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PDF UPSRB01 Data sheet ( Hoja de datos )
| Número de pieza | UPSRB01 | |
| Descripción | HIGH PRECISION CC/CV PRIMARY SIDE SWITCHING REGULATOR | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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UNISONIC TECHNOLOGIES CO., LTD
UPSRB01
LINEAR INTEGRATED CIRCUIT
HIGH PRECISION CC/CV
PRIMARY SIDE SWITCHING
REGULATOR
DESCRIPTION
The UTC UPSRB01 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 UPSRB01 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 UPSRB01 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, VDD over voltage
protection, feedback loop open protection, short circuit protection,
leading edge blanking, OTP, VDD under voltage lockout, etc.
54
6
1 23
SOT-26
FEATURES
* ±5% constant voltage regulation at universal AC input
* Primary side control without TL431 and opto-coupler
* High precision constant current regulation at universal AC input
* Programmable CV and CC regulation
* Eliminates control loop compensation circuitry
* Flyback topology in DCM operation
* Random frequency modulation to reduce system EMI
* Driver BJT switch
* Programmable cable drop compensation
* Built-in leading edge blanking
* Built-in primary winding inductance
compensation
* Open circuit protection
* Output over voltage protection
* VDD over voltage protection
* Short circuit protection
* Over temperature protection
ORDERING INFORMATION
Ordering Number
UPSRB01G-AG6-R
Package
SOT-26
Packing
Tape Reel
UPSRB01G-AG6-R
(1)Packing Type
(2)Package Type
(3)Green Package
(1) R: Tape Reel
(2) AG6: SOT-26
(3) G: Halogen Free and Lead Freee
www.unisonic.com.tw
Copyright © 2014 Unisonic Technologies Co., Ltd
1 of 6
QW-R103-078.A
1 page  
UPSRB01
OPERATION DESCRIPTION (Cont.)
LINEAR INTEGRATED CIRCUIT
Figure3. Adjustable output power by changing RCS
Figure4. Secondary current waveform
In CC operation, the CC loop control function of UTC UPSRB01 will keep a fixed proportion between secondary
inductance de-magnetization time (Tdemag) and switching cycle time (Tsw). The fixed proportion is
Tdemag
TSW
=
1
2
(2)
Thus the output current is given by:
Iout
=
1
2
×
NP
NS
× IPK
×
Tdemag
TSW
=
1
4
×
NP
NS
× IPK
(3)
Programmable Cable drop Compensation
UTC UPSRB01 has a built-in cable voltage drop compensation to achieve good load regulation. An offset voltage
is generated at FB pin by an internal current flowing into the resistor divider. The current is inversely proportional to
the voltage of VC 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 FB 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 UPSRB01. 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 500ns 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
5 of 6
QW-R103-078.A
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| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet UPSRB01.PDF ] | |
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