UC1100 Datasheet PDF - Unisonic Technologies
| Part Number | UC1100 | |
| Description | LOW-POWER HIGH PRECISION CC/CV PRIMARY SIDE SWITCHING REGULATOR | |
| Manufacturers | Unisonic Technologies | |
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UNISONIC TECHNOLOGIES CO., LTD
UC1100
Preliminary
CMOS IC
LOW-POWER HIGH PRECISION
CC/CV PRIMARY SIDE
SWITCHING REGULATOR
DESCRIPTION
The UTC UC1100 is a primary control unit for switch mode
charger and adapter applications. The controlled variable is
transferred by an auxiliary winding from the secondary to the
primary side. The device uses Pulse Frequency Modulation (PFM)
method to build discontinuous conduction mode (DCM) flyback
power supplies.
The UTC UC1100 operates in primary-side sensing and
regulation. Opto-coupler and TL431 could be eliminated. It also
eliminates the need of loop compensation circuitry while
maintaining stability. The UTC UC1100 achieves excellent
regulation and high average efficiency, yet meets the requirement
for no-load consumption less than 30mW.
The UTC UC1100 achieves high precision CV/CC regulation
and high power efficiency. It offers comprehensive protection
coverage with auto-recovery features including Cycle-by-cycle
current limiting, output over voltage protection, feedback loop open
protection, short circuit protection, leading edge blanking, VCC
under voltage lockout, etc.
54
6
1 23
SOT-26
FEATURES
* Primary side control for rectangular constant current and * Random frequency modulation to reduce system EMI
constant voltage output
* Flyback topology in DCM operation
* 30mW no-load input power feasible
* Open feedback protection
* Tight CC regulation performance
* Built-in soft start
* Sub-microampere start-up current
* Short circuit protection
* Eliminates control loop compensation circuitry
* Eliminates opto-coupler and secondary CV/CC control
circuitry
ORDERING INFORMATION
Ordering Number
UC1100G-AG6-R
Package
SOT-26
Packing
Tape Reel
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
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UC1100
Preliminary
OPERATION DESCRIPTION (Cost.)
CMOS IC
Figure2. Adjustable output power by changing Rcs
Figure3. Secondary current waveform
In CC operation, the CC loop control function of UTC UC1100 will keep a fixed proportion between secondary
inductance de-magnetization time (Tdemag) and switching cycle time (Tsw). The fixed proportion is
Thus the output current is given by:
Tdemag
Tsw
=
4
7
(2)
Iout
=
1
2
×
NP
NS
×Ipk ×
Tdemag
Tsw
=
2
7
×
NP
NS
×Ipk
(3)
Current Sensing and Leading Edge Blanking
Cycle-by-cycle current limiting is offered in UTC UC1100. The switch current is detected by a sense resistor into
the CS pin. When the power switch is turned on, a turn-on spike will occur on this resistor. A 750ns leading-edge
blanking is built in to avoid false-termination of the switching pulse so that the external RC filtering is no longer
needed.
Drive BJT
The driver is a push pull stage with the supply voltage VCC. It provides the driving current for the external power
bipolar transistor. The output signal is current-limited to IOUT(SOURCE).
Protection Control
Good power supply system reliability is achieved with its comprehensive protection features including output
over-voltage protection, feedback loop open protection, Cycle-by-cycle current limiting, short circuit protection,
leading edge blanking and UVLO, etc.
VCC is supplied by transformer auxiliary winding output. The output of UTC UC1100 is shutdown when VCC drops
below VOPR(MIN) and the power converter enters power on start-up sequence thereafter.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for UC1100 electronic component. |
| Information | Total 6 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ UC1100.PDF Datasheet ] | |
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| Part Number | Description | MFRS |
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