参数资料
| 型号： | ISL6312AIRZ |
| 厂商： | Intersil |
| 文件页数： | 12/35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 ~ 1.6 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 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页当前第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页
ISL6312A
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
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
PWM1
V COMP
-
-
L
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)
operating.
MOSFET
DRIVER
UGATE(n)
LGATE(n)
V IN
I
L
DCR
INDUCTOR
V L (s)
V OUT
C OUT
I ER
+
-
I AVG
÷ N
Σ
I 4
I 3
I 2
ISL6312A INTERNAL CIRCUIT
R 1
V C (s)
C 1
R 2*
I 1
NOTE: Channel 3 and 4 are optional.
FIGURE 3. CHANNEL-1 PWM FUNCTION AND CURRENT-
BALANCE ADJUSTMENT
I n
SAMPLE
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.
I SEN
+
-
V C (s)
R ISEN
ISEN-(n)
ISEN+(n)
*R 2 is OPTIONAL
FIGURE 5. INDUCTOR DCR CURRENT SENSING
CONFIGURATION
PWM
SWITCHING PERIOD
I L
Inductor windings have a characteristic distributed
resistance or DCR (Direct Current Resistance). For
simplicity, the inductor DCR is considered as a separate
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 SEN
V L ( s ) = I L ? ( s ? L + DCR )
(EQ. 3)
A simple R-C network across the inductor (R 1 and C)
extracts the DCR voltage, as shown in Figure 5. The voltage
? ------------- + 1 ?
? DCR ?
V C ( s ) = -------------------------------------- ? DCR ? I L
TIME
FIGURE 4. CONTINUOUS CURRENT SAMPLING
Continuous Current Sampling
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
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.
The ISL6312A supports inductor DCR current sensing to
continuously sense each channel’s current for
12
across the sense capacitor, V C , can be shown to be
proportional to the channel current I L , shown in Equation 4.
s ? L
(EQ. 4)
( s ? R 1 ? C + 1 )
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.
FN9290.5
February 1, 2011
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6312AIRZ-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) |
| ISL6312CRZ | 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:- 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) |
| ISL6312CRZ-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:- 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 |
| ISL6312CRZ-TK | 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:- 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 |
| ISL6312CRZ-TR5312 | 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) |
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