参数资料
| 型号： | ISL6336AIRZ |
| 厂商： | Intersil |
| 文件页数： | 14/31页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM 6PHASE BUCK 48-QFN |
| 标准包装： | 43 |
| 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： | 48-VFQFN 裸露焊盘 |
| 供应商设备封装： | 48-QFN（7x7） |
| 包装： | 管件 |
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ISL6336, ISL6336A
Current Sensing
The ISL6336, ISL6336A senses current continuously for fast
The voltage on the capacitor V C , can be shown to be
proportional to the channel current I L ; see Equation 5.
? s ? ------------- + 1 ? ? ( DCR ? I )
V C = ---------------------------------------------------------------------
response. The ISL6336, ISL6336A supports inductor DCR
sensing, or resistor sensing techniques. The associated
channel current sense amplifier uses the ISEN inputs to
? DCR ? L
L
( s ? RC + 1 )
(EQ. 5)
I SEN = I L ? ------------------
R
reproduce a signal proportional to the inductor current, I L . The
sensed current, I SEN , is used for current balance, load-line
regulation, and the overcurrent protection.
The internal circuitry, shown in Figures 3 and 4, represents
one channel of an N-channel converter. This circuitry is
repeated for each channel in the converter, but may not be
active depending on the status of the PWM2, PWM3,
The input bias current of the current sensing amplifier is
typically 60nA; less than 5k Ω input impedance is preferred to
minimize the offset error.
INDUCTOR DCR SENSING
An inductor ’s winding is characteristic of a distributed
resistance as measured by the DCR (Direct Current
Resistance) parameter. Consider the inductor DCR as a
separate lumped quantity, as shown in Figure 4. The
channel current I L , flowing through the inductor, will also
pass through the DCR. Equation 4 shows the S-domain
equivalent voltage across the inductor V L .
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
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 the ISEN- pin, a 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.
DCR
(EQ. 6)
ISEN
RESISTIVE SENSING
V L = I L ? ( s ? L + DCR )
(EQ. 4)
For accurate current sense, a dedicated current-sense
resistor R SENSE in series with each output inductor can
V IN I ( s )
A simple R-C network across the inductor extracts the DCR
voltage, as shown in Figure 4.
L
serve as the current sense element (see Figure 5). This
technique is more accurate, but reduces overall converter
efficiency due to the additional power loss on the current
sense element R SENSE .
ISL6609
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.
I SEN = I L ? -----------------------
R
PWM(n)
ISL6336, ISL6336A
INTERNAL CIRCUIT
R
C
Equation 7 shows the ratio of the channel current to the
sensed current I SEN .
R SENSE
(EQ. 7)
ISEN
R ISEN(n)
I n
CURRENT
SENSE
+
-
ISEN-(n)
(PTC)
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
signal, a Positive Temperature Coefficient (PTC) resistor can
be selected for the sense resistor R ISEN , or the integrated
I SEN = I ------------------
L R
DCR
ISEN
ISEN+(n)
C T
temperature compensation function of ISL6336, ISL6336A
should be utilized instead. The integrated temperature
compensation function is described in “External Temperature
FIGURE 4. DCR SENSING CONFIGURATION
14
FN6504.1
May 28, 2009
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6336AIRZ-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 |
| ISL6336BCRZ | 功能描述:IC CTRLR PWM SYNC BUCK 48-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| ISL6336BCRZ-T | 功能描述:IC CTRLR PWM SYNC 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 |
| ISL6336BIRZ | 功能描述:IC CTRLR PWM SYNC BUCK 48-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| ISL6336BIRZ-T | 功能描述:IC CTRLR PWM SYNC 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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