参数资料
| 型号： | ISL6322CRZ |
| 厂商： | Intersil |
| 文件页数： | 13/41页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM 4PHASE BUCK 48-QFN |
| 标准包装： | 43 |
| 应用： | 控制器，Intel VR10、VR11、AMD CPU |
| 输入电压： | 5 V ~ 12 V |
| 输出数： | 1 |
| 输出电压： | 0.38 V ~ 1.99 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 |
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ISL6322
expense of using expensive heat sinks and exotic magnetic
materials.
In order to realize the thermal advantage, it is important that
each channel in a multiphase converter be controlled to
carry equal amounts of current at any load level. To achieve
this, the currents through each channel must be sampled
every switching cycle. The sampled currents, I n , from each
active channel are summed together and divided by the
number of active channels. The resulting cycle average
current, I AVG , provides a measure of the total load-current
demand on the converter during each switching cycle.
Channel-current balance is achieved by comparing the
sampled current of each channel to the cycle average
current, and making the proper adjustment to each channel
pulse width based on the error. Intersil’s patented current-
balance method is illustrated in Figure 3, with error
correction for Channel 1 represented. In the figure, the cycle
average current, I AVG , is compared with the Channel 1
sample, I 1 , to create an error signal I ER .
The filtered error signal modifies the pulse width
commanded by V COMP to correct any unbalance and force
I ER toward zero. The same method for error signal
correction is applied to each active channel.
PWM
SWITCHING PERIOD
I L
I SEN
TIME
FIGURE 4. CONTINUOUS CURRENT SAMPLING
The ISL6322 supports inductor DCR current sensing to
continuously sense each channel’s current for
channel-current balance. The internal circuitry, shown in
Figure 5 represents Channel N of an N-Channel converter.
This circuitry is repeated for each channel in the converter,
but may not be active depending on how many channels are
V COMP
+
-
MODULATOR
RAMP
+
-
PWM1
TO GATE
CONTROL
LOGIC
operating.
Inductor windings have a characteristic distributed
WAVEFORM
resistance or DCR (Direct Current Resistance). For
FILTER
f(s)
simplicity, the inductor DCR is considered as a separate
I ER
+
-
I AVG
÷ N
Σ
I 4
I 3
I 2
lumped quantity, as shown in Figure 5. The channel current
I L , flowing through the inductor, passes through the DCR.
Equation 3 shows the s-domain equivalent voltage, V L ,
across the inductor.
I 1
Note: Channel 3 and 4 are optional
V L ( s ) = I L ? ( s ? L + DCR )
(EQ. 3)
FIGURE 3. CHANNEL-1 PWM FUNCTION AND
CURRENT-BALANCE ADJUSTMENT
Continuous Current Sampling
A simple R-C network across the inductor (R 1 and C)
extracts the DCR voltage, as shown in Figure 5. The voltage
across the sense capacitor, V C , can be shown to be
proportional to the channel current I L , shown in Equation 4.
? ------------- + 1 ?
( s ? R 1 ? C + 1 )
In order to realize proper current-balance, the currents in
each channel are sensed continuously every switching
cycle. During this time the current-sense amplifier uses the
s ? L
? DCR ?
V C ( s ) = -------------------------------------- ? DCR ? I L
(EQ. 4)
ISEN inputs to reproduce a signal proportional to the
inductor current, I L . This sensed current, I SEN , is simply a
scaled version of the inductor current.
13
In some cases it may be necessary to use a resistor divider
R-C network to sense the current through the inductor. This
can be accomplished by placing a second resistor, R 2 ,
across the sense capacitor. In these cases the voltage
across the sense capacitor, V C , becomes proportional to the
channel current I L , and the resistor divider ratio, K.
FN6328.2
August 2, 2007
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6322CRZ-T | 功能描述:IC CTRLR PWM 4PHASE 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) |
| ISL6322GCRZ | 功能描述:IC CTRLR PWM 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:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
| ISL6322GCRZ-T | 功能描述:IC CTRLR PWM 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 |
| ISL6322GIRZ | 功能描述:IC CTRLR PWM 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:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
| ISL6322GIRZ-T | 功能描述:IC CTRLR PWM 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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