Datasheet > A80606

A80606

更新时间： 2022-06-24 15:42:43

品牌	Logo	应用领域
急速微 - ALLEGRO		/
页数	文件大小	规格书
41页	5340K
描述
High Power LED Driver with Pre-Emptive Boost

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数据手册

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A80606 数据手册

A80606 and

A80606-1

High Power LED Driver with Pre-Emptive Boost

for Ultra-High Dimming Ratio and Low Output Ripple

ꢍꢄUꢊ

ꢍ_SꢉNSꢉ

ꢍꢅRꢍ

Sꢘ

ꢉꢚternal

SꢗNꢇ

ꢇ_ꢅꢎꢊH

R_ꢀSꢉꢊ

R_ꢅꢎꢊH

ꢈ1

ꢏAꢊꢉ

ꢇ_ꢅRꢍ

ꢅꢎꢊH

ꢀSꢉꢊꢌSꢗNꢇ

ꢍꢎN

ꢄscillator

ꢏate ꢅriꢆer

ꢈꢅꢄ ꢑꢞ.5 ꢍꢓ

ꢇꢈꢝꢄUꢊ actiꢆe as

long as ꢉNꢠH

ꢀreꢟꢁency

dithering

ꢇꢈꢝꢄUꢊ

ꢇlocꢃ ꢄꢁt

ꢂꢁꢔꢔer

ꢏꢅRꢍ

NMꢄS

ꢏate

ꢅriꢆe

ꢉnaꢙle

ꢔ_Sꢘ

ꢂoost

ꢉnaꢙle

ꢇS

ꢇꢄMP

ꢇomꢋarator

R_ꢇS

PꢏNꢅ

ꢇꢄMP

PꢏNꢅ

ꢇꢁrrent

sense

Soꢔt Start

Ramꢋ

ꢇ_ꢇꢄMP

ꢍ_ꢈꢉꢅ

reꢔ

ꢑ

1ꢞ msꢓ

1 MHꢛ

ꢡꢒ

ꢈꢉꢅ1

ꢒ MHꢛ

Mꢁlti-inꢋꢁt

ꢉrror Amꢋ

ꢄꢇPꢐ

ꢊSꢅ

System

ꢍꢄUꢊ

oscillator

ꢀSꢉꢊ or ꢎSꢉꢊ

ꢋin ꢄꢋenꢌShort

ꢍꢅꢅ

ꢎnternal ꢍꢅꢅ

ꢑꢒ.ꢐ5 ꢍꢓ

ꢇ_ꢍꢅꢅ

R_ꢄꢍP

ꢍꢎN

ꢄꢍP

sense

Regꢁlator

Uꢍꢈꢄ ꢂlocꢃ

1.ꢐ35 ꢍ

Rꢉꢀ

ꢄꢍP

ꢍreꢔ

ꢀaꢁlt ꢂlocꢃ

ꢄꢋenꢌShort

ꢈꢉꢅ ꢅetect

AꢏNꢅ

R_SꢉNSꢉ

ꢉnaꢙle

ꢕ

ꢈꢉꢅ1

ꢈꢉꢅꢐ

ꢈꢉꢅ3

ꢎnꢋꢁt cꢁrrent

sense amꢋ

ꢍ

SꢉNSꢉ

ꢈꢉꢅ

ꢅriꢆer

ꢂlocꢃ

ꢇhoꢋꢋing

ꢔreꢟ ꢠ ꢒ MHꢛ

i_Aꢅꢖ

ꢍꢎN

ꢈꢉꢅꢒ

ꢈꢉꢅ5

ꢄnꢌꢄꢔꢔ

ꢏAꢊꢉ

ꢄꢀꢀ

ꢂoost

ꢉnaꢙle

ꢏAꢊꢉ

ꢉN

ꢇꢁrrent

leꢆel

ꢈꢉꢅꢞ

AꢅꢎM

PMꢄS

ꢅriꢆer

AꢏNꢅ

ꢇlocꢃ

detector

ꢉnaꢙle

ꢍreꢔ

100kΩ

ꢎnt ꢍꢅꢅ

ꢎSꢉꢊ

ꢝeeꢋ-Aliꢆe

ꢊimer

ꢎSꢉꢊ

ꢂlocꢃ

100 kΩ

1 MHꢛ

R_ꢎSꢉꢊ

ꢉꢚternal PꢘM

100 Hꢛ ꢜ ꢐ0 ꢝHꢛ

PꢘM

ꢍꢅꢅ

ꢉꢚternal

ꢀAUꢈꢊ

ꢈꢉꢅ ꢉnaꢙle

R_PU

start

Pre-ꢉmꢋtiꢆe

ꢂoost

100 kΩ

Pꢉꢂ

ꢀAUꢈꢊ

ꢎnternal ꢀAUꢈꢊ

delay

R_Pꢉꢂ

A80606

AꢏNꢅ

Figure 3: Functional Block Diagram

Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

1 2 345 6 7...41

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