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PDF UC2843B Data sheet ( Hoja de datos )
| Número de pieza | UC2843B | |
| Descripción | HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de UC2843B (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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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%.
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-S08-R
UC2843BG-S08-R
UC2843BL-S08-T
UC2843BG-S08-T
UC2843BL-D08-T
UC2843BG-D08-T
Package
SOP-8
SOP-8
DIP-8
Packing
Tape Reel
Tube
Tube
www.unisonic.com.tw
Copyright © 2013 Unisonic Technologies Co., Ltd
1 of 8
QW-R103-048.D
1 page  
UC2843B
APPLICATION INFORMATION
Error amplifier (EA) configuration circuit:
LINEAR INTEGRATED CIRCUIT
2.5V
Z1 VFB
Z2 COMP
Note: Error amplifier can source or sink up to 0.5mA.
Current-sense circuit:
EA
Error
Amplifier
0.5mA
Notes: 1. Peak current (IS) is determined by the formula: IS(max) = 1V/RS
2. A small RC filter formed by resistor RF and capacitor CF may be required to suppress switch transients.
The oscillator frequency is set using the circuit:
VREF
RT/CT
GND
RT
CT
The frequency is calculated as followed:
f = 1 / RTCT
For RT > 5kΩ:
f = 1.72 / RTCT
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 8
QW-R103-048.D
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet UC2843B.PDF ] | |
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