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UC1108 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 UC1108
기능 LOW-POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER
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UC1108 데이터시트, 핀배열, 회로
UNISONIC TECHNOLOGIES CO., LTD
UC1108
Preliminary
LOW-POWER OFF-LINE
PRIMARY SIDE REGULATION
CONTROLLER
DESCRIPTION
The UTC UC1108 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 UC1108 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
UC1108 achieves excellent regulation and high average efficiency, yet
meets the requirement for no-load consumption less than 30mW.
The UTC UC1108 has the built-in programmable cable voltage
drop compensation function, which make it flexible to accommodate
various cables with different gauges and lengths
The UTC UC1108 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.
FEATURES
* 30mW No-load Input Power
* Primary side control for eliminating opto-coupler and secondary
CV/CC control circuitry
* Proprietary CC tightening technique to achieve vertical CC profile
* Programmable output cable voltage drop compensation
* Compensation for external component temperature variations
* Random frequency adjustment to reduce system EMI
* Flyback topology in DCM operation
* Built-in soft start
* Over voltage protection
* Short circuit protection
ORDERING INFORMATION
Ordering Number
UC1108G-S08-R
Package
SOP-8
CMOS IC
SOP-8
Packing
Tape Reel
UC1108G-S08-R
(1)Packing Type
(2)Package Type
(3)Green Package
(1) R: Tape Reel
(2) S08: SOP-8
(3) G: Halogen Free and Lead Free
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
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UC1108 pdf, 반도체, 판매, 대치품
UC1108
Preliminary
CMOS IC
OPERATION DESCRIPTION
The UTC UC1108 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 voltage regulator provides the internal power supply VDD. For VCC and VDD external capacitors are required.
The current biasing of UTC UC1108 is adjustable by an external resistor. Internal time constants, thresholds and the
output current depend from the value of this resistor. The startup circuit activates the IC after startup and deactivates
the IC in case of UVLO.
Operating Current
The Operating current of UTC UC1108 is as low as 400uA. 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
UC1108 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)
WhereV indicates the drop voltage of the output diode.
Figure2. 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.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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UC1108 전자부품, 판매, 대치품
UC1108
Preliminary
TYPICAL APPLICATION CIRCUIT (5V/1A)
CMOS IC
BOM
Reference
BD1
L1
C1
C2
C3
C4
C5
C6
D1,D2
D3
R1
Component
BD 1A/600V
Inductor, com-choke
EC 4.7u F 400V 105°C
EC 4.7u F 400V 105°C
CC 2.2u F 50V 105°C
CC 0.47u F 50V 0805
CC 1n F 1000V 1206
EC 1000u F 10V 105°C
Diode UTC 1N4007
Diode UTC SB340
R 2.4K1206 ±5%
Reference
R2
R3
R4
R5
R6
R7
R8
R9
T1
F1
Q1
Component
R 6.8M1206 ±5%
R 6.8M1206 ±5%
R 30K0805 ±1%
R 9.1K0805 ±1%
R 27K0805 ±5%
R 200K0805 ±5%
R 1.01206 ±5%
R 200K1206 ±5%
EE-16
FUSE 1A 250VAC
NPN Transistor UTC MJE13003
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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