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PDF UPSR104 Data sheet ( Hoja de datos )
| Número de pieza | UPSR104 | |
| Descripción | HIGH PRECISION CC/CV PRIMARY-SIDE PWM CONTROLLER | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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UNISONIC TECHNOLOGIES CO., LTD
UPSR104
Preliminary
HIGH PRECISION CC/CV
PRIMARY-SIDE PWM
CONTROLLER
DESCRIPTION
The UTC UPSR104 is a primary controller 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 UPSR104 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 UPSR104 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.
CMOS IC
65 4
1 23
SOT-26
FEATURES
* ±5% Constant Voltage Regulation at Universal AC input
* Built-in Primary winding inductance
* High Precision Constant Current Regulation at Universal AC input compensation
* Primary-side Sensing and Regulation Without TL431 and
* Programmable Cable drop Compensation
Opto-coupler
* Power on Soft-start
* Programmable CV and CC Regulation
* Built-in Leading Edge Blanking (LEB)
* Adjustable Constant Current and Output Power Setting
* Cycle-by-Cycle Current Limiting
* Built-in Secondary Constant Current Control with Primary Side * VDD Under Voltage Lockout with Hysteresis
Feedback
(UVLO)
* Built-in Adaptive Current Peak Regulation
* VDD OVP
* VDD Clamp
ORDERING INFORMATION
Ordering Number
UPSR104G-AG6-R
Package
SOT-26
Packing
Tape Reel
www.unisonic.com.tw
Copyright © 2016 Unisonic Technologies Co., Ltd
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QW-R103-113.a
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UPSR104
Preliminary
OPERATION DESCRIPTION (Cont.)
Adjustable Output Power By Changing Rcs
Vout
Large
Rcs
Small
Rcs
CMOS IC
Iout
Secondary Current Waveform
Is
Ipks
Iout
Tdemag
Tsw
t
In CC operation, the CC loop control function of UTC UPSR104 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
=
1
2
(2)
Iout
=
1
2
×
NP
NS
×Ipk ×
Tdemag
Tsw
=
1
4
×
NP
NS
×Ipk
(3)
Programmable Cable Drop Compensation
UTC UPSR104 has a built-in cable voltage drop compensation to achieve good load regulation. An offset voltage
is generated at INV pin by an internal current flowing into the resistor divider. The current is inversely proportional to
the voltage of COMP pin. As a result, it is inversely proportional to the output load current. The voltage drop across
the cable is compensated by this offset voltage at INV pin. It can also be programmed by adjusting the resistance of
the divider to compensate the drop for various cable lines used.
Current Sensing and Leading Edge Blanking
Cycle-by-cycle current limiting is offered in UTC UPSR104. 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 600ns leading-edge
blanking is built in to avoid false-termination of the switching pulse so that the external RC filtering is no longer
needed.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet UPSR104.PDF ] | |
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