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PDF UC2844 Data sheet ( Hoja de datos )
| Número de pieza | UC2844 | |
| 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 UC2844 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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UNISONIC TECHNOLOGIES CO., LTD
UC2844/45
LINEAR INTEGRATED CIRCUIT
HIGH PERFORMANCE
CURRENT MODE PWM
CONTROLLERS
DESCRIPTION
The UTC UC2844/2845 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 UC2844 and UC2845 are the maximum
duty cycle ranges and under-voltage lockout thresholds. The
UC2844 ideally suited to off-line applications with UVLO thresholds
of 16V(ON) and 10V(OFF), and UC2845 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
UC2844L-S08-R
UC2844G-S08-R
UC2844L-S08-T
UC2844G-S08-T
UC2845L-S08-R
UC2845G-S08-R
UC2845L-S08-T
UC2845G-S08-T
Package
SOP-8
SOP-8
SOP-8
SOP-8
Packing
Tape Reel
Tube
Tape Reel
Tube
www.unisonic.com.tw
Copyright © 2012 Unisonic Technologies Co., Ltd
1 of 7
QW-R103-051.B
1 page  
UC2844/45
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS(Cont.)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNIT
CURRENT SENSE SECTION
Current Sense Input Voltage Gain
Maximum Current Sense Input
Threshold
Input Bias Current
Power Supply Rejection Ratio
Propagation Delay
GV (Note 2, 3)
VI(THR) (Note 2)
II(BIAS)
PSRR
tPLH(IN/OUT)
VCC=12V ~ 25V (Note4)
2.85 3.0 3.15 V/V
0.9 1.0 1.1
V
-2.0 -10 μA
70 dB
150 300 ns
OUTPUT SECTION
Output Voltage
Low
High
Output Voltage with UVLO Activated
Output Voltage Rise Time
Output Voltage Fall Time
VOL
VOH
VOL(UVLO)
tR
tF
ISINK=20mA
ISINK=200mA
ISINK=20mA
ISINK=200mA
VCC=6.0V, ISINK=1.0mA
CL=1.0nF,TJ=25°С
CL=1.0nF,TJ=25°С
0.1 0.4
1.6 2.2
V
13 13.5
12 13.4
V
0.1 1.1
V
50 150 ns
50 150 ns
UNDERVOLTAGE LOCKOUT SECTION
Startup Threshold
UC2844
UC2845
VTHR
15 16.0 17
7.8 8.4 9.0
V
Minimum Operating
Voltage After Turn-On
UC2844
UC2845
VCC(MIN)
9.0 10.0 11.0
7.0 7.6 8.2
V
PWM SECTION
Duty Cycle
MAX
MIN
DCMAX
DCMIN
47 48 50 %
0%
TOTAL DEVICE
Power Supply Zener Voltage
VZ ICC=25mA
30 36 - V
Power Supply Current
(Note 4)
UC2845
UC2844
ICC
VCC=6.5V
VCC=14V
0.5
12
1.0
17
mA
Note: 1. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient
as possible.
2. This parameter is measured at the latch trip point with VFB=0V.
3. Comparator gain is defined as: ΔV Output Compensation
AV=
ΔV Current Sense Input
4. Adjust VCC above the startup threshold before setting to 15V.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 7
QW-R103-051.B
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet UC2844.PDF ] | |
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