LM3492HCQMH datasheet(5/29 Pages) TI1

部品番号	LM3492HCQMH

部品情報	Two-Channel, Individual Dimmable LED Driver

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LM3492HC-Q1, LM3492HC

www.ti.com

SNVS797B – MARCH 2012 – REVISED OCTOBER 2015

7.4 Thermal Information

LM3492HC

PWP

THERMAL METRIC(1)

UNIT

(HTSSOP)

20 PINS

RθJA

Junction-to-ambient thermal resistance

36.8

°C/W

RθJC(top)

Junction-to-case (top) thermal resistance

21.8

°C/W

RθJB

Junction-to-board thermal resistance

18.3

°C/W

ψJT

Junction-to-top characterization parameter

0.6

°C/W

ψJB

Junction-to-board characterization parameter

18.1

°C/W

RθJC(bot)

Junction-to-case (bottom) thermal resistance

2

°C/W

(1)

For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application

report, SPRA953.

7.5 Electrical Characteristics

over operating free-air temperature range, VIN = 12 V (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

START-UP REGULATOR (VCC PIN)

CVCC = 0.47 µF, no load

4.7

5.5

6.3

V

VVCC

Output voltage

IVCC = 2 mA

4.7

5.5

6.3

V

VCC pin undervoltage lockout

VCC_UVLO

VVCC increasing, TA = TJ = 25°C

3.56

3.78

4

V

threshold (UVLO)

VCC_UVLO-HYS

VCC pin UVLO hysteresis

VVCC decreasing, TA = TJ = 25°C

310

mV

IIN

IIN operating current

No switching, VFB = 0 V

3.6

5.2

mA

IIN operating current, device

IIN-SD

VEN = 0 V

30

95

µA

shutdown

IVCC

VCC pin current limit (1)

VVCC = 0 V

18

30

mA

VCC pin output voltage when

VIN = Open, IVCC = 1 mA,

VCC-VOUT

3.5

4.1

4.7

V

supplied by VOUT

VOUT = 18 V

ENABLE INPUT

VEN

EN pin input threshold

VEN rising

1.55

1.63

1.71

V

VEN-HYS

EN pin threshold hysteresis

VEN falling

194

mV

IEN-SHUT

Enable pullup current at shutdown

VEN = 0 V

2

µA

Enable pullup current during

IEN-OPER

VEN = 2 V

40

µA

operation

CURRENT REGULATOR

VIREF

IREF pin voltage

4.5 V

≤ VIN ≤ 65 V

1.231

1.256

1.281

V

VDHC50

IOUT = 50 mA, RIREF = 25 kΩ

0.160

0.225

0.290

VDHC100

IOUT = 100 mA, RIREF = 12.5 kΩ

0.38

0.48

0.58

VIOUT under DHC

V

VDHC200

IOUT = 200 mA, RIREF = 6.25 kΩ

0.81

0.99

1.17

VDHC250

IOUT = 250 mA, RIREF = 5 kΩ

0.81

1.21

1.44

(1)

The VCC pin provides self bias for the internal gate drive and control circuits. Device thermal limitations limit external loading.

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