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UC3843B-D08-T Datenblatt(PDF) 6 Page - Unisonic Technologies

Teilenummer UC3843B-D08-T
Bauteilbeschribung  HIGH PERFORMANCE CURRENT MODE CONTROLLERS
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Hersteller  UTC [Unisonic Technologies]
Direct Link  http://www.utc-ic.com
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UC3843B-D08-T Datenblatt(HTML) 6 Page - Unisonic Technologies

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UC3842B/3843B
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
6 of 11
www.unisonic.com.tw
QW-R103-012.D
TYPICAL APPLICATION CIRCUIT
Open Loop Test Circuit
All of the parameters are not all tested in production, although been guaranteed. The timing and bypass capacitors
must be connected to pin 5 in a single point ground very closely. To sample the oscillator waveform, the transistor
and 5kΩ potentiometer are used, and also can apply an adjustable ramp to ISENSE pin.
1
2
3
4
8
7
6
5
UTC
UC3842B/3843B
COMP
VFB
ISENSE
RT/CT
GND
OUTPUT
VC
VREF
A
E/A
ADJUST
1K
4.7K
ISENSE
ADJUST
5K
4.7K
2N
2222
RT
100K
CT
0.1
0.1
OUTPUT
1K/1W
V1
VREF
Under Voltage Lockout
Under-Voltage Lock-Out: the output driver is biased to a high impedance state. To prevent activating the power
switch with output leakage current, pin 6 should be shunted to ground with a bleeder resistor.
Error Amp Configuration


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