UNISONIC TECHNOLOGIES CO., LTD
USL250X CMOS IC
www.unisonic.com.tw 1 of 8
Copyright © 2019 Unisonic Technologies Co., Ltd QW-R103-155.C
HIGH PRECISION
NON-ISOLATED POWER
SWITCH
DESCRIPTION
USL250X offers comprehensive protection coverage with
auto-recovery features including LED string short circuit protection,
cycle-by-cycle current limiting, built-in leading edge blanking, V
DD
under voltage lockout (UVLO), over temperature protection(OTP),
etc.
Cycle-by-Cycle current limiting is offered in USL250X. The
switch current is detected by a sense resistor into the CS pin. An
internal leading edge blanking circuit chops off the sensed voltage
spike at initial power MOSFET on state so that the external RC
filtering on sense input is no longer needed.
It is a high current precision, non-isolated power switch for LED
lighting. It works under transition mode. The LED lighting system
design by eliminating the auxiliary winding inductance and works
under low current. A 500V power switch is also integrated into the
device. The LED current can be adjusted externally by the sense
resistor Rs at CS pin and high precision constant current
regulation is realized.
FEATURES
DIP-8
SOP-8
* High precision constant current regulation at universal
AC input
* Support system application with PF>0.7 and no flicking
* Sense and supply without auxiliary winding inductance
* Low system cost and high efficiency
* Low operation current
* Programmable CC regulation
* Transition mode operation
* LED string short circuit protection
* Cycle-by-Cycle current limiting
* Built-in Leading Edge Blanking (LEB)
* V
DD
Under Voltage Lockout with Hysteresis
* Over temperature protection (OTP)
ORDERING INFORMATION
Ordering Number
Package
Packing
Lead Free
Halogen Free
USL2500L-S08-R
USL2500G-S08-R
SOP-8
Tape Reel
USL2502L-D08-T
USL2502G-D08-T
DIP-8
Tube
USL250XG-S08-R
(1)Packing Type
(2)Package Type
(1) R: Tape Reel, T: Tube
(2) S08: SOP-8, D08: DIP-8
(3) G: Halogen Free and Lead Free, L: Lead Free
(3)Green Package
(4) refer to ORDERING INFORMATION
(4)Product Code
USL250X CMOS IC
UNISONIC TECHNOLOGIES CO., LTD 2 of 8
www.unisonic.com.tw QW-R103-155.C
MARKING
UTC
□
□
USL
250
X
2
3
4
1
5
6
7
8
Date Code
L: Lead Free
G: Halogen Free
Lot Code
Product Code
PIN CONFIGURATION
1
GND
CS
DRAIN
NC
DRAIN
V
DD
2
3
4 5
6
7
8
NC
GND
PIN DESCRIPTION
PIN NO.
PIN NAME
DESCRIPTION
1
CS
Current sensing terminal
2
NC
No Connection
3
V
DD
Power supply Input
4
NC
No connection
5
Drain
MOSFET Drain Terminal
6
Drain
MOSFET Drain Terminal
7
GND
Power Ground, suggest to be left floating with no pad in PCB layout.
8
GND
Power Ground, suggest to be left floating with no pad in PCB layout.