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UC3843A-S08-R Datenblatt(PDF) 5 Page - Unisonic Technologies

Teilenummer UC3843A-S08-R
Bauteilbeschribung  CURRENT MODE PWM CONTROL CIRCUITS
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Hersteller  UTC [Unisonic Technologies]
Direct Link  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UC3843A-S08-R Datenblatt(HTML) 5 Page - Unisonic Technologies

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UC3842A/3843A
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
5 of 9
www.unisonic.com.tw
QW-R103-002,D
OPEN-LOOP LABORATORY TEST FIXTURE
1
2
8
7
3
6
4
5
A
VREF
Vcc
1k
/ 1W
CT
RT
5k
Error
Amp
Adjust
OUTPUT
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 5k
Ω potentio-meter are used
to sample the oscillator waveform and apply an adjustable Ramp to Pin 3.
UNDER-VOLTAGE LOCKOUT
7
Vcc
Von=16V
Voff=10V
ON/OFF Command
to rest of IC
Von
Voff
<1mA
<15mA
Icc
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.
ERROR AMPLIFIER CONFIGURATION
2
1
0.5mA
2.5V
Zf
Zi
Error amplifier can source or sink up to 0.5mA


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