ELM413 데이터 시트보기 (PDF) - Elm Electronics

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ELM413

LED Driver

Elm Electronics 

ELM413

Example Application

Figure 1 below shows the ELM413 used in a

typical speaker control and pilot lamp circuit for an

audio amplifier. In this instance, the majority of the

circuit components required are associated with

the relay that is used to block the speaker outputs

until the power has stabilized.

For this application, W0 and W1 are both tied

to a logic high level, so the warmup period is

selected to be 5 seconds. This is likely a good

choice for most circuits of this type, although some

may be able to use the 1 second setting.

The ELM413 has its trigger pin connected

directly to Vdd, causing the circuit to sequence

whenever the power is turned on. If the trigger

input should be connected to another voltage

source, keep in mind that a series resistor should

always be used. The resistor limits current flow

when either supply is at a different level than the

other. Typical values would be about 100KΩ, so

that the input current shown under the Electrical

Characteristics section is not exceeded.

Only one LED is used for this circuit, as a red

LED would never be lit in this instance. Other

applications may require that both red and green

LEDs be used, and the ELM413 adapts easily to

this as it has separate outputs for both. The

outputs can easily drive back to back two wire

LEDs as well as the common cathode three wire

types, and of course, discrete diodes. As the red

and green outputs are not active at the same time,

a single series current limiting resistor is usually all

that is required.

The circuit shown below causes the green

LED to flash for 5 seconds, followed by a steady

output. If one wanted a solid output without

flashing, the LED could have been connected

directly to VDD, or it could have been connected

from VDD to pin 7 of the ELM413 (with a series

resistor). The latter case would likely be needed

for circuits that are retriggered using pin 5, without

the power being cycled.

The ELM413 is a simple yet versatile circuit

that is convenient and easy to use. Other uses

would include generating pulses from a trigger

input, or connecting several in series to generate

sequential events…

270Ω

Green

LED

8765

413

+5V

1234

0.1µF

1N4001

+12V

12V Relay

2.2KΩ

2N3904

L

R

Speaker

Enable

ELM413DSA

Figure 1. Typical Speaker Control Circuit

Elm Electronics – Circuits for the Hobbyist

< http://www.elmelectronics.com/ >

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