TLD5045EJ Data Sheet

Infineon® LITIX™ Power
700mA High Integration - DC/DC Step-Down Converter
TLD5045EJ
Infineon® LITIX™ Power
700mA High Integration - DC/DC Step-Down Converter
Data Sheet
Revision 1.0
2015-05-28
Automotive Power
Infineon® LITIX™ Power
TLD5045EJ
Table of Contents
Table of Contents
Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
3.1
3.2
Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin Assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin Definitions and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4
4.1
4.2
4.3
General Product Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Functional Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Thermal Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5
5.1
5.2
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
General Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Power Supply Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6
6.1
6.2
6.2.1
6.2.2
6.3
Enable, Dimming Function and Thermal Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Electrical Characteristics Enable, Bias, Dimming Function and Thermal Protection . . . . . . . . . . . . . 14
PWM Dimming with µC connected to TLD5045EJ PWMI pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Internal PWM dimming Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Overtemperature Protection of the Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7
7.1
7.2
7.3
7.3.1
7.4
Open Load Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Electrical Characteristics: Open Load Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Open Load Diagnosis in different Application Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Light module application without µC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Application with µC connected to TLD5045EJ IC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
8
8.1
8.2
8.3
8.3.1
8.3.2
8.3.3
8.3.4
Application Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Output Peak current Adjustment via RSET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Switching Frequency Determination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
TLD5045EJ in different LED Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
TLD5045EJ in a Body Control Module (BCM) with µC Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Decentralized Light Module Application - DLM (Input configuration 1) . . . . . . . . . . . . . . . . . . . . . . . 25
Decentralized Light Module Application - DLM (Input configuration 2) . . . . . . . . . . . . . . . . . . . . . . . 26
Decentralized Light Module Application - DLM (Input configuration 3) . . . . . . . . . . . . . . . . . . . . . . . 27
9
Package Outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Data Sheet
2
Revision 1.0 2015-05-28
Not for Customers
TLD5045EJ
1
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Infineon® LITIX™ Power
Overview
Constant Current Generation
Wide Input Voltage Range from 5V to 40V
Peak Current Regulation
Very low current consumption (<2uA) in Sleep Mode
Integrated power transistor with low saturation voltage
Integrated fast freewheeling diode
Integrated load current sense resistor
Integrated status pull down transistor
Overtemperature Protection
PG-DSO-8 EP
Switching frequency (typ. 200kHz) adjustable via external RC network
External PWM Dimming Input
Integrated PWM Dimming Engine
Analog Dimming (output current adjustable via external low power resistor and possibility to connect PTC
resistor for LED protection during overtemperature conditions)
Stable switching frequency due to fix OFF-time concept with VREC (supply voltage) feedforward
Under- and Overvoltage shutdown with hysteresis
Small thermally enhanced exposed heatslug SMD package
Automotive AEC Qualified
Green Product (RoHS) Compliant
Description
The TLD5045EJ is a highly integrated smart LED buck controller with built in protection functions. The main
function of this device is to drive single or multiple series connected LEDs efficiently from a voltage source
higher than the LED forward voltage by regulating a constant LED current. The constant current regulation is
especially beneficial for LED color accuracy and long LED lifetime. The built in freewheeling diode and
switching transistor with current sense requires less external components and saves system costs. High
flexibility is achieved by placing low power resistors to adjust output currents up to 700mA and the regulator
switching frequency (typ. 200kHz). An integrated PWM dimming engine provides a LED dimming function by
placing a simple RC network to GND. This feature is dedicated for decentralized light modules without micro
controller involvement. In addition to that an integrated status pull down transistor can be used to simulate
a minimum current flow for decentralized modules to avoid a wrong open load detection by a highside switch
located in the body control module (BCM).
Application
•
Automotive LED driven Exterior Lighting: Brake, Tail, CHMSL, Daytime Running Light, Position Light
•
Automotive LED driven Interior Lighting: Reading Light, Dome Light, Display Backlighting
Type
Package
Marking
Device1
PG-DSO-8 EP
PG-DSO-8 EP
Data Sheet
3
Revision 1.0, 2015-05-28
Infineon® LITIX™ Power
TLD5045EJ
Block Diagram
2
Block Diagram
The TLD5045 regulates the LED current by monitoring the load current (Peak Current Measurement) through the
internal switch cycle by cycle. When the current through the switch reaches the threshold Ipeak the switch is shutOFF and it is kept OFF for a time equal to tOFF. Both Ipeak and tOFF can be fixed through few external components.
The peak current Ipeak is fixed by a resistor connected to the SET pin while the tOFF is fixed by RC network. As tOFF
is fixed and the duty cycle depends on VREC, the frequency depends on VREC as well. Refer to Chapter 8.2 for the
evaluation of the switching frequency.
PWMI
FREQ
EN
VREC
6
3
1
ON/OFF
Logic
5
Internal
Supply
UV+OV
Lockout
OFF-Time
Control
8
internal
PWM
Generation
PowerSwitch Driver
Logic
SW
Power
Switch
Thermal
Protection
ST
Peak Current
Measurement
2
Open Load
Detection
Figure 2-1
Data Sheet
Peak Current
Adjustment
4
7
SET
GND
Block Diagram TLD5045EJ
4
Revision 1.0
2015-05-28
Infineon® LITIX™ Power
TLD5045EJ
Pin Configuration
3
Pin Configuration
3.1
Pin Assignment
VREC
1
ST
TLD5045
8
SW
2
7
GND
EN
3
6
FREQ
SET
4
5
PWMI
EP
Figure 3-1
3.2
Table 3-1
Pin Configuration TLD5045EJ
Pin Definitions and Functions
sec_bias_prereg pin definition and function
#
Name
1
VREC
Voltage Recirculation Output and Internal Supply
Input;
This pin is the supply pin of the IC (see block diagram).
Furthermore the cathode of the integrated fast freewheeling diode is connected to this pin as well.
2
ST
Status Output;
Open collector diagnostic output to indicate an open
load failure.
Refer to Chapter 7 for more details.
3
EN
Enable;
Apply logic HIGH signal to enable the device
4
SET
SET Input;
Connect a low power resistor to adjust the output
current.
Data Sheet
Direction
Type
Function
5
Revision 1.0
2015-05-28
Infineon® LITIX™ Power
TLD5045EJ
Pin Configuration
Table 3-1
sec_bias_prereg pin definition and function (continued)
#
Name
5
PWMI
PWM Input;
PWM signal for dimming LEDs. Connect external R and C
combination to achieve an auto PWM-dimming function
with defined frequency and duty cycle.
1) internal PWM dimming function (external RC
connected to GND)
2) external PWM dimming function (µC is controlling this
pin)
Refer to Chapter 6 for more details.
6
FREQ
FREQuency Select Input;
Connect external Resistor and Capacitor to GND to set the
OFF-time of the switching frequency.
7
GND
Ground;
Connect to system ground.
SW
Integrated Power-Switch Output;
Collector of the integrated NPN-power transistor.
EP
Exposed Pad;
Connect to external heatspreading copper area with
electrically GND (e.g. inner GND layer of the PCB via
thermal vias)
Data Sheet
Direction
Type
Function
6
Revision 1.0
2015-05-28
Infineon® LITIX™ Power
TLD5045EJ
General Product Characteristics
4
General Product Characteristics
4.1
Absolute Maximum Ratings
Tj = -40°C to +150°C; all voltages with respect to ground (unless otherwise specified)
Table 4-1
Absolute Maximum Ratings1)
Parameter
Symbol
Values
Min.
Typ.
Unit
Max.
Note or
Test Condition
Number
Voltages
VREC (Pin 1)
Recirculation and
Supply Input
VREC
-0.3
VFW,SW
VREC (Pin 1)
Maximum current
flowing continuously
through the
freewheeling diode
and the power switch
ST (Pin 2)
Diagnostic Status
Output Voltage
VST
ST (Pin 2)
Diagnostic Status
Current
IST
-0.3
45
V
P_4.1.1
1.2
A
P_4.1.2
– Maximum
ambient
temperature must
be calculated with
given Rthja of the
application
45
V
P_4.1.3
150
mA
–no short circuit
protection and no
current limitation
implemented
P_4.1.4
EN (Pin 3)
VEN
Enable Input Voltage
-0.3
45
V
P_4.1.5
SET (Pin 4)
Peak Current Adjust
Input Voltage
VSET
-0.3
6
V
P_4.1.6
PWMI (Pin 5)
PWM Input Voltage
VPWMI
-0.3
6
V
P_4.1.7
FREQ (Pin 6)
VFREQ
OFF-time Adjustment
Input
-0.3
6
V
P_4.1.8
SW (Pin 8)
Switch Output
VSW
-0.3
45
V
P_4.1.9
Tj
-40
150
°C
P_4.1.10
-55
150
°C
P_4.1.11
Temperatures
Junction
Temperature
Storage Temperature TSW
Data Sheet
7
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Infineon® LITIX™ Power
TLD5045EJ
General Product Characteristics
Absolute Maximum Ratings1)
Table 4-1
Parameter
Symbol
Values
Min.
Typ.
Unit
Note or
Test Condition
Max.
Number
ESD Susceptibility
ESD Resistivity all
Pins to GND
VESD, HBM
-2
2
kV
HBM2) ESD Results P_4.1.12
available?
ESD Resistivity to
GND
VESD
-500
500
V
CDM3)
P_4.1.13
ESD Resistivity corner VESD
pins to GND
-750
750
V
CDM
P_4.1.14
1) Not subject to production test, specified by design.
2) ESD susceptibility HBM according to EIA/JESD 22-A 114B
3) ESD susceptibility, Charged Device Model “CDM” EIA/JESD22-C101 or ESDA STM5.3.1
Note:
1. 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.
2. 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.
4.2
Functional Range
Table 4-2
Functional Range
Parameter
Symbol
Values
Min.
Typ.
Unit
Note or
Test Condition
Max.
Number
Voltages
Extended Supply
Voltage
VREC
5
401)
V
Parameter
P_4.2.1
deviations possible
Nominal Supply
Voltage Range
VFW,SWREC
8
36
V
P_4.2.2
External Inductor
LSW
220
560
µH
Output current range IOUT
100
700
mA
Switching Frequency fSW
50
300
kHz
Junction
Temperature
-40
150
°C
Tj
max.560µH to
avoid OL
P_4.2.3
P_4.2.4
Tj = 25°C to 150°C
P_4.2.5
P_4.2.6
1) Not subject to production test, specified by design
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.
Data Sheet
8
Revision 1.0
2015-05-28
Infineon® LITIX™ Power
TLD5045EJ
General Product Characteristics
4.3
Thermal Resistance
Note: This thermal data was generated in accordance with JEDEC JESD51 standards.
For more information, go to www.jedec.org.
Table 4-3
Thermal Resistance
Parameter
Symbol
Values
Min.
Unit
Note or
Test Condition
Number
10
K/W
1)2)
P_4.3.1
40
K/W
1)3)
P_4.3.2
Typ.
Max.
Voltages
Junction to Case
RthJ-case
Junction to Ambient RthJA
(2s2p)
1) Not subject to production test, specified by design.
2) Specified RthJ-case value is simulated at natural convection on a cold plate setup (all pins and the exposed Pad are fixed to
ambient temperature). Ta=25°C, Power Switch and freewheeling diode are dissipating 1W.
3) Specified RthJA value is according to Jedec JESD51-2,-7 at natural convection on FR4 2s2p board; The Product
(Chip+Package) was simulated on a 76.2 x 114.3 x 1.5 mm board with 2 inner copper layers (2 x 70µm Cu, 2 x 35µm Cu).
According to JESD51-5 a thermal via array under the exposed pad contacted the first inner copper layer. Ta=25°C, Power
Switch and freewheeling diode are dissipating 1W.
Data Sheet
9
Revision 1.0
2015-05-28
Infineon® LITIX™ Power
TLD5045EJ
Electrical Characteristics
5
Electrical Characteristics
Tj = -40°C to +150°C, all voltages with respect to ground (unless otherwise specified)
5.1
General Parameters
Table 5-1
Electrical Characteristics
Parameter
Symbol
Values
Min.
Typ.
Max.
Unit
Note or
Test Condition
Number
Voltage Drop over
Power Transistor
VDrop,100
–
0.8
–
V
Ipeak=100mA
P_5.1.1
Voltage Drop over
Power Transistor
VDrop,700
–
1.4
–
V
Ipeak=700mA
P_5.1.2
Freewheeling diode
forward voltage
Vfw,100
–
0.8
–
V
Ipeak=100mA
P_5.1.3
Freewheeling diode
forward voltage
Vfw,700
–
1.4
–
V
Ipeak=700mA
P_5.1.4
Peak over current
limit
Ipeak_lim
–
1.4
–
A
Peak current
accuracy
Ipeak_acc
450
500
550
mA
VREC = 12V
VEN = 5V
VLED = 7.2V
RSET = 14kΩ
LSW = 220µH
fSW = 200kHz
P_5.1.6
Input under voltage
shutdown threshold
VREC,UVOFF
–
–
5
V
VEN = 5V
VREC decreasing;
see Figure 5-1
P_5.1.7
Input voltage startup VREC,UVON
threshold
–
–
6
V
VEN = 5V
VREC increasing;
see Figure 5-1
P_5.1.8
Input under voltage VREC,UVhyst
shutdown hysteresis
–
1
–
V
Input over voltage
shutdown threshold
VREC,OVOFF
40.5
–
–
V
VEN = 5V
VREC increasing;
see Figure 5-1
P_5.1.10
Input over voltage
startup threshold
VREC,OV
40
–
–
V
VEN = 5V
VREC decreasing;
see Figure 5-1
P_5.1.11
Input over voltage
VREC,OVhyst
shutdown hysteresis
–
0.5
–
V
Switch ON delay
–
400
600
ns
1)
–
P_5.1.13
ns
1)
–
P_5.1.14
Switch OFF delay
Data Sheet
tdON
tdOFF
–
500
850
10
P_5.1.5
P_5.1.9
P_5.1.12
Revision 1.0
2015-05-28
Infineon® LITIX™ Power
TLD5045EJ
Electrical Characteristics
Table 5-1
Electrical Characteristics
Parameter
Symbol
Values
Unit
Note or
Test Condition
Number
Min.
Typ.
Max.
Reference Voltage at VSET
SET pin
1.16
1.225
1.29
V
Pull up current for
FREQ pin
IFREQ
5
–
–
mA
Oscillator switch off
threshold
VFREQ,HIGH
–
3.2
–
V
P_5.1.17
Oscillator switch on
threshold
VFREQ,LOW
–
1.2
–
V
P_5.1.18
P_5.1.15
VFREQ=0V
P_5.1.16
1) The minimum switching ON time tON must be greater than tdON + tdOFF
5.2
Power Supply Monitoring
Over- and Undervoltage Shutdown
If the supply voltage VREC drops below the input under voltagae threshold voltage VREC,UVOFF, the power stage
is switched OFF and the device is in normal consumption mode (Iq,ON).
If VREC rises again and reaches the input undervoltage startup threshold VREC,UVON the power stage is restarted
and the device is back to normal operation mode.
Same behaviour applies to overvoltage.
The internal status transistor switches off during an overvoltage or undervoltage event on VREC.
A detailed description of the under and overvoltage behaviour is displayed in Figure 5-1 below.
Data Sheet
11
Revision 1.0
2015-05-28
Infineon® LITIX™ Power
TLD5045EJ
Electrical Characteristics
VREC
VREC,OVhyst
VREC,OVoff
VREC,OVon
VREC,UVhyst
VREC,UVon
VREC,UVoff
t
VSW
t
I LED
Iset
t
ST
t
ST pulldown ON
Figure 5-1
Data Sheet
ST pull-down transistor OFF
ST pulldown ON
ST pull-down transistor OFF
ST pulldown ON
Over- and Undervoltage Protection
12
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2015-05-28
Infineon® LITIX™ Power
TLD5045EJ
Enable, Dimming Function and Thermal Protection
6
Enable, Dimming Function and Thermal Protection
6.1
Description
Enable Function
A logic high signal on the EN pin turns the device on. A logic low signal on enable pin EN brings the device in sleep
mode. The current consumption is typ. 0.1 µA in this case. The EN pin has an internal pull down resistor which
ensures that the IC is in sleep mode and the power stage is switched off in case the pin EN is externally not
connected.
Dimming Function
The PWMI pin combines two functions:
1. PWM dimmming via a µC (3.3V and 5V µC)
2. Integrated PWM dimming engine for standalone solutions in decentralized light module (frequency and
duty cycle adjustable via external R,C network)
A detailed description of the PWMI pin is displayed in below.
VPWMI
PWMI OFF Æ DC=0%
VPWMI,OFF
Internal PWM
VPWMI,ON
PWMI ON Æ DC=100%
SWON
Figure 6-1
Data Sheet
SW - OFF
SWON
SW - OFF
SWON
SW - OFF
SWON
SW - OFF
t
PWMI Pin Description
13
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2015-05-28
Infineon® LITIX™ Power
TLD5045EJ
Enable, Dimming Function and Thermal Protection
6.2
Electrical Characteristics Enable, Bias, Dimming Function and Thermal
Protection
VREC = 4.5 V to 18 V, Tj = -40°C to +150°C, all voltages with respect to ground (unless otherwise specified)
Table 6-1
Electrical Characteristics: Enable, Bias, Dimming Function and Thermal Protection
Parameter
Symbol
Values
Min.
Typ.
Max.
Unit
Note or
Test Condition
Number
Current
Consumption,
sleep mode
Iq,OFF
–
0.1
2
µA
VEN = 0V;
VREC = 16V
P_6.2.1
Current
Consumption,
active mode (Open
Load)
Iq,ON
–
–
5
mA
VEN = 5.0V;
Ipeak = 0mA (open
load);
VREC = 16V
P_6.2.2
Current
Consumption,
active mode
Iq,ON
–
–
10
mA
VEN = 5.0V;
Ipeak = 700mA
VREC = 16V
P_6.2.3
EN
Turn On Threshold
VEN,ON
2.8
–
–
V
–
P_6.2.4
EN
Turn Off Threshold
VEN,OFF
–
–
0.8
V
EN
high input current
IEN,hi
–
100
–
µA
VEN = 5V
P_6.2.6
EN
low input current
IEN,lo
0
–
20
µA
VEN = 0.5V
P_6.2.7
PWMI
Turn On Threshold
VPWMI,ON
–
1
–
V
see Figure 6-1
P_6.2.8
PWMI
Turn Off Threshold
VPWMI,OFF
–
2
–
V
see Figure 6-1
P_6.2.9
PWMI
source current
IPWMI
–
250
–
µA
Rset = 10kΩ
VPWMI = 0.5V;
P_6.2.10
Over temperature
shutdown
Tj,sd
150
175
–
°C
1)
P_6.2.11
–
15
–
K
1)
P_6.2.12
Over temperature
Tj,sd_hyst
shutdown hysteresis
P_6.2.5
1) Specified by design. Not subject to production test.
Data Sheet
14
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Infineon® LITIX™ Power
TLD5045EJ
Enable, Dimming Function and Thermal Protection
6.2.1
PWM Dimming with µC connected to TLD5045EJ PWMI pin
The PWMI pin can be used for PWM dimming. It is a commonly practiced dimming method to prevent color shift
in LED light applications.
TPWMI
VPWMI
VPWMI,OFF
VPWMI,ON
t
tOFF
Ipeak
t
SW - OFF
Figure 6-2
Data Sheet
SW - ON
SW - OFF
SW - ON
SW - OFF
Timing Diagram for LED Dimming with µC
15
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TLD5045EJ
Enable, Dimming Function and Thermal Protection
6.2.2
Internal PWM dimming Function
The TLD5045EJ has an integrated PWM dimming engine. Via an external RPWM and CPWM network it is possible
to achieve a PWM LED current waveform. The duty cycle and dimming frequency is depending on the size of the
external components (see formula in Figure 6-4). This feature is specially designed to achieve a stand alone
PWM dimming function without the usage of micro controllers or external logic. This allows a flexible and cost
effective usage of the device in a decentralized light module application (refer to application drawing ).
The advantage of a PWM dimming (to reduce the LED load current) is the change of light intensity only, at constant
light color.
With an external RC network a PWM programming between 100Hz and 1200Hz and Duty Cycles between 4%
and max. 20%. is possible. Figure 6-3 displays the external components corresponding to the desired PWM
frequency and duty cycle.
The following setup applies for the table displayed in Figure 6-3: VREC=12V, VLED=7.2V, LSW=220µH, RSET=14kΩ.
Figure 6-3
Data Sheet
RPWMI
CPWMI
fPWMI
216k Ω
216k Ω
216k Ω
216k Ω
87k Ω
87k Ω
87k Ω
87k Ω
44k Ω
44k Ω
44k Ω
44k Ω
64nF
32nF
21nF
16nF
150nF
75nF
50nF
37nF
265nF
132nF
88nF
66nF
100Hz
200Hz
300Hz
400Hz
100Hz
200Hz
300Hz
400Hz
100Hz
200Hz
300Hz
400Hz
DC
4%
4%
4%
4%
10%
10%
10%
10%
20%
20%
20%
20%
RPWMI and CPWMI versus fPWMI and DC
16
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TLD5045EJ
Enable, Dimming Function and Thermal Protection
6.3
Overtemperature Protection of the Device
A temperature sensor at the power stage causes the overheated device to switch OFF to prevent destruction.
During over temperature condition the internal ST transistor is switched OFF. Due to the autorestart function of
the device the status signal will toggle accordingly. The timing of this pattern is dependant on the thermal capability
of the application and can be used to distinguish between open load error and overtemperature condition. More
details on the overtemperature behavior is displayed in Figure 6-4 below.
VEN
H
L
t
Tj
TjSD
ΔΤ
TjSO
t
Ta
VSW
t
ILED
I peak
t
ST
t
ST pulldown OFF
Figure 6-4
Data Sheet
ST pull-down transistor ON
ST
OFF
ST
ON
ST
OFF
ST
ON
ST
OFF
ST
ON
ST
OFF
RPWMI and CPWMI versus fPWMI and DC
17
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Infineon® LITIX™ Power
TLD5045EJ
Open Load Diagnosis
7
Open Load Diagnosis
7.1
Description
The TLD5045EJ has an integrated open load during ON diagnosis. During normal operation the ST pin (open
collector output) is pulled to GND (internal transistor is ON). The open load detection is realized by monitoring the
switching behavior at the SW pin. During an open load event the integrated power stage at the SW pin will be
statically turned ON. If the output stage is turned ON for more than the open load diagnosis delay time (tOL) an
open load condition is detected. An open load event will switch OFF the internal transistor. If a µC is connected to
the ST pin an external pull up resistor should be placed to achieve a logic HIGH level for the proper open load
error signalling reporting. For a timing diagram on the functionality of the open load diagnosis please refer to
Figure 7-1 and Figure 7-2.
7.2
Electrical Characteristics: Open Load Diagnosis
VREC = 4.5 V to 18 V, Tj = -40°C to +150°C, all voltages with respect to ground (unless otherwise specified)
Table 7-1
Parameter
Functional Range
Symbol
Values
Unit
Note or
Test Condition
Number
Min.
Typ.
Max.
Open Load diagnosis tOL
DelayTime
20
–
–
µs
P_7.2.1
Open Load diagnosis IOL
current
–
50
–
mA
P_7.2.2
Voltage Drop over
VDrop,ST
internal ST transistor
–
0.3
–
V
Voltages
Data Sheet
18
IST=150mA
P_7.2.3
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Infineon® LITIX™ Power
TLD5045EJ
Open Load Diagnosis
7.3
Open Load Diagnosis in different Application Conditions
7.3.1
Light module application without µC
Most of the time, the open load diagnosis of the whole light module is done via the current sense of the driver IC
(e.g. PROFET) located in the light control module (or BCM module). See Figure 8-6 for a simplified application
schematic. The light module needs to sink a specified minimum current (e.g. 100mA) to indicate normal operation.
To guarantee this minimum current also under light load conditions (e.g. high efficiency LED bin at high supply
voltages = min. load current required) system designers often have to place resistors in parallel to the application
circuit (see Resistors connected to supply lines in Figure 8-6). When using such resistors connected between VS
and GND, an open LED diagnosis is not possible anymore. To overcome this issue an internal transistor (open
collector) is connected to the ST pin of the TLD5045EJ. During normal operation the ST pin is LOW and a minimum
module current can be guaranteed.
As soon as an open load occurs the internal ST transistor switches off. Due to this, the current on the VREC pin
decreases below the open load detection threshold of the driver IC located in the light control module.
Note: Open Load is only detected during the ON cycle of the switching transistor. During the OFF state the ST
signal displays what was detected in the previous ON state.
VPWMI
VPWMI,OFF
VPWMI,ON
t
Open Load
Event
Open Load
t
VSW
High - z
t
tOL
ST
t
ST pull -down transistor ON
Figure 7-1
Data Sheet
ST pull-down transistor OFF
Open Load Diagnosis using Internal PWM Mode
19
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Infineon® LITIX™ Power
TLD5045EJ
Open Load Diagnosis
7.4
Application with µC connected to TLD5045EJ IC
The ST pin can be connected directly to a µC input. During an open load condition the ST transistor is OFF. An
external pull up resistor connected to VDD is required to signal a logic high signal on the ST pin during an open
load error. Please consider that this diagnosis functionality is only active if the device is in active mode (HIGH
potential at the EN pin).
Refer to application drawing Figure 8-5.
VEN
High
Low
t
VPWMI
TPWMI
VPWMI,OFF
VPWMI,ON
SW - OFF
SW - ON
SW - OFF
SW - ON
SW - OFF
t
VSW
High - z
t
Open Load
Event
Open Load
t
t OL
ST
ST pull -down transistor ON
Figure 7-2
Data Sheet
ST pull-down transistor OFF
t
Open Load diagnosis via µC connected to ST pin
20
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Infineon® LITIX™ Power
TLD5045EJ
Application Information
8
Application Information
Note: The following 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.
8.1
Output Peak current Adjustment via RSET
The external resistor RSET is used to adjust the peak current of the regulator. Maximum achievable peak current
is 700mA and minimum achievable peak current is 100mA. The SET pin provides an internally fixed voltage level
at typ.: 1.225V. Out of this considerations the equation is:
(8.1)
Ipeak
⎛ 1 . 225 V ⎞
⎟ ⋅ 5710
= ⎜
⎜ R SET
⎟
⎝
⎠
The factor 5710 is derived from following considerations:
•
Ipeak, max = 700mA (RSET = 10kΩ)
•
Ipeak,min = 100mA (RSET = 70kΩ)
Internal comparator voltage at SET pin = 1.225V.
The circuitry behind the SET pin is adjusting higher peak currents with lower RSET values.
The RSET value should be in the range from 10kΩ to 70kΩ to achieve the requested peak current range.
The following setup applies for the table displayed in Figure 8-1: VREC=12V, VLED=7.2V, LSW=220µH.
IPEAK [mA]
RSET [kΩ]
100
70
200
35
300
23
400
18
500
14
600
12
700
10
Figure 8-1
Data Sheet
RSET Resistor Selection
21
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TLD5045EJ
Application Information
8.2
Switching Frequency Determination
With the external RFREQ, CFREQ and RCOMP network, it is possible to adjust the switching frequency of the regulator.
To ensure a stable frequency over a broad range of input voltage VREC an external resistor RCOMP can be used.
The following setup applies for the table displayed in Figure 8-3: VREC=12V, VLED=7.2V, LSW=220µH, RSET=14kΩ.
1
RCOMP
VREC
FREQ
6
TLD5045
CFREQ
RFREQ
GND
7
Figure 8-2
Setting tOFF Time of Regulator with External RFREQ, CFREQ Network
Rcomp
Rfreq
Cfreq
fsw
toff
255.8k Ω
115.8k Ω
69.7k Ω
46.8k Ω
72.8k Ω
52.7k Ω
17.1k Ω
7.7k Ω
4.6k Ω
3.1k Ω
4.9k Ω
3.5k Ω
220pF
220pF
220pF
220pF
100pF
100pF
50kHz
100kHz
150kHz
200kHz
250kHz
300kHz
6.47μs
3.19μs
2.12μs
1.59μs
1.27μs
1.06μs
Figure 8-3
Data Sheet
RFREQ, CFREQ versus fSW Table
22
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Infineon® LITIX™ Power
TLD5045EJ
Application Information
VEN
High
Low
t
VFREQ
VFREQ,high
VFREQ,low
t
ILED
I set=Ipeak
Imin
VSW
I ripple
ton
tup
toff
tdown
t
VREC+Vfw
Vdrop
Transistor
Figure 8-4
Data Sheet
Diode
T
Diode
T
Diode
T
Diode
T
Diode
t
Theoretical Operating Waveforms
23
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Infineon® LITIX™ Power
TLD5045EJ
Application Information
8.3
TLD5045EJ in different LED Applications
8.3.1
TLD5045EJ in a Body Control Module (BCM) with µC Interface
Figure 8-5 provides a simplified application with two high brightness LEDs in series. A µC is controlling the EN
pin to put the device into sleep/active mode. Also the PWMI pin can be directly controlled via a µC port if PWM
dimming of the LED current is required. The open load ST pin monitors the load condition of the application
and gives feedback to the µC. An external pull up resistor is recommended to achieve a logic HIGH signal
during an open load error (internal status transistor is switched OFF and the ST pin is high ohmic an external
pull up resistor ensures a logic HIGH signal).
The external low power resistor RSET is used to set the required peak current for the LED load (refer to Figure 8-1
for more details).
To set the desired switching frequency of the buck regulator the external RFREQ and CFREQ network must be
connected to GND (reference values are given in Figure 8-3).
ILED
Vs = 5V to 40V
LSW
1
CREC
VREC
SW
8
VDD
7
open load status
connected to µC
RST
2
GND
ST
RFREQ
FREQ
CFREQ
6
RCOMP
connect to µC pin
3
EN
4
SET
VREC
RSET
Figure 8-5
PWMI
TLD5045
5
REMC
PWM dimming via µC
Simplified Application Diagram TLD5045EJ
Note: This is a very simplified example of an application circuit. The function must be verified in the real
application
Data Sheet
24
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Infineon® LITIX™ Power
TLD5045EJ
Application Information
8.3.2
Decentralized Light Module Application - DLM (Input configuration 1)
The connection between the Body Control Module (BCM) and the Decentralized Light Module is realized via one
supply line and one GND connection.
The supply line could change between two different operation modes:
1. Light Function 1 - Daytime Running Light (DRL) mode: If the supply line is permanently ON, the DRL
application which requires higher LED current (e.g. 400mA) is active. The proper RSET resistor should be
placed to achieve the desired load current (e.g 18kΩ).
2. Light Function 2 - Position Light (PL) mode: During a PWM signal (e.g. 200Hz) on the supply line the mean
LED current is reduced to a lower level (e.g. 50mA) and the application is entering into PL mode. The enable
pin of the TLD5045EJ is a high voltage pin (max. 45V) and can be directly connected via a resistor REN
before the reverse polarity protection diode of the module to achieve a fast capture of the PWM signal. The
PWMI pin is connected to GND (inverse logic = ON).
To simulate a module current during light load conditions, the ST pin can be connected via a resistor to the
supply voltage line. (refer to Chapter 7 for a detailed description of the ST behavior)
For a decentralized solution without micro controller involvement the possibility to connect a PTC resistor at
the SET pin is a cost effective solution to protect the LED load from thermal destruction.
Vbat
Wire Harness
Inductance
Decentralized Light Module
I LED
Light Function 1
(e.g. DRL)
BCM - module
GND
REN
LSW
I Open_load
1
VREC
SW
8
CREC
3
EN
7
GND
5
PWMI
RFREQ
FREQ
CFREQ
6
RCOMP
VREC
I ST,PD
2
ST
SET
RSET
TLD5045
Figure 8-6
4
RPTC
Application Diagram of Decentralized Light Module without µC (input config 1)
Note: This is a very simplified example of an application circuit. The function must be verified in the real
application
Data Sheet
25
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Infineon® LITIX™ Power
TLD5045EJ
Application Information
8.3.3
Decentralized Light Module Application - DLM (Input configuration 2)
In this particular input configuration two supply lines are tied together on the DLM. The following input states
must be considered to distinguish between Light Function 1 (DRL mode) and Light Function 2 (PL mode).
1. 1) Condition: DRL = ON, PL = OFF. Desired function: DRL mode (e.g. 400mA LED load current)
2. 2) Condition: DRL = OFF, PL = ON. Desired function: PL mode (e.g. 50mA LED load current)
3. 3) Condition: DRL = ON, PL =ON. Desired function: PL mode (e.g. 50mA LED load current)
To achieve a lower mean LED load current during the PL mode the integrated PWM engine is a useful feature.
The external RPWM and CPWM circuit predefines a dedicated PWM frequency and duty cycle. (for details refer
to Figure 8-2)
To simulate a module current during light load conditions the ST pin can be connected via resistors to both
supply voltage lines. (refer to Chapter 7 for a detailed description of the ST behavior)
For a decentralized solution without micro controller involvement the possibility to connect a PTC resistor at
the SET pin is a cost effective solution to protect the LED load from thermal destruction.
Vbat
Wire Harness
Inductance
Decentralized Light Module
Vbat
BCM - module
Light Function 1
(e.g. DRL)
I LED
Light Function 2
(e.g. PL)
TDIM2
GND
LSW
IOpen_load
1
REN
VREC
SW
8
CREC
3
EN
7
GND
5
TDIM1
CPWM
RPWM
PWMI
RFREQ
FREQ
R DIM1
CFREQ
6
RCOMP
VREC
I ST,PD
2
ST
SET
RSET
TLD5045
Figure 8-7
4
RPTC
Application Diagram of Decentralized Light Module without µC (input config 2)
Note: This is a very simplified example of an application circuit. The function must be verified in the real
application
Data Sheet
26
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Infineon® LITIX™ Power
TLD5045EJ
Application Information
8.3.4
Decentralized Light Module Application - DLM (Input configuration 3)
A permanent supply chooses the Light Function 1 (DRL mode) and a second dedicated PWM supply between
100Hz and 200Hz switches to Light Function 2 (PL mode). For this input configuration it is possible to connect
the PWM dimming output of the BCM directly to the PWMI input of the TLD5045EJ. To simulate a module
current during light load conditions the ST pin can be connected via a resistor to the permanent supply
voltage line. (refer to Chapter 7 for a detailed description of the ST behavior)
For a decentralized solution without micro controller involvement the possibility to connect a PTC resistor at
the SET pin is a cost effective solution to protect the LED load from thermal destruction. (for details refer to
Figure 8-6)
Vbat
Wire Harness
Inductance
Decentralized Light Module
Vbat
BCM - module
I LED
Light Function 1
(e.g. DRL)
Light Function 2
(e.g. PL)
LSW
GND
CREC
I Open_load
1
VREC
SW
8
REN
3
EN
RLIM
7
GND
5
DLIM
REMC
PWMI
RFREQ
FREQ
CFREQ
6
RCOMP
VREC
I ST,PD
2
ST
SET
RSET
TLD5045
Figure 8-8
4
RPTC
Application Diagram of Decentralized Light Module without µC (input config 3)
Note: This is a very simplified example of an application circuit. The function must be verified in the real
application
Data Sheet
27
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Infineon® LITIX™ Power
TLD5045EJ
Package Outlines
9
Package Outlines
0.35 x 45˚
0.41±0.09 2)
0.2
M
0.19 +0.06
0.08 C
Seating Plane
C A-B D 8x
0.64 ±0.25
D
0.2
6 ±0.2
8˚ MAX.
C
1.27
0.1 C D 2x
1.7 MAX.
Stand Off
(1.45)
0.1+0
-0.1
3.9 ±0.11)
M
D 8x
Bottom View
8
1
5
1
4
8
4
5
2.65 ±0.2
3 ±0.2
A
B
4.9 ±0.11)
0.1 C A-B 2x
Index Marking
1) Does not include plastic or metal protrusion of 0.15 max. per side
2) Dambar protrusion shall be maximum 0.1 mm total in excess of lead width
3) JEDEC reference MS-012 variation BA
Figure 9-1
PG-DSO-8-27-PO V01
Outline PG-DSO-8 EP
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).
Data Sheet
28
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Infineon® LITIX™ Power
TLD5045EJ
Revision History
Revision 1.0, 2015-05-28
Page or Item
Subjects (major changes since previous revision)
Rev1.0
Initial Data Sheet for TLD5045EJ
Data Sheet
Responsible Date
2011-05-27
29
Revision 1.0 2015-05-28
Trademarks of Infineon Technologies AG
AURIX™, C166™, CanPAK™, CIPOS™, CoolGaN™, CoolMOS™, CoolSET™, CoolSiC™, CORECONTROL™, CROSSAVE™, DAVE™, DI-POL™, DrBLADE™, EasyPIM™,
EconoBRIDGE™, EconoDUAL™, EconoPACK™, EconoPIM™, EiceDRIVER™, eupec™, FCOS™, HITFET™, HybridPACK™, Infineon™, ISOFACE™, IsoPACK™, iWafer™, MIPAQ™, ModSTACK™, my-d™, NovalithIC™, OmniTune™, OPTIGA™, OptiMOS™, ORIGA™, POWERCODE™, PRIMARION™, PrimePACK™,
PrimeSTACK™, PROFET™, PRO-SIL™, RASIC™, REAL3™, ReverSave™, SatRIC™, SIEGET™, SIPMOS™, SmartLEWIS™, SOLID FLASH™, SPOC™, TEMPFET™,
thinQ!™, TRENCHSTOP™, TriCore™.
Other Trademarks
Advance Design System™ (ADS) of Agilent Technologies, AMBA™, ARM™, MULTI-ICE™, KEIL™, PRIMECELL™, REALVIEW™, THUMB™, µVision™ of ARM Limited,
UK. ANSI™ of American National Standards Institute. AUTOSAR™ of AUTOSAR development partnership. Bluetooth™ of Bluetooth SIG Inc. CAT-iq™ of DECT
Forum. CIPURSE™ of OSPT Alliance. COLOSSUS™, FirstGPS™ of Trimble Navigation Ltd. EMV™ of EMVCo, LLC (Visa Holdings Inc.). EPCOS™ of Epcos AG.
FLEXGO™ of Microsoft Corporation. HYPERTERMINAL™ of Hilgraeve Incorporated. MCS™ of Intel Corp. IEC™ of Commission Electrotechnique Internationale.
IrDA™ of Infrared Data Association Corporation. ISO™ of INTERNATIONAL ORGANIZATION FOR STANDARDIZATION. MATLAB™ of MathWorks, Inc. MAXIM™ of
Maxim Integrated Products, Inc. MICROTEC™, NUCLEUS™ of Mentor Graphics Corporation. MIPI™ of MIPI Alliance, Inc. MIPS™ of MIPS Technologies, Inc.,
USA. muRata™ of MURATA MANUFACTURING CO., MICROWAVE OFFICE™ (MWO) of Applied Wave Research Inc., OmniVision™ of OmniVision Technologies,
Inc. Openwave™ of Openwave Systems Inc. RED HAT™ of Red Hat, Inc. RFMD™ of RF Micro Devices, Inc. SIRIUS™ of Sirius Satellite Radio Inc. SOLARIS™ of
Sun Microsystems, Inc. SPANSION™ of Spansion LLC Ltd. Symbian™ of Symbian Software Limited. TAIYO YUDEN™ of Taiyo Yuden Co. TEAKLITE™ of CEVA,
Inc. TEKTRONIX™ of Tektronix Inc. TOKO™ of TOKO KABUSHIKI KAISHA TA. UNIX™ of X/Open Company Limited. VERILOG™, PALLADIUM™ of Cadence Design
Systems, Inc. VLYNQ™ of Texas Instruments Incorporated. VXWORKS™, WIND RIVER™ of WIND RIVER SYSTEMS, INC. ZETEX™ of Diodes Zetex Limited.
Trademarks Update 2014-11-12
www.infineon.com
Edition 2015-05-28
Published by
Infineon Technologies AG
81726 Munich, Germany
© 2014 Infineon Technologies AG.
All Rights Reserved.
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examples or hints given herein, any typical
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