TLC5948APWPR.B datasheet(20/54 Pages) TI2

20 / 54 page

TLC5948A

SBVS192A – MARCH 2012 – REVISED DECEMBER 2012

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Table 3 and Table 4 summarize the BC data versus the set current value.

Table 3. BC Data versus Constant-Current Ratio and Set Current Value

BC DATA

RATIO OF

OUTPUT

IOUT (mA)

CURRENT TO

(IOLCMax= 45 mA,

(IOLCMax= 2 mA,

BINARY

DECIMAL

HEX

DC DATA (Hex)

IOLCMax(%)

typ)

000 0000

25.0

11.25

0.50

000 0001

25.6

11.52

0.51

000 0010

26.2

11.78

0.52

—

111 1101

125

98.8

44.47

1.98

111 1110

126

99.4

44.73

1.99

111 1111

127

100.0

45.00

2.00

Table 4. DC and BC Data versus Current Ratio and Set Current Value

RATIO OF OUTPUT

IOUT (mA)

CURRENT TO IOLCMax

(IOLCMax = 45 mA,

IOUT (mA)

BC DATA (Hex)

DC DATA (Hex)

(%)

typical)

(IOLCMax = 2 mA, typical)

12.4

5.58

0.25

12.7

5.71

0.25

13.0

5.84

0.26

—

49.0

22.06

0.98

49.3

22.19

0.99

49.6

22.32

0.99

GRAYSCALE (GS) FUNCTION (PWM CONTROL)

The TLC5948A can adjust the brightness of each output channel using a pulse width modulation (PWM) control

scheme. The architecture of 16 bits per channel results in 65,536 brightness steps, from 0% up to 100%

brightness.

The PWM operation for OUTn is controlled by a 16-bit grayscale (GS) counter. The GS counter increments on

each GS reference clock (GSCLK) rising edge. The GS counter resets to 0000h when the BLANK bit in the first

control data latch is set to '1'; the counter value is held at 0000h while the BLANK bit is '1', even if the GS clock

input is toggled high and low.

The TLC5948A has two types of PWM control: conventional PWM control and enhanced spectrum (ES) PWM

control. The conventional PWM control can be selected when the ESPWM bit in the first control data latch is '0'.

The ES PWM control is selected when the ESPWM bit is '1'.

The on-time (tOUT_ON) of each output (OUTn) can be calculated by Equation 3.

tOUT_ON = tGSCLK × GSn

(3)

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