LM3447MT datasheet(3/25 Pages) TI1

Part #	LM3447MT

Description	Phase Dimmable, Primary Side Power Regulated PFC Flyback Controller for LED Lighting

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Manufacturer	TI1 [Texas Instruments]

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LM3447

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SNOSC65 A – APRIL 2012 – REVISED MAY 2012

RECOMMENDED OPERATING CONDITIONS

(1)

over operating free-air temperature range (unless otherwise noted)

MIN

TYP

MAX

UNIT

VCC

Input Voltage

7.5

14

17.5

V

IBIAS

BIAS current from a high impedance source

500

μA

IVAC

VAC current from a high impedance source

500

μA

TJ

Operating junction temperature

–40

25

125

°C

(1)

For specified performance limits and associated test conditions, see the Electrical Characteristics table.

ELECTROSTATIC DISCHARGE (ESD) PROTECTION

MAX

UNIT

Human Body Model (HBM)

2

kV

Field Induced Charged Device Model (FICDM)

750

V

ELECTRICAL CHARACTERISTICS

Unless otherwise specified –40°C < TJ = TA < 125°C, VCC = 14V, VTSNS = 1.75V, VFLT2 = 1.75V, VAUX = 0.5V, VINV = 0V, SP

IVAC = 100μA, IBIAS = 100μA, CVCC = 10μF, CCOMP = 0.047μF, RHLD = 10kΩ.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

INPUT SUPPLY (VCC)

Rising threshold

9.5

10.5

11.5

V

VCC(UVLO)

Falling threshold

6.8

7.5

8.3

V

Hysteresis

3

V

Rising threshold

17.7

18.89

20.1

V

VCC(OVP)

Falling threshold

17.5

18.72

19.9

V

Hysteresis

175

mV

Startup current

VCC = 6.7V, VINV = 0 V

180

μA

IVCC

Standby current

VINV = 1.75V, VAUX = 1 V

1.6

mA

Switching current

CGATE = 1 nF

3.3

mA

INPUT VOLTAGE FEEDFORWARD and ANGLE DETECTION (VAC, FF)

VAC(CLAMP)

VAC clamp voltage

1.24

V

IVAC(ANGLE)

Dimmer angle detect threshold

Sweep IVAC

66

μA

IVAC(HOLD)

HOLD FET turn-on threshold

Sweep IVAC, VFLT2 = 0 V

95

μA

IFF

Feedforward source current

VGATE = VCC, IVAC = 100 µA

10

μA

DIMMING DECODER CIRCUIT (FLT1, FLT2)

FLT1(HIGH)

FLT1 voltage high

FLT1 open

1.67

1.75

1.83

V

FLT2(MIN)

Minimum dimming decode voltage

VFLT2 falling

263

290

315

mV

G(DECODE)

Decode gain, VINV/VFLT2

0.877

FLT2HOLD(EN)

HOLD circuit enable threshold

VFLT2 falling

1

V

FLT2HOLD(DIS)

HOLD circuit disable threshold

VFLT2 rising

1.2

V

HOLD CIRCUIT (HOLD)

RDS(ON)

HOLD MOSFET on-resistance

IVAC = 50 μA, VFLT2 = 1 V

24

Ω

PRE-REGULATOR GATE BIAS CIRCUIT (BIAS)

BIAS(HIGH)

BIAS high voltage clamp

VCC < VCC(UVLO)

16.1

17.7

19.3

V

BIAS(LOW)

BIAS low voltage clamp

VCC > VCC(UVLO)

12.3

13.5

14.7

V

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