UC3842A Ver la hoja de datos (PDF) - Contek Microelectronics
Número de pieza
componentes Descripción
Fabricante
UC3842A Datasheet PDF : 6 Pages
| |||
UC3842A /3843A LINEARINTEGRATED CIRCUIT
CURRENT MODE PWM CONTROL
CIRCUITS
DESCRIPTION
The Contek UC3842A/3843A provide the necessary functions
to implement off-line or DC to DC fixed frequency current
mode , controlled switching circuits with a minimal external
part count
SOP-8
FEATURES
*Low external part count.
*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
BLOCK DIAGRAM
Vref
8
Internal
Bias
VFB
2
COMP 1
CURRENT SENSE 3
RT/CT 4
Contek
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
DIP-8
7 Vcc
5 GND
7 Vcc
6 OUTPUT
5 GND
ABSOLUTE MAXIMUM RATINGS(Ta=25 C)
PARAMETER
SYMBOL
Supply Voltage(Low Impedance Source)
VCC
Supply Voltage(Icc<30mA)
Vcc
Output Current ( Peak )
Io
Output Energy(capacity Load)
Analog Inputs(pin 2,3)
VI(ANA)
Error Amplifier Output Sink Current
ISINK(EA)
Power Dissipation
PD DIP-8
SOP-8
Lead Temperature( Soldering 10 Sec )
Tlead
VALUE
30
Self Limiting
+-1
5
-0.3 ~ +6.3
10
at Tamb<=25 C 1.0
at Tamb<=25 C 0.5
300
UNIT
V
V
A
mJ
V
mA
W
W
C
Contek Microelectronics Co.,Ltd.
1
CONTEK
http://www.contek-ic.com E-mail:sales@contek-ic.com
Share Link: 