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参数资料
| 型号： | ISL6326CRZ |
| 厂商： | Intersil |
| 文件页数： | 25/30页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 40-QFN |
| 标准包装： | 50 |
| 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： | 0°C ~ 70°C |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 包装： | 管件 |
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ISL6326
conducted through the upper MOSFET across VIN. The
power dissipated as a result is P UP,3 and is approximately
Balance” on page 13). Choose R ISEN,2 in proportion to the
desired decrease in temperature rise in order to cause
P UP , 3 = V IN Q rr f S
(EQ. 28)
proportionally less current to flow in the hotter phase in
Equation 31:
R ISEN , 2 = R ISEN ---------- 2
Finally, the resistive part of the upper MOSFET’s is given in
Equation 29 as P UP,4 .
Δ T
Δ T 1
(EQ. 31)
The total power dissipated by the upper MOSFET at full load
can now be approximated as the summation of the results
from Equations 26, 27, and 28. Since the power equations
depend on MOSFET parameters, choosing the correct
MOSFETs can be an iterative process involving repetitive
solutions to the loss equations for different MOSFETs and
different switching frequencies.
Make sure that Δ T 2 is the desired temperature rise above the
ambient temperature, and Δ T 1 is the measured temperature
rise above the ambient temperature. While a single
adjustment according to Equation 31 is usually sufficient, it
may occasionally be necessary to adjust R ISEN two or more
times to achieve optimal thermal balance between all
channels.
I PP2
? I M ?
P UP , 4 ≈ r DS ( ON ) ? ------ ? d + ---------- d
? N ? 12
2
(EQ. 29)
Load-Line Regulation Resistor
The load-line regulation resistor is labelled R FB in Figure 5.
Its value depends on the desired loadline requirement of the
R ISEN = ----------------------- --------------
85 × 10
R LL = -------------------------
Current Sensing Resistor
The resistors connected to the ISEN+ pins determine the
gains in the load-line regulation loop and the channel-current
balance loop as well as setting the overcurrent trip point.
Select values for these resistors by using Equation 30:
R X I OCP (EQ. 30)
N
where R ISEN is the sense resistor connected to the
ISEN+ pin, N is the active channel number, R X is the
resistance of the current sense element, either the DCR of
the inductor or R SENSE depending on the sensing method,
application.
The desired loadline can be calculated by using
Equation 32:
V DROOP
(EQ. 32)
I FL
where I FL is the full load current of the specific application,
and VR DROOP is the desired voltage droop under the full
load condition.
Based on the desired loadline R LL , the loadline regulation
resistor can be calculated by using Equation 33:
NR R
R FB = ----------------------------------
and I OCP is the desired overcurrent trip point. Typically, I OCP
can be chosen to be 1.3x the maximum load current of the
specific application.
ISEN LL
R X
(EQ. 33)
∑ R ISEN ( n )
R X
With integrated temperature compensation, the sensed
current signal is independent on the operational temperature
of the power stage, i.e. the temperature effect on the current
sense element R X is cancelled by the integrated
temperature compensation function. R X in Equation 30
should be the resistance of the current sense element at the
room temperature.
When the integrated temperature compensation function is
disabled by pulling the TCOMP pin to GND, the sensed
current will be dependent on the operational temperature of
the power stage, since the DC resistance of the current
sense element may be changed according to the operational
temperature. R X in Equation 30 should be the maximum DC
resistance of the current sense element at the all-operational
temperature.
In certain circumstances, it may be necessary to adjust the
value of one or more ISEN resistors. When the components
of one or more channels are inhibited from effectively
dissipating their heat so that the affected channels run hotter
than desired, choose new, smaller values of RISEN for the
affected phases (see the section entitled “Channel-Current
25
where N is the active channel number, R ISEN is the sense
resistor connected to the ISEN+ pin, and R X is the
resistance of the current sense element, either the DCR of
the inductor or R SENSE depending on the sensing method.
If one or more of the current sense resistors are adjusted for
thermal balance, as in Equation 31, the load-line regulation
resistor should be selected based on the average value of
the current sensing resistors, as given in Equation 34:
R LL
R FB = ---------- (EQ. 34)
n
where R ISEN(n) is the current sensing resistor connected to
the n th ISEN+ pin.
Compensation
The two opposing goals of compensating the voltage
regulator are stability and speed. Depending on whether the
regulator employs the optional load-line regulation as
described in “Load-Line Regulation” on page 18, there are
two distinct methods for achieving these goals.
FN9262.1
May 5, 2008
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| ISL6327ACRZ | 功能描述:IC REG CTRLR BUCK PWM 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) |
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