参数资料
| 型号： | ISL6334DIRZ |
| 厂商： | Intersil |
| 文件页数： | 13/28页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM 4PHASE VR11.1 40QFN |
| 标准包装： | 50 |
| 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： | 管件 |
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ISL6334D
A simple R-C network across the inductor extracts the DCR
voltage, as shown in Figure 4.
current sense element (see Figure 5). This technique is more
accurate, but reduces overall converter efficiency due to the
I ( s )
V IN
L
additional power loss on the current sense element R SENSE .
ISL6596
L
DCR
INDUCTOR
V L
V C (s)
V OUT
C OUT
The same capacitor C T is needed to match the time delay
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.
Equation 7 shows the ratio of the channel current to the
I SEN = I L ? -----------------------
PWM(n)
R
C
sensed current I SEN .
R SENSE
R ISEN
(EQ. 7)
ISL6334D INTERNAL CIRCUIT
The inductor DCR value will increase as the temperature
I n
CURRENT
R ISEN(n)
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
signal, a Positive Temperature Coefficient (PTC) resistor can
SENSE
+
-
ISEN-(n)
ISEN+(n)
C T
be selected for the sense resistor R ISEN , or the integrated
temperature compensation function of ISL6334D should be
utilized. The integrated temperature compensation function is
I SEN = I -------------------
L R
DCR
ISEN
L
IL
R SENSE V OUT
FIGURE 4. DCR SENSING CONFIGURATION
The voltage on the capacitor V C , can be shown to be
ISL6334D INTERNAL CIRCUIT
C OUT
? s ? ------------- + 1 ? ? ( DCR ? I )
V C ( s ) = ---------------------------------------------------------------------
proportional to the channel current I L (see Equation 5).
L
? DCR ? L (EQ. 5)
( s ? RC + 1 )
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
SENSE
+
-
ISEN-(n)
constant (= L/DCR), the voltage across the capacitor V C is
ISEN+(n)
C T
SENSE
I SEN = I --------------------------
L R
equal to the voltage drop across the DCR, i.e., proportional
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.
R
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.
Channel current balance is essential in achieving the
I SEN = I L ? ------------------
DCR
R ISEN
(EQ. 6)
thermal advantage of multiphase operation. With good
current balance, the power loss is equally dissipated over
multiple devices and a greater area.
RESISTIVE SENSING
For accurate current sense, a dedicated current-sense resistor
R SENSE in series with each output inductor can serve as the
13
Voltage Regulation
The compensation network shown in Figure 6 assures that
the steady-state error in the output voltage is limited only to
FN6802.3
November 22, 2013
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相关代理商/技术参数 |
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| ISL6334DIRZ-T | 功能描述:IC CTRLR PWM 4PHASE VR11.1 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 |
| ISL6334IRZ | 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 |
| ISL6334IRZ-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 |
| ISL6336ACRZ | 功能描述:IC CTRLR PWM 6PHASE BUCK 48-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 |
| ISL6336ACRZ-T | 功能描述:IC CTRLR PWM 6PHASE BUCK 48-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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