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参数资料
| 型号： | LM3445-208277EV/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 2/40页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL LED DRIVER LM3445 |
| 标准包装： | 1 |
| 系列： | PowerWise® |
| 电流 - 输出 / 通道： | 500mA |
| 输出及类型： | 1，非隔离 |
| 特点： | 可调光，带标准型三端双向可控硅调光器，功率因数修正 |
| 输入电压： | 176 ~ 305 VAC |
| 已供物品： | 板 |
| 已用 IC / 零件： | LM3445 |
| 产品目录页面： | 1285 (CN2011-ZH PDF) |
| 其它名称： | LM3445-208277EV |
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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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| LM3445-230VFLBK/NOPB | 功能描述:LED 照明开发工具 LM3445-230VFLBK EVAL BOARD RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
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| LM3445-EDSNEV/NOPB | 功能描述:LED 照明开发工具 LM3445-EDSN EVAL BOARD RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
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