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PDF UPSRB01A Data sheet ( Hoja de datos )
| Número de pieza | UPSRB01A | |
| Descripción | HIGH PRECISION CC/CV PRIMARY SIDE SWITCHING REGULATOR | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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UNISONIC TECHNOLOGIES CO., LTD
UPSRB01A
Preliminary
LINEAR INTEGRATED CIRCUIT
HIGH PRECISION CC/CV
PRIMARY SIDE SWITCHING
REGULATOR
DESCRIPTION
The UTC UPSRB01A 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 UPSRB01A 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 UPSRB01A 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, 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
* 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
UPSRB01AG-AG6-R
Package
SOT-26
Packing
Tape Reel
UPSRB01AG-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 © 2015 Unisonic Technologies Co., Ltd
1 of 7
QW-R103-095.a
1 page  
UPSRB01A
Preliminary
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 UPSRB01A 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)
Current Sensing and Leading Edge Blanking
Cycle-by-cycle current limiting is offered in UTC UPSRB01A. 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 7
QW-R103-095.a
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| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet UPSRB01A.PDF ] | |
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