参数资料
| 型号： | ISL6334BIRZ-T |
| 厂商： | Intersil |
| 文件页数： | 23/30页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM SYNC BUCK 40-QFN |
| 标准包装： | 4,000 |
| 应用： | 控制器，Intel VR11.1 |
| 输入电压： | 3 V ~ 12 V |
| 输出数： | 1 |
| 输出电压： | 0.5 V ~ 1.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 供应商设备封装： | 40-QFN（6x6） |
| 包装： | 带卷 (TR) |
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ISL6334B, ISL6334C
100
90
80
70
60
50
40
30
Temperature Compensation
The ISL6334B, ISL6334C supports inductor DCR sensing,
or resistive sensing techniques. The inductor DCR has a
positive temperature coefficient, which is about +0.385%/°C.
Since the voltage across inductor is sensed for the output
current information, the sensed current has the same
positive temperature coefficient as the inductor DCR.
In order to obtain the correct current information, there
should be a way to correct the temperature impact on the
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0
20
40
60
80
100
120
140
current sense component. ISL6334B, ISL6334C provides
two methods: integrated temperature compensation and
TEMPERATURE (°C)
FIGURE 13. THE RATIO OF TM VOLTAGE TO NTC
TEMPERATURE WITH RECOMMENDED PARTS
We recommend using those resistors for the accurate
temperature compensation.
There is an comparator with hysteresis to compare the TM
pin voltage to the fixed threshold for the VR_HOT signal.
The VR_HOT signal is set to high when the TM voltage goes
below 33.3% of VCC voltage, and is pulled to GND when the
external temperature compensation.
Integrated Temperature Compensation
When the TCOMP voltage is equal or greater than VCC/15,
ISL6334B, ISL6334C will utilize the voltage at TM and
TCOMP pins to compensate the temperature impact on the
sensed current. The block diagram of this function is shown
in Figure 15.
TM voltage goes back to above 39.1% of VCC voltage.
Figure 14 shows the operation of those signals.
V CC
I sen4
TM
R TM1
TM
NON-LINEAR
A/D
CHANNEL
CURRENT
SENSE
I sen3
I sen2
I sen1
0.391*Vcc
0.333*Vcc
o
c
R NTC
I 4
I 3
I 2
I 1
VR_HOT
TEMPERATURE
V CC
R TC1
D/A
k i
T2
T3
TCOMP
4-BIT
DROOP AND
FIGURE 14. VR_HOT SIGNAL vs TM VOLTAGE
Based on the NTC temperature characteristics and the
desired threshold of the VR_HOT signal, the pull-up resistor
R TC2
A/D
OVERCURRENT
PROTECTION
RTM1 of TM pin is given by Equation 18:
FIGURE 15. BLOCK DIAGRAM OF INTEGRATED
R TM1 = 2.75xR NTC ( T3 )
(EQ. 18)
TEMPERATURE COMPENSATION
When the TM NTC is placed close to the current sense
R NTC(T3) is the NTC resistance at the VR_HOT threshold
temperature T3.
The NTC resistance at the set point T2 can be calculated as
shown in Equations 19:
component (inductor), the temperature of the NTC will track
the temperature of the current sense component. Therefore
the TM voltage can be utilized to obtain the temperature of
the current sense component.
Based on VCC voltage, ISL6334B, ISL6334C converts the
R NTC ( T2 ) = 1.267xR NTC ( T3 )
(EQ. 19)
TM pin voltage to a 6-bit TM digital signal for temperature
compensation. With the non-linear A/D converter of
With the NTC resistance value obtained from Equations 18
and 19, the temperature value T3 and T2 can be found from
the NTC datasheet.
23
ISL6334B, ISL6334C, the TM digital signal is linearly
proportional to the NTC temperature. For accurate
temperature compensation, the ratio of the TM voltage to the
NTC temperature of the practical design should be similar to
that in Figure 13.
FN6689.2
August 31, 2010
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相关代理商/技术参数 |
参数描述 |
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| ISL6334CCRZ | 功能描述:IC CTRLR PWM SYNC BUCK 40-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ISL6334CCRZ-T | 功能描述:IC CTRLR PWM SYNC BUCK 40-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ISL6334CIRZ | 功能描述:IC CTRLR PWM SYNC BUCK 40-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
| ISL6334CIRZ-T | 功能描述:IC CTRLR PWM SYNC BUCK 40-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ISL6334CRZ | 功能描述:IC CTRLR PWM 4PHASE BUCK 40-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
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