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

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Sheet目录41

12页 13页 14页 15页 [16页]17页 18页 19页 20页

LDS9003 / 9001

?009 IXYS Corp.

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

Characteristics subject to change without notice

Table 12: Recommended Register Load Sequence for LDS9003/9001

Reg Load

Sequence #

Reg (hex)

Value (hex)

Comments

1Eh

88h (9003) or 00h (9001) Initialize Configuration Register

00h

08h

IPWM1 current @ 1mA

01h

08h

IPWM2 current @ 1mA

02h

08h

IPWM3 current @ 1mA

03h

A2h (9003) or 02h (9001) Set up Led-sense configuration for 9003 & 9001

04h

00h

Global PWM Dimming 00h is full ON = 100% DC

05h

FBh

Duty Cycle code for IPWM1. Use set FBh=95% DC

06h

FBh

Same as reg 05h

07h

FBh

Same as reg 05h

10*

49h

00h

Ta-Tj 0ffset

11*

4Ah

1Eh

Set LED Shutdown temperature 1Eh = 120C

12*

4Bh

1Fh

Set optional 2x PWM adjust step start point; 1x

scale below this point

13*

A0h

36h

Load Si Diode K factor for - 1.71mV/C

14*

A2h

User Loads Per LED Used

User loads LED K factor @ 1mA I

4Bh = -2.3mV/C for Luxeon Rebel WLED

A4h

User Loads Per LED Used

User loads LED K factor @ 1mA I

for LED1

4Bh = -2.3mV/C for Luxeon Rebel WLED

A6h

User Loads Per LED Used User loads LED K factor @ 1mA I

for LED2

17*

C0h

40h

Load Si Diode h factor = 1.0

18*

D4h

04h

Load Si Diode Rs = 68 ohms

19*

D6h

User Loads Per LED Used

User loads LED Rs for LED1

0Ah = 1.4 ohms for Luxeon Rebel WLED

D8h

User Loads Per LED Used User loads LED Rs for LED2

DAh

User Loads Per LED Used User loads LED Rs for LED3

22-47*

50h 5Fh User Loads Per LED Used LUT1 correction Table

48-64

60h 7Fh User Loads Per LED Used LUT2 correction Table

65-80

70h 7Fh User Loads Per LED Used LUT3 correction Table

81*

1Fh

10h

User issues temp calibration command

The advantage of PWM dimming is stable LED color

temperature / wavelength that is determined by the

maximum static mode LED current value set by the

external HB LED driver. The integrated PWM

generator reduces the system requirement to provide

a continuous pulsed waveform, and is automatically

adjusted by the LED-Sense

algorithm to maintain

the programmed Temperature vs PWM DC thermal

control profile.

To use the dynamic PWM mode for LED current

setting, the maximum I

LED

value should first be set by

the HB LED Driver current setting resistor (per

vendor specifications) and the desired dimming / user

duty cycle can be set by registers 05h, 06h, and 07h.

The logarithmic operating mode provides a dimming

resolution of approximately -0.17 dB per step with

0dB dimming (i.e. 100% duty cycle) at the 256

step

(i.e. FFh), and 0% duty cycle (~ -80 dB dimming) at

00h.

Figure 8 shows the dimming transfer function for

dimming level in dB (from maximum level) vs

programmed data code (decimal).

Figure 9 shows the dimming transfer function for

dimming level in percent (%) vs programmed data

code (decimal). 0% dimming is full ON brightness

(i.e. PWM duty cycle = 100%).

generators so is especially helpful in applications

using the LDS9003. It is recommended that the user

use registers 05h, 06h, and 07h to establish the

desired duty cycle at ambient room temperature (i.e

25篊) conditions that account for further LED-

Sense

adjustment over temperature per the

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