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YOUWANG ELECTRONICS - CURRENT MODE PWM CONTROL CIRCUITS

Numéro de référence UTC3842
Description CURRENT MODE PWM CONTROL CIRCUITS
Fabricant YOUWANG ELECTRONICS 
Logo YOUWANG ELECTRONICS 





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UTC3842 fiche technique
UTC3842
LINEAR INTEGRATED CIRCUIT
CURRENT MODE PWM CONTROL
CIRCUITS
DESCRIPTION
The UTC3842 provides the necessary features to
implement off-line or DC to DC fixed frequency current mode
control schemes with a minimal external parts count.
Internally implemented circuits include under-voltage lockout
featuring start up current less than 1mA,a precision
reference trimmed for accuracy at the error amp input, logic
to insure latched operation, a PWM comparator which also
provides current limit control, and a totem pole output stage
designed to source or sink high peak current. The output
stage, suitable for driving N channel MOSFETs, is low in the
off state.
DIP-8
SOP-8
FEATURES
*Optimized for off-line and DC to DC converts
*Low start up current(<1mA)
*Automatic feed forward compensation
*Pulse-by-Pulse current limiting
*Enhanced load response characteristics
*Under-voltage lockout with hysteresis
BLOCK DIAGRAM
*Double pulse Suppression
*High current totem pole output
*Internally trimmed band-gap reference
*500kHz operation
*Low Ro error amp
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
COMPAREATOR
1V R
PWM
LATCH
S
OSCILLATOR
7 Vcc
5 GND
7 Vcc
6 OUTPUT
5 GND
YOUWANG ELECTRONICS CO.LTD
1
2005.06.09 V1.1

PagesPages 9
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