LDS9003-002-T2【PDF 15/30 页】IC TEMP/PWM CONTROLLER 16WQFN

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LDS9003 / 9001

?009 IXYS Corp.

Doc. No. 9003/9001_DS, Rev. N1.0

Characteristics subject to change without notice

can re-enable the channels by re-writing to the

channel enable bits in register 03h, however the OT

flag will still remain HIGH, until the device is power

sequenced, reset, or placed in the shutdown mode.

If a Ta-Tj offset is used other than 00h (i.e. 0篊) in

temperature loaded in 4Ah should also include this

offset. This insures the LED shutdown is also properly

referenced to the same reference temperature level

IXYS can provide customers with software support to

generate the LUT data tables. In addition, a separate

applications report can be obtained. Please consult a

sales representative or the factory to obtain.

Table 11: PWM LUT Register Load Example

LUT1

LUT2

LUT3

Address (hex) Data (hex) Address (hex) Data (hex) Address (hex) Data (hex)

78D

Recommended User Register Initialization

Table 12 is provided as a recommended user I

LDS9003 and LDS9001 respectively. Register load

(i.e. write) steps marked with * mean LDS9001

steps, as well as LDS9003. Data value entries in

RED indicate the data value is user / system

dependent. Values shown for these registers are for

example only.

IPWM Current Setting & Interface

IPWMx Current setting registers 00h 02h should

be programmed to 08h using the I

C interface to set

the peak DC level current for the IPWM current

source(s). This sets for 1mA ?% DC current, and

the LDS9003 LED-Sense

configuration code 2Ah,

or 02h for LDS9001, should be programmed using

IPWMx are current source outputs. Users must

connect an external resistor to GND from each

output to establish the peak to peak PWM voltage

level required by the HB LED driver. This is depicted

in Figure 7.

Figure 7: Setting up PWM Voltage Level to HB LED

Driver

Digital dimming using the internal PWM generator

changes the duty cycle per the value set in registers

05h, 06h, and 07h and therefore adjusts the average

LED current. This is referred to as dynamic mode.

For dynamic mode, the LDS9003/9001 integrates a

digital PWM generator(s) that operates at a frequency

of ~ 285 Hz. It operates in Logarithmic Mode. The

PWM generator has 12-bit resolution and can be

programmed with an 8-bit code to provide 256

internally mapped 12-bit logarithmic duty cycle steps

to adjust the dimming level

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