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TYPICALCHARACTERISTICS
TableofGraphs
0
10
20
30
40
50
60
70
80
90
100
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 5.9 6.3
I
LED
= 25 毫安
V
I
− 输入 voltage − v
效率 − %
I
LED
= 15 毫安
I
LED
= 10 毫安
I
LED
= 5 毫安
0
10
20
30
40
50
60
70
80
90
100
2.7 3.1
3.5 3.9 4.3 4.7 5.1 5.5
5.9 6.3
V
I
− 输入 voltage − v
效率 − %
I
LED
= 25 毫安
I
LED
= 10 毫安
I
LED
= 15 毫安
I
LED
= 5 毫安
TPS60231
SLVS544–OCTOBER2004
图示
vsinputvoltage(i
LED
=25ma,15ma,10ma,5maperled),
1
en2=0,en1=1
vsinputvoltage(i
LED
=25ma,15ma,10ma,5maperled),en2=2
η
效率
1,en1=0
vsinputvoltage(i
LED
=25ma,15ma,10ma,5maperled),3
EN2=EN1=1
I
Q
quiescentcurrentvsinputvoltage(t
一个
=–40
°
c,25
°
c,85
°
c)(measuredwithi
D1
=5ma)4
Maximumoutputcurrentfromchargepump
vsinputvoltage(t
一个
=–40
°
c,25
°
c,85
°
c)5
平台
f
s
switchingfrequencyvsfree-airtemperature(t
一个
=-40
°
Cto85
°
c,v
I
=3.6v)6
vsdutycycleonpwm(i
LED
maxsetto20ma)7
ledcurrent,i
LED
forf=32khzandf=1khz,直流=1%to100%,v
I
=3.6v
V
I
andI
D1
vstimeonscope,ledcurrentatd1with8
Linetransientresponse
V
I
=4.2vto3.6vto4.2vwithen2=en1=11,3x20ma
pwmsignalandcurrentatd1vstimeonscope9,10
dimmingresponsef=32khzandf=1khz,v
I
=3.6v,dutycycle=50%,
EN1=EN2=PWM
V
I
=3.6v,3x20ma,en1=en2=00changedto11
Startuptiming
EN2=EN1=11
EFFICIENCYEFFICIENCY
vsvs
INPUTVOLTAGEINPUTVOLTAGE
figure1.figure2.
6
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