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LM3445MX Arkusz danych(PDF) 3 Page - Texas Instruments

Numer części LM3445MX
Szczegółowy opis  TRIAC Dimmable Offline LED Driver
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Strona internetowa  http://www.ti.com
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background image
1
4
3
2
14
11
12
13
N/C
N/C
ASNS
DIM
GND
FLTR1
COFF
FLTR2
5
10
N/C
BLDR
6
N/C
7
ISNS
9 VCC
8 GATE
1
4
3
2
10
7
8
9
ISNS
FLTR1
GATE
BLDR
COFF
VCC
ASNS
DIM
5
6
FLTR2
GND
LM3445
www.ti.com
SNVS570M – JANUARY 2009 – REVISED NOVEMBER 2015
5 Pin Configuration and Functions
DGS Package
D Package
10-Pin VSSOP
14-Pin SOIC
Top View
Top View
Pin Functions
PIN
I/O
DESCRIPTION
NAME
SOIC
VSSOP
PWM output of the TRIAC dim decoder circuit. Outputs a 0 to 4-V PWM signal
ASNS
12
1
O
with a duty cycle proportional to the TRIAC dimmer on-time.
Bleeder pin. Provides the input signal to the angle detect circuitry as well as a
BLDR
10
10
I
current path through a switched 230-
Ω resistor to ensure proper firing of the
TRIAC dimmer.
OFF time setting pin. A user set current and capacitor connected from the
COFF
1
4
I
output to this pin sets the constant OFF time of the switching controller.
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
DIM
14
3
I/O
to the DIM pin of other LM3445s or other LED drivers to dim multiple LED
circuits simultaneously.
First filter input. The 120-Hz PWM signal from ASNS is filtered to a DC signal
and compared to a 1 to 3 V, 5.85-kHz ramp to generate a higher frequency
FLTR1
13
2
I
PWM signal with a duty cycle proportional to the TRIAC dimmer firing angle.
Pull above 4.9-V (typical) to tri-state DIM.
Second filter input. A capacitor tied to this pin filters the PWM dimming signal
FLTR2
3
5
I
to supply a DC voltage to control the LED current. Could also be used as an
analog dimming input.
Power MOSFET driver pin. This output provides the gate drive for the power
GATE
8
8
O
switching MOSFET of the buck controller.
GND
4
6
Circuit ground connection
LED current sense pin. Connect a resistor from main switching MOSFET
ISNS
7
7
I
source, ISNS to GND to set the maximum LED current.
N/C
2, 5, 6, 11
No Connect
Input voltage pin. This pin provides the power for the internal control circuitry
VCC
9
9
O
and gate driver.
Copyright © 2009–2015, Texas Instruments Incorporated
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