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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： | 32/47页 |
| 文件大小： | 778K |
| 代理商： | IR3500 |
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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 |
| IR3500MTRPBF | 功能描述:开关变换器、稳压器与控制器 COMPLETE VR11.0 OR AMD PVID PWR SOLTION 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 |
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