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UTC3842 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 UTC3842
기능 CURRENT MODE PWM CONTROL CIRCUITS
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UTC3842 데이터시트, 핀배열, 회로
UTC3842
LINEAR INTEGRATED CIRCUIT
CURRENT MODE PWM CONTROL
CIRCUITS
DESCRIPTION
The UTC3842 provides the necessary features to
implement off-line or DC to DC fixed frequency current mode
control schemes with a minimal external parts count.
Internally implemented circuits include under-voltage lockout
featuring start up current less than 1mA,a precision
reference trimmed for accuracy at the error amp input, logic
to insure latched operation, a PWM comparator which also
provides current limit control, and a totem pole output stage
designed to source or sink high peak current. The output
stage, suitable for driving N channel MOSFETs, is low in the
off state.
DIP-8
SOP-8
FEATURES
*Optimized for off-line and DC to DC converts
*Low start up current(<1mA)
*Automatic feed forward compensation
*Pulse-by-Pulse current limiting
*Enhanced load response characteristics
*Under-voltage lockout with hysteresis
BLOCK DIAGRAM
*Double pulse Suppression
*High current totem pole output
*Internally trimmed band-gap reference
*500kHz operation
*Low Ro error amp
Vref 8
Internal
Bias
VFB 2
COMP 1
CURRENT SENSE 3
RT/CT 4
1/2Vref
ERROR
AMPLIFIER
5V REF
S/R
Vref
Good
Logic
1/3Vref
U.V.L.O
CURRENT
SENSE
COMPAREATOR
1V R
PWM
LATCH
S
OSCILLATOR
7 Vcc
5 GND
7 Vcc
6 OUTPUT
5 GND
YOUWANG ELECTRONICS CO.LTD
1
2005.06.09 V1.1




UTC3842 pdf, 반도체, 판매, 대치품
UTC3842
LINEAR INTEGRATED CIRCUIT
UNDER-VOLTAGE LOCKOUT
Vcc
7
ON/OFF Command
to rest of IC
Icc
>15mA
Von=16V
Voff=10V
During Under-Voltage Lockout, the output driver is
biased to a high impedance state. Pin 6 should be
shunt to GND with a bleeder resistor to prevent
ERROR AMPLIFIER CONFIGURATION
<1mA
Von Voff
Vcc
activating the power switch with output leakage
currents.
2.5V
0.5mA
Zi 2
Zf 1
Error amplifier can source or sink up to 0.5mA
CURRENT SENSE CIRCUIT
Is
R
Rs
1
3
C
5
Error
Amplifier
2R
R
1V
Current Sense
Comparator
Peak current (Is) determined by the formula:
Ismax=10V/Rs.
A small RC filter be required to suppress switch transients.
YOUWANG ELECTRONICS CO.LTD
4
2005.06.09 V1.1

4페이지










UTC3842 전자부품, 판매, 대치품
UTC3842
LINEAR INTEGRATED CIRCUIT
4
Vcc=15V
Ta=+25
3 Ta=-55
2
1
0
0.01
0.1
Output Current
(Sourse or Sink Current) (A)
1
Output Saturation Characteristics
100
80 0
60 -45
40 -90
20 -135
0 -180
10 102 103 104 105 106 107
Frequency (Hz)
Error Amplifier Open-Loop
Frequency Response
YOUWANG ELECTRONICS CO.LTD
7
2005.06.09 V1.1

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전력 반도체 판매 ( IGBT, TR 모듈, SCR, 다이오드 모듈 )

휴대전화 : 010-3582-2743


상호 : 아이지 인터내셔날

전화번호 : 051-319-2877, [ 홈페이지 ]



링크공유

링크 :

관련 데이터시트

부품번호상세설명 및 기능제조사
UTC3842

CURRENT MODE PWM CONTROL CIRCUITS

YOUWANG ELECTRONICS
YOUWANG ELECTRONICS
UTC3842A

(UTC3842A /UTC3843A) CURRENT MODE PWM CONTROL CIRCUITS

UNISONIC TECHNOLOGIES
UNISONIC TECHNOLOGIES

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