参数资料
| 型号： | ISL6308AIRZ |
| 厂商： | Intersil |
| 文件页数： | 13/28页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM BUCK 3PHASE 40-QFN |
| 标准包装： | 500 |
| 应用： | 控制器，DDR |
| 输入电压： | 5 V ~ 12 V |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 2.3 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： | 管件 |
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ISL6308A
EXTERNAL CIRCUIT
ISL6308A INTERNAL CIRCUIT
I L , flowing through the inductor, passes through the DCR.
R 2
C 1
COMP
Equation 6 shows the S-domain equivalent voltage, V L ,
across the inductor.
DAC
VID DAC
V L ( s ) = I L ? ( s ? L + DCR )
(EQ. 6)
REF
The inductor DCR is important because the voltage dropped
R 1
+
V OFS
-
C REF
FB
VDIFF
I OFS
+
-
V COMP
ERROR AMPLIFIER
across it is proportional to the channel current. By using a
simple R-C network and a current sense amplifier, as shown
in Figure 7, the voltage drop across all of the inductors DCRs
can be extracted. The output of the current sense amplifier,
V DROOP , can be shown to be proportional to the channel
currents I L1 , I L2 , and I L3 , shown in Equation 7.
DROOP
? ------------- + 1 ?
? DCR ?
COMP
( s ) = -------------------------------------------------------------------------- ? ----------------------- ? ( I
( s ? R ? C + 1 ) R
+ I ) ? DCR
+
V OUT
R S1
VSEN
R P1
+
+
V
s ? L
COMP COMP S
R
L1
+ I
L2
(EQ. 7)
L3
-
If the R-C network components are selected such that the
RGND
-
R-C time constant matches the inductor L/DCR time
-
V DROOP
+
DROOP
IREF
-
DIFFERENTIAL
REMOTE-SENSE
AMPLIFIER
constant, then V DROOP is equal to the sum of the voltage
drops across the individual DCRs, multiplied by a gain. As
Equation 8 shows, V DROOP is therefore proportional to the
total output current, I OUT .
V DROOP = --------------------- ? I OUT ? DCR
C SUM
ICOMP
+
ISENSE
AMP
-
R COMP
R S
(EQ. 8)
ISUM
DCR
FIGURE 6. OUTPUT VOLTAGE AND LOAD-LINE
REGULATION WITH OFFSET ADJUSTMENT
Load-Line (Droop) Regulation
In some high current applications, a requirement on a
precisely controlled output impedance is imposed. This
dependence of output voltage on load current is often
PHASE1
PHASE2
R S
V L (s)
L1
INDUCTOR
IL 1
L2
DCR
INDUCTOR
I
L 2
I OUT
V OUT
C OUT
termed “droop” or “load line” regulation.
The Droop is an optional feature in the ISL6308A. It can be
enabled by connecting ICOMP pin to DROOP pin, as shown
ISUM
R S
in Figure 6. To disable it, connect the DROOP pin to IREF pin.
As shown in Figure 6, a voltage, V DROOP , proportional to the
total current in all active channels, I OUT , feeds into the
-
ICOMP
C COMP
R COMP
differential remote-sense amplifier. The resulting voltage at
DROOP
the output of the remote-sense amplifier is the sum of the
output voltage and the droop voltage. As Equation 4 shows,
feeding this voltage into the compensation network causes
V DROOP
+
IREF
C SUM
(OPTIONAL)
the regulator to adjust the output voltage so that it’s equal to
the reference voltage minus the droop voltage.
The droop voltage, V DROOP , is created by sensing the
current through the output inductors. This is accomplished
by using a continuous DCR current sensing method.
Inductor windings have a characteristic distributed
resistance or DCR (Direct Current Resistance). For
simplicity, the inductor DCR is considered as a separate
lumped quantity, as shown in Figure 7. The channel current,
13
ISL6308A
FIGURE 7. DCR SENSING CONFIGURATION
FN6669.0
September 9, 2008
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相关代理商/技术参数 |
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| ISL6308AIRZ-T | 功能描述:IC CTRLR PWM BUCK 3PHASE 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 |
| ISL6308CRZ | 功能描述:电压模式 PWM 控制器 DAC-LESS MULTI-PHS PWM CNTRLR W/3-DRVRS RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| ISL6308CRZR5374 | 制造商:Intersil Corporation 功能描述:ISL6308CRZ W/ 24HR BURN-IN - Rail/Tube 制造商:Intersil Corporation 功能描述:IC CTRLR PWM 3PHASE BUCK 40-QFN 制造商:Intersil 功能描述:ISL6308CRZ W/24HRU RN-IN |
| ISL6308CRZ-T | 功能描述:电压模式 PWM 控制器 DAC-LESS MULTI-PHS PWM CNTRLR W/3-DRVRS RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| ISL6308CRZ-TR5374 | 制造商:Intersil Corporation 功能描述:ISL6308CRZ W/ 24HR BURN-IN - Tape and Reel 制造商:Intersil Corporation 功能描述:IC CTRLR PWM 3PHASE BUCK 40-QFN 制造商:Intersil 功能描述:ISL6308CRZ W/24HRU RN-IN |
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