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PDF UC3844 Data sheet ( Hoja de datos )
| Número de pieza | UC3844 | |
| Descripción | (UC3844 / UC3845) HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de UC3844 (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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UNISONIC TECHNOLOGIES CO., LTD
UC3844/45
LINEAR INTEGRATED CIRCUIT
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
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
UC3844L-D08-T
UC3844G-D08-T
UC3844L-S08-R
UC3844G-S08-R
UC3844L-S08-T
UC3844G-S08-T
UC3845L-D08-T
UC3845G-D08-T
UC3845L-S08-R
UC3845G-S08-R
UC3845L-S08-T
UC3845G-S08-T
Package
DIP-8
SOP-8
SOP-8
DIP-8
SOP-8
SOP-8
Packing
Tube
Tape Reel
Tube
Tube
Tape Reel
Tube
www.unisonic.com.tw
Copyright © 2012 Unisonic Technologies Co., Ltd
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UC3844/45
TYPICAL CHARACTERISTICS
LINEAR INTEGRATED CIRCUIT
Error Amp Open Loop Gain Phase vs. Frequency
100 0
VCC = 15V
80
Gain
VOUT = 2.0V ~ 4.0V
RL = 100k
TA = 25℃
30
60 60
40 90
Phase
20 120
0 150
-20
10
180
100 1.0k 10k 100k 1.0M 10M
Frequency, f (Hz)
Current Sense Input Threshold vs. Error Amp
Output Voltage
1.2
1.0
TA = 125℃
0.8
TA = 25℃
0.6
0.4
0.2
0
0
TA = -55℃
VCC = 15V
2.0 4.0 6.0
Error Amp Output Voltage, VOUT (V)
8.0
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet UC3844.PDF ] | |
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