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PT4121 Datasheet

Step-down High Brightness LED Controller

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PT4121
60VStep-down High Brightness
LED Controller with 2500:1 Dimming
GENERAL DESCRIPTION
The PT4121 is a high efficiency step-down
controller.It is designed to operate in continuous
conduction mode and drive single or multiple
series connected LED efficiently from a voltage
source higher than the total LED chain voltage. It
operates with a wide input voltage from 6V to 60V
and provides an externally adjustable output
current.
The PT4121 includes a high-side output current
sense circuit, which uses an external resistor to set
the nominal average output current, and a
dedicated DIM input accepts either a DC voltage or
PWM dimming.
The PT4121 is available in SOT23-6 packages.
FEATURES
Simple low parts count
Wide input voltage range: 6V to 60V
High efficiency (up to 97%)
Single pin on/off and brightness control using
DC Voltage or PWM
Up to 1MHz switching frequency
Adjustable Constant LED Current
Typical 3% output current accuracy
High-Side Current Sense
Hysteretic Control: No need compensation
Inherent RCS open protection
Inherent open-circuit LED protection
Inherent short-circuit LED protection
Thermal shutdown
APPLICATIONS
Low voltage halogen replacement LEDs
Automotive/Decorative lighting
Low voltage industrial lighting
LED back-up lighting
Signs/Emergency lighting
SELV lighting
LCD TV backlighting
ORDERING INFORMATION
PACKAGE
SOT23-6
TEMPERATURE
RANGE
-40 oC to 85 oC
ORDERING PART
NUMBER
PT4121E23F
TYPICAL APPLICATION CIRCUIT
TRANSPORT
MEDIA
Tape and Reel
3000 units
MARKING
4121
VIN
6.0V~60V
D1
CIN Rcs
VIN CSN
VCC PT4121
DIM DRV
GND
L1
CR POWTECH (SHANGHAI) CO., LTD.
PT4121_DS_Rev EN 0.1
WWW.CRPOWTECH.COM
Page 1


Part Number PT4121
Description Step-down High Brightness LED Controller
Maker PowTech
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PT4121 Datasheet PDF






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