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參數(shù)資料
| 型號： | TDA21302 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | Multi-Phase PWM Controller for CPU Core Power Supply |
| 中文描述： | 多相PWM控制器，電源為CPU內(nèi)核電源 |
| 文件頁數(shù)： | 20/25頁 |
| 文件大?。?/td> | 588K |
| 代理商： | TDA21302 |
CoreControl
TM
Page 20 of 25
DS-CoreControl-TDA21302
2. Droop & DAC Offset Setting
For each channel the load current is 100A / 4 = 25A and the ripple current,
I
L
, is given as
= 6,65 A
The load current, IL, at S/H is 25A - = 21,675 A.
Using the following formula to select the appropriate I
X(MAX)
for the S/H of GM amplifier :
The suggested I
X
is in the range of 50 uA
±
5uA, select R
SP
= R
SN
= 1,5 K
, then I
X(MAX)
would be 43,35
uA. V
DROOP
= 100 mV = 43,35 uA X 2 X 4 X R
ADJ
, therefore R
ADJ
= 287
.
The R
DS(ON)
of MOSFET varies with temperature rise. When the Sync FETs are working at 100°C
junction temperature, the R
DS(ON)
of MOSFET at 100°C is given as 7,3 m
. So the R
ADJ
at 100°C is
given as :
R
ADJ_100°C
X ( R
DS(ON)_25°C
/ R
DS(ON)_100°C
) = 236
3. Over Current Protection Setting
OCP trip point is internally set at around 100 uA of I
X
for each channel. As above selected R
SP
= R
SN
=
1,5 K
, the OCP trip point is found using :
SP
R
4. Soft-start Capacitor Selection
C
SS
= 100 nF is the suitable value for most application.
SS
C
= 65 nF
1,35V
135V
I
×
DS(ON)
X(MAX) =
SP
R
21,675A
I
R
×
×
15K
=
=
DS(ON)
R
L(TRIP)
L(TRIP)
(OCP)
Ix
I
3m
I
=
100uA
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
I
t
I
t
= V
C
C
=
V
I
= 13 uA , V
= 2V , t
= 10 mS
×
×
×
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