UC3842B/3843B LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 4 of 11
www.unisonic.com.tw QW-R103-012.D
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 (note1) Io 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 IO(SINK) 10 mA
DIP-8 1250 mW
Power Dissipation SOP-8 PD 702 mW
Operating Junction Temperature TJ +150 °C
Operating Temperature TOPR 0 ~ +70 °C
Storage Temperature Range TSTG -65 ~ +150 °C
Note 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.
THERMAL DATA
PARAMETER SYMBOL RATINGS UNIT
DIP-8 100 °C/W
Thermal Resistance Junction to Ambient SOP-8 θJA 178 °C/W
ELECTRICAL CHARACTERISTICS
(0°C ≤TA≤70°C, VCC=15V [note 2], RT=10k, CT=3.3nF, unless otherwise specified)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
REFERENCE SECTION
Output Voltage VREF Io=1.0mA, TJ =25°C 4.9 5.0 5.1 V
Line Regulation ΔVLINE VCC=12V ~ 25V 2.0 20 mV
Load Regulation ΔVLOAD Io=1.0mA ~ 20mA 3.0 25 mV
Temperature Stability TS 0.2 mV/°C
Total Output Variation VREF Line, Load, Temperature 4.82 5.18 V
Output Noise Voltage eN F=10kHz ~ 10Hz, TJ =25°C 50 uV
Long Term Stability S TA=125°C,1000Hrs 5 mV
Output Short Circuit Current ISC -30 -85 -180 mA
OSCILLATOR SECTION
Frequency F
TJ =25°C
Ta=0°C ~ 70°C
TJ =25°C (RT=6.2k,CT=1.0nF)
49
48
225
52
250
55
56
275
kHz
Frequency Change with Voltage ΔfOSC/ΔV 12 ≤ VCC ≤25V 0.2 1.0 %
Frequency Change with
Temperature ΔfOSC/ΔT 0°C ≤TA ≤70°C 0.5 %
Oscillator Voltage Swing(Peak to
Peak) VOSC 1.6 V
Discharge Current Idischg TJ =25°C
0°C ≤TA ≤70°C
7.8
7.6 8.3 8.8
8.8 mA
ERROR AMPLIFIER SECTION
Voltage Feedback Input VFB Vo=2.5V 2.42 2.50 2.58 V
Input Bias Current II(BIAS) V
FB=5.0V -0.1 -2.0 μA
Open Loop Voltage Gain GVO 2 ≤Vo≤4V 65 90 dB
Unity Gain Bandwidth GBW T
J =25°C 0.7 1.0 MHz
Power Supply Rejection Ratio PSRR I2V≤Vcc≤25V 60 70 dB
Output Sink Current ISINK Vo=1.1V,VFB =2.7V 2.0 12 mA
Output Source Current ISOURCE Vo=5.0V,VFB=2.3V -0.5 -1.0 mA
Output Voltage Swing High State VOH V
FB=2.3V, RL=15k to GND 5.0 6.2 V