ACE728E

42V Input Standoff Voltage, Step-Down LED Driver

VER 1.1

1

Description

The ACE728E is a wide input range, high-efficiency, and high frequency DC-to-DC step-down LED driver,

capable of delivering up to 1.5A of output current. ACE728E provide 0.15V feedback voltage, which

minimize the power loss on the sense resistor in a LED driver system. With a fixed switching frequency of

600KHz, This current mode PWM controlled LED Driver allows the use of small external components,

such as ceramic input and output caps, as wel as small inductors. ACE728E also employs a proprietary

control scheme that switches the device into a power save mode during light load, thereby extending the

range of high efficiency operation. An OVP function protects the IC itself and its downstream system

against input voltage surges. With the hysteresis, EN can be controlled by the ambient light-sensitive

resistor.

ACE728E is available in a space-saving SOT23-6 package.

Features

 Wide Input Operating Range from 4.5V to 38V

 Standoff Input Voltage: 42V

 High Efficiency PFM mode at light load

 Capable of Delivering 1.5A

 No External Compensation Needed

 Current Mode control

 Logic Control Shutdown

 En can be controlled by ambient light

 Thermal shutdown and UVLO

 Available in SOT23-6 Package

Application

 IR LED driver for surveillance camera

 LED lighting

 Constant current source

Absolute Maximum Rating

Parameter

Value

IN Voltage

–0.3V to 42V

SW ,EN Voltage

–0.3V to VIN+0.3

BST Voltage

–0.3V to SW+6V

FB Voltage

–0.3V to 6V

SW to ground current

Internally limited

Operating Temperature Range

–40°C to 85°

Storage Temperature Range

.–55°C to 150°C

Thermal Resistance

SOT23-6

220

110

°C/W

(Note: Exceeding these limits may damage the device. Exposure to absolute maximum rating conditions for long periods may affect device reliability.)