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UC2843BG-D08-T Datasheet(PDF) 6 Page - Unisonic Technologies

No. de pieza UC2843BG-D08-T
Descripción Electrónicos  HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
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Fabricante Electrónico  UTC [Unisonic Technologies]
Página de inicio  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UC2843BG-D08-T Datasheet(HTML) 6 Page - Unisonic Technologies

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UC2843B
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
6 of 8
www.unisonic.com.tw
QW-R103-048.D
APPLICATION INFORMATION(Cont.)
Open-Loop Laboratory Test Fixture
In the open-loop laboratory test fixture, high peak currents and loads need grounding techniques. The transistor
and 5-kΩ potentiometer sample the oscillator waveform, applying an adjustable ramp to the ISENSE terminal. Timing
and bypass capacitors should be connected closely to the GND terminal in a single-point ground.
Shutdown Technique
The PWM controller can be shut down through two methods: the one is raising voltage (above 1 V) at ISENSE, the
other is pulling the COMP terminal below a voltage two diode drops above ground. Either method can leave the
output of the PWM comparator high (refer to block diagram). To reset the PWM latch is dominant so the output can
stay low in the case of the next clock cycle is coming and the COMP or ISENSE terminal is removed beyond this
shutdown condition. For example, an externally-latched shutdown can be accomplished by adding an SCR reset by
cycling VCC below the lower UVLO threshold. So the reference turns off then allows the SCR to reset at this
condition.
VREF
ISENSE
330Ω
1kΩ
500Ω
To Current-Sense
Resistor
Shutdown
COMP


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