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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 A 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. The TLE4309G 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
TLE4309
Circuit Description An external shunt resistor in the ground path of the connected LEDs senses the LED current. A regulation loop maintains the voltage drop across the shunt resistor at a constant level. Selecting the shunt resistance permits to adjust the appropriate constant current . The output current calculates
V REF I Q, typ = -----------R REF
(1)
where VREF is the reference voltage. (see "Electrical Characteristics" table). The equation applies in a range of 0.39 RREF 1.8 . On Page 7, the output current is shown as a function of the reference resistance.
TLE 4309
I PWM / EN optional 1 7 Q
100nF
2
Bias Supply
Temp. Shutdown
+12V
Bandgap Reference 5 4 GND
T L E 4 3 0 9 _ B L OCK DI A GRA M+ A P P CI RCUIT .V S D
Logic REF
RRE F
Figure 1
Block Diagram and Typical Application Circuit
During operation, the LED brightness is modifiable by adjusting the duty cycle at the PWM/EN input. This allows to dim the LEDs during operation or adapt the output current to different LED luminosity classes. A low signal at the PWM/EN input sets the IC into sleep mode consuming less than 1 A. Due to its high input impedance, the PWM/EN pin can be used as an enable input. Connect the pin directly to the supply line, if its function is not needed. The minimum supply voltage calculates as the sum of the LED forward voltages, the TLE4309 dropout voltage and the maximum voltage drop across the reference resistor RREF .
Datasheet
2
Rev. 1.0, 2007-03-20
TLE4309
TAB
1
7
I n.c REF Q PWM GND n.c. / EN
Figure 2
Pin Configuration (top view)
Table 1 1 2 3 4 5 6 7 TAB I
Pin Definitions and Functions Input. Pulse Width Modulation Input / ENABLE input. If not needed connect to I (pin 1). Internally not connected. Leave open. Ground reference; connect to heatsink area and to TAB. Reference Input; connect to shunt resistor. Internally not connected. Leave open. Output. Connect to heatsink area and to GND pin.
Pin No. Symbol Function PWM / EN n. c. GND REF n. c. Q
Datasheet
3
T E4 3 9 PI O UT L 0_ N .VSD
P-TO-263
Rev. 1.0, 2007-03-20
TLE4309
Table 2 Parameter Input Voltage Current Output Voltage Current
Absolute Maximum Ratings Symbol Limit Values Min. Max. 45 - 40 - 16 2 40 1 150 150 2 V mA V mA V mA V mA C C kV - internally limited - internally limited - - - - - - Human Body Model1) Unit Remarks
VI II VQ IQ VREF IREF VPWM IPWM Tj Tstg
-42 - -1 - -1 -2 -40 -1 -40 -50
Reference Input Voltage Current Voltage Current Temperatures Junction temperature Storage temperature ESD Susceptibility ESD Resistivity
Pulse Width Modulation / Enable Input
VESD,HBM -2
1) ESD susceptibility, HBM according to EIA/JESD 22-A114B
Note: Stresses above the ones listed here may cause permanent damage to the device. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Note: Integrated protection functions are designed to prevent IC destruction under fault conditions described in the data sheet. Fault conditions are considered as "outside" normal operating range. Protection functions are not designed for continuous repetitive operation.
Datasheet
4
Rev. 1.0, 2007-03-20
TLE4309
Table 3 Parameter Input voltage
Operating Range Symbol Limit Values Min. Max. 24 24 150 1.8 V V C - - - - 4.5 0 -40 0 Unit Remarks
VI PWM / ENABLE voltage VPWM Tj Junction temperature Reference resistor RREF
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 Parameter Junction ambient Thermal Resistance Symbol Typical Unit Limit Values 78 52 39 Junction case K/W K/W K/W K/W Remarks Footprint only1) 300mm2 heat sink area1) 600mm2 heat sink area1) -
Rthja
Rthjc
3
1) Worst case regarding peak temperature; mounted on PCB FR4, 80 x 80 x 1.5 mm3, 35 m Cu, horizontal position, zero airflow.
Datasheet
5
Rev. 1.0, 2007-03-20
TLE4309
Table 5
Electrical Characteristics
VI = 13.5 V; VPWM VPWM,H; -25 C < Tj < 125 C;
all voltages with respect to ground; unless otherwise specified Parameter Output Output current Symbol Limit Values Min. Typ. 178 456 600 0.35 178 178 0.1 Max. 185 474 - 0.7 184 185 1 mA mA mA V mV mV A (VQ-VREF)1) = 6.6 V; RREF = 1.0 (VQ-VREF)1) = 6.6 V; RREF = 0.39 Unit Test Condition
IQ
171 438
Output current limit Dropout voltage Reference Reference Voltage Reference Voltage Reference Input Current
IQmax Vdr VREF VREF IREF
- - 172 171 -1
RREF = 0 IQ = 300 mA
0.39 < RREF < 1.0 Tj = 25 C 0.39 < RREF < 1.0
VREF = 180 mV
Current Consumption Current consumption Iq,OFF off mode Current consumption Iq PWM / ENABLE PWM high level valid VPWM,H PWM low level valid PWM input current high level PWM input current low level Turn on delay time Turn off delay time 2.6 - - -1 - - 220 - 15 15 - 0.7 500 1 40 40 V V A A s s - - - - 0.1 12 2 22 A mA PWM/EN = L, Tj < 85 C
VQ = 6.6 V; RREF = 0.47
VPWM,L IPWM,H IPWM,L
VPWM = 5.0 V VPWM = 0.0 V
70% of IQnom 30% of IQnom
tPWM,ON 0 tPWM,OFF 0
1) (VQ - VREF) equals the forward voltage sum of the connected LEDs, see figure 1.
Datasheet
6
Rev. 1.0, 2007-03-20
TLE4309
Typical Performance Characteristics Output Current versus Reference Resistor
600 mA 500 0.39 0.47
A E D03503.V S D
Reference Voltage versus Junction Temperature
VQ = 6.6 V
VREF
185 mV 180
AED03506.VSD
IQ
400
175
300
170
200
100
165
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
PWM/EN Pin Input Current versus Voltage applied
1.0 I P WM
AED03505.VSD
VQ = 6.6 V RREF = 0.47
mA
400
300
0.5
200
100
0
0
5
10 15 20 25 30
V 40
0
0
5
10 15 20 25 30
V 40 VP WM
VI
Datasheet
7
Rev. 1.0, 2007-03-20
TLE4309
Package Outline
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
8 max.
0.5 0.1
0.25
1)
M
AB
4.7 0.5
0.1
Typical All metal surfaces tin plated, except area of cut.
GPT09114
Figure 3
PG-TO263-7-1
Green Product (RoHS compliant) To meet the world-wide customer requirements for environmentally friendly products and to be compliant with government regulations the device is available as a green product. Green products are RoHS-Compliant (i.e Pb-free finish on leads and suitable for Pb-free soldering according to IPC/JEDEC J-STD-020).
find all packages, sorts of packing and others on the Infineon Internet Page "Packages": http://www.infineon.com/packages. SMD = Surface Mounted Device Datasheet 8 Dimensions in mm Rev. 1.0, 2007-03-20
TLE4309
Application Note: Thermal Considerations 1) By describing an example, this section shows how the power dissipation and the needed thermal resistance can be estimated. For a typical application circuit as shown in Figure 1, the following parameters shall apply: * * * * * * * Number of LEDs in series: 3 LED current desired: IF = 260 mA LED minimum forward voltage: VF,MIN = 3.0 V LED maximum forward voltage: VF,MAX = 3.4 V Supply minimum DC voltage: VI,MIN = 11.0 V Supply maximum DC voltage: VI,MAX = 13.0 V Maximum ambient temperature: Ta,max = 85 C
1. Selecting the reference resistor: The reference resistor RREF can be selected by using the formular on page 2 or by taking the value from the typical performance graph "Output Current versus Reference Resistor" on Page 7. In order to obtain a LED forward current of IF = 260 mA, the graph shows an reference resistor of RREF = 0.68 . 2. Verifying the minimum supply voltage: In order to be able to drive the LEDs with a constant current, the minimum supply voltage needed is:
VI,MIN = VF,MAX,total + Vdr + VREF whereas VF,MAX,total is the maximum forward voltage sum of the LEDs connected in series, Vdr the dropout voltage and VREF the reference voltage.
Since the power dissipation is low at a small voltage drop accross the regulator, Vdr = 0.35 V is assumed. The maximum reference voltags is VREF = 185mV. Therefore, a minimum supply voltage of 11 V is sufficient for the example given above. 3. Determining the minimum and maximum LED forward current: The TLE4309 has an accuracy of < 4 %. With a reference resistor of RREF = 0.68 , the output current IQ will be between 251 mA and 272 mA.
1) This information is given as a hint for the implementation of the device only and shall not be regarded as a description or warranty of a certain functionality, condition or quality of the device.
Datasheet
9
Rev. 1.0, 2007-03-20
TLE4309
4. Calculating the maximum power dissipation: For calculating the maximum power dissipation, the minimum forward voltage sum of the LEDs connected in series VF,MIN,total (= No. of LEDs * VF,MIN) , the maximum supply voltage VI,MAX , the IC current consumption Iq,MAX , as well as the the maximum output current IQ,MAX needs to be considered. Hence, the maximum power dissipation PD,MAX calculates:
PD,MAX = (VI,MAX - VF,MIN,total) * IQ,MAX + VI,MAX * Iq,MAX
With assuming a maximum current consumption of 15 mA @ IQ = 260 mA, the maximum power dissipation for the example is 1.28 W. 5. Thermal Resistance needed: The thermal resistance from junction to ambient Rth,j-a calculates:
Rth,j-a = (Tj,max - Ta,max) / PD,MAX
With allowing a junction temperature of 150 C, the Rth,j-a needed in our example would be 50 K/W. In case some copper area on the PCB is used as a heat sink, the area needed is approximately 6 cm2 (board in horizontal position, no airflow). If the area is not available, several via holes to the GND-layer or to a heatsink area on the PCB backside help to distribute the heat. For additional information on the thermal resistance see Infineon' s special subject book "Thermal Resistance - Theory and Practice" including extended package information.
Datasheet
10
Rev. 1.0, 2007-03-20
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
Datasheet
11
Rev. 1.0, 2007-03-20
Edition 2007-03-20 Published by Infineon Technologies AG 81726 Munich, Germany
(c) 2007 Infineon Technologies AG
All Rights Reserved. Legal Disclaimer The information given in this document shall in no event be regarded as a guarantee of conditions or characteristics. With respect to any examples or hints given herein, any typical values stated herein and/or any information regarding the application of the device, Infineon Technologies hereby disclaims any and all warranties and liabilities of any kind, including without limitation, warranties of non-infringement of intellectual property rights of any third party. Information For further information on technology, delivery terms and conditions and prices, please contact the 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 the nearest Infineon Technologies Office. Infineon Technologies components may be used in life-support devices or systems only 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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