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
ORDERING INFORMATION
Ordering Number
Lead Free
UC3844L-D08-T
UC3844L-S08-R
UC3844L-S08-T
UC3845L-D08-T
UC3845L-S08-R
UC3845L-S08-T
Halogen Free
UC3844G-D08-T
UC3844G-S08-R
UC3844G-S08-T
UC3845G-D08-T
UC3845G-S08-R
UC3845G-S08-T
Package
DIP-8
SOP-8
SOP-8
DIP-8
SOP-8
SOP-8
Packing
Tube
Tape Reel
Tube
Tube
Tape Reel
Tube
www.unisonic.com.tw
Copyright © 2011 Unisonic Technologies Co., Ltd
1 of 7
QW-R103-010.D
UTC-IC [ UNISONIC TECHNOLOGIES ]
