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UC3500L-XX-AB3-R Scheda tecnica(PDF) 7 Page - Unisonic Technologies

Il numero della parte UC3500L-XX-AB3-R
Spiegazioni elettronici  HIGH EFFICIENCY VFM CONTROLLED STEP-UP DC/DC CONVERTER
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Produttore elettronici  UTC [Unisonic Technologies]
Homepage  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UC3500L-XX-AB3-R Scheda tecnica(HTML) 7 Page - Unisonic Technologies

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UC3500
CMOS IC
UNISONICTECHNOLOGIESCO.,LTD
7 of 11
www.unisonic.com.tw
QW-R502-072.E
PRINCIPLE OF OPERATION
The UTC UC3500 consists of a Band-Gap reference voltage source, error amplifier, VFM control logic core,
oscillator, VLX limiter amplifier, N-channel MOSFET switching transistor and output voltage divider network.
The device compares the Band-Gap reference voltage with the feedback voltage from the output through divider
network. In TON phase, the energy is transferred from the battery to the inductor. The switch is turned off after a
maximum on time set to 2.5µs. In TOFF phase, the energy stored in the inductor is transferred to the load. This
process is continuously performed to ensure stable output voltage. Until the output voltage reaches the expected
value.
Therefore, in case of light load, the device works in PFM mode. In heavy load condition, the device works in
continuous mode, the frequency range up to a maximum 150 KHz set by the built in oscillator. In over current
conditions, the Ton time is shorted; the switching frequency will be higher than 150 KHz.
TYPICAL APPLICATION CIRCUIT
RECONMMENDED COMPONENTS
L
D
CIN
COUT
47μH (Sunida CD54 Fosc=500kHz)
MA737, or MBRM110L
10V 4.7μF (Tantalum)
16V 47μF (Tantalum)


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