TLC5949PWPR datasheet(37/51 Pages) TI

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LSD

LOD

OLD

Control

2 A (typ)

VCC

VLED

PWM

Control

IDM

Control

OUTn

GND

LSD and

OLD Data

LOD Data

Current Flow

for OLD

Current

Flow

for PWM

Current

Flow

for IDM

TLC5949

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SBVS219A – DECEMBER 2012 – REVISED DECEMBER 2012

When LOD and LSD data must be read with invisible brightness, the LATTMG bits should be set to the minimum

data larger than the calculated number of GSCLK periods defined by Equation 4. IDM does not work in power-

save mode. Figure 31 shows the LOD, LSD, OLD, and IDM circuit and Table 15 shows a truth table for LOD,

LSD, OLD, and IDM. Refer to Figure 32 for the PWM operation timing.

Figure 31. LOD, LSD, and OLD Circuit

Table 15. LOD, LSD, OLD, ISF, PTW, and TEF Truth Table

CONDITION

SID DATA

LOD

LSD

OLD

ISF

PTW

TEF

OUTn does not leak to

Device temperature is

GND

Device temperature is

lower than thermal

LED is not opened

LED is not shorted

(VOUTn > VLSD when

IREF terminal is not

lower than pre-thermal

shutdown threshold

(VOUTn > VLOD)

(VOUTn ≤ VLSD)

constant-current

shorted

warning temperature

temperature

output off and OUTn

(temperature

≤ TPTW)

(temperature

≤ TTEF)

source current on)

Current leaks from

OUTn to internal

GND, or OUTn is

Device temperature is

LED is shorted

Device temperature is

shorted to external

IREF terminal is

higher than thermal

LED is open or

between anode and

higher than pre-

GND with high

shorted to GND with

shutdown threshold

shorted to GND

cathode, or shorted to

thermal warning

impedance

low impedance and

temperature and driver

(VOUTn ≤ VLOD)

higher voltage side

temperature

(VOUTn ≤ VLSD when

OUTn are forced off

is forced off

(VOUTn > VLSD)

(temperature > TPTW)

constant-current

(temperature > TTEF)

output off and OUTn

source current on)

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