EC4211|Constant Current Linear LED Driver


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Constant Current Linear LED Driver

 

 

 

EC4211

FEATURES

Constant LED Current for Varying Input Voltage

Adjusted Current Operation

Low Quiescent Current

Simplifies Circuit and System Designs

Compact Component Count

Provided Higher Current by Parallel

Temperature Compensated Constant Current

Over Current Protection

Over Temperature Protection

LED Current Programmable Thermal Foldback for thermal Protection

SOP-8L Package or DFN-8L Package or

TO252-5L Package

 

APPLICATIONS

LED Driver

Lighting Applications

Lamp Indicators

Candle Light

Low Cost solution

Constant Current Source

Preliminary

GENERAL DESCRIPTION

The EC4211 is a constant current linear LED driver for replace discrete solutions in AC/DC power application (up to 265V). The device is to drive a constant current of ±5% variation by an external resistor for different LED strings. The solution eliminates the need of individual components by combining them into a single package, which results in a significant reduction of both system cost and board space. For higher current application, multiple EC4211s can also be used in parallel such as 40mA, 80mA or 160mA. The EC4211 is self-protected against over temperature and over current. Internal thermal foldback function regulates LED driver current automatically to limit die temperature during high power operation or high ambient temperature conditions. These features provide maximum system protection for the demanding lighting applications. The EC4211 is available in a space saving SOP-8L package, DFN-8L package or TO252-5L package, and the operating temperature is from 40°C to +125°C.

 

 

 

 

 

TYPICAL APPLICATION CIRCUIT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fig. 1 Simplified Application Circuit

 

ABSOLUTE MAXIMUM RATINGS

VIN Supply Voltage...................................................500V

REXT, RGAIN Operation Voltages…................................  6V

Operating Temperature…………………   -40°C to +125°C

Storage Temperature…………………… -55°C to +150°C

Maximum Die Temperature………………………. +150°C

Lead Temperature……………………………….… +260°C

ESD HBM Voltage……………………………....……2.5kV

ESD MM Voltage………………………………………  300V

 

 

 

 

PIN CONFIGURATION

 

 

 

 

 

 

 

Note:

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied. Continuous operation of the device at the absolute rating level may affect device reliability.

 

Ordering Information

Part No.  ​​ ​​​​ 

Package Type  ​​​​ 

Marking Information

Remark

EC4211NNMHR

SOP-8L

 ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ EC4211

 ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ YYWW

 ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ LLLLLT

 

YYWW :Date Code

LLLLL:Lot No

T:internal tracking code

EC4211NNF2R

DFN-8L

 ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ EC4211

 ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ LLLLL

 ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ YYWWT

EC4211NNA5R

TO252-5L  ​​​​ 

 ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ EC4211

 ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ YYWW

 ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ LLLLLT

 

ELECTRICAL CHARACTERISTICS

TA = 25°C unless otherwise specified

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNIT

Electrical Characteristic

VIN

Operation Voltage

 

15

 

265

V

ILED

Current Regulation (Note 1)

VIN=120Vdc, REXT=15Ω, VLED=100V

38.16

40.17

42.18

mA

VIN=220Vdc, REXT=30Ω, VLED=200V

19.16

20.17

21.18

mA

ILED(MAX)

Maximum Current Regulation

VDROP16V (Note 2)

 

 

60

mA

IQ

Quiescent Current

VIN=20Vdc, REXT=Open

 

170

 

µA

VREF

Reference Voltage (Note 3)

 

 

0.6

 ​​ ​​ ​​ ​​​​ 

V

VDROP(MAX)

Maximum Dropout Voltage (Note 4)

VIN= 265Vac, REXT=30Ω, VLED=220V

 

 

170

V

Thermal Characteristic

VREF(T)

VREF Temperature Coefficient

TA=-40°C ~125°C

 

0.01

 

/

TA

Operating Temperature

 

-40

 

125

PD

Total Power Dissipation (Operation)

 

 

 

1

W

RΘJA

Thermal Resistance

SOP-8L Package

 

75

 

/W

DFN-8L Package

 

33.2

 

/W

TO252-5L Package

 

68

 

/W

Protection

OCP

Over Current Protection

 

 

150

 

mA

OTP

Over Temperature Protection

 

 

150

 

TFP

Thermal Foldback Protection (Note 5)

 

 

90

 

Note:

1. ILED=0.6/REXT+IQ

2. VDROP=VIN-VLED-0.6, PD<1W (No heat sink)

3. VREF=V(REXT)-VLED

4. The current regulation is for a instantaneous AC line input current only, not to exceed thermal characteristics of package.

5. ILED(TFP)=ILED-V(RGAIN)/RGAIN

 

EC4211

Constant Current Linear LED Driver

 

 

 

FUNCTION DIAGRAM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fig. 2 Detailed Block Diagram

 

 

 

PIN DESCRIPTIONS

TO252-5L Package

PIN

Symbol

Description

1

REXT

An external resistor between REXT and VLED pin sets different current regulation for LED strings.

2

NC

No internal mechanically connection. Leave this pin open. ​​ 

3

VLED

The LED strings are connected from this pin to ground.

4

VIN

Input supply voltage.

5

RGAIN

Programmable thermal foldback protection for current regulation to limit die temperature during high power operation or high ambient temperature conditions.

 

DFN-8L / SOP-8L Package

PIN

Symbol

Description

1

RGAIN

Programmable thermal foldback protection for current regulation to limit die temperature during high power operation or high ambient temperature conditions.

2

VIN

Input supply voltage.

3

NC

No internal mechanically connection. Leave this pin open.

4

REXT

An external resistor between REXT and VLED pin sets different current regulation for LED strings.

5, 6, 7, 8

VLED

The LED strings are connected from these pins to ground.

 

 

ELECTRICAL CHARACTERISTICS (TA = 25°C, unless otherwise specified)

OUTPUT CURRENT

​​ vs. TEMPERATURE

VREF vs. TEMPERATURE

 

VIN=16.5Vdc

REXT=30

RGAIN=Open

 

VIN=16.5Vdc

REXT=30

RGAIN=Open

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VREF vs. INPUT VOLTAGE

OUTPUT CURRENT vs. REXT

 

 

 

REXT=30

RGAIN=Open

VIN=16.5Vdc

RGAIN=Open

 

 

 

 

 

 

 

 

 

 

 

 

QUIESCENT CURRENT

vs. TEMPERATURE

THERMAL FOLDBACK

vs. TEMPERATURE

VIN=16.5Vdc

REXT=30

RGAIN=20k

VIN=16.5Vdc

REXT=Open

RGAIN=Open

 

 

 

 

RGAIN=10k

 

 

 

 

 

 

 

 

 

ELECTRICAL CHARACTERISTICS (Continuted)

TRANSIENT RESPONSE

TRANSIENT RESPONSE

vs. THERMAL FOLDBACK

VIN=130Vac

REXT=Short

RGAIN=Open

 

OVER TEMPERATURE PROTECTION

VIN=60Vdc

REXT=Short

RGAIN=Open

 

OVER CURRENT PROTECTION