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| 型号： | ISL6326BIRZ-T |
| 厂商： | Intersil |
| 文件页数： | 12/30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： | 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： | 40-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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ISL6326B
I ( s )
pages 4 and 5). Equation 3 is provided to assist in selecting
the correct resistor value.
V IN
L
R T = --------------------------
2.5X10
F SW
10
(EQ. 3)
ISL6605
L
DCR
INDUCTOR
V OUT
C OUT
where F SW is the switching frequency of each phase.
Current Sensing
V L
V C (s)
ISL6326B senses the current continuously for fast response.
PWM(n)
R
C
ISL6326B supports inductor DCR sensing, or resistive
sensing techniques. The associated channel current sense
ISL6326B INTERNAL CIRCUIT
amplifier uses the ISEN inputs to reproduce a signal
proportional to the inductor current, I L . The sense current,
I SEN , is proportional to the inductor current. The sensed
current is used for current balance, load-line regulation, and
overcurrent protection.
I n
CURRENT
R ISEN(n)
(PTC)
The internal circuitry, shown in Figures 3, and 4, represents
one channel of an N-channel converter. This circuitry is
SENSE
+
-
ISEN-(n)
I SEN = I ------------------
L R
repeated for each channel in the converter, but may not be
active depending on the status of the PWM3 and PWM4
pins, as described in the PWM Operation section.
INDUCTOR DCR SENSING
DCR
ISEN
ISEN+(n)
C T
An inductor ’s winding is characteristic of a distributed
resistance as measured by the DCR (Direct Current
Resistance) parameter. Consider the inductor DCR as a
separate lumped quantity, as shown in Figure 3. The
channel current I L , flowing through the inductor, will also
pass through the DCR. Equation 4 shows the s-domain
equivalent voltage across the inductor V L .
FIGURE 3. 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.
V L = I L ? ( s ? L + DCR )
(EQ. 4)
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
A simple R-C network across the inductor extracts the DCR
voltage, as shown in Figure 3.
The voltage on the capacitor V C , can be shown to be
proportional to the channel current I L , see Equation 5.
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.
? s ? ------------- + 1 ? ? ( DCR ? I )
V C = ---------------------------------------------------------------------
I SEN = I L ? ------------------
R
? DCR ? L
L
( s ? RC + 1 )
(EQ. 5)
DCR
ISEN
(EQ. 6)
If the R-C 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.
12
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 .
The same capacitor C T is needed to match the time delay
between 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.
FN9286.0
April 21, 2006
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6326CRZ | 功能描述:电流型 PWM 控制器 W/ANNEAL 4-PHS VR11 CNTRLR COM RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL6326CRZ-T | 功能描述:电流型 PWM 控制器 W/ANNEAL 4-PHS VR11 CNTRLR COM RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL6326CRZ-TR5453 | 制造商:Intersil Corporation 功能描述:STD. ISL6326CRZ-T W/GOLD BOND WIRE ONLY - Tape and Reel |
| ISL6326IRZ | 功能描述:电流型 PWM 控制器 W/ANNEAL 4-PHS VR11 CNTRLR IND RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL6326IRZ-T | 功能描述:电流型 PWM 控制器 W/ANNEAL 4-PHS VR11 CNTRLR IND RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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