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Unisonic Technologies

UC2843B Datasheet Preview

UC2843B Datasheet

HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS

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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
www.unisonic.com.tw
Copyright © 2019 Unisonic Technologies Co., Ltd
1 of 9
QW-R103-048.E




Unisonic Technologies

UC2843B Datasheet Preview

UC2843B Datasheet

HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS

No Preview Available !

UC2843B
MARKING
DIP-8
876 5
UTC
UC3842B
1 23 4
Date Code
L: Lead Free
P: Halogen Free
Lot Code
PIN CONFIGURATION
LINEAR INTEGRATED CIRCUIT
SOP-8
876 5
UTC
UC2843B
1234
Date Code
L: Lead Free
G: Halogen Free
Lot Code
COMP 1
VFB 2
ISENSE 3
RT/CT 4
8 VREF
7 VCC
6 OUTPUT
5 GND
PIN DESCRIPTION
PIN NO.
1
2
3
4
5
6
7
8
PIN NAME
COMP
VFB
ISENSE
RT/CT
GND
OUTPUT
VCC
VREF
DESCRIPTION
This pin is the Error Amplifier output and is made available for loop compensation.
This is the inverting input of the Error Amplifier. It is normally connected to the
switching power supply output through a resistor divider.
A voltage proportional to inductor current is connected to this input. The PWM uses
this information to terminate the output switch conduction.
The Oscillator frequency and maximum Output duty cycle are programmed by
connecting resistor RT to VREF and capacitor CT to ground. Operation to 500 kHz is
possible.
This pin is the combined control circuitry and power ground.
This output directly drives the gate of a power MOSFET. Peak currents up to 1.0A are
sourced and sunk by this pin.
This pin is the positive supply of the control IC.
This is the reference output. It provides charging current for capacitor CT through
resistor RT.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 9
QW-R103-048.E


Part Number UC2843B
Description HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
Maker Unisonic Technologies
PDF Download

UC2843B Datasheet PDF






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