TLC5948A Datasheet, PDF(20/50 Page) Texas Instruments – 16-Channel, 16-Bit, ES-PWM, Full Self-Diagnosis LED Driver

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TLC5948A Datasheet, PDF (20/50 Pages) Texas Instruments – 16-Channel, 16-Bit, ES-PWM, Full Self-Diagnosis LED Driver

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TLC5948A

SBVS192 â MARCH 2012

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

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BINARY

000 0000

000 0001

000 0010

111 1101

111 1110

111 1111

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

BC DATA

DECIMAL

125

126

127

HEX

DC DATA (Hex)

RATIO OF

OUTPUT

CURRENT TO

IOLCMax(%)

25.0

25.6

26.2

98.8

99.4

100.0

IOUT (mA)

(IOLCMax= 45 mA,

typ)

11.25

11.52

11.78

44.47

44.73

45.00

IOUT (mA)

(IOLCMax= 2 mA,

typ)

0.50

0.51

0.52

1.98

1.99

2.00

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

BC DATA (Hex)

DC DATA (Hex)

RATIO OF OUTPUT

CURRENT TO IOLCMax

(%)

12.4

12.7

13.0

49.0

49.3

49.6

IOUT (mA)

(IOLCMax = 45 mA,

typical)

5.58

5.71

5.84

22.06

22.19

22.32

IOUT (mA)

(IOLCMax = 2 mA, typical)

0.25

0.26

0.98

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 Ã GSn

(3)

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