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參數(shù)資料
| 型號(hào)： | LM3842A |
| 廠商： | TAEJIN Technology Co., Ltd. |
| 英文描述： | CURRENT MODE PWM CONTROLLER |
| 中文描述： | 電流模式PWM控制器 |
| 文件頁(yè)數(shù)： | 2/7頁(yè) |
| 文件大?。?/td> | 121K |
| 代理商： | LM3842A |
CURRENT MODE PWM CONTROLLER
LM3842A/3A/4A/5A
ELECTRICAL CHARACTERISTIC
(Vcc=15V(Note 1), R
T
= 10kΩ, C
T
=3.3nF 0 ≤ T
A
≤ 70℃ ; unless otherwise specified)
Characteristic
Symbol
Test Condition
Min
Typ
Max
Unit
REFERENCE SECTION
Reference Output Voltage
Line Regulation
Load Regulation
Output Short Circuit Current
OSCILLATOR SECTION
Normal Frequency
Voltage Stability
Amplitude
ERROR AMPLIFIER SECTION
Input B Current
Feedback Input Voltage
Open Loop Voltage Gain
Power Supplier Rejection Ratio
Output Sink Current
Output source Current
Output Voltage High
Output Voltage Low
CURRENT SENSE SECTION
Input Voltage Gain
Maximum Input Signal
Power Supply Rejection Ratio
Input Bias Current
OUTPUT SECTION
Output Voltage Low
V
REF
Vo
Vo
Isc
T
j
= 25℃, I
O
=1 mA
12V ≤ Vcc ≤ 25V
1mA ≤ Io ≤ 20mA
T
A
= 25℃
4.90
5.00
2
3
-85
5.10
20
2.5
-180
V
mV
mV
mA
F
OSC
Sv
Vosc
T
j
= 25℃
12V ≤ Vcc ≤ 25V
47
52
0.2
1.6
57
1
kHz
%
Vp-p
I
B
I
V
FB
A
VOL
PSRR
EA
I
SI
I
SO
V
OH
V
OL
-0.1
2.50
90
70
7
-1.0
6
0.8
-2
2.58
μA
V
dB
dB
mA
mA
V
V
Vo=2.5V
2V≤ Vo ≤ 4V
12V ≤ Vcc ≤ 25V
V
FB
=2.7V, Vo - 1.1V
V = 2.3V, Vo=5V
V
FB
=2.7V, R
L
=15kΩ to GND
V
FB
=2.7V, R
L
=15kΩ to V
RGR
2.42
65
60
2
-0.5
5
1.1
Av
V
MAX
PSRR
SC
I
B
I
(Note 2 & 3)
Vo=5V (Note 2)
12V ≤ Vcc ≤ 25V
2.85
0.9
3
1
70
-2
3.15
1.1
V/V
V
dB
μA
-1.0
V
OL
I
sink
= 20mA
I
ink
s
= 20mA
I
source
= 20mA
I
ource
s
= 20mA
T
j
= 25℃, C
L
=1nF
T
j
= 25℃, C
L
=1nF
0.1
1.5
13.5
13.0
45
35
0.4
2.2
V
V
V
V
Output Voltage High
V
OH
13
12
Rise Time
Fail Time
UNDERVOLTAGE LOCKOUT SECTION
Start-up Threshold
T
T
150
150
nS
nS
V
th
3842A / 3844A
3843A / 3845A
3842A / 3844A
3843A / 3845A
14.5
7.8
8.5
7.0
16
8.4
10
7.6
17.5
9
11.5
8.2
V
V
V
V
Minimum Operating Voltage
(After Turn-On )
TOTAL STANDBY CURRENT
Start-up Current
Operating Supply Current
Zener Voltage
V
CC(MIN)
I
t
I
C
C
V
Vcc=14V
0.17
13
38
0.3
17
mA
mA
V
Icc = 25mA
30
Note: 1. Adjust Vcc above the start threshould before setting at 15V.
2. Parameter measured at trip point of latch with V
FB
- 0.
3. Comparator Gain defined as:
HTC
2
ΔV Output Compensation(pin FB)
ΔV Current Sanseinput(pin CS)
A
V
=
;
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