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参数资料
| 型号： | ISL6307ACRZ-T |
| 厂商： | Intersil |
| 文件页数： | 15/33页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 48-QFN |
| 标准包装： | 4,000 |
| PWM 型： | 电压模式 |
| 输出数： | 6 |
| 频率 - 最大： | 275kHz |
| 占空比： | 66.7% |
| 电源电压： | 4.75 V ~ 5.25 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 48-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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ISL6307A
I x R
Resistive Sensing
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
efficiency due to the additional power loss on the current
sense element R SENSE .
Equation 6 shows the ratio of the channel current to the
sensed current I SEN .
I R DS ( ON )
R
SEN = I L ----------------------------
ISEN
I n
SAMPLE
&
HOLD
-
ISEN+(n)
R ISEN
(PTC)
ISEN-(n)
V IN
-
L
+
I L
DS ( ON )
I SEN = I L ? -----------------------
R SENSE
R ISEN
(EQ. 6)
+
N-CHANNEL
MOSFETs
L
L
I
R SENSE V OUT
ISL6307A INTERNAL CIRCUIT EXTERNAL CIRCUIT
FIGURE 6. MOSFET R DS(ON) CURRENT-SENSING CIRCUIT
ISL6307A INTERNAL CIRCUIT
C OUT
Equation 7 shows the ratio of the channel current to the
sensed current I SEN .
I SEN = I L ------------------------- )
I n
SAMPLE
&
HOLD
+
ISEN-(n)
R ISEN(n)
R DS ( ON
R ISEN
Both inductor DCR and MOSFET R DS(ON) value will
increase as the temperature increases. Therefore the
sensed current will increase as the temperature of the
(EQ. 7)
-
ISEN+(n)
current sense element increases. In order to compensate
the temperature effect on the sensed current signal, a
R ISEN
I R SENSE
SEN = I L --------------------------
FIGURE 5. SENSE RESISTOR IN SERIES WITH INDUCTORS
MOSFET R DS(ON) Sensing
The controller can also sense the channel load current by
sampling the voltage across the lower MOSFET R DS(ON)
(see Figure 6). The amplifier is ground-reference by
connecting the ISEN- pin to the source of the lower
MOSFET. ISEN+ pin is connected to the PHASE node
through the current sense resistor R ISEN . The voltage
across R ISEN is equivalent to the voltage drop across the
R DS(ON) of the lower MOSFET while it is conducting. The
resulting current out of the ISEN+ pin is proportional to the
channel current I L .
15
Positive Temperature Coefficient (PTC) resistor can be
selected for the sense resistor R ISEN , or the integrated
temperature compensation function of ISL6307A should be
utilized. The integrated temperature compensation function
is described in the Temperature Compensation section.
Channel-Current Balance
The sensed current I n from each active channel are summed
together and divided by the number of active channels. The
resulting average current I AVG provides a measure of the
total load current. Channel current balance is achieved by
comparing the sampled current of each channel to the
average current to make an appropriate adjustment to the
PWM duty cycle of each channel. Intersil’s patented current-
balance method is illustrated in Figure 7. The average
current combines with the channel 1 current 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.
FN9236.0
February 6, 2006
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6307AIRZ | 功能描述:IC REG CTRLR BUCK PWM VM 48-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL6307AIRZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 48-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL6307BCRZ | 功能描述:软开关 PWM 控制器 W/ANNEAL 6-PHS VR11 CNTRLR COM RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| ISL6307BCRZ-T | 功能描述:软开关 PWM 控制器 W/ANNEAL 6-PHS VR11 CNTRLR COM TAPE AND RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| ISL6307BIRZ | 功能描述:软开关 PWM 控制器 W/ANNEAL 6-PHS VR11 CNTRLR INDUSTRIAL RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
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