34844_08 datasheet(7/36 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

34844

ELECTRICAL CHARACTERISTICS

Line Regulation (8)

VIN=7.0V to 28V

IOUT/VIN

-0.2

0.2

%/V

Load Regulation (8)

VLED = 8.0V to 65V (all Channels)

IOUT/VLED

-0.2

0.2

%/V

Slope compensation voltage ramp

RSLOPE = 68KΩ

VSLOPE

0.49

μs

Current Sense Amplifier Gain

ACSA

9.0

Current Sense Resistor

RSENSE

OTA Transconductance

200

μS

Transconductance Sink and Source Current Capability

ISS

100

μA

Output Voltage Precharge

VHOLD

0.45

0.5

0.55

FAIL PIN

Off-state Leakage Current

VFAIL = 5.5V

IFAIL_LEAK

μA

On-state Voltage Drop

ISINK = 4.0mA

VOL

0.4

LED CHANNELS

Sink Current

ICHx Register = 255, RISET=5.1k

Ω 0.1%, PIN&NIN = Disabled,

TA=25°C

ISINK

Regulated minimum voltage across drivers

Pulse Width > 4

μs

VMIN

675

750

825

Current Matching Accuracy

IMATCH

-2.0

2.0

ISET Pin Voltage

RISET=5.1k

Ω 0.1%

VSET

2.017

2.048

2.079

LED Current Amplitude Resolution

1.0mA < ILED < 50mA

ILEDRES

1.5

Off-state Leakage Current, All channels

(VCH = 45V)

ICH_LEAK

μA

PIN INPUT

Voltage to Disable PIN mode

VPIN_DIS

2.2

PIN Bias Current

PIN = VSET

IPIN

-2.0

2.0

μA

Analog Dimming Current

ICHx Register = 255, RISET=5.1k

Ω 0.1%

PIN = VSET/2

PIN = VSET

IDIM_PIN

23.75

47.50

26.25

52.50

Notes

Guaranteed by design

Table 3. Electrical Characteristics (continued)

Characteristics noted under conditions VIN = 12V, VOUT = 42V, ILED = 50mA, PWM = VDC1, M/~S = VDC1,

PIN & NIN = VDC1, -40

°C ≤ TA ≤ 105°C, PGND = 0V, unless otherwise noted.

Characteristic

Symbol

Min

Typ

Max

Unit

34844 데이터시트(PDF) 7 Page - Freescale Semiconductor, Inc

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