CURRENT MODE PWM CONTROLLER
ELECTRICAL CHARACTERISTIC
LM3842A/3A/4A/5A
(Vcc=15V(Note 1), R
T
= 10kΩ, C
T
=3.3nF 0 ≤ T
A
≤ 70℃ ; unless otherwise specified)
Characteristic
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
Output Voltage High
Rise Time
Fail Time
UNDERVOLTAGE LOCKOUT SECTION
Start-up Threshold
Minimum Operating Voltage
(After Turn-On )
TOTAL STANDBY CURRENT
Start-up Current
Operating Supply Current
Zener Voltage
Symbol
V
REF
Vo
Vo
Isc
F
OSC
Sv
Vosc
I
IB
V
FB
A
VOL
PSRR
EA
I
SI
I
SO
V
OH
V
OL
Av
V
MAX
PSRR
SC
I
IB
V
OL
V
OH
T
T
V
th
V
CC(MIN)
I
st
I
CC
V
Test Condition
T
j
= 25℃, I
O
=1 mA
12V ≤ Vcc ≤ 25V
1mA ≤ Io ≤ 20mA
T
A
= 25℃
T
j
= 25℃
12V ≤ Vcc ≤ 25V
Min
4.90
Typ
5.00
2
3
-85
52
0.2
1.6
-0.1
2.50
90
70
Max
5.10
20
2.5
-180
57
1
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
mA
mA
V
47
Vo=2.5V
2.42
2V≤ Vo ≤ 4V
65
60
12V ≤ Vcc ≤ 25V
V
FB
=2.7V, Vo - 1.1V
2
V = 2.3V, Vo=5V
-0.5
V
FB
=2.7V, R
L
=15kΩ to GND
5
V
FB
=2.7V, R
L
=15kΩ to V
RGR
(Note 2 & 3)
Vo=5V (Note 2)
12V ≤ Vcc ≤ 25V
2.85
0.9
-2
2.58
7
-1.0
6
0.8
3
1
70
-2
0.1
1.5
13.5
13.0
45
35
16
8.4
10
7.6
0.17
13
38
1.1
3.15
1.1
-1.0
0.4
2.2
I
sink
= 20mA
I
sink
= 20mA
I
source
= 20mA
I
source
= 20mA
T
j
= 25℃, C
L
=1nF
T
j
= 25℃, C
L
=1nF
3842A
3843A
3842A
3843A
/
/
/
/
3844A
3845A
3844A
3845A
13
12
150
150
17.5
9
11.5
8.2
0.3
17
14.5
7.8
8.5
7.0
Vcc=14V
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:
A
V
=
ΔV Output Compensation(pin FB)
;
ΔV Current Sanseinput(pin CS)
HTC
2
HTC [ HTC KOREA TAEJIN TECHNOLOGY CO. ]
