參數(shù)資料
型號(hào)： IR3088A
廠(chǎng)商： International Rectifier
英文描述： XPHASETM PHASE IC WITH FAULT AND OVERTEMP DETECT
中文描述： XPHASETM相集成電路及超溫故障檢測(cè)
文件頁(yè)數(shù)： 15/34頁(yè)
文件大?。?/td> 1264K
代理商： IR3088A
IR3088A
SR
UP
is proportional to that of VDAC down-slope and is given by Equation (9), where I
SOURCE
is the source current
of VDAC pin as shown in Figure15 of IR3081 Data Sheet.
I
C
=
DOWN
SINK
VDAC
SR
(7)
2
15
10
2
5
VDAC
C
VDAC
R
+
=
(8)
VDAC
C
SOURCE
UP
I
SR
=
(9)
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 Equation
(10), 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
_
_
ROOM
L
MAX
L
T
R
R
+
=
The current sense amplifier gain of IR3088A decreases with temperature at the rate of 1470 ppm/°C, which
compensates part of the inductor DCR increase. The phase IC die temperature is only a couple of degrees Celsius
higher than the PCB temperature due to the low thermal impedance of MLPQ package. The minimum current sense
amplifier gain at the maximum phase IC temperature T
IC_MAX
is calculated from Equation (11).
(
10
*
1470
1
_
_
ROOM
CS
MIN
CS
G
G
=
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 currents flowing through the current
sense resistors R
CS+
and R
CS-
.
+
=
CSIN
CS
CSIN
OFST
CS
TOFST
CS
I
R
I
V
V
_
_
The over current limit is set by the external resistor R
OCSET
as defined in Equation (13), where I
LIMIT
is
the required
over current limit. I
OCSET,
the bias current of OCSET pin, changes with switching frequency setting resistor R
OSC
and is determined by the curve in Figure 14 of IR3081 Data Sheet. K
P
is the ratio of inductor peak current over
average current in each phase and is calculated from Equation (14).
I
R
)
1
[
_
+
+
=
)]
_
6
ROOM
MAX
L
T
(10)
)]
_
6
ROOM
MAX
IC
T
T
(11)
+
+
CS
R
(12)
OCSET
MIN
CS
TOFST
CS
P
MAX
L
LIMIT
n
OCSET
I
G
V
K
R
/
]
_
_
(13)
n
I
f
V
L
/
V
V
V
(
K
O
SW
I
O
O
I
P
)
/(
)
=
(14)
No Load Output Voltage Setting Resistor
R
FB
and Adaptive Voltage Positioning Resistor
R
DRP
A resistor between FB pin and the converter output is used to create output voltage offset V
O_NLOFST,
which is the
difference between V
DAC
voltage and output voltage at no load condition. Adaptive voltage positioning further
lowers the converter voltage by R
O
*I
O,
where R
O
is the
required
output impedance of the converter.
R
FB
is not only determined by I
FB
, the current flowing out of FB pin as shown in Figure 14 of IR3081 Data Sheet, but
also affected by the adaptive voltage positioning resistor R
DRP
and total input offset voltage of
current sense
amplifiers. R
FB
and R
DRP
are determined by (15) and (16) respectively.
Page 15 of 34
9/30
/04
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IR3088AMTR 功能描述:IC XPHASE W/FAULT DET 20L-MLPQ RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 電源管理 - 專(zhuān)用 系列:XPhase™ 應(yīng)用說(shuō)明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類(lèi)型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件
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