参数资料
| 型号： | ISL6334ACRZ-TR5368 |
| 厂商： | Intersil |
| 文件页数： | 15/31页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM 4PHASE BUCK 40QFN |
| 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： | 0°C ~ 70°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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ISL6334AR5368
I SEN = I L ? ------------------
pass through the DCR. Equation 4 shows the S-domain
equivalent voltage across the inductor V L .
DCR
R ISEN
(EQ. 6)
V L ( s ) = I L ? ( s ? L + DCR )
(EQ. 4)
RESISTIVE SENSING
For accurate current sense, a dedicated current-sense resistor
A simple R-C network across the inductor extracts the DCR
voltage, as shown in Figure 4.
R SENSE in series with each output inductor can serve as the
current sense element (see Figure 5). This technique is more
I ( s )
V IN
L
accurate, but reduces overall converter efficiency due to the
additional power loss on the current sense element R SENSE .
L
DCR
V OUT
The same capacitor C T is needed to match the time delay
ISL6596
INDUCTOR
V L
C OUT
between ISEN- and ISEN+ signals. Select the proper C T to
keep the time constant of R ISEN and C T (R ISEN x C T ) close to
27ns.
V C (s)
Equation 7 shows the ratio of the channel current to the
I SEN = I L ? -----------------------
R
PWM(n)
ISL6334AR5368 INTERNAL CIRCUIT
R
C
sensed current I SEN .
R SENSE
ISEN
(EQ. 7)
I n
CURRENT
R ISEN(n)
The inductor DCR value will increase as the temperature
increases. Therefore, the sensed current will increase as the
temperature of the current sense element increases. In order
to compensate the temperature effect on the sensed current
SENSE
+
-
ISEN-(n)
signal, a Positive Temperature Coefficient (PTC) resistor can
be selected for the sense resistor R ISEN , or the integrated
temperature compensation function of ISL6334AR5368
ISEN+(n)
C T
should be utilized. The integrated temperature compensation
I SEN = I ------------------
L R
DCR
ISEN
FIGURE 4. DCR SENSING CONFIGURATION
The voltage on the capacitor V C , can be shown to be
proportional to the channel current I L . See Equation 5.
IL
L
R SENSE V OUT
C OUT
ISL6334AR5368 INTERNAL CIRCUIT
? s ? ------------- + 1 ? ? ( DCR ? I )
V C ( s ) = ---------------------------------------------------------------------
? DCR ? L
L
( s ? RC + 1 )
(EQ. 5)
I n
CURRENT
R ISEN(n)
If the R-C network components are selected such that the
RC time constant (= R*C) matches the inductor time
constant (= L/DCR), the voltage across the capacitor V C is
equal to the voltage drop across the DCR, i.e., proportional
SENSE
+
-
ISEN-(n)
ISEN+(n)
C T
I SEN = I --------------------------
L R
to the channel current.
With the internal low-offset current amplifier, the capacitor
voltage V C is replicated across the sense resistor R ISEN .
Therefore, the current out of ISEN+ pin, I SEN , is proportional
to the inductor current.
Because of the internal filter at ISEN- pin, one capacitor, C T ,
is needed to match the time delay between the ISEN- and
ISEN+ signals. Select the proper C T to keep the time
constant of R ISEN and C T (R ISEN x C T ) close to 27ns.
Equation 6 shows that the ratio of the channel current to the
sensed current, I SEN , is driven by the value of the sense
resistor and the DCR of the inductor.
15
R SENSE
ISEN
FIGURE 5. SENSE RESISTOR IN SERIES WITH INDUCTORS
Channel-Current Balance
The sensed current I n from each active channel is summed
together and divided by the number of active channels. The
resulting average current I AVG provides a measure of the
total load current. Channel current balance is achieved by
comparing the sensed current of each channel to the
average current to make an appropriate adjustment to the
PWM duty cycle of each channel with Intersil’s patented
current-balance method.
FN6839.2
September 7, 2010
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| ISL6334ACRZ-TR5453 | 制造商:Intersil Corporation 功能描述:STD. ISL6334ACRZ-T W/GOLD BOND WIRE ONLY T&R - Tape and Reel |
| ISL6334AIRZ | 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 |
| ISL6334AIRZR5368 | 功能描述:IC CTRLR PWM 4PHASE BUCK 40QFN 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 |
| ISL6334AIRZ-T | 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 |
| ISL6334AIRZ-TR5368 | 功能描述:IC CTRLR PWM 4PHASE BUCK 40QFN 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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