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參數(shù)資料
| 型號(hào)： | RT8800PS |
| 廠商： | Richtek Technology Corporation |
| 英文描述： | General Purpose 2/3-Phase PWM Controller for High-Density Power Supply |
| 中文描述： | 通用2/3-Phase PWM控制器，用于高密度電源 |
| 文件頁數(shù)： | 15/26頁 |
| 文件大小： | 546K |
| 代理商： | RT8800PS |
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RT8800/B
15
DS8800/B-06 March 2007
www.richtek.com
All brand name or trademark belong to their owner respectively
DAC Design Guideline
In high temperature environment, V
CORE
becomes
unstable for the leakage current in VID
pins is increasing.
The leakage will increase current consumption of CPU,
and then raise RT8800's V
DACQ
reference output, so does
V
CORE
voltage. Below are four comparison charts for
different CPUs.
Note: In Below Figure 2 to Figure 5, The Original R means
the resister values shown in typical application circuit.
R=1/3 and R=1/9 mean that The Original R is divided
by 3 or 9.
Figure 5
Figure 4
V
CORE
vs. Temperature
1.335
1.34
1.345
1.35
1.355
1.36
1.365
1.37
1.375
1.38
30
35
40
45
50
55
(
°
C)
60
65
70
Temperature
V
C
CPU : P4-2.8G
V
CORE
= 1.35V
R = 1/9
R = 1/3
The Original R
Figure 3
Figure 2
changing the output voltage. Adjusting the output voltage
during operation may trigger the over-voltage protection.
The DAC function is a precision non-inverting summation
amplifier shown in Figure 1. The resistor values shown
are only approximations of the actual precision values
used. Grounding any combination of the V
ID
pins increases
the DACQ voltage. The
“
open
”
circuit voltage on the V
ID
pins is the band gap reference voltage (V
REF
= 0.8V).
+
-
V
(0.8V)
V
DACFB
OP
V
DACQ
RF
RG
VID0
VID1
VID2
VID3
VID4
VID5
R
R
R
R
R
R
Figure 1. The Structure of Discrete DAC Generator
V
CORE
vs. Temperature
1.54
1.55
1.56
1.57
1.58
1.59
1.6
1.61
1.62
1.63
1.64
30
35
40
45
Temperature
50
55
(
°
C)
60
65
70
V
C
CPU : P4-3.2G
V
CORE
= 1.55V
R = 1/9
R = 1/3
The Original R
V
CORE
vs. Temperature
1.54
1.56
1.58
1.6
1.62
1.64
1.66
1.68
30
35
40
45
50
55
(
°
C)
60
65
70
Temperature
V
C
CPU : P4-3.06G
V
CORE
= 1.55V
R = 1/9
R = 1/3
The Original R
V
CORE
vs. Temperature
1.52
1.54
1.56
1.58
1.6
1.62
1.64
1.66
30
35
40
45
50
55
(
°
C)
60
65
70
Temperature
V
C
CPU : Celeron 2.0G
V
CORE
= 1.55V
R = 1/9
R = 1/3
The Original R
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