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參數資料
| 型號： | LDS89001008-T2 |
| 廠商： | IXYS CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO8 |
| 封裝： | 3 X 2 MM, ROHS COMPLIANT, MO-220, DFN-8 |
| 文件頁數： | 4/30頁 |
| 文件大?。?/td> | 622K |
| 代理商： | LDS89001008-T2 |
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LDS9003 / 9001
2009 IXYS Corp.
12
Doc. No. 9003/9001_DS, Rev. N1.0
Characteristics subject to change without notice
BLOCK DIAGRAM
Figure 2: LDS9003 / 9001 Functional Block Diagram
BASIC OPERATION
The LDS9003/9001 may operate in the following
modes:
a) Normal Operation Mode
b) Normal Standby Mode
c)
Programming Modes
d) Shutdown Mode
NORMAL OPERATION MODE
At power-up, VIN should be in the range from 2.5 V to
5.5 V (max). If VIN is slow rising, EN pin should be
logic LOW at least until VIN reaches a 2.5 V level.
When EN is taken HIGH, a soft-start power-up
sequence begins and performs an internal circuits
reset that requires less than 100 s.
An initialization sequence then begins, taking less
than 10 ms. This sequence determines the user-
selected
I
2
C
slave
address
and
loads
factory
programmed settings
At
this
point,
the
I
2C interface is ready for
communication and the LDS9003 / 9001 may be user-
programmed. Upon programming completion for all
required
initial
“boot”
parameters
a
calibration
command is given by setting bit 4 of the Control
Register (1Fh) HIGH. This starts the calibration
sequence of the LDS9003 / 9001 LED-Sense
TM
temperature sensing and measurement circuits and
occurs simultaneous with a gradual ramp-up of the
PWMs and current levels to the user programmed
values. This initialization is completed in less than 250
ms in the default soft-start ramp mode, or s less than
PWM3
IPWM3
(only 9003)
TSENSE2
(only 9003)
ADC
10 bit SAR
10
Pre-Scale
8x, 1x, or 1/4x
1 mA
0.2 mA
1 0 uA
2 uA
Si PNP
temp diode
Si Iforce
LED Iforce
Bandgap
Voltage
Reference
1.2V
Calibrated
Reference
Currents
and
ADC bias
currents
TSENSE1
TSENSE (9001)
PWM1
8 bit to 12 bit (log) PWM
Generator
to PWM1
PWM2
8 bit to 12 bit (log) PWM
Generator
to PWM2
PWM3
8 bit to 12 bit (log) PWM
Generator
to PWM3
Digital Temperature
Sensor / Abritrator
Temp
Compensation
Tables
Temp to PWM
adjust LUTs
LUT1
LUT2
LUT3
I2C Interface
Top Level Control
diagnostics
Shorted LED
Open LED
LED Calibration
Soft Start control
OverTemp
1.2V
Vin to 1.8V LDO
f
or digital core
Vin
1.8V
Gnd
POR
Start Up
To top control
Oscillator & Clock Generator
~ 1.2 MHz
to top control & dig processing
Vin
Vin to
al l
Drivers
VIN
SCL
K
SDA
T
SADD
GND
EN
1.2V
PWMA
IPWM1
IPWM (9001)
PWM2
IPWM2
(only 9003)
TSENSE3
(only 9003)
1mA
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