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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)： | 14/25頁 |
| 文件大?。?/td> | 588K |
| 代理商： | TDA21302 |
CoreControl
TM
Page 14 of 25
DS-CoreControl-TDA21302
Phase Setting and Converter Start Up
The TDA21302 interfaces with companion MOSFET drivers, TDA21106 ( Single Channel ) and
TDA21102 ( Dual Channel ), for correct converter initialization. The tri-state PWM output pins sense the
interface voltage at IC POR period ( both VCC and DVD trip ). The channel is enabled if the voltage at
the pin is 1,2V less than VCC. Please tie the PWM outputs to VCC and the current sense pins to GND
or leave them floating if the channel is unused. For 3 Phase application, connect PWM4 high.
Current Sensing Setting
TDA21302 senses the current of the Sync FET in each phase when it is conducting for channel balance
and droop tuning. The differential sensing GM amplifier converts the voltage on the sense components
which can be sense resistors or the Rds(on) of the Sync FET to current signal into internal balance
circuit.
Basic Theory
The sensing circuit gets by local feedback. R
SP
= R
SN
to cancel the voltage drop caused by
X
R
GM amplifier input bias current. I
X
is sampled and held just before low side MOSFET turns off.
Therefore,
I
I
P
P
E
E
A
A
K
K
I
I
v
v
a
a
l
l
l
l
e
e
y
y
I
I
I
I
A
A
V
V
G
G
Differential Current
GM Amplifier
ISP1
ISN1
Sample
& Hold
I
X1
I
X1
2I
X1
Current
Balance
Droop
OCP
I
X1
I
BP
I
BP
R
SP1
R
SN1
R
DS(on)1
I
I
L
L
1
1
BP
SN1 ,
R
BP
X1
SP1
L1_VALLEY
DS(on)1
R
DS(on)1
R
R
SN1
SP1
X1
L1_VALLEY
SP1
V
I
V
(I
+I
) R
I
V
V
and R
R
I
I
+
+
=
×
=
×
=
=
∴
=
×
∵
O
OFF
T
V
I=
L
×
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