Texas Instruments LM3445 Evaluation Board LM3445-230VFLBK/NOPB LM3445-230VFLBK/NOPB 데이터 시트
제품 코드
LM3445-230VFLBK/NOPB
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
I
SNS
FLTR1
GATE
BLDR
COFF
V
CC
ASNS
DIM
5
6
FLTR2
GND
SNVS570L – JANUARY 2009 – REVISED MAY 2013
DEVICE INFORMATION
ORDER NUMBER
(1)
TOP MARK
LM3445M/NOPB
SULB
LM3445MM/NOPB
SULB
LM3445MMX/NOPB
LM3445M
LM3445MX/NOPB
LM3445M
(1)
For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at
web site at
Connection Diagram
Top View
Top View
Figure 1. 10-Pin VSSOP
Figure 2. 14-Pin SOIC
Package Number DGS
Package Number D
PIN DESCRIPTIONS
SOIC
VSSOP
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.
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.
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.
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.
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.
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.
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.
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
switched 230
Ω
resistor to ensure proper firing of the triac dimmer.
2,5,6,11
-
N/C
No Connect
2
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