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| 型号： | ISL6117CBZA-T |
| 厂商： | Intersil |
| 文件页数： | 6/13页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR POWER DISTRIB 8-SOIC |
| 标准包装： | 2,500 |
| 类型： | 热交换控制器 |
| 应用： | 通用 |
| 内部开关： | 无 |
| 电源电压： | 9 V ~ 15 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 带卷 (TR) |
ISL6115, ISL6116, ISL6117, ISL6120
TABLE 1. R ISET PROGRAMMING RESISTOR VALUE
R ISET RESISTOR NOMINAL CR VTH
10k Ω 200mV
4.99k Ω 100mV
2.5k Ω 50mV
external N-Channel MOSFET is reduced driving the
MOSFET switch into a (linear region) high r DS(ON)
state. Strike a balance between the CR limit and the
timing requirements to avoid periods when the
external N-Channel MOSFETs may be damaged or
destroyed due to excessive internal power dissipation.
750 Ω
15mV
Refer to the MOSFET SOA information in the
NOTE: Nominal Vth = R ISET x 20μA.
TABLE 2. C TIM CAPACITOR VALUE
manufacturer’s data sheet.
When driving particularly large capacitive loads a
C TIM CAPACITOR
0.022μF
0.047μF
0.1μF
NOMINAL CURRENT LIMITED
PERIOD
2ms
4.4ms
9.3ms
longer soft-start time to prevent current regulation
upon charging and a short CR time may offer the best
application solution relative to reliability and FET MTF.
Physical layout of R SENSE resistor is critical to
avoid the possibility of false overcurrent occurrences.
NOTE: Nominal time-out period = C TIM x 93k Ω .
This IC responds to a severe overcurrent load (defined
as a voltage across the sense resistor >150mV over
Ideally, trace routing between the R SENSE resistors
and the IC is as direct and as short as possible with
zero current in the sense lines (see Figure 1)..
the OC Vth set point) by immediately driving the
N-Channel MOSFET gate to 0V in about 10μs. The gate
voltage is then slowly ramped up turning on the
N-Channel MOSFET to the programmed current
regulation level; this is the start of the time-out period.
Upon a UV condition, the PGOOD signal will pull low
when tied high through a resistor to the logic or VDD
supply. This pin is a UV fault indicator. For an OC
latch-off indication, monitor CTIM, pin 6. This pin will
rise rapidly from 1.9V to VDD once the time-out period
expires.
See Figures 12 through 16 for waveforms relevant to
text.
CORRECT
TO ISEN AND
R ISET
INCORRECT
CURRENT
SENSE RESISTOR
The IC is reset after an OC latch-off condition by a low
level on the PWRON pin and is turned on by the
PWRON pin being driven high.
Application Considerations
Design applications where the CR Vth is set extremely
low (25mV or less), there is a two-fold risk to
consider.
? There is the susceptibility to noise influencing the
absolute CR Vth value. This can be addressed with a
100pF capacitor across the R SENSE resistor.
? Due to common mode limitations of the
overcurrent comparator, the voltage on the ISET
pin must be 20mV above the IC ground either
initially (from I SET *R SET ) or before C TIM reaches
time-out (from gate charge-up). If this does not
happen, the IC may incorrectly report overcurrent
fault at start-up when there is no fault. Circuits
with high load capacitance and initially low load
current are susceptible to this type of unexpected
behavior.
Do not signal nor pull-up the PWRON input to > 5V.
Exceeding 6V on this pin will cause the internal charge
pump to malfunction.
During the soft-start and the time-out delay duration
with the IC in its current limit mode, the V GS of the
6
FIGURE 1. SENSE RESISTOR PCB LAYOUT
Using the ISL6116 as a -48V
Low Side Hot Swap Power
Controller
To supply the required V DD , it is necessary to maintain
the chip supply 10V to 16V above the -48V bus. This
may be accomplished with a suitable regulator
between the voltage rail and pin 5 (VDD). By using a
regulator, the designer may ignore the bus voltage
variations. However, a low-cost alternative is to use a
Zener diode (see Figure 2 for typical 5A load control);
this option is detailed in the following.
Note that in this configuration the PGOOD feature
(pin 7) is not operational as the I SEN pin voltage is
always < UV threshold.
See Figures 17 through 20 for waveforms relevant to
-48V and other high voltage applications.
FN9100.7
April 29, 2010
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6117CBZA-TS2490 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| ISL6118 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Dual Power Supply Controller |
| ISL6118EVAL1 | 功能描述:EVALUATION PLATFORM FOR ISL6118 RoHS:否 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:PCI Express® (PCIe) 主要目的:接口，收发器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要属性:- 次要属性:- 已供物品:板 |
| ISL6118EVAL1-T | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Dual Power Supply Controller |
| ISL6118HIB | 功能描述:IC CTRLR DUAL PWR SUPPLY 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR) |
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