Datasheet

12
MSL2021 [DATASHEET]
42062A–LED–02/2013
7. Pinout and Pin Description
7.1 Pinout MSL2021
7.2 Pin Descriptions
1
2
3
4
5
6
18
17
16
15
14
13
7 8 9 10 11 12
24 23 22 21 20 19
FBO
EN
PWM
SCL
SDA
FLTB
S
NC
PVIN
DRV
PGND
CS
VDD AGND VCC AVIN D G
NC
THM
REXT
TOFF
DNC
CGND
MSL2021
(TOP VIEW)
Name Pin Description
FBO 1
Feedback Output
Feedback output from Efficiency Optimizer. Connect FBO to the LED power supply regulation
feedback node to control V
LED
. When unused connect FBO to VCC.
EN 2
Enable Input (Active High)
Drive EN high to turn on the MSL2021, drive EN low to turn it off. For automatic start-up connect EN to
AVIN.
PWM 3
PWM Dimming Input
Drive PWM with a pulse-width modulated signal to control LED brightness. See “PWM and LED
Brightness” on page 20 for details.
SCL 4
Serial Clock Input
SCL is the I²C serial interface clock input. See “I²C Serial Interface ” on page 31 details.
SDA 5
Serial Data Input/Output
SDA is the I²C serial interface data I/O. See “I²C Serial Interface ” on page 31 details.
FLTB 6
Fault Output (Open Drain, Active Low)
FLTB sinks current to AGND when a fault condition exists. Toggle EN low then high to clear FLTB, or
clear faults through the serial interface (see “Fault Status register (FAULTSTAT, 0x23), Read Only” on
page 29). Use the serial interface to access fault information and to enable/disable fault response.