参数资料
型号: ISL6307BCRZ
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: 43
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: 0°C ~ 70°C
封装/外壳: 48-VFQFN 裸露焊盘
包装: 管件
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
相关PDF资料
PDF描述
VE-J5T-EY-F3 CONVERTER MOD DC/DC 6.5V 50W
ISL6327CRZ-T IC REG CTRLR BUCK PWM 48-QFN
ISL6552CBZ IC REG CTRLR BUCK PWM 20-SOIC
B41042A5158M 1500UF 25V 12.5X31.5 SINGLE END
VE-2T0-EW-F1 CONVERTER MOD DC/DC 5V 100W
相关代理商/技术参数
参数描述
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
ISL6307BIRZ-T 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
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)