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LM4940TSX/NOPB 其他数据使用手册 - TI（德州仪器）
制造商:
TI（德州仪器）
分类:
音频放大器
封装:
TO-263-9
描述:
6W立体声音频功率放大器 6W Stereo Audio Power Amplifier
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型号编码规则在P2P21
封装信息在P2
功能描述在P1P10
技术参数、封装参数在P4P6
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LM4940TSX/NOPB数据手册
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July 31, 2008
LM3421, LM3423
N-Channel Controllers for Constant Current LED Drivers
General Description
The LM3421/LM3423 devices are versatile high voltage LED
driver controllers. With the capability to be configured in a
Buck, Boost, Buck-Boost (Flyback), or SEPIC topology, and
an input operating voltage rating of 75V, these controllers are
ideal for illuminating LEDs in a very diverse, large family of
applications.
Adjustable high-side current sense with a typical sense volt-
age of 100mV allows for tight regulation of the LED current
with the highest efficiency possible. Output LED current reg-
ulation is based on peak current-mode control with predictive
Off-Time Control. This method of control eases the design of
loop compensation while providing inherent input voltage
feed-forward compensation.
The LM3421/LM3423 include a high-voltage startup regulator
that operates over a wide input range of 4.5V to 75V. The
internal PWM controller is designed for adjustable switching
frequencies of up to 2.0MHz, thus enabling compact solu-
tions. Additional features include: “zero” current shutdown,
precision reference, logic compatible DIM input suitable for
fast PWM dimming, cycle-by-cycle current limit, and thermal
shutdown.
The LM3423 also includes an LED output status flag, a fault
flag, a programmable fault timer, and a logic input to select
the polarity of the dimming output driver.
Features
■
V
IN
range from 4.5V to 75V
■
2% Internal reference voltage (1.235V)
■
Current sense voltage adjustable from 20mV
■
High-side current sensing
■
2Ω MOSFET gate driver
■
Dimming MOSFET gate driver
■
Input under-voltage protection
■
Over-voltage protection
■
Low shutdown current, I
Q
< 1µA
■
Fast (50kHz) PWM dimming
■
Cycle-by-cycle current limit
■
Programmable switching frequency
■
LED output status flag (LM3423 only)
■
Fault timer pin (LM3423 only)
■
TSSOP EP 16-lead package (LM3421)
■
TSSOP EP 20-lead package (LM3423)
Applications
■
LED Drivers
■
Constant-Current Buck-Boost Regulator
■
Constant-Current Boost Regulator
■
Constant-Current Flyback Regulator
■
Constant-Current SEPIC Regulator
■
Thermo-Electric Cooler (Peltier) Driver
Typical Application Circuit
30067331
Boost LED Driver
© 2008 National Semiconductor Corporation 300673 www.national.com
LM3421, LM3423 N-Channel Controllers for Constant Current LED Drivers
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