CAT4101TV-T75 Datasheet, PDF (1/11 Pages) ON Semiconductor – 1 A Constant-Current LED Driver with PWM Dimming

CAT4101
1 A Constant-Current LED Driver with PWM Dimming
FEATURES
„ Accurate 1 A current sink
„ Up to 25 V operation on LED pin
„ Low dropout 500 mV at 1 A
„ LED current set by external resistor
„ High resolution PWM dimming via EN/PWM
„ “Zero” current Shutdown mode
„ Thermal shutdown protection
„ TO-263 5-lead package
APPLICATIONS
„ High Power LED up to 1 A
„ Architectural and General Lighting
„ Automotive Lighting
ORDERING INFORMATION
Part
Number
Package
Quantity
per Reel
Package
Marking
CAT4101TV-T75 TO-263-5* 750 CAT4101TV
* Lead Finish Matte-Tin
DESCRIPTION
The CAT4101 is a constant-current sink driving a string of
high-brightness LEDs up to 1 A with very low dropout of
0.5 V at full load. It requires no inductor, provides a low
noise operation and minimizes the number of
components. The LED current is set by an external
resistor connected to the RSET pin. The LED pin is
compatible with high voltage up to 25 V, allowing the
driving of long strings of LEDs. The device ensures an
accurate and regulated current in the LEDs independent
of supply and LED forward voltage variation.
The PWM/EN input allows the device shutdown and the
LED brightness adjustment by using an external pulse
width modulation (PWM) signal.
The driver features a thermal shutdown protection
that becomes active whenever the die temperature
exceeds 150ºC.
The device is available in a high-power, 5-lead TO-263
package offering excellent thermal dissipation
characteristics.
PIN CONFIGURATION
Top View
EN/PWM 1
VIN 2
GND 3
RSET 4
LED 5
TYPICAL APPLICATION CIRCUIT
VCC
3V to 25V
LEDs
1A
VIN
5V
VIN
CAT4101
Tab
OFF ON
EN/PWM LED
549Ω
RSET
GND
© 2009 SCILLC. All rights reserved.
1
Characteristics subject to change without notice
Doc. No. MD-5036, Rev. D