LP8553

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SNVS701B – SEPTEMBER 2011 – REVISED JANUARY 2014

LED Driver Electrical Characteristics (continued)

Symbol

Parameter

Condition

Min

Typ

Max

Units

10

9

8

PWM Output Resolution

bits

(2)

13

12

11

PWM_FREQ[4:0] = 00000b

600

PLL clock 5 MHz

LED Switching Frequency

Hz

(2)

PWM_FREQ[4:0] = 11111b

19.2k

PLL clock 5 MHz

Output current set to 20 mA

105

220

mV

Output current set to 30 mA

160

290

(2)

PWM output resolution and frequency depend on the PLL settings. Please see PWM Frequency Setting for full description

(3)

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

PWM Interface Characteristics

Symbol

Parameter

Condition

Min

Typ

Max

Units

PWM Frequency Range

0.1

25

kHz

Minimum Pulse ON time

1

μs

Minimum Pulse OFF time

1

Turn on delay from standby to

PWM input active, EN pin rise from low to

6

ms

backlight on

high

PWM input low time for turn off, slope

Turn Off Delay

50

ms

disabled

10

11

PWM Input Resolution

bits

12

13

Under-Voltage Protection

Symbol

Parameter

Condition

Min

Typ

Max

Units

UVLO[1:0] = 00

Disabled

UVLO[1:0] = 01, falling

2.55

2.70

2.94

UVLO[1:0] = 01, rising

2.62

2.76

3.00

UVLO[1:0] = 10, falling

5.11

5.40

5.68

V

UVLO[1:0] = 10, rising

5.38

5.70

5.98

UVLO[1:0] = 11, falling

7.75

8.10

8.45

UVLO[1:0] = 11, rising

8.36

8.73

9.20

Logic Interface Characteristics

Symbol

Parameter

Condition

Min

Typ

Max

Units

Logic Input EN

Input Low Level

0.4

V

Input High Level

1.2

V

Input Current

−1.0

1.0

μA

Logic Input VSYNC

Input Low Level

0.4

V

Input High Level

2.2

V

Input Current

−1.0

1.0

μA

Frequency Range

58

60

55000

Hz

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