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UC2843BG-D08-T 데이터시트(PDF) 1 Page - Unisonic Technologies

부품명 UC2843BG-D08-T
상세설명  HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
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제조업체  UTC [Unisonic Technologies]
홈페이지  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UC2843BG-D08-T 데이터시트(HTML) 1 Page - Unisonic Technologies

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UNISONIC TECHNOLOGIES CO., LTD
UC2843B
LINEAR INTEGRATED CIRCUIT
www.unisonic.com.tw
1 of 8
Copyright © 2013 Unisonic Technologies Co., Ltd
QW-R103-048.D
HIGH-PERFORMANCE
CURRENT-MODE PWM
CONTROLLERS
DESCRIPTION
The
UTC
UC2843B
provides
off-line
or
DC-DC
fixed-frequency current-mode control design with minimum
external components. Internally-implemented circuits include an
under-voltage lockout (UVLO) and a precision reference with
accuracy at the error amplifier input. The UTC UC2843B also
contain internal circuits which include a pulse width modulation
(PWM) comparator providing current-limit control, logic ensuring
latched operation, and a totem-pole output stage designed to
source or sink high-peak current. The output stage is low when it
is in off-state condition and suitable for N-channel MOSFETs
driving.
The UTC UC2843B also has following advantages: the
start-up current lower than 0.5mA while the oscillator discharge
current is specified to 8.3mA (Typ.). In UVLO conditions, the
output has a maximum saturation voltage of 1.2V when sinking
10mA@VCC = 5V.
The typical UVLO threshold of the UTC UC2843B is 8.4V
(on) and 7.6V (off) and can operate to duty cycles approximately
100%.
FEATURES
* Current mode operation:500 kHz
* Low start-up current value<0.5mA
* Latching PWM for cycle-by-cycle current limiting
* Trimmed oscillator discharge current
* Automatic feed-forward compensation
* Internally trimmed reference with UVLO
* High-current totem-pole output UVLO with hysteresis
* Double-pulse suppression
ORDERING INFORMATION
Ordering Number
Package
Packing
Lead Free
Halogen Free
UC2843BL-S08-R
UC2843BG-S08-R
SOP-8
Tape Reel
UC2843BL-S08-T
UC2843BG-S08-T
SOP-8
Tube
UC2843BL-D08-T
UC2843BG-D08-T
DIP-8
Tube


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