參數(shù)資料
型號(hào)： IR3500MTRPBF
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)： 32/47頁(yè)
文件大?。?/td> 778K
代理商： IR3500MTRPBF
IR3500
Page 32 of 47
June 12, 2007
No Load Output Voltage Setting Resistor
R
VSETPT
,
A resistor between VSETPT pin and VDAC 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. R
VSETPT
is determined by (17), where
I
VSETPT
is the current flowing out of VSETPT pin as shown in Figure 23.
V
R
=
VSETPT
I
NLOFST
O
VSETPT
_
(17)
VCCL Capacitor
C
VCCL
The capacitor is selected based on the stability requirement of the linear regulator and the load current to be
driven. The linear regulator supplies the bias and gate drive current of the phase ICs. A 4.7uF normally ensures
stable VCCL performance for Intel VR11 and AMD applications.
VCCL Programming Resistor
R
VCCLFB1
and
R
VCCLFB2
Since VCCL voltage is proportional to the MOSFET gate driver loss and inversely proportional to the
MOSFET conduction loss, the optimum voltage should be chosen to maximize the converter efficiency. VCCL
linear regulator consists of an external NPN transistor, a ceramic capacitor and a programmable resistor
divider. Pre-select R
VCCLFB1
, and calculate R
VCCLFB2
from (18).
19
.
*
1
2
VCCL
VCCL Regulator Drive Resistor
R
VCCLDRV
The drive resistor is primarily dependent on the load current requirement of the linear regulator and the
minimum input voltage requirements. The following equation gives an estimate of the average load current of
the switching phase ICs.
[
mA
f
Q
Q
I
sw
gt
gb
avg
drive
+
+
=
10
)
(
_
Q
gb
and Q
gt
are the gate charge of the top and bottom FET. For a minimum input voltage and a maximum
VCCL, the maximum R
VCCLDRV
required to use the full pull-down current of the VCCL driver is given by
7
(min)
I
VCCLDRV
I
19
.
=
R
R
VCCLFB
VCCLFB
(18)
]
n
(19)
min
_
/
(max)
β
avg
drive
VCCL
V
R
=
(20)
Due to limited pull down capability of the VCCLDRV pin, make sure the following condition is satisfied.
VCCL
V
I
(min)
7
(max)
mA
R
VCCLDRV
10
<
(21)
In the above equation, V
I
( min) and V
I
( max) is the minimum and maximum anticipated input voltage. If the
above condition is not satisfied there is a need to use a device with higher
β
min
or Darlington configuration can
be used instead of a single NPN transistor.
Thermistor
R
THERM
and Over Temperature Setting Resistors
R
HOTSET1
and
R
HOTSET2
The threshold voltage of VRHOT comparator is fixed at 1.6V, and a negative temperature coefficient (NTC)
thermistor R
THERM
is required to sense the temperature of the power stage. If we pre-select R
THERM
, the NTC
thermistor resistance at allowed maximum temperature T
MAX
is calculated from (22).
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
IR3500V 制造商:IRF 制造商全稱(chēng):International Rectifier 功能描述:XPHASE3TM VR11.1 CPU VTT CONTROL IC
IR3500VMPBF 制造商:IRF 制造商全稱(chēng):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(chēng):International Rectifier 功能描述:XPHASE3TM CONTROL IC
IR3502_09 制造商:IRF 制造商全稱(chēng):International Rectifier 功能描述:XPHASE3TM CONTROL IC
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