AN005 [AIC]
AIC1569A Demoboard;
| 型号： | AN005 |
| 厂家： | 
ANALOG INTERGRATIONS CORPORATION |
| 描述： | AIC1569A Demoboard |
| 文件： | 总6页 (文件大小：301K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AN005
Users’ Guide to AIC1569A Demoboard
Abstract
used for driving multiple MOSFETs in parallel
operation. In order to reduce power dissipation and
to increase overall efficiency, MOSFETs should be
The modern Personal PC demands fast processors
that require low voltage and high current.
Conventional synchronous buck converter, such as
AIC1569A, is a cost-effective solution for powering
most of existing processors that require current less
than 20A; however it can not meet the current
requirement of advanced processors that consume
current more than 20A based on the conventional
synchronous buck topology. The High Current
AIC1569A Demo Board is designed to meet the
power requirement of advanced processors. It also
helps to keep the BOM cost low and to save the
board space.
selected carefully. MOSFET features low R
and
ds(on)
low CISS are recommended. Regarding the
AIC1569A operation details, please refer to the
AIC1569A data sheet.
Measurements
The performance of the high current AIC1569A
demo board is measured, including temperature on
key components, gate drive signals, soft start,
transient response, V
load regulation, and
OUT
efficiency, as shown on table 1 and fig.1-fig.13. The
test equipment used in the measurement please
refers to Appendix C.
Circuit Description of the High Current
AIC1569A Demo Board
The AIC1569A (U1) is a high power and high
efficiency switching regulator controller that is
designed to drive N-channel MOSFETs in the
synchronous BUCK topology. The built in 5-bit
Digital-to-Analog Converter (DAC) is used to adjust
1. Temperature on key components
Table 1
MOSFET SIMENS / SPP80N03L
Key Component
( RDS-ON : 6 mW-max )
Output Load
20A
37.1
36.0
48.5
47.6
48.5
48.5
45.0
45.0
49.1
25A
42.3
40.0
51.8
53.1
51.0
53.0
48.5
53
30A
42.6
41.3
64.5
63.0
61.5
63.5
57.0
64.0
73.0
Input Inductor ( L1 )
PWM IC ( AIC1569A )
Up-Side MOSFET (Q1)
Up-Side MOSFET (Q2)
Low-Side MOSFET (Q4)
Low-Side MOSFET (Q5)
Output Inductor ( L3 )
Output Inductor ( L4 )
Schottky Diode ( D1 )
the output voltage from 1.3V to 3..5V.
The
adjustable over current and short circuit protections
are also provided. The on resistance of the upper
N-channel MOSFET, R
, is used to sense the
ds(on)
voltage drop that proportional to output current, no
external low value sense resistor required. The
circuit scheme of the high current AIC1569A demo
board is as shown in Appendix A and the BOM list is
as shown in Appendix B. External high-speed
MOSFET drivers using NPN and PNP transistors are
58.5
Unit : °C
Note1: L2 and Q3 were not used in the
May 1997
1
AN005
measurements
Note2: Additional Schottky diode is recommended to
be used in parallel with D1 for improving temperature
on D1.
Gate Drive Signals
Fig. 2 U/L Gate Drive Signal
Fig. 1 U/L Gate Drive Signal
CH1
CH2
CH2
CH1
CH1:U
(Q1) V = 12.04V , V
=5.02V , V =1.63V
POWER CORE
GATE-GND
CC
CH2:L
(Q4) V
Load : 0 A
CORE
GATE-GND
Fig. 4 U/L Gate Drive Signal
Fig. 3 U/L Gate Drive Signal
CH2
CH1
CH1
CH2
CH1 : U
(Q1) V = 12.04V ,
CC
GATE-GND
V
=5.02V , V
=1.61V
POWER
CORE
CH2 : L
A
(Q4) V
Load : 10
CORE
GATE-GND
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AN005
Fig. 6 U/ZL Gate Drive Signal
Fig. 5 U/L Gate Drive Signal
CH1
CH2
CH2
CH1
CH1 : U
CH2 : L
(Q1)
(Q4)
V
= 12.04V , V
=5.02V , V
=1.59V
GATE-GND
CC
POWER
CORE
V
Load : 20 A
GATE-GND
CORE
Fig. 7 U/L Gate Drive Signal
Fig. 8 U/L Gate Drive Signal
CH2
CH1
CH2
CH1
CH1 : U
(Q1)
VCC = 12.04V , V =5.02V , V =1.58V
POWER CORE
GATE-GND
CH2 : L
(Q4)
V
Load : 30 A
CORE
GATE-GND
3
AN005
Soft Start
Fig. 10 Soft Start Test
Fig. 9 Soft Start Test
CH1 : U
(Q1)
CH1 : U
(Q1)
GATE-GND
GATE-GND
CH2 : SS Pin
CH2 : SS Pin
V Load : 30 A
CORE
V
CORE
Load : 0 A
Transient Response
Fig. 11 Transient response
CH1: V
(100mV/div)
CORE
CH2: I
(10A/div)
OUT
Status:
VCORE =1.6V , I
=2A to 20A
OUT
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AN005
VOUT Load Regulation
Fig. 12 Constant Load Regulation Waveform
Efficiency (VOUT=1.6V)
Fig. 13 Efficiency (VOUT=1.6V)
R1
C2
1000PF
R13
R2
VCC
10RJ
2.2KJ
C6
L1
C1
1UF
U1
VSEN
OCSET OVP
SS VCC
VID0 LGATE
PGND
BOOT
VID3 UGATE
VID4 PHASE
COMP PGOOD
Vpower
1
2
3
4
5
6
7
8
9
20
19
18
17
16
15
14
13
12
11
RT
Q1
Q2
R8
+
+
L2
L3
L4
0.1UF
CE4~6 CE1~3
JP0
1
R9
2
3
4
5
VID1
VID2
Vcore
Vcore set
C5
10
FB
GND
1.6V/30A
+
AIC1569A
D1
1N5820
Q3
Q4
Q5
CE7~16
R10
R11
R12
33PF
C4
R6
12V
12V
90.9KJ
1000PF
R7
15KJ
Q6
NPN
Q8
NPN
C3
Q7
PNP
Q9
PNP
0.1UF
R3
47KJ
R4
3.01KJ
R5
1.2MJ
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AN005
Appendix A: Application Circuit of the High Current aic1569A Demo Board
Appendix B: BOM List of the High Current AIC1569A Demo board
Part
Reference
QTY
PKG
Manufacturer
Remark
Number
AIC1569A
80N30L
FMMT618
FMMT718
1N5820
1mH
3.5mH
10W
2.2KW
47KW
3.01KW
1.2MW
90.9KW
15 KW
0W
1mF/16V
1000
PF/16V
0.1 UF/16V
1000
PF/16V
33 PF/16V
0.1mF/16V
1000
mF/6.3V
1000
mF/6.3V
2.54mm*5
U1
Q1,2,4,5
Q6,Q8
Q7,Q9
D1
L1
L3,4
R1
1pcs
4pcs
2pcs
2pcs
1pcs
1pcs
2pcs
1pcs
1pcs
1pcs
1pcs
1pcs
1pcs
1pcs
4pcs
1pcs
SO20
TO-263
SOT23
SOT23
AIC
Simens
Zetex
Zetex
N-FET
NPN
PNP
Schottky
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
R2
R3
R4
R5
R6
R7
R8,9,11,12
C1
C2
C3
C4
1pcs
1pcs
1pcs
SMD
SMD
SMD
C5
C6
1pcs
1pcs
SMD
SMD
CE1~6
6pcs
SANYO
SANYO
CE7~14
JP0
8pcs
1pcs
Appendix C: Test Equipment
Oscilloscope: LeCroy 9310C
Electronic load: Chroma 6301
Power Supply: Chroma 6210-40
Current probe: Tektronix AM503B
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