MAX16812ATI/V+【PDF 4/21 页】IC LED DRIVR HIGH BRIGHT 28-TQFN

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Integrated High-Voltage LED Driver

with Analog and PWM Dimming Control

ELECTRICAL CHARACTERISTICS (continued)

(V IN = V EN = 12V, C L_REG = 3.3μF, C H_REG = 1μF, C REF = 47nF, V TGRM = 0V, R SRC = 0.2 Ω , R CS = 1 Ω , T A = T J = -40°C to +125°C,

unless otherwise noted. Typical values are at T A = +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

HIGH-SIDE DIMMING LINEAR REGULATOR ((V HV - V LV ) = 21V)

V LV = V CS- , (V CS+ - V CS- ) = 0.3V,

(V DD - V LV ) = 1V, V DIM = 1V, V TGRM = 0V,

V DGT = 1V, V REFI = 1.0V, sinking

1.2

Minimum Output Current

I DGT

V LV = V CS- , (V CS+ - V CS- ) = 0.2V,

(V DD - V LV ) = 1V, V TGRM = 0V, V DGT = 3V,

V REFI = 1.0V, V DIM = 1V, sourcing

1.2

mA

Output Voltage Range

DC Gain

C DGT = 1nF to LV

0.2

60

5.0

V

dB

DD Input Bias Current

I DD

(V DD - V CS -) = 0.5V

-3

+3

μA

DD Input Low Threshold

V TGRM = 0V, V DIM = 1V, V REFI = 1.2V,

(V DGT - V LV) > 1.5V, V DD falling

0.25

0.50

0.75

V

DIMMING ((V HV - V LV ) = 21V)

DIM Input Bias Current

TGRM Input High Threshold

I DIM

V DIM = 1.1V

-1

1.18

1.23

+1

1.27

μA

V

TGRM Reset High-to-TGRM Low

Pulse Width

1

μs

TGRM Reset Switch R DS(ON)

Dimming Rise and Fall LED

Current Times

V TGRM = 1.3V

5

20

Ω

μs

OVERVOLTAGE PROTECTION (OV)

OV Input High Threshold

V OV rising

1.180

1.230

1.292

V

OV Input Threshold Hysteresis

14

mV

OV Input Bias Current

I OV

V OV = 1.1V

-1

+1

μA

INTERNAL OSCILLATOR CLOC K

Internal Clock Frequency

f OSC

RT = 2M Ω to AGND

RT = 50k Ω to AGND

470

105

525

125

570

155

kHz

SLOPE COMPENSATION INPUT (SLP)

SLP Input Current

I SLP

V SLP = 0V

150

μA

LOW-SIDE GATE DRIVE (DRV)

DRV Output Low Impedance

DRV Output High Impedance

R DRV_LO

R DRV_HI

DRV sinking 20mA

DRV sourcing 20mA

3

10

30

45

Ω

Ω

INTERNAL POWER MOSFET

GT Input Leakage Current

Internal MOSFET Gate-to-Source

Threshold Voltage

V TH

V GT = 0 to 5V

-1

2.5

+1

μA

V

Internal MOSFET Gate Charge

Q g

V LX = 50V

8

nC

4

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