LT3496I 데이터 시트보기 (PDF) - Linear Technology

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LT3496I

Triple Output LED Driver

Linear Technology 

LT3496

Pin Functions

PWM1, PWM2, PWM3: Pulse Width Modulated Inputs.

Signal low turns off the respective converter, reduces

quiescent supply current and causes the VC pin for that

converter to become high impedance. PWM pin must not

be left floating; tie to VREF if not used.

VREF: Reference Output Pin. Can supply up to 200µA. The

nominal Output Voltage is 2V.

CTRL1, CTRL2, CTRL3: LED Current Adjustment Pins. Sets

voltage across external sense resistor between CAP and

LED pins of the respective converter. Setting CTRL voltage

to be less than 1V will control the current sense voltage to

be one-tenth of CTRL voltage. If CTRL voltage is higher than

1V, the default current sense voltage is 100mV. The CTRL

pin must not be left floating.

fADJ: Switching Frequency Adjustment Pin. Setting fADJ

voltage to be less than 1V will adjust switching frequency

up to 2.1MHz. If fADJ voltage is higher than 1V, the default

switching frequency is 2.1MHz. The fADJ pin must not be

left floating.

VC1, VC2, VC3: Error Amplifier Compensation Pins. Con-

nect a series RC from these pins to GND.

OVP1, OVP2, OVP3: Open LED Protection Pins. A voltage

higher than 1V on OVP turns off the internal main switch

of the respective converter. Tie to ground if not used.

TG1, TG2, TG3: The Gate Driver Output Pins for Dis-

connnect P‑Channel MOSFETs. One for each converter.

When the PWM pin is low, the TG pin pulls up to CAP to

turn off the external MOSFET. When the PWM pin is high,

the external MOSFET turns on. Respective CAP-TG is

limited to 6.5V to protect the MOSFET. Leave open if the

external MOSFET is not used.

LED1, LED2, LED3: Noninverting Inputs of Current Sense

Error Amplifiers. Connect directly to LED current sense

resistor terminal for current sensing of the respective

converter

CAP1, CAP2, CAP3: Inverting Inputs of Current Sense Error

Amplifiers. Connect directly to other terminal of LED current

sense resistor terminal of the respective converter.

SW1, SW2, SW3: Switch Pins. Collector of the internal

NPN power switch of the respective converter. Connect

to external inductor and anode of external Schottky recti-

fier of the respective converter. Minimize the metal trace

area connected to this pin to minimize electromagnetic

interference.

VIN: Input Supply Pin. Must be locally bypassed. Powers

the internal control circuitry.

SHDN: Shutdown Pin. Used to shut down the switching

regulator and the internal bias circuits for all three convert-

ers. Tie to 1.5V or greater to enable the device. Tie below

0.4V to turn off the device.

Exposed Pad: Signal Ground and Power Ground. Solder

paddle directly to ground plane.

3496ff



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