34845B datasheet(7/21 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

34845

ELECTRICAL CHARACTERISTICS

STATIC AND DYNAMIC ELECTRICAL CHARACTERISTICS

LED DRIVER (CONTINUED)

Off State leakage Current, All Channels

VCH = 45 V

ICH_LEAK

1.0

μA

LED Channels Rise and Fall Time

tR/tF

LED Open Protection, Channel Disabled if VCH ≤ OFDV

OFDV

0.55

LED Short Protection Voltage, Channel Disabled if VCH ≥ SFDV

(channel on time

≥ 10 μs)

SFDV

6.5

7.0

7.5

FAIL PIN

Off State Leakage Current

VFAIL = 5.5 V

IFAIL_LEAK

5.0

μA

On State Voltage Drop

ISINK = 4.0 mA

VOL

0.4

OVER-TEMPERATURE SHUTDOWN

Over-temperature Threshold (shutdown mode)

Rising

Hysteresis

OTTSHUTDOWN

150

165

°C

PWM INPUT

PWM Dimming Mode LED Current Control

PWM = 3.3 V, fPWM = 600 Hz 10% duty;

PWM = 3.3 V, fPWM = 600 Hz 50% duty

PWM = 3.3 V, fPWM = 600 Hz 100% duty

PWMCONTROL

9.9

49.5

100

10.1

50.5

Input Minimum Pulse PWM Pin (VPWM=3.3 V)

Start-up (Wake Mode)

Operational (Wake Mode)

Start-up (Enable Mode)

Operational (Enable Mode)

tPWM_IN

1.6

0.4

0.2

μs

Input Frequency Range for PWM Pin

fPWM

100

kHz

WAKE

Shutdown Mode Timeout

tSHUTDOWN

LOGIC INPUTS (PWM)

Input Low Voltage

VILL

-0.3

0.5

Input High Voltage

VIHL

1.5

5.5

Input Current

ISINK

-1.0

1.0

μA

LOGIC INPUTS (EN)

Input Low Voltage

VILL

-0.3

0.5

Input High Voltage

VIHL

2.1

Input Current (VEN = 12 V)

ISINK

6.0

μA

LOGIC INPUTS (WAKE)

Input Low Voltage

VILL

-0.3

0.5

Input High Voltage

VIHL

2.1

5.5

Input Current

ISINK

-1.0

1.0

μA

Table 3. Static and Dynamic Electrical Characteristics (continued)

Characteristics noted under conditions VIN = 12 V, VOUT = 35 V, ILED = 30 mA, fS = 600 kHz, fPWM = 600 Hz - 40°C ≤ TA ≤

°C, unless otherwise noted. Typical values noted reflect the approximate parameter means at TA = 25°C under nominal

conditions, unless otherwise noted.

Characteristic

Symbol

Min

Typ

Max

Unit

34845B Datasheet(PDF) 7 Page - Freescale Semiconductor, Inc

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