 300KHz
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1
IRDC3146EVAL
Power Supply
12V
CONNECTION DIAGRAM
LOAD
0-10A
LOAD
0-10A
Figure 1 - Connection diagram of evaluation-board for IRU3146 in Dual output configuration
2
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Rev.1.0
7/28/04
IRDC3146EVAL
LAYOUT
The PCB is 4-layers FR4 board, the top layer is dedicated for power components, with two parallel control
MOSFETs and two parallel Synchronous MOSFETs.
These MOSFETs are dual layout for both SOIC-8 and
DirectFET footprint. The input capacitors are all located
close to MOSFETs. The two output inductors are located closed to MOSFETs and are symmetrical to the
output connector for more accurate current sharing result.
The two mid-layers are dedicated for Analog and Power
ground, these two grounds are kept separated from each
other and they are connected at a single point as shown
in Figure3.
All the decoupling capacitors, charge pump capacitor
and feedback components are located close to the IC.
The feedback resistors are tied to the output voltage at
the point of regulation.
Figure 2 - Top layer of evaluation-board for IRU3146.
Rev.1.0
7/28/04
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3
IRDC3146EVAL
Figure 3 - Mid layer of evaluation-board for IRU3146.
4
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Rev.1.0
7/28/04
1
2
3
4
5
6
JP1
+12V
+12V
C1
+
D
C2
+
R9
R36
GND
R7
R37
R38
D1
N35
C3A
+
C16
C3B
+
C3C
+
C3D
+
D
C3E
+
C20
N40
N50
10
C17
18
JU5
R35
VCH
R10
3
14 VCL
N400
C8
VOUT3
C7
C18
C27A
2
C9
VCH2
VCH1
VOUT3
HICCUP
DH1
VCC
OCSET1
DL1
IRU3146
C
R1
N10
R11
R39
N15
19 OCSET1
R12
15 DL1
R13
Q1
R4
21
VP2
C13
R5
N25
JP2
PGND
L2
VDDQ
VOUT1
R14
C22
C23
R22
Q2Q3gate
Q2
R41
C3
COMP1
C12
N20
Q7
Q7gate
Q9
16
Comp2
7
VREF
R27
R28
1uF
VSNS1
VOUT2
27 VREF
R43
D2
C5
R42
C19
VSNS2
COMP2
FB1
C
J2
R23
26 VP2
R15
FB2
C27F
Q3
Comp1
PGND1
R3
C27D C27E
Q1gate
C11
R2
C27C
J1
17 DH1
C10
FB1
C27B
N120
VCC
25
N90
JU4
VCL
HICCUP
U1
BAT54A
22 FB1
R29
R6
C6
R44
R8
RT
4
RT
VSNS2
23 VSNS1
5
R16
VSNS2
20
SS1
C15
8
SS2
FB2
DH2
OCSET2
VCC
R45
PGOOD 1
6
PGOOD
DL2
VOUT
+ C4A
4x
11 DH2
9
VOUT2
R17
FB2
SS2
B
OCSET2
R18
R40
Q4gate
Q8gate
R19
N200
R20
13 DL2
VOUT
R30
C24
R24
Q8
Q4
JP5
L3
J3
VDDQ
12
1uF
B
J4
C25
R31
Q5
PGND
Q6
SYNC
R32
FB2
Q10
28
C26
R25
N350
GND
C4
VOUT2
Q5Q6gate
R21
SYNC 24
C21
VOUT2
JU1
PGND2
VDDQ
N100
C14
SS1
JP4
D3
BAT54A
N375
VSNS1
JU2
+C4B
+C4C
+C4D
+C4E
VP2
C28A
C28B
C28C
C28D C28E
C28F
R33
R34
R26
General Schematic
A
A
Title
Size
IRU3146
Number
Revision
B
Date:
File:
1
2
3
4
5
28-Jul-2004
C:\Old_Drv\pcb\PCB_last3.ddb
Sheet of
Drawn By:
6
1
2
3
4
5
6
JP1
+12V
D
+12V
GND
R36
D1
VOUT3
C3A
+
C16
C3B
+
C3C
+
C3D
+
D
C3E
+
C20
N40
VCH
N50
10
3
C17
18
C8
14 VCL
C7
C18
C27A
25
JU4
VCC
2
C9
HICCUP
VCH2
VCH1
VOUT3
VCL
U1
HDrv1
VCC
OCSET1
R11
LDrv1
C
N15
Comp1
21
JP2
19 OCSET1
R12
15 LDrv1
R13
Q1gate
Q1
PGND
L2
VDDQ
VOUT1
Q2Q3gate
Q2
IRU3146
C11
R2
C27C
J1
17 HDrv1
C10
N10
C27B
R41
C3
COMP1
PGND1
C12
VP2
16
R27
1uF
VSNS1
26 VP2
C13
N25
Comp2
7
VREF
C5
C19
27
VSNS2
COMP2
FB1
C
R43
D2
R42
R5
VOUT2
J2
BAT54A
22 FB1
R29
C6
R44
VSNS1
R8
RT
4
RT
VSNS2
23 VSNS1
D3
BAT54A
5
VSNS2
6
FB2
C14
SS1
20
SS1
C15
8
SS2
FB2
HDrv2
OCSET2
R45
PGOOD 1
+ C4A
4x
R18
Q4
PGOOD
LDrv2
9
OCSET2
R19
SYNC 24
C21
JP5
C4
VOUT2
N200
VOUT2
13 LDrv2
R20
Q5Q6gate
B
J4
R31
PGND
Q5
J3
FB2
28
C28A
JU2
C28B
C28C
R33
Dual Outputs
A
Title
Size
IRU3146
Number
Revision
B
Date:
File:
1
1uF
12
SYNC
GND
A
+C4C
L3
JU1
PGND2
+C4B
Q4gate
SS2
B
VCC
11 HDrv2
2
3
4
5
28-Jul-2004
C:\Old_Drv\pcb\PCB_last3.ddb
Sheet of
Drawn By:
6
IRDC3146EVAL
BILL OF MATERIAL For Dual Output Application, Vin=12V,
[email protected], [email protected]
Ref Desig
Description
Q1,Q4
MOSFET
Q2,Q5
MOSFET
U1
Controller
D1
Diode
D2,D3
Diode
L2,L3
Inductor
C3A-E, C4A-C
Cap,Poscap
C27B-D, C28D-F
Cap,Poscap
C14,C15,C16
Cap,Ceramic
C17,C18
Cap.Ceramic
C3,C4,C5,C6,C7,C8,C9,C20,C21
Cap,Ceramic
C11
Cap,Ceramic
C13
Cap,Ceramic
R2
Resistor
R5
Resistor
R8
Resistor
R12,R19
Resistor
R27,R41
Resistor
R29,R33,R42,R44
Resistor
R31,R43
Resistor
R45
Resistor
R36
Resistor
R3,6,7,10,11,13,15,18,20,35
Resistor
R1,4,9,32,39,14,16,17,40,21,22,23,24,28, Resistor
R34,37,38,25,26,30
Resistor
C1,2,C3A,C4C-E, C27E-F,C28A-D,
Capacitor
C19,C10,12,23,24,22,25,26
Capacitor
Q3,Q6,Q7,Q8,Q9,Q10
Transistor
J1,J2,J3,J4
Scope Probe
Terminal
JP1,JP2,JP5
JU1,JU2,JU4,JU5
Jumper
Bumpon
Rev.1.0
7/28/04
Value
Qty
2
30V,11mOhm
30V, 6mOhm
2
Synchronous PWM 1
1
Fast Switching
Fast Switching
2
2.45mH,12A,4.9mV 2
8
47mF, 16V
330mF,6.3V,40mV 6
0.1mF, Y5V, 25V
3
2
1mF, X7R, 25V
1mF, Y5V, 16V
9
10nF, X7R, 50V
1
1
15nF, X7R, 50V
5.65KV
1
3.9K
1
1
33K
5.11K, 1%
2
2.15K, 1%
2
4
1kV, 1%
1.24K,1%
2
50k,1%
1
1
100V
Short, 0V
10
Open
14
6
Open
Open
12
Open
8
6
Open
4
2-Pos terminal
3
4
4
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Part#
IRF7821
IRF8113
IRU3146
BAT54S
BAT54A
ETQP6F2R5BFA
16TPQC47M
6TPB330M
ECJ-2VF1E104Z
ECJ-3YB1E105K
ECJ-2VF1C105Z
ECJ-2VB1H103K
ECJ-2VB1H153K
Any
Manuf
IR
IR
IR
IR
IR
Panasonic
Sanyo
Sanyo
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
131-5031-00
ED1973-ND
S1012-02-ND
SJ-67A2 Black
Tektronix
Digi-Key
Digi-Key
3M
7
IRDC3146EVAL
TYPICAL OPERATING WAVEFORMS
Figure 4- 2.5V Switching Waveforms at no Load
Figure 5- 2.5V Switching Waveforms at 10A Load
8
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Rev.1.0
7/28/04
IRDC3146EVAL
Figure 6- 1.8V Switching Waveforms at no Load
Figure 7- 1.8V Switching Waveforms at 10A Load
Rev.1.0
7/28/04
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9
IRDC3146EVAL
Figure 8- Power Up Waveforms
Figure 9- Power Up Waveforms
(Internal Regulator)
10
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Rev.1.0
7/28/04
IRDC3146EVAL
Figure 9- Shut Down, SS1 pulls Low
Figure 10- Shut Down, SS2 pulls Low
Rev.1.0
7/28/04
www.irf.com
11
IRDC3146EVAL
Figure 11- Short Circuit Condition (Hiccup Mode) for 2.5V Output
Figure 12- Short Circuit Condition (Hiccup Mode) for 1.8V Output
12
www.irf.com
Rev.1.0
7/28/04
IRDC3146EVAL
Figure 12- Load Transient Response
Step Load for 2.5V (0-10A)
Step Load for 1.8V (0-7A)
IRF7821/8113_12V_1.8V_2.5V_0_15A
Room Temp
95
90
% Efficiency
85
80
75
1.8V out
2.5V out
70
65
60
55
50
0
2
4
6
8
10
12
14
16
Iout
Figure 13- Efficiency for 2.5V and 1.8V outputs at room temperature no air flow.
L2=L3=2.17uH @ 17A
Rev.1.0
7/28/04
www.irf.com
13
1
2
3
4
5
6
JP1
+12V
+12V
C1
+
D
C2
+
GND
R36
D1
VOUT3
C3A
+
C16
C3B
+
C3C
+
C3D
+
D
C3E
+
C20
N40
VCH
N50
10
3
C17
18
C8
14 VCL
C7
C18
C27A
25
JU4
VCC
2
C9
HICCUP
VCH2
VCH1
VOUT3
VCL
U1
HDrv1
VCC
OCSET1
R11
LDrv1
C
N15
Comp1
21
C27D C27E
JP2
19 OCSET1
R12
15 LDrv1
R13
Q1gate
Q1
PGND
L2
VDDQ
VOUT1
C23
R22
Q2Q3gate
Q2
IRU3146
C11
R2
C27C
J1
17 HDrv1
C10
N10
C27B
R41
C3
COMP1
PGND1
C12
VP2
16
R27
1uF
VSNS1
26 VP2
D2
C5
R42
C13
R5
N25
Comp2
7
VREF
VSNS1
RT
4
27 VREF
COMP2
FB1
R8
RT
VSNS2
BAT54A
22 FB1
R29
23 VSNS1
JP4
D3
BAT54A
VDDQ
VOUT
5
N100
C14
VOUT2
SS1
20
SS1
C15
SS2
8
FB2
HDrv2
OCSET2
R45
PGOOD 1
6
VOUT
FB2
11 HDrv2
+ C4A
4x
R18
Q4
PGOOD
LDrv2
9
OCSET2
R19
SYNC 24
C24
R24
JP5
L3
C4
VOUT2
N200
VOUT2
13 LDrv2
R20
1uF
B
J4
Q5Q6gate
PGND
Q5
J3
JU1
PGND2
C21
Q4gate
SS2
B
VCC
C
J2
12
SYNC
GND
28
C28A
C28B
C28C
C28D C28E
JU2
+C4B
A
+C4C
+C4D
+C4E
2-Phase, Single Output
A
Title
Size
IRU3146
Number
Revision
B
Date:
File:
1
2
3
4
5
28-Jul-2004
C:\Old_Drv\pcb\PCB_last3.ddb
Sheet of
Drawn By:
6
IRDC3146EVAL
BILL OF MATERIAL For 2-Phase Application, Vin=12V, [email protected]
Ref Desig
Q1,Q4
Q2,Q5
U1
D1
D2,D3
L2,L3
C1,C2,C3A-E, C4A-E
C27A-E, C28A-E
C14,C16
C17,C18
C3,C4,C5,C7,C8,C9,C20,C21,C23,C24
C10,C12
C11,C13
R2
R5
R8
R12,R19
R22,R24,R29,R42
R27,R41
R36
R3,6,7,11,13,18,20,35,10,16,17,23
R1,4,37,38,9,25,26,34,28,43,44,30,31,33,32
R14,R21,R39,R40,R15
C19,22,25,26,6,19
C15
Q9,Q10
J1,J2,J3,J4
JP1,JP4
JU1,JU2,JU3,JU4,JU5
Description
DirectFET
DirectFET
Controller
Diode
Diode
Inductor
Cap, Poscap
Cap, Ceramic
Cap, Ceramic
Cap, Ceramic
Cap, Ceramic
Cap, Ceramic
Cap, Ceramic
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Value
Qty
30V,9mOhm
2
2
30V,4mOhm
Synchronous PWM 1
Fast Switching
1
2
Fast Switching
0.8mH,27A,1.56mV 2
47mF, 16V
12
330mF,6.3V,40mOhm 10
0.1mF, Y5V, 25V
2
1mF, X7R, 25V
2
10
1mF, Y5V, 16V
100pF, X7R, 50V
2
15nF, X7R, 50V
2
1
5.11K,1%
6.8K,1%
1
33K,1%
1
2
5K, 1%
1K, 1%
4
1.24K, 1%
2
1
100V
Resistor
Short, 0V
12
Resistor
Open
15
Resistor
5
Open
Capacitor
Open
6
Short
Capacitor
1
Open
Transistor
2
2-Pos terminal
Scope Probe
4
Terminal
2
Jumper
4
Part#
IRF6617
IRF6618
IRU3146
BAT54S
BAT54A
ETQP1H1ROBFA
16TPQC47M
6TPB330M
ECJ-2VF1E104Z
ECJ-3YB1E105K
ECJ-2VF1C105Z
ECJ-2VC1H100J
ECU-V1H153KBG
Manuf
IR
IR
IR
IR
IR
Panasonic
Sanyo
Sanyo
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
131-5031-00
ED1973-ND
S1012-02-ND
Tektronix
Digi-Key
Digi-Key
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
Rev.1.0
7/28/04
www.irf.com
15