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参数资料
| 型号： | ISL8103IRZ-T |
| 厂商： | Intersil |
| 文件页数： | 13/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 40-QFN |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.5MHz |
| 占空比： | 66.6% |
| 电源电压： | 4.75 V ~ 12.6 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： | -40°C ~ 85°C |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 包装： | 剪切带 (CT) |
| 产品目录页面： | 1244 (CN2011-ZH PDF) |
| 其它名称： | ISL8103IRZ-TCT |
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ISL8103
DCR
The droop voltage, V DROOP , is created by sensing the
current through the output inductors. This is accomplished
by using a continuous DCR current sensing method.
Inductor windings have a characteristic distributed
resistance or DCR (Direct Current Resistance). For
PHASE1
R S
I
V L (s)
L1
INDUCTOR
L 1
I OUT
V OUT
C OUT
simplicity, the inductor DCR is considered as a separate
lumped quantity, as shown in Figure 7. The channel current,
I L , flowing through the inductor, passes through the DCR.
Equation 6 shows the s-domain equivalent voltage, V L ,
across the inductor.
PHASE2
ISUM
R S
I
L2
DCR
INDUCTOR
L 2
V L ( s ) = I L ? ( s ? L + DCR )
(EQ. 6)
The inductor DCR is important because the voltage dropped
across it is proportional to the channel current. By using a
simple R-C network and a current sense amplifier, as shown
in Figure 7, the voltage drop across all of the inductors DCRs
-
ICOMP
DROOP
C COMP
R COMP
can be extracted. The output of the current sense amplifier,
V DROOP , can be shown to be proportional to the channel
currents I L1 , I L2 , and I L3 , shown in Equation 7.
V DROOP
+
IREF
C SUM
(Optional)
s ? L
? ------------- + 1 ?
(EQ. 7)
? DCR ? R COMP
( s ? R ? C + 1 ) R
VDROOP ( s ) = -------------------------------------------------------------------------- ? ----------------------- ? ( I L1 + I L2 + I L3 ) ? DCR
COMP COMP S
If the R-C network components are selected such that the
R-C time constant matches the inductor L/DCR time
constant, then V DROOP is equal to the sum of the voltage
drops across the individual DCRs, multiplied by a gain. As
Equation 8 shows, V DROOP is therefore proportional to the
total output current, I OUT .
ISL8103
FIGURE 7. DCR SENSING CONFIGURATION
By simply adjusting the value of R S , the load line can be set
to any level, giving the converter the right amount of droop at
all load currents. It may also be necessary to compensate for
any changes in DCR due to temperature. These changes
cause the load line to be skewed, and cause the R-C time
constant to not match the L/DCR time constant. If this
becomes a problem a simple negative temperature
V DROOP = --------------------- ? I OUT ? DCR
R COMP
R S
13
(EQ. 8)
coefficient resistor network can be used in the place of
R COMP to compensate for the rise in DCR due to
temperature.
Output Voltage Offset Programming
The ISL8103 allows the designer to accurately adjust the
offset voltage by connecting a resistor, R OFS , from the OFS
pin to VCC or GND. When R OFS is connected between OFS
and VCC, the voltage across it is regulated to 1.5V. This
causes a proportional current (I OFS ) to flow into the OFS pin
and out of the FB pin. If R OFS is connected to ground, the
voltage across it is regulated to 0.5V, and I OFS flows into the
FB pin and out of the OFS pin. The offset current flowing
through the resistor between VDIFF and FB will generate
the desired offset voltage which is equal to the product
(I OFS x R 1 ). These functions are shown in Figures 8 and 9.
FN9246.1
July 21, 2008
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL8104 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Synchronous Buck Pulse-Width Modulator (PWM) Controller |
| ISL8104CBZ | 功能描述:IC REG CTRLR BUCK PWM VM 14-SOIC 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) |
| ISL8104CBZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 14-SOIC 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) |
| ISL8104CRZ | 功能描述:IC REG CTRLR BUCK PWM VM 16-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) |
| ISL8104CRZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 16-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) |
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