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參數(shù)資料
| 型號(hào)： | RT9237CS |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | MULTI-PHASE DC/DC CONTROLLER FOR CPU CORE POWER SUPPLY |
| 中文描述： | 多相DC / DC控制器的CPU內(nèi)核供電 |
| 文件頁(yè)數(shù)： | 11/15頁(yè) |
| 文件大小： | 323K |
| 代理商： | RT9237CS |
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Preliminary
RT9237
DS9237-00 January 2002
www.richtek-ic.com.tw
11
IMP
R
LC
2
π
kHz
8
CR
π
2
1
ESR
=
1
2
C
R
2
π
)
C
C
C
C
(
R
2
1
F
2
1
2
1
2
P
+
×
π
=
Design Example
Three phase converter V
CORE
= 1.5V, V
IN
= 12V, full
load current = 60Amp, droop voltage at full load =
120mV, OCP trip point for each power stage =
30Amp (at Sample/Hold), low side MOSFET R
DS(ON)
= 6m
at room temperature, L = 2
μ
H, C
OUT
=
9000
μ
F, capacitor ESR = 2m
.
1. Compensation setting
a. Modulator Gain, Pole and Zero
Modulator Gain = , saw-tooth wave
amplitude , choose R
IRMP
= 39K, V
RAMP
= 1.4V, modulator Gain = 8.6 =
18.7dB, LC filter pole = ,
ESR zero =
b. EA compensation network
Use type 2 compensation scheme (see Fig. 5),
, ,
mid-band gain = . Choose R
1
= 2.4K
, R
2
=
24K
, C
1
= 6.6nF, C
2
= 33pF, get F
Z
= 1KHz,
Fp = 200KHz, mid-band Gain=10=20dB,
modulator asymptotic Bode plot of EA
compensation and PWM loop Gain Bode
shown as Fig. 6.
Fig. 5 EA Compensation Network
Fig. 6 Asymptotic Bode Plot of PWM Loop Gain
2. Droop setting
Full load current of each power channel = 60A/3 =
20Amp, the ripple current =
I
L
=
V
5
1
H
2
μ
, load current at S/H = , GM
Amp S/H , suggested I
X
)
MAX
(
X
at full = 40
μ
A
50
μ
A, choose R
SP
= R
SN
= 2.7K
,
I
X(MAX)
= 40.8
μ
A, required Droop = 120mV =
40.8
μ
A
×
3
×
2/3
×
R
ADJ
，
R
ADJ
= 1.47K
.
Take the temperature rising for consideration, if
MOSFET working temperature=70
°
C and the
temperature coefficient =5000ppm/
°
C, the
R
DS(ON)
(70
°
C) = 6m
×
{1+(70
°
C-27
°
C)
×
5000ppm/
°
C} = 7.3 m
, R
ADJ
(70
°
C) = R
ADJ
(27
°
C)
×
{R
DS(ON)
(27
°
C)/R
DS(ON)
(70
°
C)} = 1.21K
3. Over Current Protection setting
OCP trip point current = 30A (at Sample/Hold)
，
3
R
，
R
IMAX
=13.6K
IMAX
R
Take the temperature rising for consideration,
R
IMAX
(70
°
C) = R
IMAX
(27
°
C)
×
{R
DS(ON)
(27
°
C)/R
DS(ON)
(70
°
C)} = 11.2K
4. SS capacitor
C
SS
= 0.1
μ
F is the suitable value for most
application.
V
R
Asymptotic Bode Plot of PWM Loop Gain
100
-60
-40
-20
0
20
40
60
80
10 100 1K 10K 100K 1M 10M
Frequency (Hz)
G
Uncompensated EA Gain
Compensated EA Gain
Modulator Gain
PWM Loop Gain
A
28
.
V
12
V
5
S
5
=
×
×
μ
I
SP
R
SP
)
ON
(
DS
X
V
6
2
A
30
R
I
×
=
×
=
+
_
EA
C
1
C
3
C
2
R
2
R
3
R
1
FB
DACOUT
V
CORE
COMP
R
3
, C
3
are used in type 3
compensation scheme (left
NC in type 2)
R
OL
R
OL
for no load offset
setting
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