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參數(shù)資料
| 型號(hào)： | IR3500MPBF |
| 廠商： | International Rectifier |
| 英文描述： | XPHASE3TM VR11.0 & AMD PVID CONTROL IC |
| 中文描述： | XPHASE3TM VR11.0 |
| 文件頁數(shù)： | 31/47頁 |
| 文件大?。?/td> | 778K |
| 代理商： | IR3500MPBF |
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IR3500
Page 31 of 47
June 12, 2007
The soft start delay time (TD1) and VR ready delay time (TD3) are determined by (8) to (9) respectively.
4
*
1
=
=
CHG
I
)
0
*
3
=
=
CHG
I
Once C
SS/DEL
is chosen, the minimum over-current fault latch delay time
t
OCDEL
is fixed and can be quantified as
12
.
*
=
=
OCDEL
I
6
/
/
10
*
5
52
4
*
DEL
SS
DEL
SS
C
C
TD
(8)
6
/
/
10
*
5
52
)
0
*
O
DEL
SS
O
DEL
SS
V
C
V
C
TD
(9)
6
/
/
10
*
55
12
.
*
DEL
SS
DISCHG
DEL
SS
C
C
t
(10)
VDAC Slew Rate Programming Capacitor
C
VDAC
and Resistor
R
VDAC
The slew rate of VDAC down-slope SR
DOWN
can be programmed by the external capacitor C
VDAC
as defined in
(11), where I
SINK
is the sink current of VDAC pin. The slew rate of VDAC up-slope is the same as that of down-
slope. The resistor R
VDAC
is used to compensate VDAC circuit and can be calculated as follows
6
10
*
44
=
=
DOWN
DOWN
SINK
VDAC
C
SR
SR
I
(11)
2
15
10
2
5
VDAC
C
VDAC
R
+
=
(12)
Over Current Setting Resistor
R
OCSET
The inductor DC resistance is utilized to sense the inductor current. The copper wire of inductor has a constant
temperature coefficient of 3850 ppm/°C, and therefore the maximum inductor DCR can be calculated from (13),
where R
L_MAX
and R
L_ROOM
are the inductor DCR at maximum temperature T
L_MAX
and room temperature
T_
ROOM
respectively.
+
=
)]
(
10
*
3850
1
_
6
_
_
ROOM
MAX
L
ROOM
L
MAX
L
T
T
R
R
(13)
The total input offset voltage (V
CS_TOFST
) of current sense amplifier in phase ICs is the sum of input offset
(V
CS_OFST)
of the amplifier itself and that created by the amplifier input bias current flowing through the current
sense resistor R
CS
.
R
I
V
V
+
=
+
_
_
The over-current limit is set by the external resistor R
OCSET
and is given by (15). In a multiphase architecture the
peak to peak ripple of the net inductor current is much smaller than the stand alone phase due to interleaving.
The ratio of the peak to average current in this case can be approximated using (16).
I
R
1
[
_
+
=
CS
CSIN
OFST
CS
TOFST
CS
(14)
OCSET
CS
TOFST
CS
P
MAX
L
LIMIT
n
OCSET
I
G
V
K
R
/
]
)
_
+
(15)
(
)
)
1
2
/
)
1
(
)
(
)
1
D
D
f
L
n
I
D
n
m
n
m
D
n
D
D
V
K
sw
LIMIT
I
P
+
=
(16)
Where; I
LIMIT
=Over current limit, n=Number of phases, K
P
=Ratio of the peak to average current for the inductor,
G
CS
=Gain of the current sense amplifier, I
OCSET
= Determined by the ROSC and given by Figure 24,
D=Vo/V
I
, m=Maximum integer that doesn’t exceed (n*D)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IR3500MTRPBF | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 COMPLETE VR11.0 OR AMD PVID PWR SOLTION RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| IR3500V | 制造商:IRF 制造商全稱:International Rectifier 功能描述:XPHASE3TM VR11.1 CPU VTT CONTROL IC |
| IR3500VMPBF | 制造商:IRF 制造商全稱:International Rectifier 功能描述:XPHASE3TM VR11.1 CPU VTT CONTROL IC |
| IR3500VMTRPBF | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 X-PHASE IR3500V AMD SVID CTRL IC RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| IR3502 | 制造商:IRF 制造商全稱:International Rectifier 功能描述:XPHASE3TM CONTROL IC |
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