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参数资料
| 型号： | ISL6306IRZ-T |
| 厂商： | Intersil |
| 文件页数： | 15/33页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 40-QFN |
| 标准包装： | 4,000 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 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： | -40°C ~ 85°C |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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ISL6306
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
R
R DS ( ON )
SEN = I L ----------------------------
ISEN
V IN
I SEN = I L ? ------------------
R
DCR
ISEN
RESISTIVE SENSING
(EQ. 5)
I n
SAMPLE
AND
HOLD
ISEN+(n)
I L
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
-
+
R ISEN
(PTC)
ISEN-(n)
-
I L x R λ DS ( ON )
+
N-CHANNEL
MOSFETs
sense element (R SENSE ).
Equation 6 shows the ratio of the channel current to the
ISL6306 INTERNAL CIRCUIT
EXTERNAL CIRCUIT
sensed current (I SEN ).
FIGURE 6. MOSFET r DS(ON) CURRENT-SENSING CIRCUIT
I SEN = I L ? -----------------------
R
R SENSE
ISEN
(EQ. 6)
Equation 7 shows the ratio of the channel current to the
sensed current I SEN .
I SEN = I L ------------------------- )
L
IL
R SENSE V OUT
R DS ( ON
R ISEN
(EQ. 7)
C OUT
Both inductor DCR and MOSFET r DS(ON) value will
ISL6306 INTERNAL CIRCUIT
increase as the temperature increases. Therefore the
I n
R ISEN(n)
sensed current will increase as the temperature of the
current sense element increases. In order to compensate
the temperature effect on the sensed current signal, a
SAMPLE
AND
HOLD
+
-
ISEN-(n)
ISEN+(n)
Positive Temperature Coefficient (PTC) resistor can be
selected for the sense resistor (R ISEN ), or the integrated
temperature compensation function of ISL6306 should be
utilized. The integrated temperature compensation function
SENSE
I SEN = I --------------------------
L R
R
ISEN
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
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 WPM duty cycle of each channel. Intersil’s patented
current-balance method is illustrated in Figure 7. In the
figure, 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.
FN9226.1
May 5, 2008
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| ISL6307ACRZ | 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) |
| ISL6307ACRZ-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) |
| 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 |
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