参数资料
| 型号： | ISL6405ERZ |
| 厂商： | Intersil |
| 文件页数： | 8/13页 |
| 文件大小： | 0K |
| 描述： | IC VOLT REG DUAL LNB 32-QFN |
| 标准包装： | 60 |
| 应用： | 转换器，卫星信号接收机顶盒设计 |
| 输入电压： | 8 V ~ 14 V |
| 输出数： | 2 |
| 输出电压： | 13 V ~ 18 V |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN（5x5） |
| 包装： | 管件 |
ISL6405
This feature only affects the turn-on and programmed
TABLE 1.
voltage rise and fall times.
Current Limiting
The current limiting block has two thresholds that can be
selected by the ISEL bit of the SR and can work either
statically (simple current clamp) or dynamically. The lower
threshold is between 425mA and 530mA (ISEL = L), while
I 2 C BITS
13V
14V
13V
14V
SEL18V (1, 2)
Low
Low
High
High
O/P VOLTAGE
13V
14V
18V
19V
the higher threshold is between 775mA and 925mA
(ISEL = H). When the DCL (Dynamic Current Limiting) bit is
set to LOW, the over current protection circuit works
dynamically: as soon as an overload is detected, the output
is shutdown for a time t OFF , typically 900ms. Simultaneously
the OLF bit of the System Register is set to HIGH. After this
time has elapsed, the output is resumed for a time t ON =
20ms. During t ON , the device output will be current limited to
425mA or 775mA, depending on the ISEL bits. At the end of
t ON , if the overload is still detected, the protection circuit will
cycle again through t OFF and t ON . At the end of a full t ON in
which no overload is detected, normal operation is resumed
and the OLF bit is reset to LOW. Typical t ON + t OFF time is
920ms as determined by an internal timer. This dynamic
operation can greatly reduce the power dissipation in a short
circuit condition, still ensuring excellent power-on start-up in
most conditions.
However, there could be some cases in which a highly
capacitive load on the output may cause a difficult start-up
when the dynamic protection is chosen. This can be solved
by initiating any power start-up in static mode (DCL = HIGH)
and then switching to the dynamic mode (DCL = LOW) after
a chosen amount of time. When in static mode, the OLF1/2
bit goes HIGH when the current clamp limit is reached and
returns LOW when the overload condition is cleared. The
OLF1/2 bit will be LOW at the end of initial power-on soft-start.
Thermal Protection
I 2 C Bus Interface for ISL6405
(Refer to Philips I 2 C Specification, Rev. 2.1)
Data transmission from main microprocessor to the ISL6405
and vice versa takes place through the two wire I 2 C bus
interface, consisting of the two lines SDA and SCL. Both SDA
and SCL are bidirectional lines, connected to a positive supply
voltage via a pull up resistor. (Pull up resistors to positive supply
voltage must be externally connected). When the bus is free,
both lines are HIGH. The output stages of ISL6405 will have an
open drain/open collector in order to perform the wired-AND
function. Data on the I 2 C bus can be transferred up to 100Kbps
in the standard-mode or up to 400Kbps in the fast-mode. The
level of logic “0” and logic “1” is dependent of associated value
of V DD as per electrical specification table. One clock pulse is
generated for each data bit transferred.
Data Validity
The data on the SDA line must be stable during the HIGH
period of the clock. The HIGH or LOW state of the data line
can only change when the clock signal on the SCL line is
LOW. Refer to Figure 1.
SDA
SCL
This IC is protected against overheating. When the junction
DATA LINE
STABLE
CHANGE
OF DATA
temperature exceeds 150°C (typical), the step-up converter
and the linear regulator are shut off and the OTF bit of the
SR is set HIGH. Normal operation is resumed and the OTF
bit is reset LOW when the junction is cooled down to 135°C
(typical).
In over temperature conditions, the OTF Flag goes HIGH
and the I 2 C data will be cleared. The user may need to
monitor the I 2 C enable bits and OTF flag continuously and
enable the chip, if I 2 C data is cleared. OTF conditions may
also make the OLF flags go HIGH, when high capacitive
loads are present or self-heating conditions occur at higher
loads.
External Output Voltage Selection
The output voltage can be selected by the I 2 C bus.
DATA VALID ALLOWED
FIGURE 1. DATA VALIDITY
START and STOP Conditions
As shown in Figure 2, START condition is a HIGH to LOW
transition of the SDA line while SCL is HIGH.
The STOP condition is a LOW to HIGH transition on the SDA
line while SCL is HIGH. A STOP condition must be sent
before each START condition.
SDA
SCL
Additionally, the QFN package offers two pins (SEL18V1,
SEL18V2) for independent 13V/18V output voltage
selection. When using these pins, the I 2 C bits should be
S
START
CONDITION
P
STOP
CONDITION
initialized to 13V status.
8
FIGURE 2. START AND STOP WAVEFORMS
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6405ERZ-T | 功能描述:线性稳压器 - 标准 VER OF ISL6405ER-T RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| ISL6405EVAL1 | 功能描述:EVALUATION BOARD 1 ISL6405 RoHS:否 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ISL6405EVAL2 | 功能描述:EVALUATION BOARD 2 ISL6405 RoHS:否 类别:编程器，开发系统 >> 过时/停产零件编号 系列:- 标准包装:1 系列:- 传感器类型:CMOS 成像，彩色（RGB） 传感范围:WVGA 接口:I²C 灵敏度:60 fps 电源电压:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相关产品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
| ISL6405EVAL2Z | 功能描述:EVAL BOARD 2 FOR ISL6405 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:* 标准包装:1 系列:- 主要目的:DC/DC，步降 输出及类型:1，非隔离 功率 - 输出:- 输出电压:3.3V 电流 - 输出:3A 输入电压:4.5 V ~ 28 V 稳压器拓扑结构:降压 频率 - 开关:250kHz 板类型:完全填充 已供物品:板 已用 IC / 零件:L7981 其它名称:497-12113STEVAL-ISA094V1-ND |
| ISL6405I2C-KIT-EVAL | 功能描述:EVALUATION BOARD I2C ISL6405 RoHS:否 类别:编程器，开发系统 >> 过时/停产零件编号 系列:- 标准包装:1 系列:- 传感器类型:CMOS 成像，彩色（RGB） 传感范围:WVGA 接口:I²C 灵敏度:60 fps 电源电压:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相关产品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
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