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UC1100 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 UC1100
기능 LOW-POWER HIGH PRECISION CC/CV PRIMARY SIDE SWITCHING REGULATOR
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UC1100 데이터시트, 핀배열, 회로
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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QW-R129-007.a




UC1100 pdf, 반도체, 판매, 대치품
UC1100
Preliminary
CMOS IC
OPERATION DESCRIPTION
The UTC UC1100 is a primary control unit for switch mode charger and adapter applications. It operates in
primary-side sensing and regulation. Opto-coupler and TL431 could be eliminated. Proprietary built-in CV and CC
control can achieve high precision CV/CC performance. It uses Pulse Frequency Modulation (PFM) method to build
discontinuous conduction mode (DCM) flyback power supplies.
Startup control
The VCC pin of UTC UC1100 is connected to the line input through a resistor. A large value startup resistor can be
used to minimize the power loss in application because the start current of UTC UC1100 is very low. When the VCC
voltage reaches VTH (ST), the internal startup circuit is disabled and the IC turns on.
Operating Current
The Operating current of UTC UC1100 is as low as 320uA. Good efficiency and very low standby power can be
achieved.
Constant Voltage Operation
The output voltage is defined by the transmission ratio between the secondary and auxiliary winding. The UTC
UC1100 captures the auxiliary winding feedback voltage at FB pin and operates in constant-voltage (CV) mode to
regulate the output voltage. The auxiliary voltage reflects the output voltage is given by:
VAUX
=
NA
NS
×VO
+
V
(1)
Where V indicates the drop voltage of the output diode.
Figure1. Auxiliary voltage waveform
Via a resistor divider connected between the auxiliary winding and FB, the VAUX is sampled at the Tsampling end
and it is hold until the next sampling. The sampled voltage is compared with 4V reference voltage and the error is
amplified. The error amplifier output reflects the load condition and controls the Toff time to regulate the output
voltage, thus constant output voltage can be achieved.
Constant Current Operation
When the sampled voltage is below 4V reference voltage and the error amplifier output reaches its maximum, thus
UTC UC1100 operates in constant-current (CC) mode. The CC point and maximum output power can be externally
adjusted by external current sense resistor Rcs. The larger Rcs, the smaller CC point is, and the smaller output
power becomes.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R129-007.a

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