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PDF USRB02 Data sheet ( Hoja de datos )
| Número de pieza | USRB02 | |
| Descripción | HIGH PRECISION CC/CV PRIMARY SIDE SWITCH | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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UNISONIC TECHNOLOGIES CO., LTD
USRB02
Preliminary
LINEAR INTEGRATED CIRCUIT
HIGH PRECISION CC/CV
PRIMARY SIDE SWITCH
DESCRIPTION
The UTC USRB02 is a primary controller for charger and
adapter applications. The controlled variable is transferred by an
auxiliary winding from the secondary to the primary side. The
device operates in Pulse Frequency Modulation (PFM) in CC
mode as well at large load condition and it operates in Pulse
Width Modulation (PWM) with frequency reduction at
light/medium load condition.
The UTC USRB02 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 USRB02 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.
SOP-8
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
* Built-in power NPN
* Multi-mode operation for efficiency improving
* Programmable cable drop compensation
* Built-in leading edge blanking
* Built-in primary winding inductance compensation
* Built-in line voltage compensation
* Audio noise free operation
* Open circuit protection
* Output over voltage protection
* VDD over voltage protection
* Short circuit protection
* Over temperature protection
ORDERING INFORMATION
Ordering Number
USRB02G-S08-R
USRB02G-S08-R
(1)Packing Type
(2)Package Type
(3)Green Package
Package
SOP-8
Packing
Tape Reel
(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
1 of 7
QW-R103-087.a
1 page  
USRB02
Preliminary
OPERATION DESCRIPTION (Cont.)
Vout
`LINEAR INTEGRATED CIRCUIT
Large
Rcs
Small
Rcs
Iout
Figure3. Adjustable output power by changing Rcs
Figure4. Secondary current waveform
In CC operation, the CC loop control function of UTC USRB02 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 USRB02 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. 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 USRB02. 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-R103-087.a
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet USRB02.PDF ] | |
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