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UC3842A の電気的特性と機能

UC3842AのメーカーはUnisonic Technologiesです、この部品の機能は「(UC3842A / UC3843A) CURRENT MODE PWM CONTROL CIRCUITS」です。


製品の詳細 ( Datasheet PDF )

部品番号 UC3842A
部品説明 (UC3842A / UC3843A) CURRENT MODE PWM CONTROL CIRCUITS
メーカ Unisonic Technologies
ロゴ Unisonic Technologies ロゴ 




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UC3842A Datasheet, UC3842A PDF,ピン配置, 機能
www.DataSheet4U.com
UNISONIC TECHNOLOGIES CO., LTD
UC3842A/3843A
LINEAR INTEGRATED CIRCUIT
CURRENT MODE PWM
CONTROL CIRCUITS
DESCRIPTION
The UTC UC3842A/3843A provide the necessary functions to
implement off-line or DC to DC fixed frequency current mode ,
controlled switching circuits with minimal external components.
SOP -8
FEATURES
*Low start up current ( Typical 0.12mA )
*Automatic feed forward compensation
*Pulse-by-Pulse current limiting
*Under-voltage lockout with hysteresis
*Double pulse Suppression
*High current totem pole output to drive MOSFET directly
*Internally trimmed band gap reference
*500kHz operation
ORDERING INFORMATION
Ordering Number
Normal
Lead Free Plating
UC3842A-D08-T
UC3842AL-D08-T
UC3842A-S08-R
UC3842AL-S08-R
UC3842A-S08-T
UC3842AL-S08-T
UC3843A-D08-T
UC3843AL-D08-T
UC3843A-S08-R
UC3843AL-S08-R
UC3843A-S08-T
UC3843AL-S08-T
Package
DIP-8
SOP-8
SOP-8
DIP-8
SOP-8
SOP-8
DIP-8
*Pb-free plating product number: UC3842AL
UC3843AL
Packing
Tube
Tape Reel
Tube
Tube
Tape Reel
Tube
UC3842AL-D08-T
(1)Packing Type
(2)Package Type
(3)Lead Plating
(1) T: Tube, R: Tape Reel
(2) D08: DIP-8, S08: SOP-8
(3) L: Lead Free Plating, Blank: Pb/Sn
www.unisonic.com.tw
Copyright © 2005 Unisonic Technologies Co., Ltd
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UC3842A pdf, ピン配列
UC3842A/3843A
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS (Ta=25 )
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage(Low Impedance Source)
VCC 30 V
Supply Voltage(ICC<30mA)
Output Current ( Peak )
Output Energy (capacity Load)
VCC
IO(PEAK)
Self Limiting
1
5
V
A
µJ
Analog Inputs(pin 2,3)
VI(ANA)
-0.3 ~ +6.3
V
Error Amplifier Output Sink Current
ISINK(EA)
10 mA
Power Dissipation( Ta 25°C)
DIP-8
SOP-8
PD
1.0 W
0.5 W
Derated at Ta>25°C
Junction Temperature
Storage Temperature
PD
TJ
TSTG
8
+150
-65 ~ +150
mW/°C
°C
°C
Note Absolute maximum ratings are those values beyond which the device which the device could be permanently
damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied.
ELECTRICAL CHARACTERISTICS
(0°C T 70°C, VCC=15V, RT=10k, CT=3.3nF, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
Reference Section
Output Voltage
Line Regulation
Load Regulation
VREF
VREF
VREF
TJ=25°C,IOUT=1mA
12 VIN25V
1 IOUT=20mA
Temperature Stability
(Note 1)
Total Output Variation
Line, Load, Temp(Note 1)
Output Noise Voltage
Vosc 10Hz f 10kHz,TJ=25°C (Note 1)
Long Term Stability
Ta=25°C,1000Hrs(Note 1)
Output Short Circuit
ISC
Oscillator Section
Initial Accuracy
Voltage Stability
f TJ=25°C
f/Vcc 12 VCC 25V
Temperature Stability
Tmin Ta Tmax(Note 1)
Amplitude
Vosc Vpin 4 peak to peak
Error Amplifier Section
Input Voltage
VI(EA) Vpin 1=2.5V
Input Bias Current
AVOL
II(BIAS)
2 VOUT 4V
Unity Gain Bandwidth
PSRR
TJ=25°C (Note 1)
I2 VCC 25V
Output Sink Current
IO(SINK) Vpin 2=2.7V,Vpin 1=1.1V
Output Source Current
VOUT High
IO(SOURCE) Vpin 2=2.3V,Vpin 1=5V
VOH Vpin 2=2.3V, RL=15kto GND
VOUT Low
VOL Vpin 2=2.7V,Vpin 1=1.1V
MIN TYP MAX UNIT
4.9 5 5.1 V
6 20 mV
6 25 mV
0.2 0.4 mV/°C
4.82 5.18 V
50 µV
5 25 mV
-30 -100 -180 mA
47 52 57 kHz
0.2 1
%
5%
1.7 V
2.42 2.50 2.58 V
-0.3 -2 µA
60 90
dB
0.7 1
MHz
60 70
dB
26
mA
-0.5 -0.8
mA
56
V
0.7 1.1 V
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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UC3842A 電子部品, 半導体
UC3842A/3843A
CURRENT SENSE CIRCUIT
Is
R
Rs
1
3
C
5
Error Amplifier
2R
R
LINEAR INTEGRATED CIRCUIT
1V
Current Sense Comparator
Peak current (Is) determined by the formula: Ismax=10V/Rs.
A small RC filter be required to suppress switch transients.
SLOPE COMPENSATION
8
RT
4
CT
R1 R2
Isense
3
C Rsense
A fraction of the oscillator ramp can be resistively summed with the current sense signal to provide slope
compensation for converts requiring duty cycles over 50%.Note that capacitor C, forms a filter with R2 to suppress
the leading edge switch spikes.
OSCILLATOR SECTION
Large RT
8 Small CT
RT
4
5
CT Small RT
Large CT
V4
INTERNAL CLOCK
V4
INTERNAL CLOCK
Dead time vs. CT(RT>5k)
100
10
1
0.1 1
10
CT (nF)
100
Timing Resistance vs. Frequency
100
CT=2.2nF
CT=4.7nF
10 CT=10nF
CT=22nF
CT=47nF
CT=100nF
1
10 2
103 104 105
Frequency (Hz)
10 6
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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共有リンク

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