參數(shù)資料
型號： LDS89001008-T2
廠商： IXYS CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, PDSO8
封裝： 3 X 2 MM, ROHS COMPLIANT, MO-220, DFN-8
文件頁數(shù)： 10/30頁
文件大?。?/td> 622K
代理商： LDS89001008-T2
LDS9003 / 9001
2009 IXYS Corp.
18
Doc. No. 9003/9001_DS, Rev. N1.0
Characteristics subject to change without notice
50h to 5Fh, 60h to 6Fh, and 70h to 7Fh store the
correction profiles for LUT1, LUT2, and LUT3
respectively.
Figure 11: Global Dimming in Logarithmic Mode
in percent vs. register 04h data
(0% dimming = full LED brightness)
Each register stores a 4 bit adjustment code for two
5C temperature steps in its lower (bits 3:0) and
higher (bits 7:4) nibble. User loadable PWM
correction codes in the 1x scale mode represent 0 to
-7 PWM de-rating steps. In the 2 x scale mode the
correction codes represent 0 to -14 PWM steps.
Additionally, the IPWM current sources are disabled
(i.e. 0 DC current = 0% PWM duty cycle) if the
measured LED junction temperature exceeds a
preset value that is loaded in register 4Ah
The LED-Sense
TM engine periodically measures the
LED
junction
temperature
on
three
TSENSEx
channels (just TSENSE for LDS9001) and encodes
the
value into
5-bit
T-codes
representing
5
0C
temperature intervals from -35 to +120
0C.
The measured T-code value addresses the stored
ΔPWM correction codes stored in the LUT registers
to adjust the PWM duty cycle. Therefore this reduces
the average current through the LEDs as defined by
the LUT table.
The user loads specific
ΔPWM correction codes into
the LUT(s) for every 5C temperature step from
-
35C to 120C, as prior discussed, to meet desired
current and power vs LED junction temperature.
LUT correction codes are subtracted from the user-
set duty cycle/dimming code (dynamic mode) loaded
in registers 05h, 06h, and 07h and the global
dimming level code, if used, to maintain reliable LED
current levels.
The LDS9003/9001 includes a 10-bit ADC and digital
processing engine to determine LED temperatures
approximately every 2.5 seconds. The proprietary
LED-Sense
TM algorithm allows direct measurement of
LED junction temperatures on the TSENSEx sensing
channels,
without
the
need
for
an
external
temperature sensor. Additionally an on-chip silicon
temperature sensing diode is also measured to
enhance temperature estimation accuracy.
I
2C Interface
The LDS9003/9001 uses a 2-wire serial I
2C-bus
interface. The SDAT and SCLK lines comply with the
I
2C electrical specification and should be terminated
with pull-up resistors to the logic voltage supply.
When the bus is not used, both lines are high. The
device supports a maximum bus speed of 400kbit/s.
The serial bit sequence is shown at REGISTER
DEFINITION AND PROGRAMMING section for read
and write operations into the registers. Read and
write
instructions
are
initiated
by
the
master
controller/CPU and acknowledged by the slave LED
driver.
The LDS9003/9001 allows user to choose between
two
I
2C addresses by connecting SADD pin (#3)
either to ground, or VIN pin (see Table ).
Table 13: LDS9003/9001 I
2C Slave Addresses
I
2C Address
SADD pin
connected to
Binary code
Hex
Ground
001 0001
11h
VIN
101 0101
55h
For further details on the I
2C protocol, please refer to
the I
2C-Bus Specification, document number 9398-
393-40011, from Philips Semiconductors.
Over-Temperature Protection
If the die temperature exceeds +150°C, the driver will
enter shutdown mode. The LDS9003/9001 requires
restart after die temperature falls below 130°C.
OPTIONAL USE of EXTERNAL TEMPERATURE
DIODE
The LDS9003/9001 also provides the option for using
an external remote temperature-sensing diode device
such as a 2N3904. To use this option the diode
anode should be connected to the corresponding
TSENSEx
channel.
The
cathode
should
be
connected to GND.
STANDBY MODE
The LDS9003/9001 has a “soft” standby or sleep
mode, which the customer may set by I
2C interface
by addressing register 1Fh with bit 6 = 1 (see Table
4).
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