User guide

3
CONTENTS
1. Introduction 4
1.1. Features and benefi ts 5
2. LEDset specifi cations 6
2.1. General overview 6
2.2. LEDset characteristic 7
2.2.1. General description 7
2.2.2. Implementation in the OSRAM ECG 8
2.3. Technical details 9
2.3.1. Bias current (Iset) 9
2.3.2. +12Vset 9
2.3.3. Fault protection 9
2.3.4. Insulation 9
2.3.5. Color coding 10
2.3.6. Cable length 10
2.3.7. Fault conditions/troubleshooting 10
2.3.7.1. Incorrect wiring 10
2.3.7.2. Missing control wire (Vset) 10
2.3.8. Connection of multiple ECGs 11
3. LEDset applications 12
3.1. Current setting 12
3.1.1. Setting by external resistor 12
3.1.2. Step dimming (StepDIM) 15
3.2. Local dimming 17
3.2.1. Potentiometer application 17
3.2.2. Light sensor application 18
3.2.2.1. Using OSRAM DIM
MICO/PICO 18
3.2.2.2. Using customized sensors 19
3.2.2.3. General notes on local
dimming: LEDset, “current set”
combination 20
3.3. Thermal derating 22
3.3.1. Overtemperature protection 24
3.3.1.1. Application solution 1 –
TMP300 solution 24
3.3.1.2. Application solution 2 –
LM26 solution 26
3.3.1.3. Application solution 3 –
NPC SM6611 solution 27
3.3.1.4. Application solution 4 –
SI S-5841 solution 28
3.3.1.5. Application solution 5 –
MM3488 solution 29
3.3.1.6. Application solution 6 –
TC620(1) solution 30
3.3.1.7. General notes on IC
temperature switches:
choice and usage 33
3.3.2. Overtemperature protection
(discrete NTC) 34
3.3.2.1. Application solution 1 –
overtemperature protection
by comparator 34
3.3.2.2. Application solution 2 –
overtemperature management
by comparator:
two-step output 36
3.3.2.3. Application solution 3 –
overtemperature management:
continuous derating
and switch-off 38
3.3.2.4. Application solution 4 –
LEDset and current set
combination: direct NTC
connection 40
3.3.2.5. Application solution 5 –
overtemperature management:
microcontroller
(MCU) approach 42
3.4. +12Vset auxiliary supply 46
3.4.1. Aesthetic use 46
3.4.2. Active cooling 47
3.5. Constant lumen output 48
3.6. Combination of features 49