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부품번호 | UC3842B 기능 |
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기능 | HIGH PERFORMANCE CURRENT MODE CONTROLLERS | ||
제조업체 | Unisonic Technologies | ||
로고 | |||
전체 11 페이지수
UNISONIC TECHNOLOGIES CO., LTD
UC3842B/3843B
LINEAR INTEGRATED CIRCUIT
HIGH PERFORMANCE
CURRENT MODE
CONTROLLERS
DESCRIPTION
The UTC UC3842B/3843B are specifically designed for
off-line and dc-to-dc converter applications offering the designer
a cost-effective solution with minimal external components.
The UC3842B has UVLO thresholds 16V (on) and 10V(off),
ideally suited for off-line converters. The UC3843B is tailored for
lower voltage applications having UVLO thresholds of 8.4V(on)
and 7.6V(off).
FEATURES
* Trimmed oscillator for precise frequency control
* Oscillator frequency guaranteed at 250kHz
* Current mode operation to 500kHz
* Automatic feed forward compensation
* Latching PWM for cycle-by-cycle current limiting
* Internally trimmed reference with undervoltage lockout
* High current totem pole output
* Undervoltage lockout with hysteresis
* Low startup and operating current
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
UC3842BL-D08-T
UC3842BP-D08-T
- UC3842BP-S08-R
UC3843BL-D08-T
UC3843BP-D08-T
- UC3843BP-S08-R
Package
DIP-8
SOP-8
DIP-8
SOP-8
Packing
Tube
Tape Reel
Tube
Tape Reel
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
1 of 11
QW-R103-012.F
UC3842B/3843B
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS(TA=25°C, unless otherwise specified)
PARAMETER
SYMBOL
RATINGS
UNIT
Total Power Supply and Zener Current
(ICC + IZ)
30
mA
Output Current, Source or Sink (Note 2)
Output Energy (capacitive load per cycle)
IO
W
1.0 A
5.0 μJ
Current Sense and Voltage Feedback Inputs
Error Amp. Output Sink Current
VIN
IO(SINK)
-0.3 ~ +5.5
10
V
mA
Power Dissipation
DIP-8
SOP-8
PD
1250
800
mW
mW
Operating Junction Temperature
Operating Temperature
TJ
TOPR
+150
0 ~ +70
°C
°C
Storage Temperature
TSTG
-65 ~ +150
°C
Notes: 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. Maximum Package power dissipation limits must be observed.
THERMAL DATA
PARAMETER
Junction to Ambient
DIP-8
SOP-8
SYMBOL
θJA
RATINGS
100
156
UNIT
C/W
C/W
ELECTRICAL CHARACTERISTICS
(0°C ≤TA≤70°C, VCC=15V (Note 1), RT=10k, CT=3.3nF, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
REFERENCE SECTION
Output Voltage
Line Regulation
Load Regulation
Temperature Stability
Total Output Variation
Output Noise Voltage
Long Term Stability
Output Short Circuit Current
VREF
∆VLINE
∆VLOAD
TS
VREF
eN
S
ISC
IO=1.0mA, TJ =25°C
VCC=12V ~ 25V
IO=1.0mA ~ 20mA
Line, Load, Temperature
F=10kHz ~ 10Hz, TJ =25°C
TA=125°C,1000Hrs
OSCILLATOR SECTION
Frequency
Frequency Change with Voltage
Frequency Change with
Temperature
Oscillator Voltage Swing
(Peak to Peak)
F
fOSC/V
TJ =25°C
TA=0°C ~ 70°C
TJ =25°C (RT=6.2k,CT=1.0nF)
12 ≤ VCC ≤25V
fOSC/T 0°C ≤TA ≤70°C
VOSC
Discharge Current
IDISCHG
TJ =25°C
0°C ≤TA ≤70°C
MIN
4.9
4.82
-30
49
48
225
7.8
7.6
TYP
5.0
2.0
3.0
0.2
50
5
-85
52
250
0.2
0.5
1.6
8.3
8.3
MAX UNIT
5.1
20
25
5.18
-180
V
mV
mV
mV/°C
V
μV
mV
mA
55
56 kHz
275
1.0 %
%
V
8.8
8.8
mA
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
4 of 11
QW-R103-012.F
4페이지 UC3842B/3843B
APPLICATION INFORMATION(Cont.)
Current Sense Circuit
LINEAR INTEGRATED CIRCUIT
Peak current (IS) is equaled:
IS(MAX)=1.0V/RS
There should be a small RC filter to suppress switch transients.
Oscillator Waveforms and Maximum Duty Cycle
VREF 8
RT/RC 4
GND 5
RT
CT
LARGE RT
SMALL CT
SMALL CT
LARGE RT
V4
INTERINAL CLOCK
V4
INTERINAL CLOCK
CT (Oscillator timing capacitor) can be charged by VREF through RT and discharged by an internal current source.
At discharge time, the internal clock signal blanks the output to the low. Both oscillator frequency and maximum duty
cycle can be determined by Selection of RT and CT. All charge and discharge times can be calculated by the next
formulas:
tC=0.55 RT CT
tD=RTCTIN
0.0063R T
0.0063R
2.7
T 4
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
7 of 11
QW-R103-012.F
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다운로드 | [ UC3842B.PDF 데이터시트 ] |
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구매 문의 | 일반 IC 문의 : 샘플 및 소량 구매 ----------------------------------------------------------------------- IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한 광범위한 전력 반도체를 판매합니다. 전력 반도체 전문업체 상호 : 아이지 인터내셔날 사이트 방문 : [ 홈페이지 ] [ 블로그 1 ] [ 블로그 2 ] |
부품번호 | 상세설명 및 기능 | 제조사 |
UC3842 | Current Mode PWM Controller (Rev. C) | Texas Instruments |
UC3842 | Current-mode PWM controller | Philips |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |