CAT4101 Datasheet, PDF (1/10 Pages) ON Semiconductor – 1 A Constant-Current LED Driver with PWM Dimming

CAT4101
1 A Constant-Current LED
Driver with PWM Dimming
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 150°C.
The device is available in a high−power, 5−lead TO−263 package
offering excellent thermal dissipation characteristics.
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
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
• High Power LED up to 1 A
• Architectural and General Lighting
• Automotive Lighting
VCC
3 V to 25 V
LEDs
1A
VIN
5V
VIN
CAT4101
OFF _ON
EN/PWM LED
549 W
RSET
GND
Figure 1. Typical Application Circuit
http://onsemi.com
TO−263
TV SUFFIX
CASE 221AE
PIN CONNECTIONS
1
EN/PWM
VIN
GND
TAB
RSET
LED
(Top View)
MARKING DIAGRAM
CAT4101TV
3LYMXXXXA
CAT4101TV = Specific Device Code
3 = Lead Finish (Matte−Tin)
L = Assembly Location Code
Y = Production Year (Last Digit)
M = Production Month (1−9, A, B, C)
XXXX = Last Four Digits of Assembly Lot Number
A = Production Revision (Fixed as “A”)
ORDERING INFORMATION
Device
CAT4101TV−T75
(Note 1)
Package
TO−263
(Pb−Free)
Shipping
750/
Tape & Reel
1. Lead Finish Matte−Tin
© Semiconductor Components Industries, LLC, 2010
1
February, 2010 − Rev. 4
Publication Order Number:
CAT4101/D