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参数资料
| 型号： | ISL6327IRZ-T |
| 厂商： | Intersil |
| 文件页数： | 12/29页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 48-QFN |
| 标准包装： | 4,000 |
| PWM 型： | 控制器 |
| 输出数： | 6 |
| 频率 - 最大： | 1MHz |
| 占空比： | 25% |
| 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： | 48-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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ISL6327
I ( s )
V IN
L
The same capacitor C T is needed to match the time delay
between ISEN- and ISEN+ signals. Select the proper C T to
ISL6609
L
DCR
INDUCTOR
V L
V C (s)
V OUT
C OUT
keep the time constant of R ISEN and C T (R ISEN x C T ) close
to 27ns.
Equation 7 shows the ratio of the channel current to the
sensed current I SEN .
I SEN = I L ? -----------------------
R
L
PWM(n)
ISL6327 INTERNAL CIRCUIT
I n
R
C
R ISEN(n)
(PTC)
R SENSE
ISEN
L
I
R SENSE V OUT
C OUT
(EQ. 7)
ISL6327 INTERNAL CIRCUIT
CURRENT
SENSE
ISEN-(n)
I n
R ISEN(n)
+
-
CURRENT
I SEN = I ------------------
L R
DCR
ISEN
ISEN+(n)
C T
SENSE
+
-
ISEN-(n)
ISEN+(n)
C T
SENSE
I SEN = I --------------------------
L R
FIGURE 3. DCR SENSING CONFIGURATION
If the RC network components are selected such that the RC
time constant (= R*C) matches the inductor time constant
(= L/DCR), the voltage across the capacitor V C is equal to
the voltage drop across the DCR, i.e., proportional to the
channel current.
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.
Because of the internal filter at ISEN- pin, one capacitor C T
is needed to match the time delay between the ISEN- and
ISEN+ signals. Select the proper C T to keep the time
constant of R ISEN and C T (R ISEN x C T ) close to 27ns.
Equation 6 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.
R
ISEN
FIGURE 4. SENSE RESISTOR IN SERIES WITH INDUCTORS
The inductor DCR 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 the temperature effect on the sensed current
signal, a Positive Temperature Coefficient (PTC) resistor can
be selected for the sense resistor R ISEN , or the integrated
temperature compensation function of ISL6327 should be
utilized. The integrated temperature compensation function
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 sensed current of each channel to the
I SEN = I L ? ------------------
DCR
R ISEN
(EQ. 6)
average current to make an appropriate adjustment to the
PWM duty cycle of each channel with Intersil’s patented
current-balance method.
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 4). This
technique is more accurate, but reduces overall converter
efficiency due to the additional power loss on the current
sense element R SENSE .
12
Channel current balance is essential in achieving the
thermal advantage of multiphase operation. With good
current balance, the power loss is equally dissipated over
multiple devices and a greater area.
FN9276.4
May 5, 2008
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| ISL6328ACRZ-T | 功能描述:IC VOLTAGE REGULATOR 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 |
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| ISL6328AIRZ-T | 功能描述:IC VOLTAGE REGULATOR 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 |
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