Datasheet > SEA05LTR

SEA05LTR

更新时间： 2024-02-09 13:15:20

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		/
页数	文件大小	规格书
12页	282K
描述
Advanced constant voltage and constant current controller with very efficient LED pilot-lamp driver

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中文翻译

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数据手册

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SEA05LTR 数据手册

SEA05L

Advanced constant voltage and constant current controller

with very efficient LED pilot-lamp driver

Preliminary data

Features

■ Constant voltage and constant current control

■ Very efficient LED pilot-lamp driver

■ Wide operating V range (3.5 V - 36 V)

SOT23-6L (plastic package)

■ Low quiescent consumption: 250 µA

■ Voltage reference: 2.5 V

Figure 1.

Block diagram

■ Voltage control loop accuracy 0.5%

■ Current sense threshold: 50 mV

■ Current control loop accuracy 4%

■ Low external component count

■ Open-drain output stage

2.5 V

1.23 V

O ut

Vctrl

50m V

■ SOT23-6L package

O SC

Applications

Isense

G ND

■ AC-DC adapter with LED pilot-lamp

■ Battery chargers with LED pilot-lamp

■ SMPS with LED pilot-lamp

The voltage reference, along with one op-amp, is

the core of the voltage control loop. The current

sensing circuit and the other op-amp make up the

current control loop.

The external components needed to complete the

two control loops are:

Description

The device is a highly integrated solution for

SMPS applications, with an LED pilot-lamp

requiring a dual control loop to perform CV

(constant voltage) and CC (constant current)

regulation.

- a resistor divider that senses the output of the

power supply and fixes the voltage regulation

setpoint at the specified value

- a sense resistor that feeds the current sensing

circuit with a voltage proportional to the DC output

current; this resistor determines the current

regulation setpoint and must be adequately rated

in terms of power dissipation

The IC allows very efficient LED pilot-lamp driving

which helps to reduce the standby consumption of

the SMPS. It integrates a voltage reference, two

op-amps (with OR-ed open-drain outputs), a low-

side current sensing circuit and an LED pilot-lamp

driver pin implemented with an open-drain mosfet

driven by square waveform with 12.5% duty cycle

at 1 kHz that allows reducing LED consumption.

- the frequency compensation components (R-C

networks) for both loops.

The device is ideal for space-critical applications.

Table 1.

Order code

SEA05LTR

Device summary

Package

Packing

SOT23-6L

Tape & reel

February 2011

Doc ID 18462 Rev 1

1/12

This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to

change without notice.

www.st.com

12 3 4 5 6 7...12

中文翻译

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与SEA05LTR相关器件

型号	品牌	获取价格	描述	数据表
SEA05TR	STMICROELECTRONICS	获取价格	Advanced constant voltage and constant current controller
SEA100M1VTR0507	SURGE	获取价格	Aluminum Electrolytic Capacitor, Polarized, Aluminum, 35V, 20% +Tol, 20% -Tol, 10uF,
SEA101M1ATR0607	SURGE	获取价格	Aluminum Electrolytic Capacitor, Polarized, Aluminum, 10V, 20% +Tol, 20% -Tol, 100uF,
SEA101M1C0607	SURGE	获取价格	Aluminum Electrolytic Capacitor, Polarized, Aluminum, 16V, 20% +Tol, 20% -Tol, 100uF,
SEA101M1ETA0807	SURGE	获取价格	CAP,AL2O3,100UF,25VDC,20% -TOL,20% +TOL
SEA101M1JSA1009	SURGE	获取价格	Aluminum Electrolytic Capacitor, Polarized, Aluminum, 63V, 20% +Tol, 20% -Tol, 100uF,
SEA102M0GCC0809	SURGE	获取价格	Aluminum Electrolytic Capacitor, Polarized, Aluminum, 4V, 20% +Tol, 20% -Tol, 1000uF,
SEA136	ETC	获取价格	Optoelectronic
SEA140	ETC	获取价格	Optoelectronic
SEA15010	CELDUC	获取价格	AC SOLID STATE INPUT MODULE

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