UC3500G-XX-AB3-R UTC [Unisonic Technologies], UC3500G-XX-AB3-R Datasheet - Page 7

• Manufacturer Part Number: UC3500G-XX-AB3-R
• Description: HIGH EFFICIENCY VFM CONTROLLED STEP-UP DC/DC CONVERTER
• Manufacturer: UTC [Unisonic Technologies]

UC3500
oscillator, V
network. In T
maximum on time set to 2.5µs. In T
process is continuously performed to ensure stable output voltage. Until the output voltage reaches the expected
value.
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.
The UTC UC3500 consists of a Band-Gap reference voltage source, error amplifier, VFM control logic core,
The device compares the Band-Gap reference voltage with the feedback voltage from the output through divider
Therefore, in case of light load, the device works in PFM mode. In heavy load condition, the device works in
PRINCIPLE OF OPERATION
LX
UNISONIC TECHNOLOGIES CO., LTD
ON
limiter amplifier, N-channel MOSFET switching transistor and output voltage divider network.
www.unisonic.com.tw
phase, the energy is transferred from the battery to the inductor. The switch is turned off after a
OFF
phase, the energy stored in the inductor is transferred to the load. This
CMOS IC
QW-R502-072.D
7 of 12