LM3842A 查看數據表（PDF） - HTC Korea
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LM3842A Datasheet PDF : 6 Pages
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CURRENT MODE PWM CONTROLLER
LM3842A/3A/4A/5A
ELECTRICAL CHARACTERISTIC
(Vcc=15V(Note 1), RT = 10kΩ, CT=3.3nF 0 ≤ TA ≤ 70℃ ; unless otherwise specified)
Characteristic
Symbol
Test Condition
Min Typ
REFERENCE SECTION
Reference Output Voltage
Line Regulation
VREF
Tj = 25℃, IO=1 mA
4.90 5.00
Vo
12V ≤ Vcc ≤ 25V
2
Load Regulation
Vo
1mA ≤ Io ≤ 20mA
3
Output Short Circuit Current
Isc
TA = 25℃
-85
OSCILLATOR SECTION
Normal Frequency
Voltage Stability
FOSC
Sv
Tj = 25℃
12V ≤ Vcc ≤ 25V
47 52
0.2
Amplitude
Vosc
1.6
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
IIB
VFB
AVOL
PSRREA
ISI
ISO
VOH
VOL
Vo=2.5V
2V≤ Vo ≤ 4V
12V ≤ Vcc ≤ 25V
VFB=2.7V, Vo - 1.1V
V = 2.3V, Vo=5V
VFB=2.7V, RL=15kΩ to GND
VFB=2.7V, RL=15kΩ to VRGR
2.42
65
60
2
-0.5
5
-0.1
2.50
90
70
7
-1.0
6
0.8
Input Voltage Gain
Av
(Note 2 & 3)
2.85 3
Maximum Input Signal
Power Supply Rejection Ratio
Input Bias Current
OUTPUT SECTION
VMAX
PSRRSC
IIB
Vo=5V (Note 2)
12V ≤ Vcc ≤ 25V
0.9 1
70
-3
Output Voltage Low
VOL
Output Voltage High
VOH
Rise Time
Tr
Fail Time
Tt
UNDERVOLTAGE LOCKOUT SECTION
Isink = 20mA
Isink = 20mA
Isource = 20mA
Isource = 20mA
Tj = 25℃, CL=1nF
Tj = 25℃, CL=1nF
0.1
1.5
13 13.5
12 13.0
45
35
Start Threshold
Vth
3842A/3844A
3843A/3845A
14.5 16
7.8 8.4
Minimum Operating Voltage (After Turn-on VCC(MIN)
3842A/3844A
3843A/3845A
8.5 10
7.0 7.6
PWM SECTION
Maximum Duty Cycle
Dmax
3842A/3843A
3844A/3845A
14.5 16
7.8 8.4
TOTAL STANDBY CURRENT
Start-up Current
Ist
Vcc=14V for 3842A/3844A
Vcc=6.5V for 3843A/3845A
0.17
0.17
Operating Supply Current
Zener Voltage
ICC
Vpin2=Vpin3=0V
14
Viz
Ii = 25mA
30 38
Max
5.10
20
25
-180
57
1
-2
2.58
1.1
3.15
1.1
-10
0.4
2.2
150
150
17.5
9
11.5
8.2
17.5
9
0.3
0.3
17
Unit
V
mV
mV
mA
kHz
%
Vp-p
μA
V
dB
dB
mA
mA
V
V
V/V
V
dB
μA
V
V
V
V
nS
nS
V
V
V
V
V
V
mA
mA
mA
V
−2−
HTC
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