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UC3842A Datasheet(PDF) 3 Page - ON Semiconductor

Part No. UC3842A
Description  High Performance Current Mode Controllers
Download  18 Pages
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

UC3842A Datasheet(HTML) 3 Page - ON Semiconductor

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UC3842A, UC3843A, UC2842A, UC2843A
http://onsemi.com
3
ELECTRICAL CHARACTERISTICS (VCC = 15 V, [Note 2], RT = 10 k, CT = 3.3 nF, TA = Tlow to Thigh [Note 3],
unless otherwise noted.)
Characteristics
Symbol
UC284XA
UC384XA
Unit
Min
Typ
Max
Min
Typ
Max
REFERENCE SECTION
Reference Output Voltage (IO = 1.0 mA, TJ = 25°C)
Vref
4.95
5.0
5.05
4.9
5.0
5.1
V
Line Regulation (VCC = 12 V to 25 V)
Regline
2.0
20
2.0
20
mV
Load Regulation (IO = 1.0 mA to 20 mA)
Regload
3.0
25
3.0
25
mV
Temperature Stability
TS
0.2
0.2
mV/
°C
Total Output Variation over Line, Load, Temperature
Vref
4.9
5.1
4.82
5.18
V
Output Noise Voltage (f = 10 Hz to 10 kHz,
TJ = 25°C)
Vn
50
50
mV
Long Term Stability (TA = 125°C for 1000 Hours)
S
5.0
5.0
mV
Output Short Circuit Current
ISC
− 30
− 85
− 180
− 30
− 85
− 180
mA
OSCILLATOR SECTION
Frequency
TJ = 25°C
TA = Tlow to Thigh
fosc
47
46
52
57
60
47
46
52
57
60
kHz
Frequency Change with Voltage (VCC = 12 V to 25 V)
Dfosc/DV
0.2
1.0
0.2
1.0
%
Frequency Change with Temperature
TA = Tlow to Thigh
Dfosc/DT
5.0
5.0
%
Oscillator Voltage Swing (Peak−to−Peak)
Vosc
1.6
1.6
V
Discharge Current (Vosc = 2.0 V)
TJ = 25°C
TA = Tlow to Thigh
Idischg
7.5
7.2
8.4
9.3
9.5
7.5
7.2
8.4
9.3
9.5
mA
ERROR AMPLIFIER SECTION
Voltage Feedback Input (VO = 2.5 V)
VFB
2.45
2.5
2.55
2.42
2.5
2.58
V
Input Bias Current (VFB = 2.7 V)
IIB
−0.1
−1.0
−0.1
−2.0
mA
Open Loop Voltage Gain (VO = 2.0 V to 4.0 V)
AVOL
65
90
65
90
dB
Unity Gain Bandwidth (TJ = 25°C)
BW
0.7
1.0
0.7
1.0
MHz
Power Supply Rejection Ratio (VCC = 12 V to 25 V)
PSRR
60
70
60
70
dB
Output Current
Sink (VO = 1.1 V, VFB = 2.7 V)
Source (VO = 5.0 V, VFB = 2.3 V)
ISink
ISource
2.0
−0.5
12
−1.0
2.0
−0.5
12
−1.0
mA
Output Voltage Swing
High State (RL = 15 k to ground, VFB = 2.3 V)
Low State (RL = 15 k to Vref, VFB = 2.7 V)
VOH
VOL
5.0
6.2
0.8
1.1
5.0
6.2
0.8
1.1
V
2. Adjust VCC above the Startup threshold before setting to 15 V.
3. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
Tlow =0°C for UC3842A, UC3843A
Thigh = +70°C for UC3842A, UC3843A
−25
°C for UC2842A, UC2843A
+85
°C for UC2842A, UC2843A


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