LM3445-208277EV/NOPB National Semiconductor, LM3445-208277EV/NOPB Datasheet - Page 2

• Manufacturer Part Number: LM3445-208277EV/NOPB
• Description: BOARD EVAL LED DRIVER LM3445
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM3445-208277EV/NOPB

• Current - Output / Channel: 500mA
• Outputs And Type: 1, Non-Isolated
• Features: Dimmable with Standard TRIAC Dimmer, Power Factor Correction
• Voltage - Input: 176 ~ 305 VAC
• Utilized Ic / Part: LM3445
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Other names: LM3445-208277EV

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Order Number
2,5,6,11
Connection Diagrams
Ordering Information
LM3445MMX
Pin Descriptions
SOIC
LM3445MM
LM3445MX
LM3445M
12
13
14
10
1
3
4
7
8
9
MSOP
10
1
2
3
4
5
6
7
8
9
-
NS Package Number MUB10A
NOPB
NOPB
NOPB
NOPB
Spec.
FLTR1
FLTR2
Name
ASNS
COFF
GATE
BLDR
ISNS
GND
10-Pin MSOP
DIM
V
N/C
CC
Top View
Package Type
SOIC-14L
SOIC-14L
MSOP-10
MSOP-10
Description
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.
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.
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.
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.
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.
Circuit ground connection.
LED current sense pin. Connect a resistor from main switching MOSFET source, ISNS to GND to
set the maximum LED current.
Power MOSFET driver pin. This output provides the gate drive for the power switching MOSFET
of the buck controller.
Input voltage pin. This pin provides the power for the internal control circuitry and gate driver.
Bleeder pin. Provides the input signal to the angle detect circuitry as well as a current path through
a switched 230Ω resistor to ensure proper firing of the triac dimmer.
No Connect
30060303
NSC Package
MUB10A
MUB10A
Drawing
M14A
M14A
2
Top Mark
LM3445M
LM3445M
SULB
SULB
1000 Units, Tape and Reel
3500 Units, Tape and Reel
55 Units, Rail
2500 Units, Tape and Reel
NS Package Number M14A
14-Pin SOIC
Top View
Supplied As
30060373