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参数资料
| 型号： | ISL6329CRZ |
| 厂商： | Intersil |
| 文件页数： | 15/38页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM SYNC BUCK DL 60QFN |
| 标准包装： | 43 |
| 应用： | 控制器，AMD SVI |
| 输入电压： | 5 V ~ 12 V |
| 输出数： | 2 |
| 输出电压： | 0.0125 V ~ 1.55 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | * |
| 封装/外壳： | * |
| 供应商设备封装： | * |
| 包装： | * |
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ISL6329
Channel-Current Balance
One important benefit of multiphase operation is the thermal
advantage gained by distributing the dissipated heat over multiple
I AVG (T)
I AVG_TCOMP
devices and greater area. By doing this the designer avoids the
complexity of driving parallel MOSFETs and the 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
about the same amount of current at any load level. To achieve
this, the currents through each channel must be sampled every
R 1
R NTC
R 2
TCOMP1
R T (T)
TCOMP2
R TC = R T (25°C)
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
R T ( T ) = R 3 + -----------------------------------------------
-------------------------------- + -------
PWM1
V COMP
-
-
I 5
I AVG
I 4
R 3
1
1 1
R 1 + R NTC R2
FIGURE 5. AVERAGE CURRENT TEMPERATURE COMPENSATION
Temperature Compensated Current Sensing
As the load increases, the conduction losses in the output
inductors will cause the temperature of the inductors to rise. As
the inductor temperature rises, the DCR of the output inductors
will also rise. An increase in the DCR will result in an increase in
the sensed current even if the load current remains constant. To
counteract this error in the sensed current, the ISL6329 features
a temperature compensating circuit that utilizes an NTC resistor
to adjust the average current as inductor temperature increases.
Figure 5 shows the implementation of the ISL6329 average
current temperature compensation. The temperature dependent
resistor, R T (T), is a combination of resistors and an NTC which
create an approximate linearization of the NTC resistor (refer to
Equation 12). Resistors R 1 , R 2 and R 3 should be adjusted so that
Equation 13 is satisfied.
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 6, 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 .
+
+ TO GATE
MODULATOR CONTROL
RAMP LOGIC
WAVEFORM
FILTER f(s) I 6
I ER
÷ N Σ
-
+
I 3
I 2
I 1
NOTE: Channels 2, 3, 4, 5 and 6 are optional.
FIGURE 6. CHANNEL-1 PWM FUNCTION AND CURRENT-
BALANCE ADJUSTMENT
The filtered error signal modifies the pulse width commanded by
R T ( T ) = R 3 + --------------------------------------------
------------------------------ + -------
R T ( T ) = --------------------------------- ? R TC
1
R 1 + R NTC R 2
DCR ( 25 ° C )
DCR ( T )
1 1
(EQ. 12)
(EQ. 13)
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.
Serial VID Interface (SVI)
V TCOMP2 R ISEN
I LOAD = 8 ? ---------------------------- ? ------------------
R TC
Where R TC = R T (25°C)
LOAD MONITORING
The TCOMP2 pin can be utilized to monitor the load current. The
voltage across the R TC resistor is a temperature compensated
representation of the load current. The load current is given by
Equation 14.
(EQ. 14)
DCR
Where R ISEN is the current sense resistor value and DCR is the
DC resistance of the output inductors. It is recommended that a
high impedance buffer be used when monitoring the voltage on
the TCOMP2 pin.
15
The on-board Serial VID interface (SVI) circuitry allows the processor
to directly drive the core voltage and Northbridge voltage reference
level within the ISL6329. The SVC and SVD states are decoded with
direction from the PWROK input as described in the sections that
follow. The ISL6329 uses a digital to analog converter (DAC) to
generate a reference voltage based on the decoded SVI value. See
Figure 7 for a simple SVI interface timing diagram.
Pre-PWROK METAL VID
At start-up, the controller decodes the SVC and SVD inputs to
determine the Pre-PWROK metal VID setting. Once the POR circuitry
is satisfied, the ISL6329 begins decoding the inputs per Table 1.
Once the EN input exceeds the rising enable threshold, the ISL6329
saves the Pre-PWROK metal VID value in an on-board holding
register and passes this target to the internal DAC circuitry.
FN7800.0
April 19, 2011
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6329CRZ-T | 功能描述:电压模式 PWM 控制器 6+1 PHS DL PWM CONTRLR FOR CORE RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| ISL6329EVAL1Z | 制造商:Intersil Corporation 功能描述:ISL6329 EVALUATION BOARD - 60 LEAD - QFN - ROHS COMPLIANT - Bulk |
| ISL6329IRZ | 功能描述:电压模式 PWM 控制器 6+1 PHS DL PWM CONTRLR FOR CORE RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| ISL6329IRZ-T | 功能描述:电压模式 PWM 控制器 6+1 PHS DL PWM CONTRLR FOR CORE RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| ISL6333ACRZ | 功能描述:IC CTRLR PWM 3PHASE 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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