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(yè)數(shù)： 37/47頁(yè)
文件大?。?/td> 778K
代理商： IR3500MPBF
IR3500
Page 37 of 47
June 12, 2007
No Load Output Voltage Setting Resistor
R
VSETPT
and Adaptive Voltage Positioning Resistor
R
DRP
From Figure 24, the bias current of VSETPT pin is 11.9uA with R
OSC
=50k
.
10
*
10
_
TOFST
CS
VSETPT
I
=
=
=
840
10
*
9
11
6
3
VSETPT
V
R
, choose R
VSETPT
=825
.
VCCL Programming Resistor
R
VCCLFB1
and
R
VCCLFB2
Choose VCCL=7V to maximize the converter efficiency. Pre-select R
VCCLFB1
=20k
, and calculate R
VCCLFB2.
3
1
2
=
=
=
k
VCCL
R
R
VCCLFB
VCCLFB
05
.
19
.
7
19
.
*
10
*
20
19
.
19
.
*
VCCL Drive Resistor
R
VCCLDRV
The maximum drive current for the linear regulator is dependent on the type of MosFET used. For this
example its assumed that IR6622/ IRF6691 are used as buck switches.
[
n
n
I
avg
drive
250
)
11
47
(
_
+
=
The minimum input voltage is assumed to be 10 V and VCCL is fixed at 6.5V for this design.
=
mA
50
/
75
]
mA
mA
k
75
3
10
=
+
(19)
=
k
V
V
V
R
VCCLDRV
8
5
7
10
(20)
Assuming the maximum input voltage to as 14 V,
mA
mA
3
k
V
10
8
5
7
14
<
=
(21)
Thermistor
R
THERM
and Over Temperature Setting Resistors
R
HOTSET1
and
R
HOTSET2
Choose NTC thermistor R
THERM
=2.2k
, which has a constant of B
THERM
=3520, and the NTC thermistor
resistance at the allowed maximum temperature T
MAX
is,
1
1
(
*
[
*
_
_
T
T
ROOM
MAX
L
Select R
HOTSET2
= 931
to linearize the NTC, which has non-linear characteristics in the operational temperature
range. Then calculate R
HOTSET1
corresponding to the allowed maximum temperature TMAX.
+
=
=
R
HOTSET
6
R
HOTSET1
=3.65k
.
=
+
+
=
=
142
)]
25
273
1
115
273
1
(
*
3520
[
*
10
*
2
)]
3
EXP
B
EXP
R
R
THERM
THERM
TMAX
=
+
k
VCCL
(
R
R
HOTSET
TMAX
63
.
6
)
7
*
)
931
142
(
)
*
)
(
2
1
,
choose
VOLTAGE LOOP COMPENSATION
Type II compensation is used for the converter with Polymer output capacitors. Choose the crossover frequency
fc=25kHz, which is 1/10 of the switching frequency per phase, and determine Rcp and C
CP
.
Pre-select R
FB
=2.00k
, and calculate R
DRP
, R
CP
and C
CP
.
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PDF描述
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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(kāi)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(kāi)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(kāi)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(kāi)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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