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PDF US3602 Datasheet ( Hoja de datos )

Número de pieza US3602
Descripción HIGH PRECISION PSR CONSTANT CURRENT LED DRIVER
Fabricantes Unisonic Technologies 
Logotipo Unisonic Technologies Logotipo

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US3602 Hoja de datos, Descripción, Manual
UNISONIC TECHNOLOGIES CO., LTD
US3602
Preliminary
HIGH PRECISION PSR
CONSTANT CURRENT
LED DRIVER
CMOS IC
DESCRIPTION
The UTC US3602 is a primary side control offline LED lighting
controller. It operates in inductor current DCM mode and can
achieve accurate constant current.
The UTC US3602 integrates 600V power MOSFET and
simplifies the LED lighting system design by eliminating the
secondary side feedback components and the opto-coupler. The
loop compensation components are also removed while
maintaining stability overall operating conditions.
The LED current can be adjusted externally by the sense
resistor RCS at CS pin. The UTC US3602 achieves ±3% accuracy
of LED current along with excellent line regulation and load
regulation.
The UTC US3602 offers comprehensive protection coverage
with auto-recovery features including LED short circuit protection,
LED open circuit protection, Cycle-by-cycle current limiting, OTP,
VCC over voltage protection, leading edge blanking, VCC under
voltage lockout, etc.
FEATURES
* Built-in 600V Power MOSFET
* ±3% constant current regulation at universal AC input
* Primary side control without TL431 and opto-coupler
* Programmable CC regulation
* Flyback topology in DCM operation
* Low operating current to improve efficiency
* High resistance feedback resistor to improve efficiency
* LED short and open circuit protection
* Cycle-by-cycle current limiting
* Built-in leading edge blanking
* VCC over voltage protection
* VCC under-voltage lockout
* Feedback loop short circuit protection
* Current sense resistor open circuit protection
ORDERING INFORMATION
Ordering Number
US3602G-S08-R
Package
SOP-8
Packing
Tape Reel
US3602G-S08-R
(1)Packing Type
(2)Package Type
(3)Green Package
(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-R502-985.b

1 page

US3602 pdf
US3602
Preliminary
CMOS IC
FUNCTION DESCRIPTION
The UTC US3602 is a primary side control offline LED lighting controller. It operates in inductor current DCM
mode and can achieve accurate constant current. The UTC US3602 integrates 600V power MOSFET and simplifies
the LED lighting system design by eliminating the secondary side feedback components and the opto-coupler. The
loop compensation components are also removed while maintaining stability overall operating conditions.
Startup control
The VCC pin of UTC US3602 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 US3602 is very low. When the VCC
voltage reaches VTH(ON), the internal startup circuit is disabled and the IC turns on.
Operating Current
The operating current of UTC US3602 is as low as 1mA. Good efficiency and very low standby power can be
achieved.
Constant Current Operation
When the FB voltage is over 1.2V reference voltage and the demagnetization time is lager than 4µS, thus UTC
US3602 operates in constant-current (CC) mode. The CC point can be externally adjusted by external current sense
resistor RCS.
In CC operation, the CC loop control function of UTC US3602 will keep a fixed proportion between secondary
inductance demagnetization time (Tdemag) and switching cycle time (Tsw). The fixed proportion is
Tdemag
Tsw
=
1
2
Thus the output current is given by:
Iout
=
1
2
×
NP
NS
×Ipk ×
Tdemag
Tsw
=
1
4
×
NP
NS
×Ipk
Figure4. Secondary current waveform
Current Sensing and Leading Edge Blanking
Cycle-by-cycle current limiting is offered in UTC US3602. 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.
Programmable Line Voltage Compensation
UTC US3602 has a built-in line voltage compensation to achieve good line regulation. An offset voltage is
generated at CS pin by a sense current from upper resistor at FB pin. The current is inversely proportional to the
upper resistor and is proportional to the line voltage. So the line voltage is compensated by this offset voltage at CS
pin. It can also be programmed by adjusting the resistance of the divider for various line voltage used.
The ratio of line compensation can be calculated by the equation:
VCS
=
-1.1 ×106
×
VAUX
RFBH
(mV )
Where, RFBH is the upper resistor of the FB pin.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 7
QW-R502-985.b

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