7023-D-N-1000 datasheet, PDF - EEWORLD Datasheet

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7023-D-N-1000: Descriptionled supply CC buck 32v 1A; Categorysemiconductor Power management; File Size311KB，8 Pages; ManufacturerLEDdynamics; Websitehttp://www.leddynamics.com

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7023-D-N-1000 Overview

led supply CC buck 32v 1A

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7021/7023 BuckPlus

Wide Range LED Power Module

DATA SHEET Page 1 of 8

Product Overview

The 7021 and 7023 BuckPlus LED Power Modules are a line of true

current regulated drivers for powering LEDs. The BuckPlus line of

LED drivers are the ideal choice for powering all types of high-

brightness and high-power LED Packages and LED arrays.

The line of BuckPlus LED drivers exhibit high efficiency and require

no external current limiting resistors or additional heat sinking for

operation. A fast response current-sensing circuit makes the 7021

and 7023 ideal for applications where flashing or strobe operation of

the LED(s) is required.

A wide range of options are available including external dc analog

voltage intensity control, TTL/CMOS logic level on/off control (”E”

Version), and set-and-forget internal current limiting (”I” Version).

The standard units are fully potted in an extremely small form factor*

and are provided with a simple 7 pin SIP connection for through-hole

PCB mounting (7021) or 6” 24AWG Colored Leads (7023).

The 7021 and 7023’s built-in regulated 5V reference (E and I versions)

can provide output to power logical circuitry or microprocessor,

eliminating the need for an additional power supply on the circuit board.

Features

DC input voltage up to 32V

350mA, 500mA, 700mA, or 1.0A constant current output*

Extremely small form factor* (0.83”x0.83”x0.43”)

The 7021 has a simple 7-pin SIP connection for through-hole

PCB mounting or use with an optional wiring harness (7021Hx)

The 7023 has permanently attached wires

External analog/digital intensity control (TTL compatible)

Optional external potentiometer intensity control (0-100%)

Optional on-board trim adjustment (40-110%)

Output short circuit protection up to 15 seconds

Output open circuit protection

Pulse and strobe capable (control input)

Built-in 5V reference/output to power logic circuitry or μProcessor

Typical Applications

Solar & Landscape Lighting

Architectural Lighting

Track Lighting

Automotive & Marine Lighting

Portable Lighting & Flashlights

Point of Purchase Lighting

Desk & Reading Lamps

Signal & marker Lighting

Flashing & Strobe Lighting

Cabinet & Display Case Lighting

Sign & Channel Letters

Much More...

7-Pin SIP through-hole

PCB mounting

Optional on-board trim

adjustment (40-110%)

* - Custom units can be designed for OEM applications. Contact LUXdrive for more information.

7021

BuckPlus

with optional

wiring harness

(7021HEP)

RoHS

C o m p lia n t

2002/95/EC

LEDdynamics, Inc.

802.728.4533 P

802.728.3800 F

sales@LUXdrive.com

www.LUXdrive.com

Specifications subject to change without notice. April, 2010 - Rev 2.2

Made

the

USA

7021/7023 BuckPlus

Wide Range LED Power Module

DATA SHEET Page 3 of 8

Specifications

Output current, 7021-x-x-350, 7023-x-x-350 . .

Output current, 7021-x-x-500, 7023-x-x-500 . .

Output current, 7021-x-x-700, 7023-x-x-700 . .

Output current, 7021-x-x-1000, 7023-x-x-1000

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 700mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000mA

Control Pin, adjustment threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.65 V ±5%

Control Pin, shutoff threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2 V ±5%

Control Pin, propagation delay to output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <15 μs

Control Pin, input impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5k ohm

Reference voltage (V

= 7V or greater) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 V

±5%

Optional trim pot adjustment range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40%-110%

External pot adjustment range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0%,1-100%

Maximum flash frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 kHz

Minimum strobe pulse width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 μs

Output rise time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <10 μs

Output fall time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <350 μs

Quiescent current (no load or control pin high) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <4.5 mA

Operating temperature (Tcase). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40-+80°C

Storage temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40-+125°C

Application Information

Description

The 7021/7023 Wide Range LED Power Module is a high efficiency dc to dc converter which delivers a fixed output

current by varying the output voltage as required to maintain the specified current . A fast response current-sensing

circuit permits the unit to be used in applications where flashing or pulsing of the LEDs is required. Several options

are available allowing for use with many types of LEDs and in a variety of operating modes

Fixed Current Drive

The fixed output versions of the 7021/7023 are designed to supply their rated current to one or more LED junctions.

For example, a 350 mA rated unit will drive up to six white 350mA LEDs connected in series at 24VDC. Due to the

nature of the buck regulator, the input voltage must always be higher than the total forward voltage drop of the

LEDjunction(s) connected in series (2.5V. Thus, for a series string of six junctions having an average forward drop of

3.5V each, the required minimum input voltage will be 21V

. A standard 24V

power supply is a good choice for this

application.

Figures 4 through 6 show 700mA and 1000mA rated units driving multiple LEDs. Note that parallel strings of LEDs

can be driven directly with no additional circuitry required to insure current sharing. The nature of the LEDs

themselves will provide sufficient current sharing if the parallel strings comprise 3 or more junctions each.

1 - Measured with single emitter; output current drops slightly with additional series junctions to limit maximum power dissipation.

2 - When Vin > 7VDC

3 - Actual value varies greatly based on input and/or output voltages. Value shown is for V

= 24V

OUTt

=20V

LED load. Actual values will be smaller in most applications.

Specifications subject to change without notice. April, 2010 - Rev 2.2

LEDdynamics, Inc.

802.728.4533 P

802.728.3800 F

sales@LUXdrive.com

www.LUXdrive.com

Made

the

USA

7021/7023 BuckPlus

Wide Range LED Power Module

DATA SHEET Page 4 of 8

Adjustable Current - On-Board Control - “I” Model

Where the ability to adjust the output current to an intermediate value is required, all output current ratings are

available with an on-board potentiometer. This permits the output current to be varied from approximately 40%

to 110% of the rated value. When measuring the output is required to determine a particular set point, the

following method is recommended:

Temporarily place a 0.1 ohm, 1% resistor in series with the LEDs.

Read the voltage across the 0.1 ohm resistor.

The voltage, in millivolts X 10, will equal the output current in mA.

Because there is a small, high-frequency component in the 7021/7023 output, many multi-meters may give an

incorrect reading when used in the current mode. It has been found that the method described above yields a far

more accurate measurement.

The potentiometers used for the on-board adjustable units are rated for a limited number of rotations (typically

100) and are intended for "set it and forget it" applications. Where frequent adjustments of output current are

needed, the use of units with external adjustment capabilities is recommended.

Adjustable Current - External Control - “E” Model

Figures 10 and 11 show external adjustment configurations. Both use a 5Kohm, linear taper potentiometer. In

Figure 10, the potentiometer is connected between the internal 5V

reference (Ref) output and the control (Ctrl)

input. When using this configuration, it is important that Vin be 7V

or higher. Figure 11 shows the control

potentiometer being powered by an external 5V

source. When using an external power source for the

potentiometer, the source ground must be common to the LED- output pin. In either configuration, connect the

potentiometer such that clockwise rotation increases the resistance. Note that, because the current through the

potentiometer is less than 5mA, a low power potentiometer may be used.

External On/Off Control

Where a manual on/off control is desired, the potentiometer in Figures 10 and 11 may be replaced by a pushbutton

or toggle switch. The output current will be zero when the switch is closed. Figures 12 and 13 show external

dimming control combined with on/off control. The circuit in Figure 13 uses a 2N3906 or equivalent PNP

switching transistor.

External Pulse/Strobe Control

Figures 14 and 15 show two methods for low speed pulsing or high speed flashing operation. In Figure 14, a

5V TTL/CMOS logic signal is applied directly to the control (Ctrl) input of the 7021/7023. The output current will be

zero when the control signal is high. Note that the input needs to source a minimum of 4.75V

into a 1.5Kohm

input impedance. Also, as is the case with a dc control signal, the logic input ground should to be common to the

LED- output terminal.

Figure 15 shows an inverted input configuration using a 2N3906 or other PNP switching transistor. In this case, a

logic high will cause the output to be "on". In either configuration, the rise time of the output will be 10μsec or

less. A pulse frequency up to 10kHz may be used.

Specifications subject to change without notice. April, 2010 - Rev 2.2

LEDdynamics, Inc.

802.728.4533 P

802.728.3800 F

sales@LUXdrive.com

www.LUXdrive.com

Made

the

USA

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