参数资料
| 型号： | ISL6336BCRZ |
| 厂商： | Intersil |
| 文件页数： | 14/31页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM SYNC 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： | 0°C ~ 70°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 |
| 产品目录页面： | 1248 (CN2011-ZH PDF) |
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ISL6336B
selecting the correct resistor value.
The voltage on the capacitor V C , can be shown to be
proportional to the channel current I L ; see Equation 5.
2.5X10
R T = --------------------------
? s ? ------------- + 1 ? ? ( DCR ? I )
V C = ---------------------------------------------------------------------
F SW
10
(EQ. 3)
? DCR ? L
L
( s ? RC + 1 )
(EQ. 5)
I SEN = I L ? ------------------
R
where F SW is the switching frequency of each phase.
Equation 3 also applies for connecting FS to VCC or GND.
Figure 3 shows the relationship between R T and F SW ,
according to Equation 3.
1000
900
800
700
600
500
400
300
200
100
20 30 40 50 60 70 80 90 100
R T (k Ω )
FIGURE 3. SWITCHING FREQUENCY vs R T
Current Sensing
The ISL6336B senses current continuously for fast response.
The ISL6336B supports inductor DCR sensing, or resistor
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
sensing techniques. The associated channel current sense
amplifier uses the ISEN inputs to reproduce a signal
V IN
IL ( s )
DCR
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
ISL6609
L
INDUCTOR
V L
V C (s)
V OUT
C OUT
repeated for each channel in the converter, but may not be
active depending on the status of the PWM2, PWM3,
PWM(n)
R
C
ISL6336B
INTERNAL CIRCUIT
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.
I n
R ISEN(n)
(PTC)
INDUCTOR DCR SENSING
An inductor ’s winding is characteristic of a distributed
CURRENT
SENSE
+
ISEN-(n)
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
-
ISEN+(n)
C T
I SEN = I -------------------
L R
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 .
DCR
ISEN
FIGURE 4. DCR SENSING CONFIGURATION
V L = I L ? ( s ? L + DCR )
(EQ. 4)
RESISTIVE SENSING
A simple R-C network across the inductor extracts the DCR
voltage, as shown in Figure 4.
14
For accurate current sense, a dedicated current-sense
resistor R SENSE in series with each output inductor can
serve as the current sense element (see Figure 5). This
technique is more accurate, but reduces overall converter
FN6696.2
August 31, 2010
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相关代理商/技术参数 |
参数描述 |
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| 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 |
| ISL6336CRZ | 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 |
| ISL6336CRZ-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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