LDS9003-002-T2【PDF 7/30 页】IC TEMP/PWM CONTROLLER 16WQFN

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Sheet目录41

3页 4页 5页 6页 [7页]8页 9页 10页 11页

LDS9003 / 9001

?009 IXYS Corp.

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

Characteristics subject to change without notice

ADDRESS DESCRIPTION

BITS NOTES

Bit [3:0] = Tj-Ta offset for the Si diode.

Typically should set both offsets to be equal.

See Table 5 & 6

4Ah

LED Shutdown

Temperature

Defines T-code, at which IPWMs channels are shut down

(i.e. 0% duty cycle) per LED vendor reliability and de-rating

specification (see Table 5); Factory default value = 11100

(bin) = 1Ch represents 105

C Tj

4Bh

2-x Table enable and

breakpoint (T-code)

Bit 5 = 1 enables 2-x scale LUT ?PWM code correction (de-

rating) starting at the breakpoint set by T-code (bits 4:0)

Bit 5 = 0 ; 1x scale (default) for entire temperature range

Bit [4:0] defines T-code, where temperature de-rating starts,

or where 2x scaling begins (see Table 6)

50h 5Fh

Temp vs IPWM1 DC LUT

-35C to 120C

(one 5C step every

nibble)

(IPWM LUT for 9001)

?PWM code1[7:4],

?PWM code0[3:0]

?PWM code 31[7:4],

?PWM code 30[3:0]

Two LUT words per I

C address.

Each word contains two 4-bit numbers representing of ?PWM

codes. See

Table 6 and Appendix 1 for LUT programming.

60h 6Fh

Temp vs IPWM2 DC LUT

-35C to 120C

(one 5C step every

nibble)

?PWM code1[7:4],

?PWM code0[3:0]

?PWM code 31[7:4],

?PWM code 30[3:0]

Same as above for regs 50h-5Fh

Not used for 9001

70h 7Fh

Temp vs IPWM3 DC LUT

-35C to 120C

(one 5C step every

nibble)

?PWM code1[7:4],

?PWM code0[3:0]

?PWM code 31[7:4],

?PWM code 30[3:0]

Same as above for regs 50h -5Fh

Not used for 9001

A0h

Silicon diode dV

/dT [7:0]

Silicon diode V

temperature coefficient (K factor) :

Factory recommended loaded value is 36h = -1.71 mV/癈

= 001 10110 (bin),

where bits from bit 7 to bit 5 represent integer part

[1(decimal)= 001 (bin)], and bits from bit 4 to bit 0 fractional

part [0.710 / 0.03125 = 22 (decimal) = 10110 (bin)]

A2h

LED1 dV

/dT [7:0]

(connected to TSENSE1;

TSENSE for 9001)

User-loaded V

temperature coefficient @ 1mA for LEDs

used at TSENSE1 (TSENSE for 9001)

Negative tracking is assumed with temperature;

Bits from bit 7 to bit 5 represent integer part and

bits from bit 4 to bit 0 - fractional part of the coefficient

Example: Temperature coefficient = -2.26 mV/

Bit 7 bit 6 = 2 (decimal) = 010 (bin), and

Bit 4 bit 0 = INT{0.26 / 0.03125} = 8 (decimal) = 01000 (bin)

User loads 010 01000 (bin) = 48h = -2.25 (closest setting)

A4h

LED2 dV

/dT [7:0]

(connected to TSENSE2)

Same as above reg A2h

Not used for 9001

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