http://www.datasheet4u.com

900,000+ Datasheet PDF Search and Download

Datasheet4U offers most rated semiconductors datasheets pdf


UTC
UTC

UC3843A Datasheet

(UC3842A / UC3843A) CURRENT MODE PWM CONTROL CIRCUITS


UC3843A Datasheet Preview


www.DataSheet4U.com
UNISONIC TECHNOLOGIES CO., LTD
UC3842A/3843A
LINEAR INTEGRATED CIRCUIT
CURRENT MODE PWM
CONTROL CIRCUITS
DESCRIPTION
The UTC UC3842A/3843A provide the necessary functions to
implement off-line or DC to DC fixed frequency current mode ,
controlled switching circuits with minimal external components.
SOP -8
FEATURES
*Low start up current ( Typical 0.12mA )
*Automatic feed forward compensation
*Pulse-by-Pulse current limiting
*Under-voltage lockout with hysteresis
*Double pulse Suppression
*High current totem pole output to drive MOSFET directly
*Internally trimmed band gap reference
*500kHz operation
ORDERING INFORMATION
Ordering Number
Normal
Lead Free Plating
UC3842A-D08-T
UC3842AL-D08-T
UC3842A-S08-R
UC3842AL-S08-R
UC3842A-S08-T
UC3842AL-S08-T
UC3843A-D08-T
UC3843AL-D08-T
UC3843A-S08-R
UC3843AL-S08-R
UC3843A-S08-T
UC3843AL-S08-T
Package
DIP-8
SOP-8
SOP-8
DIP-8
SOP-8
SOP-8
DIP-8
*Pb-free plating product number: UC3842AL
UC3843AL
Packing
Tube
Tape Reel
Tube
Tube
Tape Reel
Tube
UC3842AL-D08-T
(1)Packing Type
(2)Package Type
(3)Lead Plating
(1) T: Tube, R: Tape Reel
(2) D08: DIP-8, S08: SOP-8
(3) L: Lead Free Plating, Blank: Pb/Sn
www.unisonic.com.tw
Copyright © 2005 Unisonic Technologies Co., Ltd
1 of 9
QW-R103-002,D
Page 1

UC3842A/3843A
PIN CONFIGURATION
COMP 1
VFB 2
Current Sense 3
RT/CT 4
LINEAR INTEGRATED CIRCUIT
8 VREF
7 VCC
6 Output
5 GND
BLOCK DIAGRAM
VREF
8
Internal
Bias
VFB 2
COMP 1
CURRENT SENSE 3
RT/CT 4
1/2VREF
ERROR
AMPLIFIER
5V REF
S/R
VREF
Good
Logic
1/ 3VREF
U.V.L.O
CURRENT
SENSE
COMPARATOR
1V R
PWM
LATCH
S
OSCILLATOR
7 Vcc
5 GND
7 Vcc
6 OUTPUT
5 GND
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 9
QW-R103-002,D
Page 2

UC3842A/3843A
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS (Ta=25 )
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage(Low Impedance Source)
VCC 30 V
Supply Voltage(ICC<30mA)
Output Current ( Peak )
Output Energy (capacity Load)
VCC
IO(PEAK)
Self Limiting
1
5
V
A
µJ
Analog Inputs(pin 2,3)
VI(ANA)
-0.3 ~ +6.3
V
Error Amplifier Output Sink Current
ISINK(EA)
10 mA
Power Dissipation( Ta 25°C)
DIP-8
SOP-8
PD
1.0 W
0.5 W
Derated at Ta>25°C
Junction Temperature
Storage Temperature
PD
TJ
TSTG
8
+150
-65 ~ +150
mW/°C
°C
°C
Note Absolute maximum ratings are those values beyond which the device which the device could be permanently
damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied.
ELECTRICAL CHARACTERISTICS
(0°C T 70°C, VCC=15V, RT=10k, CT=3.3nF, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
Reference Section
Output Voltage
Line Regulation
Load Regulation
VREF
VREF
VREF
TJ=25°C,IOUT=1mA
12 VIN25V
1 IOUT=20mA
Temperature Stability
(Note 1)
Total Output Variation
Line, Load, Temp(Note 1)
Output Noise Voltage
Vosc 10Hz f 10kHz,TJ=25°C (Note 1)
Long Term Stability
Ta=25°C,1000Hrs(Note 1)
Output Short Circuit
ISC
Oscillator Section
Initial Accuracy
Voltage Stability
f TJ=25°C
f/Vcc 12 VCC 25V
Temperature Stability
Tmin Ta Tmax(Note 1)
Amplitude
Vosc Vpin 4 peak to peak
Error Amplifier Section
Input Voltage
VI(EA) Vpin 1=2.5V
Input Bias Current
AVOL
II(BIAS)
2 VOUT 4V
Unity Gain Bandwidth
PSRR
TJ=25°C (Note 1)
I2 VCC 25V
Output Sink Current
IO(SINK) Vpin 2=2.7V,Vpin 1=1.1V
Output Source Current
VOUT High
IO(SOURCE) Vpin 2=2.3V,Vpin 1=5V
VOH Vpin 2=2.3V, RL=15kto GND
VOUT Low
VOL Vpin 2=2.7V,Vpin 1=1.1V
MIN TYP MAX UNIT
4.9 5 5.1 V
6 20 mV
6 25 mV
0.2 0.4 mV/°C
4.82 5.18 V
50 µV
5 25 mV
-30 -100 -180 mA
47 52 57 kHz
0.2 1
%
5%
1.7 V
2.42 2.50 2.58 V
-0.3 -2 µA
60 90
dB
0.7 1
MHz
60 70
dB
26
mA
-0.5 -0.8
mA
56
V
0.7 1.1 V
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
3 of 9
QW-R103-002,D
Page 3
Part Number UC3843A
Manufactur UTC
Description (UC3842A / UC3843A) CURRENT MODE PWM CONTROL CIRCUITS
Total Page 9 Pages
PDF Download
UC3843A datasheet
Download PDF File
UC3843A datasheet
View Html for PC & Mobile


Related Datasheet

UC3843 , UC3843 , UC3843 , UC3843 , UC3843 , UC3843 , UC3843A , UC3843A , UC3843A , UC3843A , UC3843A , UC3843A , UC3843A , UC3843A , UC3843A , UC3843B , UC3843B , UC3843B , UC3843B , UC3843B , UC3843D , UC3843D , UC3843D , UC3843D1 , UC3843N , UC3843P , UC3843P , UC3843T , UC3843Y ,

site map

webmaste! click here

contact us

Buy Components