CAT4101TV-T75(2010) データシートの表示（PDF） - ON Semiconductor

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CAT4101TV-T75
(Rev.:2010)

1 A Constant-Current LED Driver with PWM Dimming

ON Semiconductor 

CAT4101

Table 5. PIN DESCRIPTIONS

Name

Pin

EN/PWM

1

VIN

2

GND

3

RSET

4

LED

5

TAB

–

Function

Device enable (active high) and PWM control.

Device supply input, connect to battery or supply.

Ground reference.

A resistor connected between this pin and ground sets the LED current.

Bottom LED cathode terminal.

Connect TAB to the Ground plane.

Pin Function

VIN is the supply pin for the device. A small 0.1 mF ceramic

bypass capacitor is optional for noisy environments. The

maximum operating voltage is 6.0 V. Whenever the input

supply falls below the under−voltage threshold, the current

sink will automatically be disabled.

EN/PWM is the enable and one wire dimming input for the

LED channel. Guaranteed levels of logic high and logic low

are set at 1.3 V and 0.4 V respectively. When EN/PWM is

initially taken high, the device becomes enabled and the

LED current is set at a gain of 400 times the current in RSET.

To place the device into zero current shutdown mode, the

EN/PWM pin must be held low for 5 ms typical.

LED pin is connected to the bottom LED cathode and

provides a regulated current sink. The pin enters a

high−impedance zero−current state whenever the device is

placed in shutdown mode.

RSET pin is connected to an external resistor to set the LED

current. The ground side of the external resistor should be

star connected to the GND of the PCB. The pin source

current mirrors the current to the LED sink. The voltage at

this pin is regulated to 1.2 V.

GND is the ground reference for the device. The pin must be

connected to the ground plane on the PCB.

TAB is the exposed pad underneath the package. For best

thermal performance, the tab should be soldered to the PCB

and connected to the ground plane.

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