Infineon TLD5098EP User manual
Boost to battery evaluation kit
User Manual
TLD5098EP
About this document
Product description
The TLD5098EP is an AEC qualified DC-DC boost controller, especially designed to drive LEDs.
• Built-in diagnosis and protection features
• Designed to support multiple topologies such as Boost, Buck, Buck-Boost, SEPIC and Flyback
Scope and purpose
Scope of this user manual is to provide instructions on the usage of TLD5098EP boost to battery evaluation
board.
Intended audience
This document is intended for engineers who need to perform measurements and check performances with
TLD5098EP boost to battery evaluation board.
Table of contents
About this document . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table of contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
2 Quick start procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
3 Current adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
4 Power derating (battery dependent current) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
5 Cold crank survival circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6 Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
7 PCB layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
8 Bill of material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
9 Eiciency measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
10 Maximizing eiciency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
11 Minimizing EM emissions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
User Manual
www.infineon.com 2020-09-17
Disclaimer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Please read the Important Notice and Warnings at the end of this document
Boost to battery evaluation kit
TLD5098EP
1 Description
1 Description
Evaluation board for high power LED application with TLD5098EP product in boost to battery topology.
The default configuration of the board is boost to battery topology without any additional features enabled. In
this configuration it can deliver up to 21 W to the load with an eiciency above 85%. Auxiliary circuits, which
protect the DC-DC and the load during short to ground, are present.
The board is also equipped with the following features that are enabled by jumpers:
• Output current adjustment trimmer
• Power derating circuitry
• Cold crank survival circuit (CCSC)
Figure 1 Board picture
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1 Description
Figure 2 Simplified schematic
Table 1 Performance summary
Parameter Conditions Value
Input supply voltage Jumper X9 in position 2-3 (CCSC deactivated)
Parameter degradation below 6.5 V
Input supply voltage Jumper X9 in position 1-2 (CCSC active) 8 V to 27 V
Output current Jumper X12 open 1 A
Switching frequency VIN = 13.2 V 400 kHz
Eiciency Measured with 7 white standard LED 3 V @ 1 A
output current
Output voltage range Output voltage related to positive input 16 V to 23 V
Output overvoltage
protection
Output voltage related to ground 59 V
8 V to 27 V
(Down to 6.5 V for less than
2 s)
(Down to 3.0 V for less than
2 s)
> 85%
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2 Quick start procedure
2 Quick start procedure
The default configuration of the board has all additional features disabled. In this configuration the output
current cannot be adjusted. The PWM signal has to be applied as digital signal on X18 (max. 45 V).
Jumpers are populated as follows:
Jumper number Condition Meaning
X9 Close 2-3 Disable CCSC
X10 Close 2-1 Disable battery dependent current
The default configuration is depicted below:
Figure 3 Default configuration of the board
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3 Current adjustment
3 Current adjustment
The output current adjustment can be performed by changing the value of trimmer R15 with a screwdriver,
when X10 is closed in position 1-2 and X12 is closed. The output current can vary from 0 to 100% of the
maximum output current (in this evaluation board from 0 to 1 A). By removing the X12 jumper the output
current will reach its maximum value. The PWM signal has to be applied as digital signal on X18 (max. 45 V).
Jumpers are populated as follows:
Jumper number Condition Meaning
X9 Close 2-3 Disable CCSC
X10 Close 2-1 Disable battery dependent current
X12 Closed Adjustable output current enabled
Figure 4 Current adjustment
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4 Power derating (battery dependent current)
4 Power derating (battery dependent current)
The power derating acts by reducing V
(and thus the output current) when the battery voltage drops below
SET
8 V. It works better when R15 is trimmed to its maximum value. Otherwise a dierent derating profile is applied.
If a dierent derating profile is needed, R14 has to be changed. The aim is to have 1.6 V on pin SET when the
battery voltage reaches the desired threshold, below which the output current must decrease proportionally.
R14 can be calculated using:
(1)
V
BATT
R14 = R15 + R18 ⋅
1.6
− 1
where:
• R15 = 10 kΩ
• R18 = 560 Ω
For example, if the power derating should start when the battery voltage drops under 12 V, R14 must be
replaced with a 68 kΩ 0603 resistor (please refer to the TLD5098EP datasheets for more information).
The PWM signal has to be applied as digital signal on X18 (max. 45 V).
Jumpers are populated as follows:
Jumper number Condition Meaning
X9 Close 2-3 Disable CCSC
X10 Close 2-3 Enable battery dependent current
X12 Closed Adjustable output current enabled
Figure 5 Power derating
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