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UC3844 Datasheet(PDF) 4 Page - Unisonic Technologies

Part No. UC3844
Description  HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
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Maker  UTC [Unisonic Technologies]
Homepage  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UC3844 Datasheet(HTML) 4 Page - Unisonic Technologies

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UC3844/45
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
4 of 7
www.unisonic.com.tw
QW-R103-010,C
ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
PARAMETER
SYMBOL
RATINGS
UNIT
Total Power Supply and Zener Current
(ICC+Iz)
30
mA
Output Current, Source or Sink (Note 2)
IOUT
1.0
A
Output Energy (Capacitive Load per cycle)
W
5.0
μJ
Current Sense and Voltage feedback Inputs
VIN
-0.3 ~ +5.5
V
Error Amp Output Sink Current
ISINK
10
mA
SOP-8
862
mW
Power Dissipation
DIP-8
PD
1250
mW
Junction Temperature
TJ
+150
°C
Operation Temperature Range
TOPR
0 ~ 70
°C
Storage Temperature Range
TSTG
-65 ~ +150
°C
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
SYMBOL
RATINGS
UNIT
SOP-8
145
°C/W
Thermal Resistance(Junction-to-Air)
DIP-8
θJA
100
°C/W
ELECTRICAL CHARACTERISTICS
(Ta=25
°C, VCC=15V, RT=10k, CT=3.3nF, 0°C TA 70°C, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
REFERENCE SECTION
Reference Output Voltage
VREF
IOUT=1.0mA,TJ=25 C
4.9
5.0
5.1
V
Line Regulation
VOUT
VCC=12V ~ 25V
2.0
20
mV
Load Regulation
VOUT
IOUT=1.0mA ~ 20mA
3.0
25
mV
Temperature Stability
tS
0.2
mV/
°C
Total Output Variation over Line,
Load, Temperature
VREF
4.82
5.18
V
Output Noise Voltage
eN
f=10Hz ~ kHz, TJ=25°C
50
μV
Long Term Stability
S
TA=125°C for 1000 Hours
5
mV
Output Short Circuit Current
ISC
-30
-85
-180
mA
OSCILLATOR SECTION
Oscillator Voltage Swing
VOSC
1.6
V
Discharge Current
IDSG
VOSC=2.0V, TJ=25
°C
10.8
mA
TJ=25°C,
47
52
57
Frequency
fOSC
0
°C
TA 70°C
46
60
kHz
Frequency Change with Voltage
ΔfOSC/ΔV
VCC=12V ~ 25V
0.2
1.0
%
Frequency Change with Temperature
ΔfOSC/ΔT
0
°C
TA 70°C
5.0
%
ERROR AMPLIFIER SECTION
Voltage Feedback Input
VFB
VOUT=2.5V
2.42
2.50
2.58
V
High
VOH
RL=15k to ground, VFB=2.3V
5.0
6.2
Output Voltage Swing
Low
VOL
RL=15k to VREF, VFB=2.7V
0.8
1.1
V
Sink
ISINK
VOUT=1.1V, VFB=2.7V
2.0
12
Output Current
Source
ISOURCE
VOUT=5.0V, VFB=2.3V
-0.5
-1.0
mA
Input Bias Current
II(BIAS)
VFB=2.7V
-0.1
-2.0
μA
Open Loop Voltage Gain
GVO
VOUT=2.0V ~ 4.0V
65
90
dB
Power Supply Rejection Ratio
PSRR
VCC=12V ~ 25V
60
70
dB
Unity Gain Bandwidth
GBW
TJ=25°C
0.7
1.0
MHz


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