OSRAM OPTOTRONIC Constant current LED power supplies with 3DIM User Manual
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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