LP8556 datasheet(9/63 Pages) TI1

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LP8556

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SNVS871I – JULY 2012 – REVISED MARCH 2016

Product Folder Links: LP8556

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(1)

Minimum (MIN) and Maximum (MAX) limits are specified by design, test, or statistical analysis. Typical numbers are not verified, but do

represent the most likely norm.

(2)

Output Current Accuracy is the difference between the actual value of the output current and programmed value of this current.

Matching is the maximum difference from the average. For the constant current sinks on the part (OUT1 to OUT6), the following are

determined: the maximum output current (MAX), the minimum output current (MIN), and the average output current of all outputs (AVG).

Two matching numbers are calculated: (MAX-AVG)/AVG and (AVG-MIN/AVG). The largest number of the two (worst case) is

considered the matching figure. The typical specification provided is the most likely norm of the matching figure for all parts. Note that

some manufacturers have different definitions in use.

(3)

Verified by design and not tested in production.

(4)

Saturation voltage is defined as the voltage when the LED current has dropped 10% from the value measured at 1 V.

7.7 Electrical Characteristics — LED Driver

over operating free-air temperature range (unless otherwise noted)

(1)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ILED_LEAKAGE

Leakage current

Outputs LED1...LED6, VOUT = 48 V

0.1

µA

ILED_MAX

Maximum sink current

LED1...LED6

ILED

LED current accuracy(2)

Output current set to 23 mA

–3%

Output current set to 23 mA,

–30°C

≤ TA ≤ 85°C

–4%

IMATCH

Matching

Output current set to 23 mA

0.5%

PWMDUTY

LED PWM output pulse duty

cycle(3)

100 Hz < fPWM ≤ 200 Hz

0.02%

100%

200 Hz < fPWM ≤ 500 Hz

0.02%

100%

500 Hz < fPWM ≤ 1 kHz

0.02%

100%

1 kHz < fPWM ≤ 2 kHz

0.04%

100%

2 kHz < fPWM ≤ 5 kHz

0.1%

100%

5 kHz < fPWM ≤ 10 kHz

0.2%

100%

10 kHz < fPWM ≤ 20 kHz

0.4%

100%

20 kHz < fPWM ≤ 30 kHz

0.6%

100%

30 kHz < fPWM ≤ 39 kHz

0.8%

100%

fLED

PWM output frequency

PWM_FREQ = 1111

38.5

kHz

VSAT

Saturation voltage(4)

Output current set to 23 mA

200

(1)

Minimum (MIN) and Maximum (MAX) limits are specified by design, test, or statistical analysis. Typical numbers are for information only.

(2)

Verified by design and not tested in production.

7.8 Electrical Characteristics — PWM Interface

(1)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

fPWM

PWM frequency range(2)

25 000

tMIN_ON

Minimum pulse ON time

μs

tMIN_OFF

Minimum pulse OFF time

tSTARTUP

Turnon delay from standby to

backlight on

PWM input active, VDDIO pin transitions

from 0 V to 1.8 V

tSTBY

Turnoff delay

PWM input low time for turnoff

PWMRES

PWM input resolution

ƒIN < 9 kHz

bits

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