参数资料
型号: P95020ZLLGI
厂商: INTEGRATED DEVICE TECHNOLOGY INC
元件分类: 电源管理
英文描述: 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, PBGA124
封装: LLGA-124
文件页数: 132/137页
文件大小: 3533K
代理商: P95020ZLLGI
P95020 / Preliminary Datasheet
Revision 0.7.10
94
2010 Integrated Device Technology, Inc.
11.2 CLASS_D
– TYPICAL PERFORMANCE CHARACTERISTICS
ClassD Efficiency into 4 Ohm
40
45
50
55
60
65
70
75
80
85
90
0.0
0.5
1.0
1.5
2.0
2.5
Output Power (W)
E
ff
ic
ie
n
c
y
(%
)
"ClassD Efficiency"
Figure 27
Clss D BTL Efficiency vs Outpout Power (4 ohm speaker)
11.3 CLASS_D
– REGISTER SETTINGS
Register pair (0x8A, 0x8C) and register pair (0x8B, 0x8D) control and monitor the CLASS_D BTL Power Output Stage.
Each half-bridge can be programmed by writing 8-bit control words to these registers.
Both Registers in each pair must be programmed identically. The Base addresses are defined in Table 3 – Register
Address Global Mapping on page 20. The offset addresses are defined as Base Address in the following table.
11.3.1
CLASS_D - Control Registers:
This Register pair contains Enable, Short Circuit Threshold and Dead-Time settings. They must be set identically.
IC Address = Page-0: 138(0x8A), C Address = 0xA08A
IC Address = Page-0: 140(0x8C), C Address = 0xA08C
Bit
Bit Name
Def.
Set.
User
Type
Value
Description / Comments
[1:0]
RESERVED
01b
RW
RESERVED
[3:2]
SCTHR_CLASS_D
01b
RW
Short Circuit Threshold
[6:4]
RESERVED
000b
RW
RESERVED
7
ENABLE_CLASS_D
0b
RW
1 = Enable
0 = Disable
Master Enable
Table 27
Peak Short Circuit Detect Level Settings for Bits [3:2]
Bit 3
Bit 2
Description
0
Short Circuit Threshold = 10% of F/S Voltage
0
1
Short Circuit Threshold = 14% of F/S Voltage
1
0
Short Circuit Threshold = 16% of F/S Voltage
1
Short Circuit Threshold = 20% of F/S Voltage
Note
Short Circuit detect threshold is set as a percentage of full scale output voltage.
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