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參數(shù)資料
| 型號： | AS2840AU |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 5/20頁 |
| 文件大?。?/td> | 94K |
| 代理商： | AS2840AU |
ASTEC Semiconductor
Current Mode Controller
AS2842/3/4/5
41
Electrical Characteristics
(cont’d)
Electrical characteristics are guaranteed over full junction temperature range (-40 to 105
°
C ). Ambient temperature must be derated based
on power dissipation and package thermal characteristics. The conditions are: V
CC
= 15 V R
T
= 10 k
,
and C
T
= 3.3 nF, unless otherwise stated.
To override UVLO, V
CC
should be raised above 17 V prior to test.
Parameter
Error Amplifier
Symbol
Test Condition
Min
Typ
Max
Unit
Input Voltage
V
FB
T
J
= 25
°
C
2.475
2.50
2.525
V
Input Bias Current
I
BIAS
–0.1
–1
μ
A
Voltage Gain
A
VOL
2
≤
V
COMP
≤
4 V
65
90
dB
Transconductance
G
m
1
mA/mV
Unity Gain Bandwidth
1
GBW
0.8
1.2
MHz
Power Supply Rejection Ratio
PSRR
12
≤
V
CC
≤
25 V
60
70
dB
Output Sink Current
I
COMPL
V
FB
= 2.7 V, V
COMP
= 1.1V
2
6
mA
Output Source Current
I
COMPH
V
FB
= 2.3 V, V
COMP
= 5 V
0.5
0.8
mA
Output Swing High
V
COMPH
V
FB
= 2.3 V, R
L
= 15 k
to Ground
5
5.5
V
Output Swing Low
V
COMPL
V
FB
= 2.7 V, R
L
= 15 k
to Pin 8
0.7
1.1
V
Current Sense Comparator
Transfer Gain
2,3
AV
CS
–0.2
≤
V
SENSE
≤
0.8 V
2.85
3.0
3.15
V/V
I
SENSE
Level Shift
2
V
LS
V
SENSE
= 0 V
1.5
V
Maximum Input Signal
2
V
COMP
= 5 V
0.9
1
1.1
V
Power Supply Rejection Ratio
PSRR
12
≤
V
CC
≤
25 V
70
dB
Input Bias Current
I
BIAS
–1
–10
μ
A
Propagation Delay to Output
1
t
PD
85
150
ns
Output
Output Low Level
V
OL
I
SINK
= 20 mA
0.1
0.4
V
V
OL
I
SINK
= 200 mA
1.5
2.2
V
Output High Level
V
OH
I
SOURCE
= 20mA
13
13.5
V
V
OH
I
SOURCE
= 200mA
12
13.5
V
Rise Time
1
t
R
C
L
= 1 nF
50
150
ns
Fall Time
1
t
F
C
L
= 1 nF
50
150
ns
Housekeeping
Start-up Threshold
V
CC
(on)
2842/4
15
16
17
V
2843/5
7.8
8.4
9.0
V
Minimum Operating Voltage
V
CC
(min)
2842/4
9
10
11
V
After Turn On
2843/5
7.0
7.6
8.2
V
Output Low Level in UV State
V
OUV
I
SINK
= 20 mA, V
CC
= 6 V
1.5
2.0
V
Over-Temperature Shutdown
4
T
OT
125
°
C
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