UC2843BL-D08-T 查看數據表（PDF） - Unisonic Technologies
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UC2843BL-D08-T Datasheet PDF : 9 Pages
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UNISONIC TECHNOLOGIES CO., LTD
UC2843B
LINEAR INTEGRATED CIRCUIT
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%.
DIP-8
SOP-8
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
Lead Free
Halogen Free
UC2843BL-D08-T
UC2843BG-D08-T
UC2843BL-S08-T
UC2843BG-S08-T
UC2843BL-S08-R
UC2843BG-S08-R
Package
DIP-8
SOP-8
SOP-8
Packing
Tube
Tube
Tape Reel
UC2843BG-S08-R
(1)Packing Type
(2)Package Type
(3)Green Package
(1) T: Tube, R: Tape Reel
(2) D08: DIP-8, S08: SOP-8
(3) G: Halogen Free and Lead Free, L: Lead Free
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