Datasheet 搜索 > 音频放大器 > TI（德州仪器） > LM4940TSX/NOPB 数据手册 > LM4940TSX/NOPB 其他数据使用手册 3/22 页
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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
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
引脚图在P2Hot
典型应用电路图在P1
原理图在P9
封装尺寸在P2P21
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
应用领域在P1
电气规格在P3P4P6P7
导航目录
LM4940TSX/NOPB数据手册
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LM3423 LM3421 Name Function
10 - TIMR
Fault Timer: The fault timer is comprised of an external capacitor, an internal charging current
source, an internal discharge N-channel MOSFET, and a comparator that latches the fault
condition when the threshold voltage (1.24V) is exceeded.
11 - LRDY
LED Ready status flag: This is an N-channel MOSFET open drain output which pulls down
whenever the LED current is not in regulation.
12 - DPOL
Dim Polarity: Selects the polarity of the DIM driver output. Tie to V
CC
or leave open for low
side dimming, tie to ground for high side dimming.
13 9 DDRV External Dimming MOSFET Gate Drive: Gate driver output responding to nDIM input.
14 10 PGND
Power Ground: GATE and DDRV gate drive ground current return pin. This pin should be
connected via the circuit board to the AGND pin through the EP copper circuit board pad.
15 11 GATE Main switching MOSFET gate drive output.
16 12
V
CC
Internal Regulator Bypass: 6.9V low dropout linear regulator output. Bypass with a 2.2µF–
3.3µF, ceramic type capacitor to PGND.
17 13 IS
Main Switch Current Sense input: This pin is used for current mode control and cycle-by-cycle
current limit. This pin can be tied to the drain of the main N-channel MOSFET switch for
R
DS(ON)
sensing or tied to a sense resistor installed in the source of the same device.
18 14 RPD
Resistor Pull-Down: This is an open drain N-channel MOSFET which is used to pull-down the
low side of all external resistor dividers (V
IN
UVLO, OVP). This pin allows for system “zero-
current” shutdown.
19 15 HSP
High Side Sense Positive: LED current sense positive input. An external resistor sets a
reference current flowing into this pin from the programmed high-side sense voltage. Although
the current into this pin can be set to values ranging from 10µA through 1mA, a value of 100µA
is recommended. This pin is a virtual ground whose potential is set by the voltage on the HSN
pin.
20 16 HSN
High Side Sense Negative: This pin sets the reference voltage for the HSP input. An external
resistor of the same value as that used on the HSP pin should be connected from this pin to
the negative side of the current sense resistor.
EP (21) EP (17) EP
EP: Star ground, connecting AGND and PGND. For thermal considerations please refer to
(Note 4) of the Electrical Characteristics table.
3 www.national.com
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