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LM3842A Datasheet(PDF) 2 Page - HTC Korea TAEJIN Technology Co.

Part No. LM3842A
Description  CURRENT MODE PWM CONTROLLER
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Maker  HTC [HTC Korea TAEJIN Technology Co.]
Homepage  http://www.htckorea.co.kr
Logo HTC - HTC Korea TAEJIN Technology Co.

LM3842A Datasheet(HTML) 2 Page - HTC Korea TAEJIN Technology Co.

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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
Max
Unit
REFERENCE SECTION
Reference Output Voltage
VREF
Tj = 25℃, IO=1 mA
4.90
5.00
5.10
V
Line Regulation
Vo
12V ≤ Vcc ≤ 25V
2
20
mV
Load Regulation
Vo
1mA ≤ Io ≤ 20mA
3
2.5
mV
Output Short Circuit Current
Isc
TA = 25℃
-85
-180
mA
OSCILLATOR SECTION
Normal Frequency
FOSC
Tj = 25℃
47
52
57
kHz
Voltage Stability
Sv
12V ≤ Vcc ≤ 25V
0.2
1
%
Amplitude
Vosc
1.6
Vp-p
ERROR AMPLIFIER SECTION
Input B
Current
I B
I
-0.1
-2
μA
Feedback Input Voltage
VFB
Vo=2.5V
2.42
2.50
2.58
V
Open Loop Voltage Gain
AVOL
2V≤ Vo ≤ 4V
65
90
dB
Power Supplier Rejection Ratio
PSRREA
12V ≤ Vcc ≤ 25V
60
70
dB
Output Sink Current
ISI
VFB=2.7V, Vo - 1.1V
27
mA
Output source Current
ISO
V
= 2.3V, Vo=5V
-0.5
-1.0
mA
Output Voltage High
VOH
VFB=2.7V, RL=15kΩ to GND
56
V
Output Voltage Low
VOL
VFB=2.7V, RL=15kΩ to VRGR
0.8
1.1
V
CURRENT SENSE SECTION
Input Voltage Gain
Av
(Note 2 & 3)
2.85
3
3.15
V/V
Maximum Input Signal
VMAX
Vo=5V (Note 2)
0.9
1
1.1
V
Power Supply Rejection Ratio
PSRRSC
12V ≤ Vcc ≤ 25V
70
dB
Input Bias Current
I B
I
-2
-1.0
μA
OUTPUT SECTION
Output Voltage Low
VOL
Isink = 20mA
0.1
0.4
V
I ink
s
= 20mA
1.5
2.2
V
Output Voltage High
VOH
Isource = 20mA
13
13.5
V
I ource
s
= 20mA
12
13.0
V
Rise Time
T
Tj = 25℃, CL=1nF
45
150
nS
Fail Time
T
Tj = 25℃, CL=1nF
35
150
nS
UNDERVOLTAGE LOCKOUT SECTION
Start-up Threshold
Vth
3842A / 3844A
14.5
16
17.5
V
3843A / 3845A
7.8
8.4
9
V
Minimum Operating Voltage
VCC(MIN)
3842A / 3844A
8.5
10
11.5
V
(After Turn-On )
3843A / 3845A
7.0
7.6
8.2
V
TOTAL STANDBY CURRENT
Start-up Current
I ts
Vcc=14V
0.17
0.3
mA
Operating Supply Current
I C
C
13
mA
17
Zener Voltage
V
Icc = 25mA
30
38
V
Note: 1. Adjust Vcc above the start threshould before setting at 15V.
2. Parameter measured at trip point of latch with VFB - 0.
3. Comparator Gain defined as:
HTC
2
ΔV Output Compensation(pin FB)
ΔV Current Sanseinput(pin CS)
A
V
=
;


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