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LED Driver with Adjustable Current
TLE 4241 GM
Features * * * * * * * * * Adjustable constant output current Wide input voltage range Low drop voltage Open load detection Overtemperature protection Short circuit proof Reverse polarity proof Wide temperature range: -40 C < Tj < 150 C Very small SMD-Package
P-DSO-8-3, -6, -7, -8, -9
Functional Description The TLE 4241 GM is an integrated adjustable constant current source. It provides an output current adjustable via different means (SET, PWM, reference resistor) which is kept nearly independent from load and supply voltage changes. The IC is designed to supply LEDs under the severe conditions of automotive applications resulting in constant brightness and extended LED lifetime. It is provided in the very small P-DSO-8-9 (Micro 8) package. Protection circuits prevent damage to the device in case of overload, short circuit, reverse polarity and overtemperature. The connected LEDs are protected against reverse polarity as well as excess voltages up to 45 V. A status output allows handling of open load and short circuit at the main output. A PWM input offers the possibility to adjust the LED brightness by pulse width modulation. With an implemented high/low current switch the output current level can be reduced e.g. for brake/tail light application. The implemented features such as adjustable output current, the high/low current switch and the provided PWM input make the device well suited for a broad range of LED and other applications.
Type TLE 4241 GM
Data Sheet
Ordering Code Q67006-A9644
1
Package P-DSO-8-9
Rev. 1.2, 2004-04-13
TLE 4241 GM
Circuit Description
I
Q
ST
Status
Regulation High
Regulation Low
Control
PWM
SET Reference Voltage
V/I Converter
REF
GND
AEB03003
Figure 1
Block Diagram
An internal reference voltage of typ. 1.20 V supplies the REF pin which is connected to GND via an external resistor. In the SET = H mode the reference current flowing on the REF pin is mirrored with an amplification to form the desired output current. The typ. output current in the SET = H mode calculates: 1.20 I Q, typ /mA = ---------------------- x 487 + 0.1 R REF /k
(1)
The output current is shown as a function of the reference resistance on Page 10 for the high as well as for the low current mode. With the PWM input the LED brightness can be regulated via duty cycle. Also PWM = L sets the TLE 4241 in sleep mode resulting in a very low current consumption of << 1 A typ. Due to the high impedance of the PWM input (see timing diagram IPWM versus VPWM on Page 12) the PWM pin can thus also be used as an Enable input.
Data Sheet
2
Rev. 1.2, 2004-04-13
TLE 4241 GM
GND ST PWM SET
1 2 3 4
8 7 6 5
I
Q REF GND
AEP03002
Figure 2 Table 1 Pin No. 1 2 3 4 5 6 7 8
Pin Configuration (top view) Pin Definitions and Functions Symbol GND ST PWM SET GND REF Q I Function Ground; internally connected to pin 5 Status Output; open collector output, connect to external pull-up resistor (10 k or higher) Pulse Width Modulation Input; if not needed connect to VI High/Low Current Input; choice of current level Ground; internally connected to pin 1 Reference Input; connect to GND via an external resistor to adjust the output current Output Input; block to GND directly at the IC with a 100 nF ceramic capacitor
Data Sheet
3
Rev. 1.2, 2004-04-13
TLE 4241 GM
Application Information
W RO TLE 4271 100 nF 22 F 10 k WD R C
VBatt
VQ
ST PWM SET TLE 4241G
I
Q
R REF
LA E67B OSRAM
AED03098
Figure 3
Application Circuit
Figure 3 shows a typical application with the TLE 4241 GM 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 slightly negative temperature coefficient of the TLE 4241 GM output current protects the LEDs against overtemperature stress if the IC is placed nearby the LEDs. The voltage drop (VI - VQ) across the TLE 4241 GM is monitored in order to detect an open load condition indicated at the status output pin ST. In case of open load, the voltage drop will decrease below the lower status switching threshold Vdr,L. Hence, the status output ST will be driven low. In normal operation, the voltage drop is above the upper status threshold Vdr,H, thus the open collector output ST is in high-ohmic state (see also section Status Output at the Electrical Characteristics). The function of ST, SET and PWM as well as their timings are shown in Figure 4.
Data Sheet
4
Rev. 1.2, 2004-04-13
TLE 4241 GM
VI
VPWM VPWM, H VPWM, L VSET VSET, H VSET, L
t
t
tSET, L
IQ
mA 47 10
tPWM, OFF tPWM, ON
t
tSET, H
VSTL
Open Load
VST
t
t
AET03339.VSD
Figure 4
Function and Timing Diagram
Data Sheet
5
Rev. 1.2, 2004-04-13
TLE 4241 GM
Table 2
Absolute Maximum Ratings
-40 C < Tj < 150 C Parameter Input Voltage Current Output Voltage Current Status Output Voltage Current Reference Input Voltage Current Voltage Current High/Low Current Input Voltage Current Temperatures Junction temperature Storage temperature Thermal Resistances Junction ambient Symbol Limit Values Min. Max. 45 - 40 - 40 5 7 2 40 1 40 1 150 150 105 V mA V mA V mA V mA V mA V mA C C K/W
3
Unit
Remarks
VI II VQ IQ VST IST VREF IREF VPWM
-
-42 - -1 - -0.3 -5 -0.3 -2 -40 -1 -40 -1 -40 -50 -
- internally limited - internally limited - internally limited - - - - - - - -
1)
Pulse Width Modulation Input
VSET ISET Tj Tstg Rthja
1) Worst case regarding peak temperature; mounted on PCB 80 x 80 x 1.5 mm , 35 m Cu, 300 mm2 heat sink area.
Note: Maximum ratings are absolute ratings; exceeding any one of these values may cause irreversible damage to the integrated circuit.
Data Sheet
6
Rev. 1.2, 2004-04-13
TLE 4241 GM
Table 3 Parameter Input voltage
Operating Range Symbol Limit Values Min. Max. 45 16 40 40 150 100 18 V V V V C k k - - - - - SET = H SET = L 4 - 0 0 -40 7 4.7 Unit Remarks
Status output voltage SET voltage PWM voltage Junction temperature Reference Resistor
VI VST VSET VPWM Tj RREF
Data Sheet
7
Rev. 1.2, 2004-04-13
TLE 4241 GM
Table 4
Electrical Characteristics
9 V VI 16 V; RREF = 10 k; VPWM VPWM,H; -40 C < Tj < 150 C; all voltages with respect to ground; positive current defined flowing into pin; unless otherwise specified Parameter Current consumption off mode Current consumption Current consumption Current consumption open load Current consumption open load Output Output current Output current Current Ratio Output current limit Output current limit Drop voltage Drop voltage PWM Input PWM high level PWM low level PWM input current high level PWM input current low level Turn on delay time Symbol Limit Values Min. Typ. 0.1 5 6 - - Max. 2 10 10 10 10 A mA mA mA mA PWM = L, TJ < 85 C; VI 13.5 V SET = L; VQ = 6 V SET = H; VQ = 6 V SET = L; VQ open SET = H; VQ open - - - - - Unit Test Condition
IqOFF IqL IqH IqL,O IqH,O
IQ IQ IQH/IQL IQmax IQmax Vdr Vdr
6.7 - 47 - 6 - - - -
8.4 8.6 58.5 60.0 7 83 83 0.2 0.3
10 - 70 - 8 - - 0.5 0.5
mA mA mA mA - mA mA V V
SET = L, VQ = 6 V SET = L, VQ = 4 V SET = H, VQ = 6 V SET = H, VQ = 4 V - SET = L; RREF = 0 SET = H; RREF = 0 SET = L;
IQ = 80% of IQ,nom,L
SET = H;
IQ = 80% of IQ,nom,H VPWM,H VPWM,L IPWM,H IPWM,L tPWM,ON
2.0 - - -10 0 - - 220 - 5 - 0.5 500 10 30 V V A A s - -
VPWM = 5.0 V VPWM = 0.0 V
20%/80% IQ, see Figure 4
Data Sheet
8
Rev. 1.2, 2004-04-13
TLE 4241 GM
Table 4
Electrical Characteristics (cont'd)
9 V VI 16 V; RREF = 10 k; VPWM VPWM,H; -40 C < Tj < 150 C; all voltages with respect to ground; positive current defined flowing into pin; unless otherwise specified Parameter Turn off delay time SET Input SET high level SET low level SET input current high level SET input current low level Delay time L -> H Delay time H -> L Status Output Lower status switching threshold Symbol Limit Values Min. Typ. 10 Max. 30 s 20%/80% IQ, see Figure 4 - - Unit Test Condition
tPWM,OFF 0
VSET,H VSET,L ISET,H ISET,L tSET,H tSET,L
2.0 - - -10 - -
- - 220 - - -
- 0.5 500 10 30 30
V V A A s s
VSET = 5.0 V VSET = 0.0 V
20%/80% IQ, see Figure 4 20%/80% IQ, see Figure 4 (VI - VQ) decreasing SET = L (VI - VQ) decreasing SET = H (VI - VQ) increasing SET = L (VI - VQ) increasing SET = H (VI - VQ) < Vdr,L IST = 1.0 mA (VI - VQ) > Vdr,H VST = 5.0 V
Vdr,L
0.15 0.15
- - - - - -
- - 0.7 0.7 0.4 10
V V V V V A
Upper status switching threshold
Vdr,H
- -
Status low voltage Leakage current
VSTL ISTLK
- -
Data Sheet
9
Rev. 1.2, 2004-04-13
TLE 4241 GM
Typical Performance Characteristics Output Current versus External Resistor, SET = H
100
AED03333.VSD
Output Current versus External Resistor, SET = L
20
AED03334.VSD
IQ mA
80 70 60 50 40 30 20 10 0 5 10 20
SET = H VQ = 6 V
IQ mA
16 14 12 10 8 6 4 2
VQ = 6 V
SET = L
50 k 100
0
5
10
20
50 k 100
RREF
RREF
Output Current versus Supply Voltage, SET = H
100
AED03335.VSD
Output Current versus Supply Voltage, SET = L
20
AED03336.VSD
IQ mA
80 70 60 50 40 30 20 10 0 0 5
VQ = 6 V RREF = 10 k
SET = H
IQ mA
16 14 12 10 8 6 4 2
VQ = 6 V RREF = 10 k
SET = L
10 15 20 25 30
V 40
0
0
5
10 15 20 25 30
V 40
VI
VI
Data Sheet
10
Rev. 1.2, 2004-04-13
TLE 4241 GM
Reference Voltage versus Junction Temperature
1.25
AED03340.VSD
VREF
V
RREF = 10 k
1.23
1.21
1.19
1.17
1.15 -40
0
40
80
C
160
Tj
Data Sheet
11
Rev. 1.2, 2004-04-13
TLE 4241 GM
PWM Pin Input Current versus PWM Voltage
2.0 mA
AED03332.VSD
PWM Pin Input Current versus PWM Voltage
400 A
AED03331.VSD
IPWM
IPWM
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
V8
VPWM
VPWM
SET Pin Input Current versus SET Voltage
2.5
AED03338.VSD
SET Pin Input Current versus SET Voltage
400 A
AED03337.VSD
ISET mA
2.0
ISET
300
1.5
200
1.0
100
0.5
0
0
5
10 15 20 25 30
V 40
0
0
1
2
3
4
5
6
V8
VSET
VSET
Data Sheet
12
Rev. 1.2, 2004-04-13
TLE 4241 GM
Package Outlines
0.33 0.08 x 45
1.75 MAX. 0.1 MIN. (1.5)
4 -0.21)
1.27 0.41 +0.1 -0.05 8 5
0.1
C
6 0.2
0.64 0.25
0.2 M A C x8
Index Marking 1
4
5 -0.21)
1)
A
Index Marking (Chamfer) Does not include plastic or metal protrusion of 0.15 max. per side
8 MAX.
0.2
+0.05 -0.01
GPS09032
Figure 5
P-DSO-8-9 (Plastic Dual Small 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 13 Dimensions in mm Rev. 1.2, 2004-04-13
TLE 4241 GM
Revision History
Version Date
Changes
Rev. 1.2 2004-04-13 Page 4, 9: Improved indication and explanation of the open load detection function.
Data Sheet
14
Rev. 1.2, 2004-04-13
Edition 2004-04-13 Published by Infineon Technologies AG, St.-Martin-Strasse 53, 81669 Munchen, Germany
(c) Infineon Technologies AG 2004. All Rights Reserved.
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