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| 型号： | LM3445MX/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 2/40页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER TRIAC DIMM 14SOIC |
| 标准包装： | 2,500 |
| 系列： | PowerWise® |
| 恒定电流： | 是 |
| 拓扑： | PWM，降压（降压） |
| 输出数： | 1 |
| 内部驱动器： | 无 |
| 类型 - 次要： | 高亮度 LED（HBLED） |
| 频率： | 30kHz ~ 1MHz |
| 电源电压： | 8 V ~ 12 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 14-SOICN |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 125°C |
| 其它名称： | LM3445MX |
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SNVS570L – JANUARY 2009 – REVISED MAY 2013
ORDER NUMBER (1)
LM3445M/NOPB
LM3445MM/NOPB
LM3445MMX/NOPB
LM3445MX/NOPB
DEVICE INFORMATION
TOP MARK
SULB
SULB
LM3445M
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 www.ti.com .
Connection Diagram
Top View
Top View
ASNS
FLTR1
DIM
COFF
FLTR2
1
2
3
4
5
10 BLDR
9 V CC
8 GATE
7 I SNS
6 GND
COFF
N/C
FLTR2
GND
N/C
1
2
3
4
5
14 DIM
13 FLTR1
12 ASNS
11 N/C
10 BLDR
N/C
ISNS
6
7
9 VCC
8 GATE
Figure 1. 10-Pin VSSOP
Package Number DGS
PIN DESCRIPTIONS
Figure 2. 14-Pin SOIC
Package Number D
SOIC
12
VSSOP
1
Name
ASNS
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.
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
7
6
7
GND
ISNS
Circuit ground connection.
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
10
9
10
V CC
BLDR
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 230 ? resistor to ensure proper firing of the triac dimmer.
2,5,6,11
-
N/C
No Connect
2
Product Folder Links: LM3445
Copyright ? 2009–2013, Texas Instruments Incorporated
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