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UC3844 Datasheet(PDF) 1 Page - Unisonic Technologies

Part No. UC3844
Description  HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
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Maker  UTC [Unisonic Technologies]
Homepage  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UC3844 Datasheet(HTML) 1 Page - Unisonic Technologies

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UNISONIC TECHNOLOGIES CO., LTD
UC3844/45
LINEAR INTEGRATED CIRCUIT
www.unisonic.com.tw
1 of 7
Copyright © 2005 Unisonic Technologies Co., Ltd
QW-R103-010,C
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.
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
Package
Packing
UC3844-D08-T
UC3844L-D08-T
DIP-8
Tube
UC3844-S08-R
UC3844L-S08-R
SOP-8
Tape Reel
UC3844-S08-T
UC3844L-S08-T
SOP-8
Tube
UC3845-D08-T
UC3845L-D08-T
DIP-8
Tube
UC3845-S08-R
UC3845L-S08-R
SOP-8
Tape Reel
UC3845-S08-T
UC3845L-S08-T
SOP-8
Tube


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