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| 型号： | IR3500 |
| 厂商： | International Rectifier |
| 英文描述： | XPHASE3TM VR11.0 & AMD PVID CONTROL IC |
| 中文描述： | XPHASE3TM VR11.0 |
| 文件页数： | 31/47页 |
| 文件大小： | 778K |
| 代理商： | IR3500 |
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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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相关代理商/技术参数 |
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|---|---|
| IR3500A | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM VR11.0 & AMD PVID CONTROL IC |
| IR3500AMPBF | 功能描述:IC CTRL XPHASE3 VR11.0 32-MLPQ RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:XPhase3™ 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
| IR3500AMTRPBF | 功能描述:开关变换器、稳压器与控制器 IR3500 IC xPHASE3 AMD PVID CTRL IC RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| IR3500MPBF | 功能描述:IC XPHASE3 CONTROL 32-MLPQ RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:XPhase3™ 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
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