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PDF UPSS1650 Data sheet ( Hoja de datos )
| Número de pieza | UPSS1650 | |
| Descripción | HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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UNISONIC TECHNOLOGIES CO., LTD
UPSS1650
Preliminary
HIGH PRECISION CC/CV
PRIMARY-SIDE PWM POWER
SWITCH
CMOS IC
DESCRIPTION
The UTC UPSS1650 is a primary control 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 UPSS1650 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 UPSS1650 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.
DIP-8
SOP-8
FEATURES
* Built-in 600V Power MOSFET
* ±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
* Built-in leading edge blanking
* Built-in primary winding inductance
compensation
* Power on soft start
* 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
UPSS1650L-D08-T
UPSS1650G-D08-T
UPSS1650L-S08-R
UPSS1650G-S08-R
Package
DIP-8
SOP-8
Packing
Tube
Tape Reel
UPSS1650L-D08-T
(1)Packing Type
(2)Package Type
(3)Halogen Free
(1) T: Tube, R: Tape Reel
(2) D08: DIP-8, S08: SOP-8
(3) L: Lead Free, G: Halogen Free
www.unisonic.com.tw
Copyright © 2013 Unisonic Technologies Co., Ltd
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QW-R502-947.d
1 page  
UPSS1650
Preliminary
CMOS IC
OPERATION DESCRIPTION
The UTC UPSS1650 is a primary control 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.
Startup control
The VDD pin of UTC UPSS1650 is connected to the line input through a resistor. A large value startup resistor can
be used to minimize the power loss in application because the start current of UTC UPSS1650 is very low. 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 UPSS1650 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
UPSS1650 captures the auxiliary winding feedback voltage at INV 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.
Figure 2. Auxiliary voltage waveform
Via a resistor divider connected between the auxiliary winding and INV, the VAUX is sampled at the Tsampling end
and it is hold until the next sampling. The sampled voltage is compared with 2.0V 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 2.0V reference voltage and the error amplifier output reaches its maximum,
thus UTC UPSS1650 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
5 of 7
QW-R502-947.d
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| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet UPSS1650.PDF ] | |
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