www.德州仪器.com
V
OUT2
V
OUT1
I
OUT1
2 mv/div
100 mv/div
200 毫安/div
20
µ
s/div
250 毫安
10 毫安
C
OUT2
= 10
µ
F
C
OUT1
= 10
µ
F
60
50
40
30
20
10
0
频道 分开 (db)
0.1 1 10 100 1k
频率 (hz)
C
OUT1
= C
OUT2
= 10
µ
F
I
OUT1
= 0 毫安 至 500 毫安 Sinusoidal 加载
I
OUT2
= 25 毫安
20 mv/div
1 v/div
V
OUT2
V
OUT1
V
EN1
50
µ
s/div
C
NR
= 0.001
µ
F
C
NR
= 0.01
µ
F
I
OUT1
= I
OUT2
= 250 毫安
C
OUT1
= C
输出 2
= 10
µ
F
1 v/div
50 ms/div
V
在
V
OUT1
V
OUT2
I
OUT1
= I
OUT2
= 250 毫安
250
200
150
100
50
0
总的 噪音 (
µ
电压有效值)
1 10 100 1k 10k 100k
C
NR
(pf)
C
输出
= 2.2
µ
F
I
输出
= 250 毫安
C
输出
= 10
µ
F
I
输出
= 250 毫安
C
输出
= 2.2
µ
F
I
输出
= 0 毫安
C
输出
= 10
µ
F
I
输出
= 0 毫安
V
输出
= 2.8 V
350
300
250
200
150
100
50
0
100 1k 10k 100k
频率 (hz)
谱的 噪音 密度 (nv/
√
hz)
I
输出
= 250 毫安
C
NR
= 0.1
µ
F
V
输出
= 2.8 V
I
输出
= 1 毫安
tps71202,tps71219
tps71229,tps71247
tps71256,tps71257
SBVS049C–MAY2004–REVISEDJULY2005
typicalcharacteristics(持续)
ForallvoltageversionsatT
J
=25°c,v
在
=V
输出(nom)
+1v,i
输出
=1ma,v
EN
=1.2v,c
输出
=2.2µf,andc
NR
=0.01µf,
unlessotherwisenoted.
TPS71256TPS71256
loadtransientresponsechannel-至-channelisolationvsfrequency
ANDV
OUT2
串扰
figure13.figure14.
TPS71256TPS71229
转变-在/offresponsepower-向上/电源-向下
ANDV
OUT2
串扰
figure15.figure16.
TOTALNOISEvsC
NR
NOISESPECTRALDENSITY
C
输出
=2.2µf
figure17.figure18.
7
: 点此下载
