Convertidor Dc A Dc
Páginas: 32 (7924 palabras)
Publicado: 2 de febrero de 2013
-1-
IRAUDPS1
12V System Scalable 250W to1000W Audio Power Supply
For Class D Audio Power Amplifiers
Using the IR2085 self oscillating gate driver
And Direct FETS IRF6648
By
Manuel Rodríguez
CAUTION:
International Rectifier suggests the following guidelines for safe operation and handling of
IRAUDPS1 Demo Board:
• Always wear safety glasses whenever operating Demo Board
• Avoidpersonal contact with exposed metal surfaces when operating Demo Board
• Turn off Demo Board when placing or removing measurement probes
www.irf.com
IRAUDPS1
Page 1 of 35
-2-
Page
Table of Contents
Item
1
Introduction
3
2
System Specifications
4
3
Functional Block Description
5
4
IRAUDPS1 Block Diagram
6
5
Schematic IR2085 module
76
IRAUDPS1 mother board schematic
8
7
IR2085 module PCB layout
9
8
IRAUDPS1 mother PCB layout
10-11
9
BOM of IR2085 module
12
10
BOM of IRAUDPS1 mother board
13-14
11
BOM of Mechanical parts
14
12
Scalable IRAUDPS1 power table
14
13
Performance and test procedure
15-21
14
IRAUDPS1 Fabrication Drawings
22-24
15Transformer winding instructions
25-27
16
Design example
28
17
Transformer design
28-30
18
MOSFET selection
30
19
Switching losses
31
20
Efficiency calculations
32
21
Frequency of oscillation
33
22
Selecting dead time
33
23
Over Temperature Protection
33
24
Short circuit protection
33
25
BJT gate driver option33
26
Music Load
34
25
Revision Changes Descriptions
35
www.irf.com
IRAUDPS1
Page 2 of 35
-3-
Introduction
The IRAUDPS1 reference design is a 12 volts systems Audio Power Supply for automotive applications
designed to provide voltage rails (+B and –B) for Class D audio power amplifiers
This reference design demonstrates how to use the IR2085 as PWM and gatedriver for a Push-Pull DC to
DC converter, along with IR’s Direct FETS IRF6648
The resulting design uses a compact design with the Direct FETS and provides all the required protections.
NOTE: The IRAUDPS1 is an scalable power output design, and unless otherwise noted,
this user’s manual and the reference design board is the 500W
Table 1 IRAUDPS1 scalable table
IRAUDPS1
250W
NominalVoltage
output
Nominal
Output
Current
500W
1000W
+B, -B
±35V
±35V
±35V
+B, -B
3.5A
7A
14A
Stereo System
8 channel System
8 channel System
100W x 2
100W x 4
100W x 8
IR Class D Model
IRAUDAMP7D
IRAUDAMP8
IRAUDAMP8 x 2
Detailed output power versions that can be configured by replacing components given in
the component selection of Table 7 on page 14Application
.
www.irf.com
IRAUDPS1
Page 3 of 35
-4-
System Specification
All specs and tests are based on a 14.4V battery voltage supplying an International Rectifier Class
D reference design with all channels driven at 1 kHz and a resistive load.
Table 2
Specification
IR Class D Load
Input current with no load
ACC Remote ON Level
ACC input impedance
Turn ON delay
In-RushCurrent
Output power full loaded
Input current full loaded
Output Current per supply
Output voltage
Regulation
Ripple outputs, laded at
400W audio 1khz
250W
IRAUDAMP5
0.35A +/- 10%
4.5-6V
10k+/- 10%
1-1.5 Sec
30A Max
250W
18A
3.5A
+/- 35V +/-10%
+/- 10%
1.5V P.P.
IRAUDPS1
IRAUAMP8
0.35A +/- 10%
4.5-6V
10k+/- 10%
1-1.5 Sec
30A Max
500W
35.5A
7A
+/- 35V +/-10%
+/-10%
1.8V P.P.
1000W
IRAUAMP8 x 2
0.35A +/- 10%
4.5-6V
10k+/- 10%
1-1.5 Sec
30A Max
1000W
71A
14A
+/- 35V +/-10%
+/- 15%
2V P.P.
Efficiency at ½ and full of
rated power
Isolation between Battery
and Outputs Gnd
Battery OVP
Battery UVP
Output SCP
Outputs OVP
Over temperature
protection (OTP)
OTP hysteresis
Led Indicators
Size
90-85%
92-87%
90-80%
1k Ohm...
IRAUDPS1
12V System Scalable 250W to1000W Audio Power Supply
For Class D Audio Power Amplifiers
Using the IR2085 self oscillating gate driver
And Direct FETS IRF6648
By
Manuel Rodríguez
CAUTION:
International Rectifier suggests the following guidelines for safe operation and handling of
IRAUDPS1 Demo Board:
• Always wear safety glasses whenever operating Demo Board
• Avoidpersonal contact with exposed metal surfaces when operating Demo Board
• Turn off Demo Board when placing or removing measurement probes
www.irf.com
IRAUDPS1
Page 1 of 35
-2-
Page
Table of Contents
Item
1
Introduction
3
2
System Specifications
4
3
Functional Block Description
5
4
IRAUDPS1 Block Diagram
6
5
Schematic IR2085 module
76
IRAUDPS1 mother board schematic
8
7
IR2085 module PCB layout
9
8
IRAUDPS1 mother PCB layout
10-11
9
BOM of IR2085 module
12
10
BOM of IRAUDPS1 mother board
13-14
11
BOM of Mechanical parts
14
12
Scalable IRAUDPS1 power table
14
13
Performance and test procedure
15-21
14
IRAUDPS1 Fabrication Drawings
22-24
15Transformer winding instructions
25-27
16
Design example
28
17
Transformer design
28-30
18
MOSFET selection
30
19
Switching losses
31
20
Efficiency calculations
32
21
Frequency of oscillation
33
22
Selecting dead time
33
23
Over Temperature Protection
33
24
Short circuit protection
33
25
BJT gate driver option33
26
Music Load
34
25
Revision Changes Descriptions
35
www.irf.com
IRAUDPS1
Page 2 of 35
-3-
Introduction
The IRAUDPS1 reference design is a 12 volts systems Audio Power Supply for automotive applications
designed to provide voltage rails (+B and –B) for Class D audio power amplifiers
This reference design demonstrates how to use the IR2085 as PWM and gatedriver for a Push-Pull DC to
DC converter, along with IR’s Direct FETS IRF6648
The resulting design uses a compact design with the Direct FETS and provides all the required protections.
NOTE: The IRAUDPS1 is an scalable power output design, and unless otherwise noted,
this user’s manual and the reference design board is the 500W
Table 1 IRAUDPS1 scalable table
IRAUDPS1
250W
NominalVoltage
output
Nominal
Output
Current
500W
1000W
+B, -B
±35V
±35V
±35V
+B, -B
3.5A
7A
14A
Stereo System
8 channel System
8 channel System
100W x 2
100W x 4
100W x 8
IR Class D Model
IRAUDAMP7D
IRAUDAMP8
IRAUDAMP8 x 2
Detailed output power versions that can be configured by replacing components given in
the component selection of Table 7 on page 14Application
.
www.irf.com
IRAUDPS1
Page 3 of 35
-4-
System Specification
All specs and tests are based on a 14.4V battery voltage supplying an International Rectifier Class
D reference design with all channels driven at 1 kHz and a resistive load.
Table 2
Specification
IR Class D Load
Input current with no load
ACC Remote ON Level
ACC input impedance
Turn ON delay
In-RushCurrent
Output power full loaded
Input current full loaded
Output Current per supply
Output voltage
Regulation
Ripple outputs, laded at
400W audio 1khz
250W
IRAUDAMP5
0.35A +/- 10%
4.5-6V
10k+/- 10%
1-1.5 Sec
30A Max
250W
18A
3.5A
+/- 35V +/-10%
+/- 10%
1.5V P.P.
IRAUDPS1
IRAUAMP8
0.35A +/- 10%
4.5-6V
10k+/- 10%
1-1.5 Sec
30A Max
500W
35.5A
7A
+/- 35V +/-10%
+/-10%
1.8V P.P.
1000W
IRAUAMP8 x 2
0.35A +/- 10%
4.5-6V
10k+/- 10%
1-1.5 Sec
30A Max
1000W
71A
14A
+/- 35V +/-10%
+/- 15%
2V P.P.
Efficiency at ½ and full of
rated power
Isolation between Battery
and Outputs Gnd
Battery OVP
Battery UVP
Output SCP
Outputs OVP
Over temperature
protection (OTP)
OTP hysteresis
Led Indicators
Size
90-85%
92-87%
90-80%
1k Ohm...
Leer documento completo
Regístrate para leer el documento completo.