参数资料
型号: ISL6307BIRZ-T
厂商: Intersil
文件页数: 14/33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:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 48-VFQFN 裸露焊盘
包装: 带卷 (TR)
ISL6307B
I ( s )
L
ISL6612
V IN
L
L
DCR
INDUCTOR
V L
V OUT
C OUT
ISL6307B INTERNAL CIRCUIT
L
I
R SENSE V OUT
C OUT
V C (s)
I n
R ISEN(n)
PWM(n)
R
C
SAMPLE
&
HOLD
ISEN-(n)
ISL6307B INTERNAL CIRCUIT
+
SENSE
SEN = I L --------------------------
ISEN
I n
SAMPLE
&
HOLD
ISEN-(n)
R ISEN(n)
(PTC)
-
ISEN+(n)
R
I
R
FIGURE 5. SENSE RESISTOR IN SERIES WITH INDUCTORS
+
I SEN = I -------------------
L R
-
ISEN+(n)
DCR
ISEN
FIGURE 4. DCR SENSING CONFIGURATION
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.
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 .
I SEN = I --------------------------- ) -
R ISEN
Equation 5 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.
I n
L
R DS ( ON
V IN
I SEN = I L ? ------------------
DCR
R ISEN
(EQ. 5)
SAMPLE
&
HOLD
ISEN+(n)
I L
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
-
+
R ISEN
(PTC)
ISEN-(n)
-
I L xR DS ( ON )
+
N-CHANNEL
MOSFETs
efficiency due to the additional power loss on the current
sense element R SENSE .
ISL6307B INTERNAL CIRCUIT
EXTERNAL CIRCUIT
Equation 6 shows the ratio of the channel current to the
sensed current I SEN .
FIGURE 6. MOSFET R DS(ON) CURRENT-SENSING CIRCUIT
I SEN = I L ? -----------------------
R
I SEN = I L ------------------------- )
R SENSE
ISEN
14
(EQ. 6)
Equation 7 shows the ratio of the channel current to the
sensed current I SEN .
R DS ( ON
(EQ. 7)
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
current sense element increases. In order to compensate
FN9225.0
March 9, 2006
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ISL6307BCRZ-T IC REG CTRLR BUCK PWM VM 48-QFN
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ISL6307CRZ 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)
ISL6307CRZ-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)
ISL6307IRZ 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)
ISL6307IRZ-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)
ISL6308ACRZ 功能描述:IC CTRLR PWM BUCK 3PHASE 40-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