產(chǎn)品說明:

ttp932 為高效率、恒流降壓直流對(duì)直流轉(zhuǎn)換器。僅需要外部4個(gè)零組件就可以為大功率的led照明一穩(wěn)定電流。ttp932的工作電壓可從5v到36v，而且可以透過調(diào)整外部感測(cè)電阻的阻值而使得輸出恒流達(dá)到1安培。ttp932的操作模式是採(cǎi)用遲滯pfm模式，可以提升效率達(dá)95%。調(diào)光部分，則是輸入pwm信號(hào)至dim pin進(jìn)行調(diào)光控制。除此之外，為確保整個(gè)系統(tǒng)的穩(wěn)定操作ttp932有內(nèi)建過溫保護(hù)機(jī)制及l(fā)ed開路與短路保護(hù)機(jī)制。

產(chǎn)品特點(diǎn)：

輸出恒流可達(dá)1安培

寬工作電壓范圍：5v~36v

內(nèi)建ndmos 功率開關(guān)

單pin 可控制/關(guān)及pwm調(diào)光

在輕載情況下，遲滯pfm操作模式可明顯提升效率

內(nèi)建過溫保護(hù)機(jī)制及l(fā)ed開路與短路保護(hù)機(jī)制

僅僅需要4個(gè)外部零組件

系統(tǒng)開關(guān)頻率可達(dá)1mhz

一般情況下，恒流精準(zhǔn)度可達(dá)輸出恒流的3%

產(chǎn)品應(yīng)用：

高功率led照明

車用led照明

led背光照明

恒流電流源

general description
ttp932 is a high efficiency , constant current , continuous mode inductive step-down converter,
designed for driving constant current to high power (single or multiple) led with only 4 external
components. ttp932 operates from input supply between 6v and 36v and provides an externally
adjustable output current of up to 1a.
the ttp932 is specifically designed with pfm control to enhance the efficiency up to 95% .
the output current can be modify by an external resister , and can adjusted , by applying an external
control signal to the dim pin , the dim pin will accept a pwm waveform.
additionally , to ensure the system reliability , ttp932 is built-in with over temperature
protection , and led open-circuit short-circuit protection to protect system from being damaged .
.features
? 1a output current
? wide input voltage range: 6v to 36v
? high efficiency (up to 95%)
? internal ndmos power switch
? single pin on/off and brightness control using pwm
? hysteretic pfm improves efficiency at light loads
? with thermal/soft start /led open-short detect protection
? only 4 external components
? up to 1mhz switching frequency
? typical 3% output current accuracy
.applications
z high power led lighting
z automotive led lighting
z low voltage industrial lighting
z led back-up lighting
z constant current source

詳情請(qǐng)來電咨詢，聯(lián)系人 劉 醒輝 先生15813881481

ttp111說明 

general description
the ttp111 is a touch detector ic for the dc led lightings with nmos application. the
dimmer function controls by pwm output. it has high frequency for pwm output.

features
operating voltage typical 5.0v
operating current @vdd=5.0v, 25? no load <500ua
higher frequency 4.8khz pwm output.
support two option pin to select 4 type dimmer modes.
(1). 3 steps dimmer initial off. opt2=0, opt1=1
(2). 4 steps dimmer initial off. opt2=1, opt1=0
(3). 3 steps dimmer initial on (6%). opt2=0, opt1=0
(4). toggle on / off initial off. opt2=1, opt1=1
ttp111 pwm output active high control nmos.
two input dimmer modes: touch plate and switch
the application circuit is simple and easy.
can use long wire to connect the ic to touch plate