TL4242_09 Datasheet, PDF (2/14 Pages) Texas Instruments – ADJUSTABLE LED DRIVER

TL4242
SLVS641A – APRIL 2008 – REVISED MAY 2009 .............................................................................................................................................................. www.ti.com
TERMINAL FUNCTIONS
NO.
NAME
DESCRIPTION
1
PWM Pulse-width modulation input. If not used, connect to I.
2
ST Status output. Open-collector output. Connect to an external pullup resistor (R_PULLUP ≥ 4.7 kΩ).
3
GND Ground
4
REF Reference input. Connect to a shunt resistor.
5
D Status delay. To set status reaction delay, connect to GND with a capacitor. If no delay is needed, leave open.
6
Q Output
7
NC No internal connection
8
I
Input. Connect directly to GND as close as possible to the device with a 100-nF ceramic capacitor.
Thermal
Pad
The thermal pad must be soldered directly to the PCB. It may be connected to ground or left floating.
FUNCTIONAL BLOCK DIAGRAM
I8
PWM ¹
Bias Supply
+
−
Bandgap
Reference
6Q
4 _REF
Comparator
Status
Delay
2 _ST
3
5
GND
D
2
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