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UC3842G の電気的特性と機能

UC3842GのメーカーはUnisonic Technologiesです、この部品の機能は「HIGH PERFORMANCE CURRENT MODE CONTROLLER」です。


製品の詳細 ( Datasheet PDF )

部品番号 UC3842G
部品説明 HIGH PERFORMANCE CURRENT MODE CONTROLLER
メーカ Unisonic Technologies
ロゴ Unisonic Technologies ロゴ 




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UC3842G Datasheet, UC3842G PDF,ピン配置, 機能
UNISONIC TECHNOLOGIES CO., LTD
UC3842G
LINEAR INTEGRATED CIRCUIT
HIGH PERFORMANCE
CURRENT MODE
CONTROLLER
DESCRIPTION
The UTC UC3842G of high performance current mode
controller is specifically designed for off-line and DC-to-DC
converter applications offering the designer a cost effective
solution with minimal external components. This integrated
circuit features approximately 40μA start up current, a precision
reference trimmed the error amplifier input. Also included are
protective features consisting of input and reference
undervoltage lockouts each with hysteresis, cycle-by-cycle
current limiting, and so on.
FEATURES
* Low startup and operating current
* User defined switching frequency(Norm is 52kHz)
* Power-saving mode for low power
* Under voltage lockout with hysteresis
* Over voltage protection
* Latching PWM for Cycle-By-Cycle current limiting
* Internally trimmed reference with undervoltage lockout
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
UC3842GL-D08-T
UC3842GP-D08-T
- UC3842GP-S08-R
Package
DIP-8
SOP-8
Packing
Tube
Tape Reel
MARKING
DIP-8
SOP-8
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
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UC3842G pdf, ピン配列
UC3842G
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS (TA25°C, unless otherwise specified)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage (Low Impedance Source)
VCC
30 V
Supply Voltage (ICC<30mA)
VCC
Self Limiting
V
Output Current (Peak)
IO(PEAK)
±1
A
Output Energy (Capacity load)
5 μJ
Junction Temperature
TJ
+150
C
Operating Temperature
TOPR
-40 ~ +125
°C
Storage Temperature
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.
ELECTRICAL CHARACTERISTICS
(0°CTA70°C, VCC=15V, CT=3.3nF, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITION
STANDBY SECTION
Reduce Frequency Point of Standby Mode
VCOMP Right load
REFERENCE SECTION
Reference Output Voltage
Line Regulation
Load Regulation
Output Short Circuit Current
VREF
VREF
VREF
ISC
IOUT=1.0mA
12VVCC25V
IOUT=1.0mA to 20mA
OSCILLATOR SECTION
Frequency
Frequency Change
Oscillator Voltage
fOSC
fOSC/V
VOSC(P-P)
VOSCL
VOSCH
Normal
12VVCC25V
ERROR AMPLIFIER SECTION
Input Voltage
Input Bias Current
AVOL
Unity Gain Bandwidth
PSRR
Output Sink Current
Output Source Current
VOUT High
VOUT Low
VI(EA)
II(BIAS)
ISINK
ISOURCE
VOH
VOL
VCOMP=2.5V
VFB=5V
2VVOUT4V
TJ=25°C(Note1)
12VVCC25V
VFB=2.7V, VCOMP=1.1V
VFB=2.3V, VCOMP=5V
VFB=2.3V, RL=15K to GND
VFB=2.7V, RL=15K to VREF
CURRENT SENSE SECTION
Gain
Maximum Input Signal
PSRR
Input Bias Current
Delay to Output
GV
VI(MAX)
IBIAS
(Note2,3)
VCOMP=5V(Note2)
12VVCC25V
MIN TYP MAX UNIT
2.2 V
4.95 5.0 5.05 V
3 20 mV
8 25 mV
-30 -65 -180 mA
49 52 55 KHz
0.2 1.0
1.6 V
1.2 V
2.8 V
2.42 2.50 2.58 V
-0.3 -2 μA
60 90
dB
0.7 1
MHz
60 70
dB
24
mA
-0.5 1
mA
5.0 5.6
V
0.8 1.1 V
2.85 3 3.15 V/V
0.9 1 1.1 V
70 dB
-2 -10 μA
150 300 nS
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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UC3842G 電子部品, 半導体
UC3842G
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=1V/Rs. A small RC filter be required to suppress switch
transients.
OSCILLATOR AND STANDBY MODE
We can judge the state of output load through the voltage of Pin 1. In order to reduce the standby power, it will
reduce the OSC frequency at right load. When VCOMP2.2V, the OSC frequency begins to reduce. The normal
frequency is 52KHz, the minimum frequency is 22KHz.
VCOMP
2.2V
Increase
Normal
Frequency: 52KHz
Standby mode
Minimum frequency :14KHz
OSC triangle wave
1.2V
Normal
Frequency: 52KHz
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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