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UTCUC3842A の電気的特性と機能

UTCUC3842AのメーカーはUnisonic Technologiesです、この部品の機能は「CURRENT MODE PWM CONTROL CIRCUITS」です。


製品の詳細 ( Datasheet PDF )

部品番号 UTCUC3842A
部品説明 CURRENT MODE PWM CONTROL CIRCUITS
メーカ Unisonic Technologies
ロゴ Unisonic Technologies ロゴ 




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UTCUC3842A Datasheet, UTCUC3842A PDF,ピン配置, 機能
UTCUC3842A/3843A LINEARINTEGRATEDCIRCUIT
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 a minimal external
part count
SOP-8
FEATURES
*Low external part count.
*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
BLOCK DIAGRAM
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
U.V.L.O
1/3Vref
CURRENT
SENSE
COMPARATOR
1V R
PWM
LATCH
S
OSCILLATOR
DIP-8
7 Vcc
5 GND
7 Vcc
6 OUTPUT
5 GND
ABSOLUTE MAXIMUM RATINGS(Ta=25°C)
PARAMETER
SYMBOL
Supply Voltage(Low Impedance Source)
VCC
Supply Voltage(Icc<30mA)
Vcc
Output Current ( Peak )
Io
Output Energy(capacity Load)
Analog Inputs(pin 2,3)
VI(ANA)
Error Amplifier Output Sink Current
ISINK(EA)
Power Dissipation
PD DIP-8
SOP-8
Lead Temperature( Soldering 10 Sec )
Tlead
VALUE
30
Self Limiting
+-1
5
-0.3 ~ +6.3
10
at Tamb<=25°C 1.0
at Tamb<=25°C 0.5
300
UNIT
V
V
A
µJ
V
mA
W
W
°C
UTC
UNISONIC TECHNOLOGIES CO., LTD. 1
QW-R103-002,A

1 Page





UTCUC3842A pdf, ピン配列
UTCUC3842A/3843A LINEARINTEGRATEDCIRCUIT
PARAMETER
Minimum Duty Cycle
Total Standby Current
SYMBOL
D(MIN)
TEST CONDITIONS
MIN TYP MAX UNIT
0%
Start-up Current
Operating Supply Current
Vcc Zener Voltage
IST
ICC(opr)
Vz
Vpin 2=Vpin 3=0V
Icc=25mA
note 2:These parameters, although guaranteed ,are not 100% tested in production.
note 3:Parameters measured at trip point of latch with Vpin 2=0.
note 4:Gain defined as:
A=
Vpin 1
Vpin 3
; 0<=Vpin3<=0.8V
note 5:Adjust Vcc above the start threshold before setting at 15V.
0.12 0.3
11 17
34
OPEN-LOOP LABORATORY TEST FIXTURE
RT
1
8
Vref
A Vcc
Error Amp
Adjust
5k
CT
2
3
4
7
1k
/ 1W
6
OUTPUT
5
mA
mA
V
High peak current associated with capacity loads necessitate careful grounding techniques. Timing and bypass
capacitors should be connected close to pin 5 in single point GND. The transistor and 5kpotentio-meter are used
to sample the oscillator waveform and apply an adjustable Ramp to Pin 3.
UNDER-VOLTAGE LOCKOUT
Vcc
7
ON/OFF Command
to rest of IC
Icc
<15mA
Von=16V
Voff=10V
<1mA
Voff Von
Vcc
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 activating the power switch with output leakage currents.
UTC
UNISONIC TECHNOLOGIES CO., LTD. 3
QW-R103-002,A


3Pages


UTCUC3842A 電子部品, 半導体
UTCUC3842A/3843A LINEARINTEGRATEDCIRCUIT
TYPICAL PERFORMANCE CHARACTERISTICS
4 100
Vcc=15V
3 Ta=+25°C
Ta=-55°C
2
80 0
60 -45
40 -90
1
0
0.01
0.1
Output Current
(Sourse or Sink Current) (A)
1
Output Saturation Characteristics
20 -135
0 -180
10 102 103 104 105 106 107
Frequency (Hz)
Error Amplifier Open-Loop Frequency Response
UTC
UNISONIC TECHNOLOGIES CO. LTD 6
QW-R103-002,A

6 Page



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共有リンク

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部品番号部品説明メーカ
UTCUC3842A

CURRENT MODE PWM CONTROL CIRCUITS

Unisonic Technologies
Unisonic Technologies


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