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Adjustable LED Driver
TLE 4242 G
Features * * * * * * * * Adjustable constant current up to 500 mA (5%) 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 C to 150 C
P-TO263-7-1
Functional Description 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 TLE 4242 G
Data Sheet
Ordering Code Q67006-A9674
1
Package P-TO263-7-1
Rev. 1.0, 2004-01-01
TLE 4242 G
Circuit Description
I
1 Bias Supply
7
Q
PWM
2
Bandgap Reference Comparator
5
REF
3 Status Delay
ST
4 GND D
6
AEB03500.VSD
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 REF I Q, typ = -----------R REF
(1)
where VREF is the reference voltage with a typical level of 177 mV (see Page 10). The equation applies in a range of 0.39 RREF 1.8 . 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 A 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
1
7
ST
REF D
Q
PWM GND
AEP01938_4242
Figure 2 Table 1 Pin No. 1 2 3 4 5 6 I
Pin Configuration (top view) Pin Definitions and Functions Symbol Function Input; block to GND directly at the IC with a 100 nF ceramic capacitor. Pulse Width Modulation Input; if not needed connect to I Status Output; open collector output, connect to external pull-up resistor (Rpull-up 4.7 k). Ground Reference Input; connect to shunt resistor. Status Delay; connect to GND via an optional capacitor to set status reaction delay. Leave open if no ST delay is needed. Output
PWM ST GND REF D
7
Q
Data Sheet
3
Rev. 1.0, 2004-01-01
TLE 4242 G
Application Information
VBAT
I
TLE 4269 G
RO SI Q C
RADJ
GND 100 nF
D 10 F 10 k
ST
PWM Q
I
TLE 4242 G
REF GND 47 nF D
LED Dragon
0.47 0.25 W
RREF
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 RREF. Thus brightness 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 RREF 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 RREF falls below typ. 25 mV. In this case the status output pin ST is set low after 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 CD:
CD t STHL,typ = -------------- x 10 ms
47 nF
CD t STLH,typ = -------------- x 10 s
47 nF
(2)
VI
Open Load
VPWM VPWM, H VPWM, L IQ
mA 256
t
tPWM, ON
tPWM, OFF
t
VD
tSTHL
t
VUD VLD VST
t
VSTL
t
AET03505.VSD
Figure 4
Function and Timing Diagram
Data Sheet
5
Rev. 1.0, 2004-01-01
TLE 4242 G
Table 2
Absolute Maximum Ratings
-40 C < Tj < 150 C Parameter Input Voltage Current Output Voltage Current Status Output Voltage Current Status Delay Voltage Reference Input Voltage Current Voltage Current Temperatures Junction temperature Storage temperature Thermal Resistances Junction ambient Symbol Limit Values Min. Max. 45 - 40 - 40 5 7 16 2 40 1 150 150 78 52 39 3 V mA V mA V mA V V mA V mA - internally limited - internally limited - - - - - - - - - Footprint only1) 300mm2 heat sink area 600mm2 heat sink area - Unit Remarks
VI II VQ IQ VST IST VD VREF IREF VPWM
-
-42 - -1 - -0.3 -5 -0.3 -1 -2 -40 -1 -40 -50 - - -
Pulse Width Modulation Input
Tj Tstg Rthja
C C
K/W K/W K/W K/W
Junction case
Rthjc
-
1) Worst case regarding peak temperature; mounted on PCB FR4, 80 x 80 x 1.5 mm3, 35 m Cu.
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
TLE 4242 G
Table 3 Parameter Input voltage
Operating Range Symbol Limit Values Min. Max. 42 16 2.2 40 150 1.8 V V - - - - - - 4.5 - 0 0 -40 0 Unit Remarks
Status output voltage Status Delay capacitance PWM voltage Junction temperature Reference resistor
VI VST CD VPWM Tj RREF
F
V
C
Data Sheet
7
Rev. 1.0, 2004-01-01
TLE 4242 G
Table 4
Electrical Characteristics
VI = 13.5 V; RREF = 0.47 ; VPWM VPWM,H; -40 C < Tj < 150 C; all voltages with respect
to ground; positive current defined flowing into pin; unless otherwise specified Parameter Symbol - - 357 168 431 357 Output current limit Drop voltage PWM Input PWM high level PWM low level PWM input current high level PWM input current low level Turn on delay time Turn off delay time Limit Values Min. Current consumption IqOFF off mode Current consumption IqL Output Output current Typ. 0.1 12 376 177 454 376 600 0.35 - - 220 - 15 15 Max. 2 22 395 185 476 395 - 0.7 - 0.7 500 1 40 40 Unit Test Condition
A
mA mA mA mA mA mA V V V
PWM = L, Tj < 85 C
VQ = 6.6 V VQ - VREF1) = 6.6 V VQ - VREF = 6.6 V; RREF = 1.0 VQ - VREF = 6.6 V; RREF = 0.39 5.4 V VQ - VREF 7.8 V; 9 V VI 16 V RREF = 0 IQ = 300 mA
- -
IQ
IQmax Vdr VPWM,H VPWM,L IPWM,H IPWM,L tPWM,ON
- - 2.6 - - -1 0
A A s s
VPWM = 5.0 V VPWM = 0.0 V
70% of IQnom, see Figure 4 30% of IQnom, see Figure 4
tPWM,OFF 0
Data Sheet
8
Rev. 1.0, 2004-01-01
TLE 4242 G
Table 4
Electrical Characteristics (cont'd)
VI = 13.5 V; RREF = 0.47 ; VPWM VPWM,H; -40 C < Tj < 150 C; all voltages with respect
to ground; positive current defined flowing into pin; unless otherwise specified Parameter Reference 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 tSTHL Status release delay tSTLH 6 - 10 10 14 20 ms Symbol Limit Values Min. Typ. 177 0.1 Max. 185 1 mV 0.39 < RREF < 1.0 Unit Test Condition
VREF IREF
168 -1
A
VREF = 180 mV
VIQL VIQH VSTL ISTLK
15 - - -
25 30 - -
- 40 0.4 5
mV mV V
ST = L ST = H
A
IST = 1.5 mA VST = 5.0 V CD = 47 nF, ST H L CD = 47 nF, ST L H
s
1) VQ - VREF equals the forward voltage sum of the connected LEDs, see Figure 3.
Data Sheet
9
Rev. 1.0, 2004-01-01
TLE 4242 G
Typical Performance Characteristics Output Current versus External Resistor
600 mA 500 0.39 0.47
AED03503.VSD
Reference Voltage versus Junction Temperature
VQ = 6.6 V
VREF
185 mV 180
AED03506.VSD
IQ
400
175
300
170
200
165
100
0 0.2
0.5
1.0
2.0 RREF
160 -40
0
40
80
C
160
Tj
Output Current versus Supply Voltage
IQ
600 mA 500
AED03504.VSD
VQ = 6.6 V RREF = 0.47
400
300
200
100
0
0
5
10 15 20 25 30
V 40
VI
Data Sheet
10
Rev. 1.0, 2004-01-01
TLE 4242 G
PWM Pin Input Current versus PWM Voltage
IPWM
2.0 mA
AED03502.VSD
PWM Pin Input Current versus PWM Voltage
IPWM
400 A
AED03501.VSD
1.5
300
1.0
200
0.5
100
0
0
5
10 15 20 25 30
V 40
0
0
1
2
3
4
5
6
7 V8
VPWM
VPWM
Data Sheet
11
Rev. 1.0, 2004-01-01
TLE 4242 G
Package Outlines
10 0.2 9.8 0.15 A
10.3
4.4 1.27 0.1 B 0.1 2.4
2.7 0.3
8.5 1)
0.05
9.25 0.2
(15)
8 1)
0...0.15 7x0.60.1 6x1.27
0.5 0.1
4.7 0.5
8 max.
0.25
1) M
AB
0.1
Typical All metal surfaces tin plated, except area of cut.
GPT09114
Figure 5
P-TO263-7-1 (Plastic Transistor Single Outline)
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 Data Sheet 12 Dimensions in mm Rev. 1.0, 2004-01-01
Edition 2004-01-01 Published by Infineon Technologies AG, St.-Martin-Strasse 53, 81669 Munchen, Germany
(c) Infineon Technologies AG 2004.
All Rights Reserved. Attention please! The information herein is given to describe certain components and shall not be considered as a guarantee of characteristics. Terms of delivery and rights to technical change reserved. We hereby disclaim any and all warranties, including but not limited to warranties of non-infringement, regarding circuits, descriptions and charts stated herein. Information For further information on technology, delivery terms and conditions and prices please contact your nearest Infineon Technologies Office (www.infineon.com). Warnings Due to technical requirements components may contain dangerous substances. For information on the types in question please contact your nearest Infineon Technologies Office. Infineon Technologies Components may only be used in life-support devices or systems with the express written approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system, or to affect the safety or effectiveness of that device or system. Life support devices or systems are intended to be implanted in the human body, or to support and/or maintain and sustain and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may be endangered.

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