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參數(shù)資料
| 型號： | ISL6405 |
| 廠商： | Intersil Corporation |
| 英文描述： | Dual Output LNB Supply and Control Voltage Regulator with I2C Interface for Advanced Satellite Set-top Box Designs |
| 中文描述： | 雙輸出LNB電源和控制穩(wěn)壓器，帶有I2C接口的先進衛(wèi)星機頂盒設計 |
| 文件頁數(shù)： | 8/13頁 |
| 文件大小： | 341K |
| 代理商： | ISL6405 |
8
This feature only affects the turn-on and programmed
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
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
This IC is protected against overheating. When the junction
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.
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
initialized to 13V status.
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.
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.
TABLE 1.
I
2
C BITS
SEL18V (1, 2)
O/P VOLTAGE
13V
Low
13V
14V
Low
14V
13V
High
18V
14V
High
19V
SDA
SCL
DATA LINE
STABLE
DATA VALID
CHANGE
OF DATA
ALLOWED
FIGURE 1. DATA VALIDITY
SDA
SCL
START
CONDITION
FIGURE 2. START AND STOP WAVEFORMS
STOP
CONDITION
S
P
ISL6405
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| ISL6405EEB | 功能描述:IC VOLT REG DUAL LNB 28-EPSOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,000 系列:- 應用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應商設備封裝:42-WLP 包裝:帶卷 (TR) |
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