Datasheet TLE 4242 G Datasheet (lnfineon)

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Adjustable LED Driver

Features

• Adjustable constant current up to 500 mA (

• Wide input voltage range up to 42 V

• Low drop voltage

• Open load detection

• Overtemperature protection

• Short circuit proof

• Reverse polarity proof

• Wide temperature range: -40

Functional Description

°C to 150 °C

TLE 4242 G

±5%)

P-TO263-7-1

The TLE 4242 G is an integrated adjustable constant current source driving loads up to
500 mA. The output current level can be adjusted via an external resistor. The IC is
designed to supply high power LEDs (e.g. Osram Dragon LA W57B) under the severe
conditions of automotive applications resulting in constant brightness and extended LED
lifetime. It is provided in the surface mounted P-TO263-7-1 package. Protection circuits
prevent damage to the device in case of overload, short circuit, reverse polarity and
overheat. The connected LEDs are protected against reverse polarity as well as excess
voltages up to 45 V.

The integrated PWM input of the TLE 4242 G permits LED brightness regulation by
pulse width modulation. Due to the high input impedance of the PWM input the LED
driver can be operated as a protected high side switch.

Type Ordering Code Package

TLE 4242 G Q67006-A9674 P-TO263-7-1

Data Sheet 1 Rev. 1.0, 2004-01-01

Circuit Description

TLE 4242 G

PWM

1

I

Bias Supply

2

Bandgap

Reference

Comparator

Status

Delay

4

GND D

6

AEB03500.VSD

7

Q

5

REF

3

ST

Figure 1 Block Diagram

An external shunt resistor in the ground path of the connected LEDs is used to sense the
LED current. A regulation loop helds the voltage drop at the shunt resistor on a constant
level of typ. 177 mV. Selecting the shunt resistance permits to adjust the appropriate
constant current level. The typ. output current calculates

V

I

Qtyp,

where
equation applies in a range of 0.39

REF

------------=

R

REF

V

is the reference voltage with a typical level of 177 mV (see Page 10). The

REF

Ω ≤ R

≤ 1.8 Ω.

REF

(1)

The output current is shown as a function of the reference resistance on Page 10. With
the PWM input the LED brightness can be regulated via duty cycle. Also PWM = L sets
the TLE 4242 in sleep mode resulting in a very low current consumption of << 1

µA typ.

Due to the high impedance of the PWM input (see “PWM Pin Input Current versus

PWM Voltage” on Page 11) the PWM pin can thus also be used as an enable input.

Data Sheet 2 Rev. 1.0, 2004-01-01

TLE 4242 G

17

Q

Ι

PWMSTGND

REF

D

AEP01938_4242

Figure 2 Pin Configuration (top view)

Table 1 Pin Definitions and Functions
Pin No. Symbol Function

1IInput; block to GND directly at the IC with a 100 nF ceramic

capacitor.

2PWMPulse Width Modulation Input; if not needed connect to I
3STStatus Output; open collector output, connect to external

pull-up resistor (

R

pull-up

≥ 4.7 kΩ).

4GNDGround
5REFReference Input; connect to shunt resistor.
6DStatus Delay; connect to GND via an optional capacitor to

set status reaction delay. Leave open if no ST delay is
needed.

7QOutput

Data Sheet 3 Rev. 1.0, 2004-01-01

Application Information

TLE 4242 G

V

BAT

I

TLE 4269 G

GND DRADJ

100

nF

RO

SI

µC

Q

10

µF

10 kΩ

I

ST PWM

TLE 4242 G

GND D

47 nF

REF

Q

LED
Dragon

0.47 Ω

0.25 W

R

REF

AEA03499.VSD

Figure 3 Application Circuit

Figure 3 shows a typical application with the TLE 4242 G LED driver. The 3 LEDs are

driven with an adequate supply current adjusted by the resistor

R

. Thus brightness

REF

variations due to forward voltage spread of the LEDs are prevented. The luminosity
spread arising from the LED production process can be compensated via software by an
appropriate duty cycle applied to the PWM pin. Hence selection of the LEDs to forward
voltage as well as to luminosity classes can be spared. The minimum supply voltage
calculates as the sum of the LED forward voltages, the TLE 4242 G drop voltage (max.

0.7 V at a LED current of 300 mA) and the max. voltage drop at the shunt resistor

R

REF

of max. 185 mV.
The status output of the LED driver (ST) detects an open load condition enabling to

supervise correct LED function. A LED failure is detected if the voltage drop at the shunt
resistor

R

falls below typ. 25 mV. In this case the status output pin ST is set low after

REF

a delay time adjustable via an optional capacitor connected to the pin D.

Data Sheet 4 Rev. 1.0, 2004-01-01

TLE 4242 G

The functionality of the ST and PWM as well as their timings are shown in Figure 4. The
Status delay can be adjusted via the capacitor connected to the timing Pin D. The delay
time scales in linear way with the capacitance

C

:

D

t

STHL,typ

V

V

PWM, H

V

PWM, L

V

PWM

I

mA

256

------------- -­47 nF

I

Q

C

D

×= t

10 ms

STLH,typ

C

D

------------- --

47 nF

t

PWM, ON

10

µs×=

Open

Load

(2)

t

t

PWM, OFF

t

t

V

D

V

UD

V

LD

STHL

t

t

V

ST

V

STL

t

AET03505.VSD

Figure 4 Function and Timing Diagram

Data Sheet 5 Rev. 1.0, 2004-01-01

Table 2 Absolute Maximum Ratings

TLE 4242 G

-40

°C < T

< 150 °C

j

Parameter Symbol Limit Values Unit Remarks

Min. Max.

Input

Voltage
Current

V
I

I

I

-42 45 V –
––mA internally limited

Output

Voltage
Current

V
I

Q

Q

-1 40 V –
––mA internally limited

Status Output

Voltage
Current

V
I

ST

ST

-0.3 40 V –

-5 5 mA –

Status Delay

Voltage

V

D

-0.3 7 V –

Reference Input

Voltage V
Current

I

REF

REF

-1 16 V –

-2 2 mA –

Pulse Width Modulation Input

Voltage

V

PWM

-40 40 V –

Current – -1 1 mA –

Temperatures

Junction temperature
Storage temperature

T

j

T

stg

-40 150 °C –

-50 150 °C –

Thermal Resistances

Junction ambient

R

thja

– 78 K/W Footprint only
– 52 K/W 300mm2 heat sink area
– 39 K/W 600mm

Junction case

1) Worst case regarding peak temperature; mounted on PCB FR4, 80 × 80 × 1.5 mm3, 35 µm Cu.

R

thjc

– 3K/W–

2

heat sink area

1)

Note: Maximum ratings are absolute ratings; exceeding any one of these values may

cause irreversible damage to the integrated circuit.

Data Sheet 6 Rev. 1.0, 2004-01-01

Table 3 Operating Range
Parameter Symbol Limit Values Unit Remarks

Min. Max.

TLE 4242 G

Input voltage
Status output voltage
Status Delay

capacitance
PWM voltage
Junction temperature
Reference resistor

V
V
C

V
T
R

I

ST

D

PWM

j

REF

4.5 42 V –
– 16 V –

02.2µF –

040V–

-40 150 °C –

01.8Ω –

Data Sheet 7 Rev. 1.0, 2004-01-01

TLE 4242 G

Table 4 Electrical Characteristics

V

= 13.5 V; R

I

to ground; positive current defined flowing into pin; unless otherwise specified

Parameter Symbol Limit Values Unit Test Condition

= 0.47 Ω; V

REF

PWM

≥ V

; -40 °C < Tj < 150 °C; all voltages with respect

PWM,H

Min. Typ. Max.

Current consumption

I

off mode
Current consumption

I

Output

Output current I

Output current limit

I

Drop voltage V

PWM Input

PWM high level
PWM low level

V
V

qOFF

qL

Q

Qmax

dr

PWM,H

PWM,L

– 0.1 2 µAPWM = L,

T

< 85 °C

j

– 12 22 mA VQ = 6.6 V

357 376 395 mA VQ - V

V
R

- V

Q
REF

168 177 185 mA

431 454 476 mA VQ - V

R

REF

1)

= 6.6 V

REF

= 6.6 V;

REF

= 1.0 Ω

= 6.6 V;

REF

= 0.39 Ω

357 376 395 mA 5.4 V ≤ VQ - V

≤ V

9 V

– 600 – mA R

REF

≤ 16 V

I

= 0 Ω

– 0.35 0.7 V IQ = 300 mA

2.6 ––V –
––0.7 V –

≤ 7.8 V;

REF

PWM input current

I

PWM,H

– 220 500 µA V

PWM

= 5.0 V

high level
PWM input current

I

PWM,L

-1 – 1 µA V

PWM

= 0.0 V

low level
Turn on delay time

t

PWM,ON

01540µs 70% of I

Qnom

, see

Figure 4

Turn off delay time

t

PWM,OFF

01540µs 30% of I

Qnom

, see

Figure 4

Data Sheet 8 Rev. 1.0, 2004-01-01

TLE 4242 G

Table 4 Electrical Characteristics (cont’d)

V

= 13.5 V; R

I

to ground; positive current defined flowing into pin; unless otherwise specified

Parameter Symbol Limit Values Unit Test Condition

Reference

= 0.47 Ω; V

REF

PWM

≥ V

; -40 °C < Tj < 150 °C; all voltages with respect

PWM,H

Min. Typ. Max.

Reference Voltage
Reference Input

Current

Status Output

Lower status
switching threshold

Upper status
switching threshold

Status low voltage
Leakage current

Status Delay

Status reaction delay t
Status release delay

1) VQ - V

equals the forward voltage sum of the connected LEDs, see Figure 3.

REF

V

REF

I

REF

V

IQL

V

IQH

V

STL

I

STLK

STHL

t

STLH

168 177 185 mV 0.39 < R

-1 0.1 1 µA V

= 180 mV

REF

< 1.0 Ω

REF

15 25 – mV ST = L

– 30 40 mV ST = H

––0.4 V IST = 1.5 mA
––5 µA VST = 5.0 V

6 1014msCD = 47 nF, ST H → L
– 10 20 µs CD = 47 nF, ST L → H

Data Sheet 9 Rev. 1.0, 2004-01-01

Typical Performance Characteristics

TLE 4242 G

Output Current versus
External Resistor

600

mA

I

Q

500

400

300

200

100

0

0.2 0.5 1.0 2.0

0.39 0.47

AED03503.VSD

V

= 6.6 V

Q

Ω

R

REF

Reference Voltage versus
Junction Temperature

185

mV

V

REF

180

175

170

165

160

-40

04080 °C160

AED03506.VSD

T

j

Output Current versus
Supply Voltage

600

mA

I

Q

500

400

300

200

100

0

0

5 1015202530 V40

AED03504.VSD

V

= 6.6 V

Q

R

= 0.47 Ω

REF

V

I

Data Sheet 10 Rev. 1.0, 2004-01-01

TLE 4242 G

PWM Pin Input Current versus
PWM Voltage

AED03502.VSD

I

PWM

2.0

mA

1.5

1.0

0.5

0

0

5 1015202530 V40

V

PWM

PWM Pin Input Current versus
PWM Voltage

AED03501.VSD

I

PWM

400

µA

300

200

100

0

0 1 2 3 4 5 6 7 8

V

V

PWM

Data Sheet 11 Rev. 1.0, 2004-01-01

Package Outlines

(15)

7x0.6

1

±0.2

9.25 ±0.3

±0.1

10

9.8

±0.2

±0.15

8.5

1)

A

1)

8

0...0.15

6x1.27

TLE 4242 G

4.4

±0.1

1.27
B

0.1

2.4

±0.3

±0.5

2.7

4.7

0.5

8˚ max.

M

BA0.25

0.05

±0.1

0.1

1)

Typical
All metal surfaces tin plated, except area of cut.

Figure 5 P-TO263-7-1 (Plastic Transistor Single Outline)

GPT09114

You can find all of our packages, sorts of packing and others in our
Infineon Internet Page “Products”: http://www.infineon.com/products.

SMD = Surface Mounted Device

Dimensions in mm

Data Sheet 12 Rev. 1.0, 2004-01-01

Edition 2004-01-01
Published by Infineon Technologies AG,

St.-Martin-Strasse 53,
81669 München, Germany

© Infineon Technologies AG 2004.

All Rights Reserved.

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