UNISONIC TECHNOLOGIES CO., LTD
UC3844/45
HIGH PERFORMANCE
CURRENT MODE PWM
CONTROLLERS
DESCRIPTION
The UTC
UC3844/3845
are high performance fixed frequency
current mode controllers that specifically designed for Off-Line and
DC to DC converter applications with minimal external parts count.
The differences between
UC3844
and
UC3845
are the maximum
duty cycle ranges and under-voltage lockout thresholds. The
UC3844
ideally suited to off-line applications with UVLO thresholds
of 16V
(ON)
and 10V
(OFF)
, and
UC3845
has UVLO thresholds of
8.5V
(ON)
and 7.6V
(OFF)
for lower voltage applications.
LINEAR INTEGRATED CIRCUIT
FEATURES
* Operation output switching frequency up to 500 kHz
* Output deadtime adjustable from 50% to 70%
* Automatic feed forward compensation
* Latching PWM for cycle-by-cycle current limiting
* High current totem pole output
* Internally trimmed reference with under voltage lockout
* UVLO with hysteresis
* Low startup and operating current
*Pb-free plating product number:
UC3844L/UC3845L
ORDERING INFORMATION
Order Number
Normal
Lead Free Plating
UC3844-D08-T
UC3844L-D08-T
UC3844-S08-R
UC3844L-S08-R
UC3844-S08-T
UC3844L-S08-T
UC3845-D08-T
UC3845L-D08-T
UC3845-S08-R
UC3845L-S08-R
UC3845-S08-T
UC3845L-S08-T
Package
DIP-8
SOP-8
SOP-8
DIP-8
SOP-8
SOP-8
Packing
Tube
Tape Reel
Tube
Tube
Tape Reel
Tube
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Copyright © 2005 Unisonic Technologies Co., Ltd
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