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UTCUC3843A fiches techniques PDF

Unisonic Technologies - CURRENT MODE PWM CONTROL CIRCUITS

Numéro de référence UTCUC3843A
Description CURRENT MODE PWM CONTROL CIRCUITS
Fabricant Unisonic Technologies 
Logo Unisonic Technologies 





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UTCUC3843A fiche technique
UTCUC3842A/3843A LINEARINTEGRATEDCIRCUIT
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 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
1/2Vref
ERROR
AMPLIFIER
5V REF
S/R
Vref
Good
Logic
U.V.L.O
1/3Vref
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
µJ
V
mA
W
W
°C
UTC
UNISONIC TECHNOLOGIES CO., LTD. 1
QW-R103-002,A

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