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PDF UPSR1103 Data sheet ( Hoja de datos )
| Número de pieza | UPSR1103 | |
| Descripción | HIGH PRECISION CC/CV PRIMARY SIDE SWITCHING REGULATOR | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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UNISONIC TECHNOLOGIES CO., LTD
UPSR1103
Advance
HIGH PRECISION CC/CV
PRIMARY SIDE SWITCHING
REGULATOR
CMOS IC
DESCRIPTION
The UTC UPSR1103 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 integrates PWM controller to enhance the
performance of discontinuous conduction mode (DCM) flyback
converters.
The UTC UPSR1103 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 UPSR1103 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.
SOP-8
FEATURES
* High voltage startup
* ±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
* Driver MOSFET switch
* Built-in leading edge blanking
* Built-in primary winding inductance
compensation
* 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
UPSR1103L-S08-T
UPSR1103G-S08-T
Package
SOP-8
Packing
Tube
www.unisonic.com.tw
Copyright © 2013 Unisonic Technologies Co., Ltd
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UPSR1103
Advance
CMOS IC
OPERATION DESCRIPTION
The UTC UPSR1103 is a primary control unit for 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.
High-Voltage Startup control
The HV pin of UTC UPSR1103 is connected to the line input through a resistor (100K is recommended). During
startup, the internal startup circuit in UTC UPSR1103 is enabled. Meanwhile, line input supplies a constant current to
charge the hold-up capacitor through the resistor. 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 UPSR1103 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
UPSR1103 captures the auxiliary winding feedback voltage at VS 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.
Figure2. Auxiliary voltage waveform
Via a resistor divider connected between the auxiliary winding and VS, the VAUX is sampled at the Tsampling end
and it is hold until the next sampling. The sampled voltage is compared with 2.5V 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 2.5V reference voltage and the error amplifier output reaches its maximum,
thus UTC UPSR1103 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
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet UPSR1103.PDF ] | |
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