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US3652 の電気的特性と機能

US3652のメーカーはUnisonic Technologiesです、この部品の機能は「HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH」です。


製品の詳細 ( Datasheet PDF )

部品番号 US3652
部品説明 HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH
メーカ Unisonic Technologies
ロゴ Unisonic Technologies ロゴ 




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US3652 Datasheet, US3652 PDF,ピン配置, 機能
UNISONIC TECHNOLOGIES CO., LTD
US3652
Preliminary
HIGH PRECISION CC/CV
PRIMARY-SIDE PWM POWER
SWITCH
CMOS IC
DESCRIPTION
The UTC US3652 is a primary control switch mode charger and
adapter applications. The controlled variable is transferred by an
auxiliary winding from the secondary to the primary side. The
device integrates PWM controller to enhance the performance of
discontinuous conduction mode (DCM) flyback converters.
The UTC US3652 operates in primary-side sensing and
regulation. Opto-coupler and TL431 could be eliminated. It also
provides off-time modulation to linearly decrease PWM frequency
under light-load conditions so that low standby power can be
achieved.
The UTC US3652 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, VDD over voltage protection, VDD clamp, OTP,
leading edge blanking, VDD under voltage lockout, etc.
DIP-8
FEATURES
* Built-in 600V Power MOSFET
* ±5% constant voltage regulation at universal AC input
* High precision constant current regulation at universal AC input
* Primary side control without TL431 and opto-coupler
* Programmable CV and CC regulation
* Programmable cable compensation in CV mode
* Flyback topology in DCM operation
* Frequency hopping to reduce system EMI
* Built-in leading edge blanking
* Built-in primary winding inductance
compensation
* Power on soft start
* Gate Output Maximum Voltage Clamped at
15V
* Cycle-by-cycle current limiting
* Over voltage protection
* VDD under-voltage lockout
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
US3652L-D08-T
US3652G-D08-T
Package
DIP-8
Packing
Tube
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
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US3652 pdf, ピン配列
US3652
BLOCK DIAGRAM
Preliminary
CMOS IC
VDD
1
Regulator Por
& VREF
Logic core
OVP
28V
Tdemag
CC
detector controller
INV 3
CV
2V controller
Cable
compensation
2
COMP
7/8
GND
5/6 DRAIN
Drive
Power
MOSFET
Softstart
LEB
4 CS
0.9V
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
3 of 9
QW-R103-084.b


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US3652 電子部品, 半導体
US3652
Preliminary
CMOS IC
OPERATION DESCRIPTION
The UTC US3652 is a primary control 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. The device integrates PWM controller to enhance the performance of
discontinuous conduction mode (DCM) flyback converters.
Startup control
The VDD pin of UTC US3652 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 US3652 is very low. When the VDD
voltage reaches VTH(ON), the internal startup circuit is disabled and the IC turns on.
Operating Current
The Operating current of UTC US3652 is as low as 1.6mA. 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
US3652 captures the auxiliary winding feedback voltage at INV 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.
Figure 2. Auxiliary voltage waveform
Via a resistor divider connected between the auxiliary winding and INV, the VAUX is sampled at the Tsampling end
and it is hold until the next sampling. The sampled voltage is compared with 2.0V reference voltage and the error is
amplified. The error amplifier output reflects the load condition and controls the TOFF time and the Ipk to regulate the
output voltage, thus constant output voltage can be achieved.
Constant Current Operation
When the sampled voltage is below 2.0V reference voltage and the error amplifier output reaches its maximum,
thus UTC US3652 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
6 of 9
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部品番号部品説明メーカ
US3651

HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH

Unisonic Technologies
Unisonic Technologies
US3652

HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH

Unisonic Technologies
Unisonic Technologies


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