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PDF TLE4309 Data sheet ( Hoja de datos )
| Número de pieza | TLE4309 | |
| Descripción | Adjustable Linear Low Dropout LED Driver | |
| Fabricantes | Infineon Technologies | |
| Logotipo |  |
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Adjustable Linear Low Dropout LED Driver
TLE4309
Features
• Adjustable constant current up to 500 mA
• Operating supply voltage range 4.5 V to 24 V
• Maximum supply voltage up to 45 V
• Low dropout voltage
• PWM / ENABLE input
• << 1 µA quiescent current when disabled
• Overtemperature protection
• Short circuit proof
• Reverse polarity protection
• Operating junction temperature range: -40 °C to 150 °C
• Suitable for applications up to 85 °C ambient temperature.
• Green Product (RoHS compliant)
PG-TO263-7
Functional Description
The TLE4309 is an integrated adjustable constant current source for driving loads up to
500 mA. The output current level can be adjusted with an external shunt resistor.
Supplying high power LEDs with the TLE4309 ensures constant brightness independent
from supply voltage or LED forward voltage spread. Therefore, LED lifetime is extended
by protecting from overcurrent and overtemperature
The PWM/EN input permits LED brightness regulation by pulse width modulation.
Setting the pin to “low” switches off the IC entirely. Due to the high impedance of the
PWM/EN input, the TLE4309 can be used as a protected high side switch.
Protection circuits prevent from damage to the IC in case of overload, short circuit, and
reverse polarity. A chip temperature monitoring circuit shuts off the power stage and
prevents the IC from destruction under fault conditions.
In case of negative input voltage, a leakage current is flowing only from the output to the
input, hence the LED are protected against reverse supply. Input voltage peaks up to
45 V are absorbed by the IC, preventing the LEDs from overcurrent.
www.DTahtaeShTeeLt4EU4.c3om09G is provided in the surface mounted PG-TO-263 package with excellent
thermal resistance.
Type
TLE4309G
Datasheet
Package
PG-TO263-7-1
1
Marking
TLE4309
Rev. 1.0, 2007-03-20
1 page  
TLE4309
Table 3
Operating Range
Parameter
Symbol Limit Values Unit Remarks
Min. Max.
Input voltage
VI
4.5 24
V–
PWM / ENABLE voltage VPWM
0
24 V –
Junction temperature Tj
-40 150 °C –
Reference resistor
RREF
0
1.8 Ω –
Note: Within the functional range the IC operates as described in the circuit description.
The electrical characteristics are specified within the conditions given in the
related electrical characteristics table
.
Table 4
Thermal Resistance
Parameter
Junction ambient
Symbol
Rthja
Typical
Unit
Limit Values
78 K/W
52 K/W
39 K/W
Remarks
Footprint only1)
300mm2 heat sink area1)
600mm2 heat sink area1)
Junction case
Rthjc
3
K/W –
1) Worst case regarding peak temperature; mounted on PCB FR4, 80 × 80 × 1.5 mm3, 35 µm Cu,
horizontal position, zero airflow.
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Datasheet
5
Rev. 1.0, 2007-03-20
5 Page 
TLE4309
Revision History
Version
Rev. 1.0
Date
Changes
2007-03-20 Final Datasheet and initial version of RoHS-compliant
derivate of TLE4309G
Page 1 and Page 8: RoHS compliance statement and green
product feature added
Page 1 and Page 8: Package changed to RoHS compliant
version
Legal Disclaimer updated
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Datasheet
11 Rev. 1.0, 2007-03-20
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet TLE4309.PDF ] | |
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