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UC2845 데이터시트 PDF




Unisonic Technologies에서 제조한 전자 부품 UC2845은 전자 산업 및 응용 분야에서
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부품번호 UC2845 기능
기능 HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
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UC2845 데이터시트, 핀배열, 회로
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
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QW-R103-051.B




UC2845 pdf, 반도체, 판매, 대치품
UC2844/45
LINEAR INTEGRATED CIRCUIT
„ ABSOLUTE MAXIMUM RATINGS (TA=25°С, unless otherwise specified)
PARAMETER
SYMBOL
RATINGS
UNIT
Current Sense and Voltage feedback Inputs
Total Power Supply and Zener Current
VIN
(ICC+IZ)
-0.3 ~ +5.5
30
V
mA
Error Amp Output Sink Current
Output Current, Source or Sink (Note 2)
ISINK
IOUT
10 mA
1.0 A
Output Energy (Capacitive Load per cycle)
W
5.0 μJ
Power Dissipation
PD 800 mW
Junction Temperature
Operating Junction Temperature
TJ
TJ(OPR)
+150
-40 ~ +120
°С
°С
Storage Temperature
TSTG
-65 ~ +150
°С
Note:1.Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
2.Maxmum package power dissipation limits must be observed.
„ THERMAL DATA
PARAMETER
Junction to Ambient
SYMBOL
θJA
RATINGS
156
„ ELECTRICAL CHARACTERISTICS
(TA=25°С, VCC=15V, RT=10k, CT=3.3nF, -40°С ≤ TA 120°С, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
REFERENCE SECTION
Reference Output Voltage
Line Regulation
Load Regulation
Temperature Stability
Total Output Variation over Line,
Load, Temperature
Output Noise Voltage
Long Term Stability
Output Short Circuit Current
VREF
VOUT
VOUT
tS
VREF
eN
S
ISC
IOUT=1.0mA,TJ=25°С
VCC=12V ~ 25V
IOUT=1.0mA ~ 20mA
f=10Hz ~ 10kHz, TJ=25°С
TA=125°С for 1000 Hours
4.95
4.9
-30
OSCILLATOR SECTION
Oscillator Voltage Swing
Discharge Current
Frequency
Frequency Change with Voltage
Frequency Change with Temperature
VOSC
IDSG
fOSC
ΔfOSC/ΔV
ΔfOSC/ΔT
VOSC=2.0V, TJ=25°С
TJ=25°С,
TLOW TA THI
VCC=12V ~ 25V
TLOW TA THI
47
46
ERROR AMPLIFIER SECTION
Voltage Feedback Input
Output Voltage Swing
High
Low
Output Current
Sink
Source
Input Bias Current
Open Loop Voltage Gain
Power Supply Rejection Ratio
Unity Gain Bandwidth
VFB
VOH
VOL
ISINK
ISOURCE
II(BIAS)
GVO
PSRR
GBW
VOUT=2.5V
RL=15k to ground, VFB=2.3V
RL=15k to VREF, VFB=2.7V
VOUT=1.1V, VFB=2.7V
VOUT=5.0V, VFB=2.3V
VFB=2.7V
VOUT=2.0V ~ 4.0V
VCC=12V ~ 25V
TJ=25°С
2.45
5.0
2.0
-0.5
65
60
0.7
TYP
5.0
2.0
3.0
0.2
50
5
-85
1.6
10.8
52
0.2
5.0
2.50
6.2
0.8
12
-1.0
-0.1
90
70
1.0
UNIT
°С /W
MAX UNIT
5.05 V
20 mV
25 mV
mV/°С
5.1 V
-180
μV
mV
mA
V
mA
57
60
kHz
1.0 %
%
2.55 V
1.1 V
mA
-1.0 μA
dB
dB
MHz
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R103-051.B

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UC2845 전자부품, 판매, 대치품
UC2844/45
„ TYPICAL CHARACTERISTICS(Cont.)
LINEAR INTEGRATED CIRCUIT
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R103-051.B

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