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AS1102 Fiches technique(PDF) 8 Page - ams AG

No de pièce AS1102
Description  Low-Dropout LED Drivers
PDF  13 Pages
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Fabricant  AMSCO [ams AG]
Site Internet  http://www.ams.com
Logo AMSCO - ams AG

AS1102 Fiches technique(HTML) 8 Page - ams AG

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www.austriamicrosystems.com
Revision 1.3
8 - 13
AS1101, AS1102, AS1103, AS1104
austriamicrosystems
Data Sheet
Setting the LED Current
7.1 Setting the LED Current
The current going into the LEDs is approximately OCMR times greater then the current ISET. LED current is controlled
by VSET and RSET (see Figure 4) according to the formula:
For VSET = 3V and a specific LED current, the RSET value can be determined using the diagram shown in Section 6
Typical Performance Characteristics on page 5. For any other option, the value of ISET can be determined using the
graph “ISET vs. VCTRL” on page 7.
LED Brightness can also be adjusted by driving pin ENABLE or pin CTRL with a PWM signal.
ILED = OCMR x (VSET - VCTRL)
RSET
(EQ 1)



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