EA111AUS

EA111AUS Datasheet

Part	Datasheet
EA111AUS	EA111AUS (pdf)

Related Parts	Information
ACT111AUS-T	ACT111AUS-T

PDF Datasheet Preview
ACT111A 4.8V to 30V Input, 1.5A LED Driver with Dimming Control • Up to 92% Efficiency • Wide 4.8V to 30V Input Voltage Range • 100mV Low Feedback Voltage • 1.5A High Output Capacity • PWM Dimming • 10kHz Maximum Dimming Frequency • Thermal Shutdown • SOT23-6 Package • High Brightness LED Driver • Architecture Detail Lighting • Constant Current Source • Hand-held Lighting • Automotive RCL, DRL, and Fog Lights • Indicators and Emergency Lighting • MR16 and other LED Bulb The ACT111A is a high efficient LED driver employing current-mode buck converter topology that supplies up to 1.5A from wide input voltage range from 4.8V up to 30V. The ACT111A is designed to operate as a constant source with 1.4MHz fixed frequency. ACT111A consists of a PWM control circuit, a high precision band-gap voltage reference, an oscillator, an error amplifier with internal compensation network and the N channel power MOSFET. An external sense resistor in series with the LED monitors output current allowing accurate current regulation, ideal for driving high current LEDs. The built-in fault condition protection circuits including current limiting, UVLO and thermal shutdown prevent itself from potentially faulty operation and burn-out. The ACT111A is ideal for single 1W to 5W LED drivers. With its ultra low feedback voltage, a low current ripple, high efficiency of up to 92% stepdown power LED driver can be easily composed of with additional several external components such as an inductor, a Schottky diode, a few resistors and capacitors. TYPICAL APPLICATION CIRCUIT Innovative PowerTM Copyright 2012 Active-Semi, Inc. ORDERING INFORMATION ACT111AUS-T TEMPERATURE RANGE -40°C to 85°C PACKAGE SOT23-6 PINS PACKING TOP MARK TAPE & REEL FRWE PIN CONFIGURATION SOT23-6 ACT111AUS-T PIN DESCRIPTIONS PIN NUMBER PIN NAME PIN DESCRIPTION Feedback Input for regulating LED current. The voltage at this pin is regulated to 0.1V. An external resistor is connected from this pin to ground to sense the LED current. Ground. Bootstrap pin. This provides power to the internal high-side N channel MOSFET gate driver. Connect a 2.2nF capacitor from the pin to SW pin. Internal N channel power MOSFET source output pin. Connect it to one end of power inductor. Power supply input. Bypass this pin with a 10µF ceramic capacitor to GND, placed as close to the IC as possible. PWM signal input for dimming control. Apply PWM signal with amplitude greater than 2V to this pin. The device is enabled as DIM pin open and disabled when it is connected to G. Innovative PowerTM Copyright 2012 Active-Semi, Inc. ABSOLUTE MAXIMUM RATINGSc PARAMETER IN to GND SW to GND BST to GND FB to GND DIM to GND Continuous SW Current Junction to Ambient Thermal Resistance Maximum Power Dissipation Operating Junction Temperature Storage Temperature Lead Temperature Soldering, 10 sec VALUE to 34 -1 to VIN + 1 VSW - to VSW + 7 to + 6 to + 3 Internally Limited 220 -40 to 150 -55 to 150 300 UNIT V A °C/W °C °C °C c Do not exceed these limits to prevent damage to the device. Exposure to absolute maximum rating conditions for long periods may affect device reliability. ELECTRICAL CHARACTERISTICS VIN = 12V, TA = 25°C, unless otherwise specified. PARAMETER Input Voltage VIN Turn-On Voltage VIN UVLO Hysteresis Supply Operation Current Switching Frequency Maximum Duty Cycle Minimum On-Time Effective FB Voltage FB Leakage Current CC Current Limit PWM DIM Frequency DIM Threshold Voltage DIM Hysteresis DIM Input Leakage High-Side Switch On-Resistance Low-Side Switch On-Resistance Thermal Shutdown Temperature Thermal Hysteresis TEST CONDITIONS

PDF Datasheet Preview

ACT111A
4.8V to 30V Input, 1.5A LED Driver with Dimming Control
• Up to 92% Efficiency
• Wide 4.8V to 30V Input Voltage Range
• 100mV Low Feedback Voltage
• 1.5A High Output Capacity
• PWM Dimming
• 10kHz Maximum Dimming Frequency
• Thermal Shutdown
• SOT23-6 Package
• High Brightness LED Driver
• Architecture Detail Lighting
• Constant Current Source
• Hand-held Lighting
• Automotive RCL, DRL, and Fog Lights
• Indicators and Emergency Lighting
• MR16 and other LED Bulb

The ACT111A is a high efficient LED driver employing current-mode buck converter topology that supplies up to 1.5A from wide input voltage range from 4.8V up to 30V. The ACT111A is designed to operate as a constant source with 1.4MHz fixed frequency. ACT111A consists of a PWM control circuit, a high precision band-gap voltage reference, an oscillator, an error amplifier with internal compensation network and the N channel power MOSFET. An external sense resistor in series with the LED monitors output current allowing accurate current regulation, ideal for driving high current LEDs. The built-in fault condition protection circuits including current limiting, UVLO and thermal shutdown prevent itself from potentially faulty operation and burn-out.

The ACT111A is ideal for single 1W to 5W LED drivers. With its ultra low feedback voltage, a low current ripple, high efficiency of up to 92% stepdown power LED driver can be easily composed of with additional several external components such as an inductor, a Schottky diode, a few resistors and capacitors.

TYPICAL APPLICATION CIRCUIT

Innovative PowerTM

Copyright 2012 Active-Semi, Inc.
ORDERING INFORMATION

ACT111AUS-T

TEMPERATURE RANGE
-40°C to 85°C

PACKAGE

SOT23-6

PINS

PACKING TOP MARK

TAPE & REEL

FRWE

PIN CONFIGURATION

SOT23-6 ACT111AUS-T

PIN DESCRIPTIONS

PIN NUMBER PIN NAME

PIN DESCRIPTION

Feedback Input for regulating LED current. The voltage at this pin is regulated to
0.1V. An external resistor is connected from this pin to ground to sense the LED
current.

Ground.

Bootstrap pin. This provides power to the internal high-side N channel MOSFET gate driver. Connect a 2.2nF capacitor from the pin to SW pin.

Internal N channel power MOSFET source output pin. Connect it to one end of power inductor.

Power supply input. Bypass this pin with a 10µF ceramic capacitor to GND, placed as close to the IC as possible.

PWM signal input for dimming control. Apply PWM signal with amplitude greater
than 2V to this pin. The device is enabled as DIM pin open and disabled when it is
connected to G.

Innovative PowerTM

Copyright 2012 Active-Semi, Inc.

ABSOLUTE MAXIMUM RATINGSc

PARAMETER

IN to GND SW to GND BST to GND FB to GND DIM to GND Continuous SW Current Junction to Ambient Thermal Resistance Maximum Power Dissipation Operating Junction Temperature Storage Temperature Lead Temperature Soldering, 10 sec

VALUE
to 34 -1 to VIN + 1 VSW - to VSW + 7 to + 6 to + 3 Internally Limited
220 -40 to 150 -55 to 150 300

UNIT

V A °C/W °C °C °C
c Do not exceed these limits to prevent damage to the device. Exposure to absolute maximum rating conditions for long periods may affect device reliability.

ELECTRICAL CHARACTERISTICS

VIN = 12V, TA = 25°C, unless otherwise specified.

PARAMETER

Input Voltage VIN Turn-On Voltage VIN UVLO Hysteresis Supply Operation Current Switching Frequency Maximum Duty Cycle Minimum On-Time Effective FB Voltage FB Leakage Current CC Current Limit PWM DIM Frequency DIM Threshold Voltage DIM Hysteresis DIM Input Leakage High-Side Switch On-Resistance Low-Side Switch On-Resistance Thermal Shutdown Temperature Thermal Hysteresis

TEST CONDITIONS

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Datasheet ID: EA111AUS 522236