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LM3445MX Scheda tecnica(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Il numero della parte LM3445MX
Spiegazioni elettronici  Triac Dimmable Offline LED Driver
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Produttore elettronici  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3445MX Scheda tecnica(HTML) 2 Page - National Semiconductor (TI)

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Connection Diagrams
Top View
30060303
10-Pin MSOP
NS Package Number MUB10A
Top View
30060373
14-Pin SOIC
NS Package Number M14A
Ordering Information
Order Number
Spec.
Package Type
NSC Package
Drawing
Top Mark
Supplied As
LM3445MM
NOPB
MSOP-10
MUB10A
SULB
1000 Units, Tape and Reel
LM3445MMX
NOPB
MSOP-10
MUB10A
SULB
3500 Units, Tape and Reel
LM3445M
NOPB
SOIC-14L
M14A
LM3445M
55 Units, Rail
LM3445MX
NOPB
SOIC-14L
M14A
LM3445M
2500 Units, Tape and Reel
Pin Descriptions
SOIC
MSOP
Name
Description
12
1
ASNS
PWM output of the triac dim decoder circuit. Outputs a 0 to 4V PWM signal with a duty cycle
proportional to the triac dimmer on-time.
13
2
FLTR1
First filter input. The 120Hz PWM signal from ASNS is filtered to a DC signal and compared to a 1
to 3V, 5.85 kHz ramp to generate a higher frequency PWM signal with a duty cycle proportional to
the triac dimmer firing angle. Pull above 4.9V (typical) to tri-state DIM.
14
3
DIM
Input/output dual function dim pin. This pin can be driven with an external PWM signal to dim the
LEDs. It may also be used as an output signal and connected to the DIM pin of other LM3445s or
other LED drivers to dim multiple LED circuits simultaneously.
1
4
COFF
OFF time setting pin. A user set current and capacitor connected from the output to this pin sets
the constant OFF time of the switching controller.
3
5
FLTR2
Second filter input. A capacitor tied to this pin filters the PWM dimming signal to supply a DC voltage
to control the LED current. Could also be used as an analog dimming input.
4
6
GND
Circuit ground connection.
7
7
ISNS
LED current sense pin. Connect a resistor from main switching MOSFET source, ISNS to GND to
set the maximum LED current.
8
8
GATE
Power MOSFET driver pin. This output provides the gate drive for the power switching MOSFET
of the buck controller.
9
9
V
CC
Input voltage pin. This pin provides the power for the internal control circuitry and gate driver.
10
10
BLDR
Bleeder pin. Provides the input signal to the angle detect circuitry as well as a current path through
a switched 230
Ω resistor to ensure proper firing of the triac dimmer.
2,5,6,11
-
N/C
No Connect
www.national.com
2


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