参数资料
| 型号： | ISL6263DHRZ-T |
| 厂商： | Intersil |
| 文件页数： | 14/17页 |
| 文件大小： | 0K |
| 描述： | IC VREG 3BIT 1PHASE 32-QFN |
| 标准包装： | 6,000 |
| 应用： | 转换器，GPU 内核电源 |
| 输入电压： | 5 V ~ 25 V |
| 输出数： | 1 |
| 输出电压： | 0.7 V ~ 1.09 V |
| 工作温度： | -10°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN（5x5） |
| 包装： | 带卷 (TR) |
ISL6263D
L ? R N ( T ) ? R S ? (EQ. 10)
? R N ( T ) + R S ?
? ------------- ?
? R N ( T ) ? R S ?
? R N ( T ) + R S ?
G 1 ( T ) = -------------------------------
G 1 ( T ) ? ( 1 + 0.00393 ? ( T – 25 ° C ) ) ? G 1t arg et
G 1 ( T ) = ----------------------------------------------------------------
?
IS2 ?
R ( +25 ° C ) R
V ICOMP ( max ) – V O = I OC ? DCR ( +25 ° C ) ? ----------------------------------------------- ? ? 1 + -------------- ?
S ?
IS1 ?
R ( +25 ° C ) + R R
R IS2
K ISENSE = 1 + -------------
V IMON = 31 ? I O ? DCR ( +25 ° C ) ? ----------------------------------------------- ? ? 1 + -------------- ?
V ICOMP = V O + V N ? K ISENSE
Sensing the time varying inductor current accurately
requires that the parallel R-C network time constant match
the inductor L/DCR time constant. Equation 10 shows this
relationship:
DCR
------------- = ? ------------------------------- ? ? C N
Solution of C N yields:
L
? DCR ?
C N = ------------------------------------- (EQ. 11)
? ------------------------------- ?
The first step is to adjust R N (T) and R S such that the correct
current information appears between the ISP and VO pins
even at light loads. Assume V N is the voltage drop across
R N (T). The V N to V DCR gain G 1 (T) provides a reasonable
amount of light load signal from which to derive the current
information. G 1 (T) is given by Equation 12:
R N ( T ) (EQ. 12)
R N ( T ) + R S
The gain of the current sense amplifier circuit is expressed in
Equation 13:
(EQ. 13)
R IS1
The current sense amplifier output voltage is given by
Equation 14:
(EQ. 14)
The inductor DCR is a function of temperature T and is
approximately given by Equation 15:
0.00393 is the temperature coefficient of the copper. To
make V ICOMP independent of the inductor temperature, the
NTC characteristic is desired to satisfy:
(EQ. 16)
where G 1target is the desired ratio of V N /V DCR . Therefore,
the temperature characteristics G 1 , which determines
parameters selection, is described by Equation 17:
G 1t arg et (EQ. 17)
1 + 0.00393 ? ( T – 25 ° C )
It is recommended to begin the DCR current sense design
using the R NTC , R NTCS , and R P component values of the
evaluation board available from Intersil.
Given the inductor DCR and the overcurrent set point I OC , the
maximum voltage of ICOMP pin is given by Equation 18:
N
N
(EQ. 18)
R N , R S , R IS1 , R IS2 should be adjusted to meet the
requirement (V ICOMP(max) - V O ) > 25mV and the time
constant matching according to Equation 10.
Given the output current I O , the current monitor IMON
voltage can be determined by Equation 19:
R N ( +25 ° C ) ? R IS2 ?
R N ( +25 ° C ) + R S ? R IS1 ?
(EQ. 19)
The effectiveness of the R N network is sensitive to the
coupling coefficient between the NTC thermistor and the
inductor. The NTC thermistor should be placed in the closet
proximity of the inductor.
DCR ( T ) = DCR 25 ° C ? ( 1 + 0.00393 ? ( T – 25 ° C ) )
(EQ. 15)
Resistor Current Sense
Figure 3 shows a detailed schematic using discrete resistor
sense of the inductor current. Figure 9 shows the equivalent
circuit. Since the current sense resistor voltage represents the
VDD
OCP
-
+
10μA
↓
+
OCSET
ISP
R OCSET
R S
+
Isense
?
ISN
ICOMP
-
VO
V DCR
FIGURE 8. EQUIVALENT MODEL OF CURRENT SENSE USING INDUCTOR DCR CURRENT SENSE
14
FN6753.1
July 8, 2010
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相关代理商/技术参数 |
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| ISL6263EVAL1 | 制造商:Intersil Corporation 功能描述:ISL6263 EVALUATION BOARD 1 - IMVP LICENSE REQUIRED - Bulk |
| ISL6264 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Two-Phase Core Controller for AMD Mobile Turion CPUs |
| ISL6264CRZ | 功能描述:IC CORE CTRLR TWO-PHASE 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 |
| ISL6264CRZ-T | 功能描述:IC CORE CTRLR TWO-PHASE 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 |
| ISL6265 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Multi-Output Controller with Integrated MOSFET Drivers for AMD SVI Capable |
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